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70-058 Networking Essentail复习概要

Network Topology  

1. Bus - A bus topology, also called a linear bus, consists of a single cable to which all computers in the segment are attached. The bus's cable is terminated at each end to prevent message transmissions form bouncing back and forth. Requires 50-ohm terminators.
2. Star - In a star topology, all computers on the network are connected to one another using a central hub. Some advantages of the Star topology:
   1. If one computer goes down it will not disable the entire network.
   2. Easier to add computers or reconfigure the network.
3. Ring - Commonly seen in Token Ring and FDDI (Fiber Optic) networks. In a physical ring topology the data line actually forms a logical ring to which all computer are attached. Ring topology uses Token passing. A computer can only send data when it has possession of the token.
4. Star-Ring - Also known as as star-wire ring because the hub it self is wired to the ring. Looks Identical to a star topology on the surface, but the hub is wired as a logical ring. This topology is popular for Token Ring networks because its easier to implement.

Networking Architectures

• FDDI (Fiber Distributed Data Interface) - is a networking standard that uses fiber cable and token-passing medial-access mechanism to create a fast and reliable network. Unlike Token Ring, an FDDI network may have several frames simultaneously circulating on the network. FDDI uses two counter routing rings. All data is transmitted on the primary ring, while the secondary ring provides fault tolerance. FDDI is not suitable for WAN's because the maximum ring length is 100 Kilometers or about 62 miles. You cannot wire tap FDDI like you can Ethernet.

• ARCNet (Attached Resource Computer Network) - ARCnet uses a token-passing method in a logical ring similar to Token Ring network. ARCnet can utilize a star, bus or star-bus topology . It does not use a ring topology. Data transmissions are broadcast throughout the entire network, which is similar to Ethernet. However a token is used to allow computer to speak in turn.  A token is passed to the next-highest numerical station.

• AppleTalk - AppleTalk is networking architecture that is built into every Macintosh computer. The cabling system AppleTalk network is LocalTalk local talk uses a network media-access method called Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA). A LocalTalk network can support up to 32 devices.

Physical Mesh Topologies - Mesh topologies are distinguished by having redundant links between devices which enable data to be sent over several different paths. Reconfiguration, like installation, gets progressively more difficult as the number of devices increases. Most mesh topology networks are not true mesh networks. Rather they are hybrid mesh networks which contain some redundant links, but not all.

• The major advantage of mesh topologies is fault tolerance!!!.
• easy to trouble shoot
• difficult to install and reconfigure
• costly to maintain redundant links

Networking Protocols
Protocols are the agreed-upon way in which computer exchange information.
Microsoft-Supplied Network Protocols

• NetBEUI - Stands for NetBios Extended User Interface. (NetBios stands for Network Basic Input/Output Systems. NetBEUI was developed for workgroups of 2 to 200 computers.
  • Cannot be routed between networks
  • High Speed
  • Can handle 254 sessions
  • Easy to implement
  • Self tuning
  • Small memory overhead
  • Good error correction
• NWLink - NWLink is Microsoft's implementation of Novell's IPX/SPX protocol stack.
  • Easy to setup
  • Supports routing between networks
  • Faster than TCP/IP
  • Slower than NetBEUI
• TCP/IP - Stands for Transmission Control Protocol and Internet Protocol. TCP/IP is a suite of protocols developed by the Department of Defense's Advanced Projects Research Agency. The standard for internetworking UNIX computers.
  • Broad connectivity among all types of computers.
  • Direct access to global computers
  • Strong support for routing
  • SNMP support
  • DHCP support
  • WINS support
  • POP support
  • Allows for centralized domain assignment
  • Difficult to setup
  • Slower than NetBEUI and IPX/SPX

The Protocol Suites or Stack

• Networking protocols - These protocols provide for addressing, routing information, error checking, requesting retransmissions, and establishing rules for communicating.
  • DDP (Delivery Datagram Protocol) AppleTalk's data transport protocol .
  • IP (Internet Protocol) Part of the TCP/IP protocol that provides addressing and routing information.
  • IPX (Internetwork Packet eXchange) and NWLink Novell's NetWare protocol (and Microsoft's implementation of this protocol) used for packet routing and forwarding.

• Transport Protocols - These protocols are responsible for ensuring reliable data delivery. These protocols work at the Transport layer of the OSI model.
  • ATP (Apple Talk Transaction Protocol) AppleTalk's session and data transport protocol.
  • NetBIOS. NetBIOS establishes communication between computers.
  • SPX (Sequenced Packet eXchange) and NWLink Novell's connection-oriented protocol that is used to guarantee data delivery.
  • TCP (Transmission Control Protocol) The portion of the TCP/IP protocol suite that is responsible for reliable delivery of data.
  • NetBEUI Provides for transport services for NetBIOS.

• Application Protocols - These protocols are responsible for application-to-application services.
  • AFP (AppleTalk File Protocol) Apples remote file management protocol.
  • FTP (File Transfer Protocol) Another member of the TCP/IP protocol. Used for transferring files.
  • NCP (NetWare Core Protocol) Novell's client shells and redirectors.
  • SMTP (Simple Mail Transport Protocol) A member of the TCP/IP protocol suite that is responsible for transferring email. If you are integrating your LAN e-mail system with the Internet, you will most likely interface with the Simple Mail Transport Protocol.
  • SNMP (Simple Network Management Protocol) The SNMP is widely used to control network communications devices using TCP/IP. Most network analyzer software can interface to SNMP, and an SNMP monitor is a very useful tool in a network of more than moderate complexity.
  • SMB (Server Message Blocks) defines a series of commands passed from a client machine to a service on a server machine. An SMB usually contains data that is used by a remote device (such as a hard drive controller when accessing remote files).
  • NFS (Sunsoft's PC Network File System)

  Dialup Communication Protocals

Other protocols you may encounter:

• X.25: This protocol is commonly used in wide area communications with multiple communicating devices. It has considerable error checking and overhead. Uses packet assembles and disassembles Originally created to connect dumb terminals to mainframes. TCP/IP has grown much more popular as a wide area networking standard, but you may need to interface to equipment or networks that use this simpler protocol.DLC: IBM uses this protocol to link computers together in its SNA mainframe networks. You may need to use this protocol if you must connect to IBM equipment that does not support a more common network protocol such as TCP/IP.

• X Windows: This is the networked windowing protocol of most UNIX workstations. You may need to use this protocol if you will be connecting desktop computers running client programs to server programs running on UNIX workstations.

• NFS: Many UNIX computers use NFS (Network File System) to share file storage over a TCP/IP network. You may need to use the NFS protocol if you are using a UNIX workstation as a file server or if you need to give your UNIX workstations access to your PC-based file server.

The Theoretical Network

1. Protocols that work together to provide a layer or layers of the OSI model are known as a protocol stack or suite.
2. Networks primarily send small chunks of data called packets.
3. A packet is made up of tree components: the header, data and trailer.
4. The process of moving data from one LAN to another is over one or more paths between LANs are called routing.
5. Several protocols can be bound to the same card.

WAN (Wide Area Network)Technologies & Connectivity

ATM stands for Asynchronous Transfer Mode. ATM is an advanced implementation of packet switching that provides high-speed data transmission rates at about 155Mbps, but theoretically 1.2 gigabits per second is possible. ATM also supports simultaneous voice, video and data transmission.

ISDN (Integrated Services Digital Network) Primary goal was to integrate voice and data services by replacing analog telephone lines with digital equivalents. Can support data throughput as high as 115Kbps including compression. ISDN offers normal throughput of 64Kbps per channel, and most ISDN lines offer normal bandwidth of 128K, because channels are often used in pairs.

Frame Relay - Frame Relay is a packet switch network service that doesn't perform error checking. The error checking will be handled at the either end of the connection. It operates at at speeds between 56Kbps and 1.544Mbps. Customers can specify exactly the amount of bandwidth they want to pay for.

T1 and T3 Lines - The most widely used type of all high speed digital lines. T1 is a point-to-point transmission technology that consists of 24 64kbps channels for a total transmission capability of 1.544 Mbps. Each of the channels my be used as a separate voice or data communication channel. T3 is equivalent of 28 T1 lines and handles a data rate of 44.736 Mbps. It is extremely expensive. T3 lines require fiber optic cables or microwave-transmission equipment. You can lease portions of a T-carrier line's bandwidth though services called Fractional T1 (FT1) and Fractional T3 (FT3).

SONET - Sonet is fiber optic WAN technology used to deliver voice data, and video at speeds of up to 622 Mbps and beyond.

Cabling and Interfaces

Transceiver A can connect a thinnet cable to a thicknet cable. A transceiver cable is also called a drop cable. They can also switch the parallel data stream on a computers bus to a serial data stream used in the cables connection the computers.

Twisted Pair Cable - Twisted pair cable comes in two types Shielded (STP) and Unshielded (UTP). 

• UTP - Cable uses a RJ-45 Connector.
• UTP - is susceptible to crosstalk and interference from and ElectroMagnetic Frequencies (EMF). motors, HVAC units, florescent lights, and telephone ringing equipment.
• STP - STP is most often used on Token Ring networks.

Ethernet uses a data format called frames. They can be between 64 to 1618 bits long. They contain preambles that mark the start of the frame.

Connecting Networks

Connection Oriented Communication - A formal connection between two computers. Reliable
Connectionless oriented connection - Sending data across the network without guaranteeing receipt. fast but Unreliable
Crosstalk - Interference when two wires are laid against each other in parallel.
Attenuation - The degradation or distortion of an electronic signal as it travels from it's destination.

Network Adapter Cards (NIC)

• EISA (32 bit) and Micro Channel are faster than ISA (16 bit) and memory transfer method
• Shared memory is faster than I/O or DMA.
• ARP (Address resolution protocol) cashe is used to map IP address to NIC address.

Designing the Local Area Network

1. If you have fewer than 50 people you will be able to run your network with one server.
2. A network of more than 250 users will most likely be connected together with a high-speed backbone that runs between servers.
3. With more than 1000 users it is best to break down the network into multiple connected networks that have different directory services.
4. Wires that connect computers together in a LAN are sometimes called the physical plant.

Administering A Network

Sector Sparing - is a fault tolerance system also called hot fixing. If bad sectors are found during disk input/output operations, the fault tolerance driver will attempt to move the data to a good sector and map out the bad sector. Only SCSI devices can perform sector sparing. (ESDI and IDE) cannot.

Broadband - Analog signals. The signal flow is unidirectional. Multiple communication channels may be used simultaneously.

Baseband - Digital signal sent over a cable without modulation.

Windows NT & Novell

1. Back end - Server
2. Front end - Client
3. Peer-to-Peer - All computers can act as client and server. This type of network is suited for networks that have 10 or fewer computer. No centralized security.
4. Client/Server - Tasks are divided between the backend (the server) which stores and distributes the data and the front end (the client) which request specific data.
5. SLIP - Cannot provide automatic IP addressing. Dialup communication Protocol
6. PPP - Can provide automatic IP addressing. Dialup communication Protocol
7. User level Security - Passwords are provided on a user-by-user basis. Also provides a higher level of security than share level. Associated with NT and Novell
8. Share Level Security - Security where each resource owner shares a resource and creates a password to control access to its resource. Associated with Window 95 and Window for workgroups 3.11.
9. Password policies can be used to protect sensitive data.
10. A username cannot be the same as any other username or group name on the server or network domain.
11. Viruses are transmitted by bootable floppy disks and executable programs.
12. The program that helps the administrator manage user accounts on a Windows NT Servers is called User Manager for Domains. On NT workstation it's called User Manager.
13. The Windows NT Performance Monitor shows the utilization of system resources.
14. NDIS and Novell's ODI provide a standard for network adapter card drivers to communicate.
15. Redirector - On Netware Networks the redirector determines whether a file request is intended for a local machine or for a remote computer.
16. Open Datalink interface (ODI) is a specification defined by Novell and Apple to support multiple protocols on a single network adapter card. It is similar to NDIS.
17. NDIS allows multiple protocols to used a single network card.
18. The computer name and the shared name are both included in the Universal Name Convention (UNC) \\computer_name\share_name
19. Routing Information Protocol (RIP) is the default protocol NetWare uses for routing. RIP is used to determine the number of hop counts to a destination. A hop count is the number of intermediate routers a packet must cross to reach a particular device. RIP functions at network layer of the OSI model.

Diagnostic Tools

1. Advanced Cable Testers - A cable tester is an instrument used to test the integrity and strength of the cable. A cable tester can run test to determine if there is a cable break. It can also determine the cable's attenuation, resistance, message frame counts, . They can even monitor network for collisions, beaconing, traffic to and from a computer to see if a particular NIC card is is causing a problem. Some can even determine cable type.
2. Time Domain Reflectors (TDR's) - TDR's work by emitting short pulses of know amplitudes that travel down a cable. A TDR analyzes the time delay associated with the resistance signal reflection. It can only detect shorts, breaks, imperfections in the network cable and tell you where they are.
3. Digital Volt Meters (DVM's) - Digital volt meters can help you find a break or a short in a network cable by checking the voltage being carried across a network cable.
4. Protocol Analyzers - A protocol analyzer monitors and logs network activity and provides guidelines for optimizing performance. They can analyze, capture and decode network packets, decode them, determine which components of a network are generating errors or traffic fluctuations and view the contents of a pack. You do not need to shut down the server or routers when trouble shooting problems. They work at the packet level. Also called a network analyzer.

Free test(104)

1.Broadband Transmission uses:

a. Bi-directional Digital signals, a range of frequencies to transmit data and use amplifiers to regenerate the signal.
b. Unidirectional analog signals, a range of frequencies to transmit data and use amplifiers to regenerate the signal.
c. Unidirectional digital signals, a range of frequencies to transmit data and use amplifiers to regenerate the signal.
d. Bi-directional Digital signals, a range of frequencies to transmit data and use repeaters to regenerate the signal.

2. Baseband Transmission uses:

a. Bi-directional Digital signals, a range of frequencies to transmit data and use amplifiers to regenerate the signal.
b. Unidirectional analog signals, a range of frequencies to transmit data and use amplifiers to regenerate the signal.
c. Unidirectional digital signals, a range of frequencies to transmit data and use amplifiers to regenerate the signal.
d. Bi-directional Digital signals, a single frequency to transmit data and use repeaters to regenerate the signal.

3. Project 802 defines standards for which layers of the OSI model?

a. Application and presentation layers.
b. Physical and Data Link layers
c. Network and Data Link layers
d. Transport and Network layers

4. Repeaters are used to:

a. Regenerate analog signals.
b. Regenerate digital signals.
c. Connect UTP to Fiber-Optic cable.
d. Connect ThinNet to Thicknet
e. Isolate broadcast traffic

5.  What is the maximum cable segment length for UTP (10BaseT) Ethernet?

a. 100 meters
b. 185 meters
c. 200 meters
d. 285 meters
e. 355 meters

6.  COM1+ 3 uses:

a. IRQ 2
b. IRQ 3
c. IRQ 4
d. IRQ 5
e. IRQ 6

7. COM2+4 uses:

a. IRQ 2
b. IRQ 3
c. IRQ 4
d. IRQ 6
e. IRQ 7

8. LPT 1 uses:

a. IRQ 2
b. IRQ 3
c. IRQ 4
d. IRQ 6
e. IRQ 7

9. Where do you need to be careful in not providing two equal NETBIOS names?

a. workgroup name
b. computer name
c. domain name
d. share name

10. With which devices can you measure the bandwidth of a new installation site ?

a. Volt meter
b. Network Monitor
c. TDR
d. Oscilloscope

11. Which protocols are routable?

a. XNS
b. OSI
c. IP
d. LAT
e. NetBEUI
f. IPX
g. AppleTalk
h. DECnet.

12. Which of the following examines packets?

a. performance monitor
b. TDR
c. Protocol Analyzer
D. SMPT

13. Which of the following should be used for at least 100mbps?

a. ATM
b. X25
c. 52kbps Digital line
d  X100

14. Which is a feature of Win NT Workstation?

a. Shared resources with passwords
b. User level passwords

15. Which is a feature of Win 95?

a. Shared resources with passwords
b. User level passwords

16. Assume that a user must provide a user name and password to gain access to a network resource. Different levels of access privileges are assigned, depending on the user. Which kind of network security is this an example of?

a. Share-level security
b. Partial-access security
c. User-level security
d. Password security

17. Why does a high number of broadcast messages adversely affect overall network performance?

a. Each broadcast message requires an acknowledgement packet from every computer on the network
b. No computer on the network can transmit data until each broadcast message has been acknowledged by every computer on the network
c. Broadcast messages are automatically routed to every segment of a LAN
d. Every computer on the network must process each broadcast message

18. Which layer of the OSI model are managed by a network protocol such as Microsoft NetBEUI?

a. Network
b. Physical
c. Transport
e. Media access control

19. Your company uses both Ethernet and token-ring LAN in the same building. Users need access to resources and the ability to transmit data between the LAN's. Which device would you use to enable communications between dissimilar LAN's that use different protocols?

a. Bridge
b. Router
c. Gateway
d. Repeater

20. What device works at the MAC sub-layer of Data Link layer of the OSI Model?

a. Bridge
b. Router
c. Gateway
d. Repeater

21. What is the purpose of the token in a network that employs a media access control method on the IEEE 802.5 specification?

a. Token passing provides higher throughput than CSMA/CD when using twisted-pair wiring.
b. The station that holds the token is allowed to transmit a message on the network
c. The station that holds the token has the highest priority on the network
d. A token contains information that is used to route messages between rings

22. What does the MAC driver do?

a. It defines how data should be presented to the next receiving layer, packages the data accordingly, and then passes data to the application through the session layer interface.

b. It provides low-level access to network adapters by providing data transmission support and some basic adapter management functions.

c. It supports communication between applications on different computers by creating sessions, defining data-exchange formats, and providing application-support services.

d. It is responsible for establishing logical names on the network, establishing connections between two logical names on the network, and supporting reliable data transfer between computers that have established a session.

23. You have been given the task of installing cables for an Ethernet network in your office. The building is an older one, and you have limited workspace. In addition, the network cable will have to share the existing conduit with telephone cable, and cable segments will be up to 100 meters in length. Which cable is best suited to this installation?

a. Fiber-optic
b. Category 1 UTP
c. Category 3 UTP
d. Thicknet coaxial

24. What is the minimum category of UTP cable required to meet Ethernet 10BaseT standard?

a. Category 1
b. Category 2
c. Category 3
d. Category 5

25. Which of the following can not be duplicated when using NetBIOS?

a. Workgroup name
b. Domain name
c. Computer name
d. Share name

26. What does the transport protocol do?

a. It defines how data should be presented to the next receiving layer, packages the data accordingly, ad then passes data to the application though the session layer interface.

b. It provides low-level access to network adapters by providing data transmission support and some basic adapter management functions

c. It supports communications between applications on different computers by creating sessions, defining data-exchange formats, and providing application-support services

d. It is responsible for establishing logical names on the network, establishing connections between two logical names on the network, and supporting reliable data transfer between computers that have established a session

27. Which of the following supports compression and error control?

a. PPP
b. SLIP
c. DLC
d.SMPT

28. Your company has decided to implement a WAN in the near future. You are required to design a Net BIOS naming scheme. At the present time your company consist of:

20,000 Computers using TCP/IP
850 Servers using Windows NT & NetWare
2500 HP LaserJet printers
Each employee has their own e-mail address

Required result:
The naming scheme should work after the company implements the WAN.

Optional desired results:
Naming scheme should show department, location and define the user.

Proposed solution:
Implement a 16 characters NetBIOS naming scheme. The first 6 characters would show the department, 5 characters would show the location, and the other 5 characters will have part of the e-mail address for each user.

a. The proposed solution produces the required result and produces both of the optional desired results.
b. The proposed solution produces the required result and produces only 1 of the optional desired results.
c. The proposed solution produces the required result but does not produce any of the optional desired results.
d. The proposed solution does not produce the required result.

29. Your company is implementing a WAN. You want to connect three locations in Atlanta, New York and Los Angeles.

Required results:
They need to have communication of at least 1 Mbps at all times.

Desired optional results:
They need to have continued communication between all cities at 1 Mbps even if one line breaks.

Proposed solution:
Connect a T1 line between New York and Los Angeles and Los Angeles and Atlanta.

a. The proposed solution produces the required result and produces both of the optional desired results.
b. The proposed solution produces the required result and produces only 1 of the optional desired results.
c. The proposed solution produces the required result but does not produce any of the optional desired results.
d. The proposed solution does not produce the required result

30. Your company is implementing a WAN. You want to connect three locations in Atlanta, New York and Los Angeles. 

Required results:
They need to have communication of at least 1 Mbps at all times.

Desired optional results:
They need to have continued communication between all cities at 1 Mbps even if one line breaks.

Proposed solution:
Connect 3 T1 lines between each of the three cities.

a. The proposed solution produces the required result and produces both of the optional desired results.
b. The proposed solution produces the required result and produces only 1 of the optional desired results.
c. The proposed solution produces the required result but does not produce any of the optional desired results.
d. The proposed solution does not produce the required result.

31. You have a network with MS-DOS clients and Unix clients. Recently, an NT server is added to the network. Now the Unix machines can access all shared resources except those on the NT server. why?

a. protocol mismatch between server and Unix clients
b. incorrect binding order of protocols on the server

 32. You have a network in which network utilization has increased from 30% to 70% in one year. You plan to add another server and 30 clients within 12 months.

Required Result:
Reduce network utilization by 50%

Optional results:
allow for future expansion
minimize costs
maintain network utilization at its present lower level

Proposed solution:
Change the packet size from 1514 bytes to 576 bytes and increase the TCP window from 4096 bytes to 16384 bytes

a. The proposed solution produces the required result and produces both of the optional desired results.
b. The proposed solution produces the required result and produces only 1 of the optional desired results.
c. The proposed solution produces the required result but does not produce any of the optional desired results.
d. The proposed solution does not produce the required result.

33. You're network has started to slow down. You run performance monitor and it shows the following: 

%processor time = 8 (average)
%pagefaults/sec = 2 (average)
%disk_time=25 (average)

Based on this, what should to restore performance.

a. add more ram
b. introduce disk striping with parity
c. get multiprocessor system
d. segment the network

34. You've got 'x' number of servers and PC's using a mixture of routable and non-routable protocols including TCP/IP, SPX/IPX and NetBEUI. You've got 4 brouters. And the network performance is being seriously compromised by network broadcast traffic.

Required:
Cut broadcast traffic by 50%

Optional Desired Results:
keep costs to a minimum
allow for further expansion

Proposed Solution:
Convert all the computers to NWLink and disable the bridging

a. The proposed solution produces the required result and produces both of the optional desired results.
b. The proposed solution produces the required result and produces only 1 of the optional desired results.
c. The proposed solution produces the required result but does not produce any of the optional desired results.
d. The proposed solution does not produce the required result.

35. You have 750 computers on an IPX network, one NT server, and all the rest are win95 clients. You want to MINIMIZE the amount of administration, what do you use:

a. Peer-peer
b. User level.

36. Which WAN transmission will support any available transmission speed?

a. Frame relay
b. ATM

37. What WAN link transmits voice, data and video?

a. ATM
b. RAS
c. T1
d. ISDN

38. What is a characteristic of assured delivery?

a. Connection Oriented
b. Connection-less Oriented

39. You have a 486 computer using COM1, COM2, LPT1, and VGA. NIC is set for IRQ 3, I/O Base 300. Which one is conflicting with the NIC?

a. COM1
b. COM2
c. LPT1
d. VGA

40. Your network is using multiple protocols (AppleTalk, NetBEUI, TCP/IP, NWLink,...) for MACS, NetWare, Unix, PCs. There is excessive network traffic and poor performance. How can you reduce network traffic and improve performance. Choose only one protocol for the network. There should be minimal degradation of machine functionality as a result of the protocol change.

a. AppleTalk
b. NetBEUI
c. TCP/IP
d. NWLink

41. What resource can you use to check hubs, routers, and bridges on your network?

a. SNMP
b. TDR
c. Network Monitor 

42. Which Operating Systems support share-level access?

a. Windows for Workgroups
b. Windows 95
c. Win NT Workstation
d. Win NT Server

43. Tom can log on to the network but cannot connect to a server on another segment using that server's NetBIOS name. What is wrong?

a. Tom's computer is not registered in the WINS server
b. The remote server is not registered in the WINS server.

44. What is the name of the unique identifier encoded in the NIC?

a. MAC address
b. IP address.

45. Your network cannot be down if one hard disk fails. What kind of fault-tolerance can you implement with a limited budget.

a. RAID level 5 (disk striping w/parity)
b. Disk duplexing
c. Backup server

46. You come in Monday morning and find that all computers on one segment of the network are having problems communicating. You suspect that it is caused by a broadcast storm. You have determined that it is not a hardware problem. What is your first action to resolve the problem? Choices as best as I remember were:

a. disconnect all routers
b. Power down and restart the server
c. Use a TDR to analyze the problem
d. Use a Network Analyzer to determine the source of the storm

47. You have offices in Atlanta, New York, and LA You want to connect the 3 offices in a WAN.

 Required result: They must have communication of at least 1 Mbps

 Optional desired result: They must be able to communicate at 1 Mbps even if one link fails.

Solution: Install 2 T1 links (New York to Atlanta, Atlanta to LA)
Install dial-up connections of 28.8 Kbps between all 3 sites.

a. The proposed solution produces the required result and produces the optional desired result.
b. The proposed solution produces the required result but does not produce optional desired result.
c. The proposed solution does not produce the required result.

48. You have offices in Atlanta, New York, and LA You want to connect the 3 offices in a WAN.

Required result: They must have communication of at least 1 Mbps

Optional desired result: They must be able to communicate at 1 Mbps even if one link fails.

Solution: put a RAS server at each site and have 6 28.8 Kbps lines going between all 3 sites.

a. The proposed solution produces the required result and produces the optional desired result.
b. The proposed solution produces the required result but does not produce optional desired result.
c. The proposed solution does not produce the required result.

49. You have a number of computers in a 10Base2 network and it has reached 70% of capacity. You will be adding some more computers later.

Required result: Increase speed by 50% and reduce % of capacity to ? (I think 30).

Optional desired results: Maintain the level of operation after adding the additional computers and Minimal change to operation

 Solution: Install fiber optic cable and FDDI adapters

a. The proposed solution produces the required result and produces the optional desired result.
b. The proposed solution produces the required result but does not produce optional desired result.
c. The proposed solution does not produce the required result.

50. What do you use for measuring network performance over long period of time?

a. Time domain reflectometer
b. Protocol Analyzer
c. Logging with Performance Monitor

51. Which of the following would you use if you wanted a safe dialup connection?

a. SLIP
b. PPP

52. Which of the following supports compression and error control?

a. PPP
b. SLIP

53. What OSI level does a router work at?

a. Application Layer
b. Presentation Layer
c. Session Layer
d. Transport Layer
e. Network Layer
f. Data Link Layer
g. Physical Layer

54. What OSI level does a gateway work at?

a. Application Layer
b. Presentation Layer
c. Session Layer
d. Transport Layer
e. Network Layer
f. Data Link Layer
g. Physical Layer

55. What OSI level does a bridge work at?

a. Application Layer
b. Presentation Layer
c. Session Layer
d. Transport Layer
e. Network Layer
f. Data Link Layer
g. Physical Layer

56. One of the workers in the company complained that her computer is slow. What should you do to isolate this problem?

a. Use network monitor to monitor the network
b. Shut down all routers in that segment
c. Shut down the server in that segment of the network.

57. Which connectivity device works above the transport layer?

a. repeater
b. bridge
c. router
d. gateway
e. brouter

58. You need to run Twisted Pair Cat5 180m. What would you need?

a. repeater
b. bridge
c. router
d. gateway
e. brouter

59. What do you use to create a segmented LAN?

a. repeater
b. bridge
c. router
d. gateway
e. brouter

60. You have an 200 node LAN using TCP/IP, and you want to segment it into 3 sub-nets. What do you use?

a. repeater
b. bridge
c. router
d. gateway
e. brouter.

61. What connectivity device works at the physical layer of the OSI model?

a. repeater
b. bridge
c. router
d. gateway
e. brouter.

62. You have an 200 node LAN using TCP/IP and NetBEUI and after you segment it into 3 subnets it is still able to use both protocols. What do you use?

a. repeater
b. bridge
c. router
d. gateway
e. brouter.

63. What do you use to connect a Ethernet LAN to IBM mainframe?

a. repeater
b. bridge
c. router
d. gateway
e. brouter

64. Two of your clients encounter problems accessing the network most of the time. All others have the same problem occasionally. You have 2 networks together using TCP/IP & NetBEUI protocols. The cables you are using are RG-58 A/U and RG 58 U.

After running diagnostics you get the following readings:

CABLE reads INFINITY
BNC T connectors read INFINITY

What would you do?

a. Replace all BNC T connectors.
b. Replace all 16 bit network cards with 32 bit.
c. Replace all RG-58 A/U cable with RG-58 U.
d. Set the transceiver settings to the manufacturer defaults.

65. A company has 120 computers, with Windows 95 and Windows for Workgroups and has a problem with employee turnover. You implement:

a. User-level security
b. share-level with passwords for resources.

66. Configurations for 2 NICs on your network are identical, why can't they participate in the network?

a. Base I/O conflict
b. IRQ conflict
c. Incorrect frame type
d. MAC address conflict.

67. You want to implement a WAN and you want to use the fastest transfer speed, What do you use?

a. T1
b. ATM
c. Switched 56k
d. ISDN

68. You test your RG-58 cable and get the following readings:

end 0 to infinity
t-connector infinity
terminator 50

a. replace terminator with a 75 ohm terminator
b. replace the cable
c. replace the t-connector

69. Which WAN link will provide increased bandwidth as needed?

a. X.25
b. Frame Relay
c. DLC
d. ATM

70. What would be used to connect two twisted pair category 5 wiring cable lengths into a 180 meter run?

a. repeater
b. bridge
c. router
d. gateway
e. brouter

71. What device is used to segment a LAN to isolate network traffic?

a. repeater
b. bridge
c. router
d. gateway
e. brouter

72. Which of the following should be used for at least 100mbps?

a. X25
b. 52kbps
c. Digital line [ATM]

73. Assume that a user must provide a user name and password to gain access to a network resource. Different levels of access privileges are assigned, depending on the user. Which kind of network security is this an example of?

a. Share-level security
b. Partial-access security
c. User-level security
d. Password security

74. Which layers of the OSI model are managed by a network protocol such as Microsoft NetBEUI?

a. Network and transport
b. Physical and data link
c. Transport and session
d. Media access control and logical link control

75. Your company uses both Ethernet and token-ring LAN in the same building. Users need access to resources and the ability to transmit data between the LAN's. Which device would you use to enable communications between dissimilar LANs that use different protocols?

a. Bridge
b. Router
c. Gateway
d. Repeater

76. What is the purpose of the token in a network that employs a media access control method on the IEEE 802.5 specification?

a. Token passing provides higher throughput than CSMA/CD when using twisted-pair wiring.
b. The station that holds the token is allowed to transmit a message on the network
c. The station that holds the token has the highest priority on the network
d. A token contains information that is used to route messages between rings

77. Which of the following will support a WAN link of 100Mbps?

a. Frame Relay
b. T1
c. -X.25
d. Frame Relay
e. ATM

78. Which limitation are NDIS and Novell ODI designed to overcome?

a. The need to dynamically bind a single protocol to multiple MAC drivers in order to support more than one network operating system.

b. The need for proprietary network interface drivers for each network operating system and protocol.

c. Monolithic protocols do not conform to the OSI model

d. Monolithic protocols cannot be loaded into the upper memory area

79. What does the MAC driver do?

 a. It defines how data should be presented to the next receiving layer, packages the data accordingly, and then passes data to the application through the session layer interface.

 b. It provides low-level access to network adapters by providing data transmission support and some basic adapter management functions.

 c. It supports communication between applications on different computers by creating sessions, defining data-exchange formats, and providing application-support services

 d. It is responsible for establishing logical names on the network, establishing connectionsbetween two logical names on the network, and supporting reliable data transfer between computers that have established a session

80. You have been given the task of installing cables for an Ethernet network in your office. The building is an older one, and you have limited workspace. In addition, the network cable will have to share the existing conduit with telephone cable, and cable segments will be up to 135 meters in length. Which cable is best suited to this installation?

a. Fiber-optic
b. Category 1 UTP
c. Category 3 UTP
e. Thicknet coaxial

81. What is the minimum category of UTP cable required to meet Ethernet 10BaseT standard?

a. Category 1
b. Category 2
c. Category 3
e. Category 5

82. You have two networks, one uses NetBEUI and ones uses NWLink. Which device is required so that these networks can communicate?

a. Router
b. Brouter
c. Bridge
d. Repeater

83. What does the transport protocol do?

a. It defines how data should be presented to the next receiving layer, packages the data accordingly, and then passes data to the application though the session layer interface.

b. It provides low-level access to network adapters by providing data transmission support and some basic adapter management functions.

c. It supports communications between applications on different computers by creating sessions, defining data-exchange formats, and providing application-support services.

d. It is responsible for establishing logical names on the network, establishing connections between two logical names on the network, and supporting reliable data transfer between computers that have established a session.

84. What protocol counts hops from router to router to find the shortest path?

a. DHCP
b. RIP
c. SNMP
d. IP
e. DLC

85. Which WAN link will provide increased bandwidth as needed?

a. X.25
b. Frame Relay
c. DLC
d. ATM

86. Which connectivity device works at the network layer and is capable of selecting multiple data paths?

a. Bridge
b. Repeater
c. Router
d. Hub

87. What do you need to know to copy a shared file from one computer to another?

a. Workgroup name
b. Share name
c. Domain name
d. Computer name

88. What is a characteristics of IEEE 802.3 10Base2 specification?

a. UTP
b. RG-62
c. BNC T Connector
d. RJ 45

89. Tom attempts to log onto the system and he is unsuccessful because he cannot get an IP address. Which dial-up protocol is Tom using?

a. PPP
b. SLIP

90. From the following, choose a WAN link of 100Mbps.

a. T1
b. ATM
c. X.25
d. Frame Relay

91. What is a characteristic of IEEE 802.3 10BaseT specification?

a. RJ-11
b. BNC T connector
c. UTP
d. Coaxial cable

92. EXHIBIT

                        O
                       X-|
                           |

O-X--------------------|-----------------------X-O (Grounded)

RG-58 A/U Cable

O=50 ohm Terminator
X=Computer

The company is having problems with their network. They have problems with attenuation. What would you do to solve the problem?

a. Change the 50 ohm terminators to 25 ohm
b. Ground one of the other terminators
c. Rearrange the cables so there are only two terminators
d. Add a repeater

93. EXHIBIT

O-X---------------X-----------------X---------------X-O
+                                                         +

O=50 ohm Terminator
+=Ground
X=Computer

 The company is using 10Base2, RG-58 A/U cabling for a bus topology in one of their classrooms. The computers are receiving garbage information. They have hired you to fix the problem. What would you do?

a. Replace all the cable with RG-58 /U
b. Ground the terminators properly
c. Change terminators to 25 ohms
d. Add a repeater to boost the signal

94. You have set up two computers to connect into the network. All components IRQ's are set to default value. You have set up both network cards with the following:

MAC address = 0114AS558957
IRQ = 5
I/O Base Address = 300

The computers are not able to communicate on the network. What should you do?

a. Change IRQ5 to IRQ3
b. Change MAC address to manufacturers default
c. Change I/O Base address to 320
d. Check for loose connections

95. You have an Ethernet network and a Token Ring network connected by a bridge. When you send a file from the Token Ring network to the Ethernet network, it takes 2 minutes. When you send the same file from the Ethernet network to the Token Ring network it takes 30 seconds. What could be the cause of the problem?

a. The Ethernet packet size is larger than the Token Ring packet size.
b. The Token Ring packet size is larger than the Ethernet packet size.

96. You can successfully ping a server using it's IP address, but you cannot send it a message using it's NetBIOS name. What is the possible problem?

a. The server's name is not registered in the WINS server.
b. Your station's name is not registered in the WINS server.

97. You are installing a new network. You want an inexpensive way to provide 100Mbps. What should you use?

a. Category 5 UTP cable
b. Category 4 UTP cable
c. Category 3 UTP cable 

98. Your company has decided to implement a WAN in the near future. You are required to design a Net BIOS naming scheme. At the present time your company consist of:

20,000 Computers using TCP/IP
850 Servers using Windows NT & NetWare
2500 HP LaserJet printers
Each employee has their own e-mail address

Required result:
The naming scheme should work after the company implements the WAN.

Optional desired results:
Naming scheme should show department, location and define the user.

Proposed solution:
Implement a 15 characters NetBIOS naming scheme. The first 5 characters would show the department, 5 characters would show the location, and the other 5 characters will have part of the e-mail address for each user.

a. The proposed solution produces the required result and produces both of the optional desired results.
b. The proposed solution produces the required result and produces only 1 of the optional desired results.
c. The proposed solution produces the required result but does not produce any of the optional desired results.
d. The proposed solution does not produce the required result.

99. In a system that uses a client-server application, what does the server do ?

a. The server fills requests from the client computer for data and processing resources.
b. The server stores data for the client, but all data processing occurs on the client computer.
c. The client stores data for the server, but all data processing occurs on the server computer.
c. The server stores data and performs all of the data processing, the client performs as a display device.

100. What is the maximum cable segment length for thinnet Ethernet?

a. 100 meters
b. 185 meters
c. 200 meters
d. 285 meters
e. 355 meters

d