Review and Test Yourself


The following sections provide you with the opportunity to review what you learned in this chapter and to test yourself.

The Facts

For the exam, don't forget these important concepts:

  • When presented with a troubleshooting scenario, consider the following procedure:

    1.

    Identify the symptoms and potential causes.

    2.

    Identify the affected area.

    3.

    Establish what has changed.

    4.

    Select the most probable cause.

    5.

    Implement an action plan and solution including potential effects.

    6.

    Test the result.

    7.

    Identify the results and effects of the solution.

    8.

    Document the solution and process.

  • The central device, hubs or switches, provides a single point of failure.

  • Hubs and switches provide LEDs that provide information regarding the port status.

  • A physical ring topology uses a single length of cable interconnecting all computers and forming a loop. If there is a break in the cable, all systems on the network will be unable to access the network.

  • The MSAU on a logical ring topology represents a single point of failure. If all devices are unable to access the network, it might be that the MSAU is faulty.

  • Verify that the cabling and connectors meet the correct specifications.

  • All NICs on the ring network must operate at the same speed.

  • When connecting MSAUs in a ring network, ensure that the ring in and ring out configuration is properly set.

  • A bus topology must be continuous. A break in the cable at any point will render the entire segment unusable.

  • The cable used on a bus network has two distinct physical endpoints.

  • The addition, removal, or failure of a device on the network might prevent the entire network from functioning.

  • Some types of wireless communications require a point-to-point direct line-of-sight connection. If something is blocking this line of sight such as a building, the transmissions might fail.

Key Terms

  • Topology

  • Bus

  • Star

  • Ring

  • Mesh

  • Wireless

  • Protocol

  • Authentication

  • Media

  • Interference

  • Attenuation

  • EMI

  • Segment

  • NetBEUI

  • Hub

  • Switch

  • MSAU

  • Termination

  • SSID

  • WEP

  • AP

Exam Prep Questions

1:

Which of the following should you consider when troubleshooting wiring problems? (Choose the three best answers.)

  • A. The distance between devices

  • B. Interference

  • C. Atmospheric conditions

  • D. Connectors

2:

A user calls you complaining that he is unable to access an application that he uses for accounting. The application runs on the local computer, but the data files are stored on a remote Windows 2000 file server. The network uses TCP/IP and a DHCP server. What is your next step in the troubleshooting process?

  • A. Check the server logs.

  • B. Verify that the user is logged on correctly.

  • C. Log on to the system using the administration account.

  • D. Gather more information from the user.

3:

You have just configured a wireless connection using the Bluetooth standard. At what speed does Bluetooth operate?

  • A. 350Mbps

  • B. 720Kbps

  • C. 200Kbps

  • D. 11Mbps

4:

You are troubleshooting a problem with a bus topology network. Users are reporting that they are sometimes unable to access the network, but it is fine at other times. Which of the following might you consider? (Choose the two best answers.)

  • A. Faulty hubs or switch

  • B. Improper or faulty termination

  • C. Improper grounding

  • D. Cable lengths in excess of 100 meters

5:

Which of the following technologies provides simple password arrangement between wireless base stations and clients.

  • A. WEP

  • B. SSID

  • C. PPP

  • D. PPTP

6:

You have just purchased a new wireless access point that uses no WEP security by default. You change the security settings to use 128-bit encryption. How must the client systems be configured?

  • A. All client systems must be set to 128-bit encryption.

  • B. The client system will inherit security settings from the WEP.

  • C. WEP does not support 128-bit encryption.

  • D. The client WEP settings have to be set to 'auto detect.'

7:

You are troubleshooting a network problem. The network is a star topology. There are four segments on the network: sales, marketing, admin, and research. Several users from the admin department call you reporting problems accessing the server. Where are you most likely to look for the source of the problem?

  • A. The users' workstations

  • B. The server

  • C. The switch that services the admin segment

  • D. The switch that services the sales segment

8:

You are adding a new system to a network that uses a physical ring topology. Which of the following statements is true?

  • A. All network users will not be affected by the addition of the new system.

  • B. The network will be unavailable while the new system is added.

  • C. As long as there is a port available in the MSAU, network users will not be disrupted.

  • D. The MSAU will need to be powered down during the installation, affecting only the users connected to that particular MSAU.

9:

A user calls to inform you that she is unable to print. Upon questioning her, you determine that the user has just been moved from the second floor to the third floor. The user connects to the printer via a wireless router on the first floor. You need to allow the user to print but do not want to purchase another WAP or disrupt other wireless users. Which of the following might you do?

  • A. Move the WAP to allow the client system to access the network and therefore the printer.

  • B. Search for RF interference on the 2.4GHz range.

  • C. Change the channel.

  • D. Configure an RF repeater to forward the wireless communications.

10:

Which of the following wireless standards specifies an RF of 5Ghz?

  • A. 802.11a

  • B. 802.11b

  • C. 802.11g

  • D. 802.11t

Answers to Exam Prep Questions

A1:

The correct answers are A, B, and D. When you're troubleshooting a wiring problem, you should consider the distance between devices, interference such as crosstalk and EMI, and the connection points. Answer C is not correct because bound media (that is, cables) are not affected by atmospheric conditions.

A2:

The correct answer is D. Before implementing a solution to a problem, it is a troubleshooting best practice to first identify what has changed. In this scenario, the administrator would need to gather more information from the user to help isolate the problem and determine why he cannot access the accounting program. Although all of the answers provided can also be performed, they would typically be done after gathering more information from the user.

A3:

The correct answer is B. Bluetooth is a wireless standard commonly used to interconnect peripheral devices to the computer system. Bluetooth operates at 720Kbps.

A4:

The correct answers are B and C. A bus network must have a terminator at each physical end of the bus. It must also be grounded at one end. Improper grounding or faulty termination can lead to random network problems such as those described. Answer A is not correct because 10BASE-2 networks do not use hubs or switches. 10BASE-2 has a maximum cable length of 185 meters; therefore, answer D is not valid either.

A5:

The correct answer is B. The Service Set Identifier is a name assigned to a wireless Wi-Fi network. All devices connected to an AP must use the same SSID name, which is a text string up to 32 bytes long, in order to communicate.

A6:

The correct answer is A. On a wireless connection between an access point and the client, they must be configured to use the same WEP security settings. In this case, they must both be configured to use 128-bit encryption.

A7:

The correct answer is C. In this scenario, the common denominator is that all of the users reporting a problem are connected to the same network switch. Therefore, this would be the first place to look for a problem. Because there is more than one user with a problem, looking at their workstations is not the best troubleshooting step. Because you have not received any other calls from other departments, it is unlikely that there is a problem with the server. Because no users from the sales dept. have reported a problem, there is unlikely to be a problem with the sales section of the network.

A8:

The correct answer is B. A physical ring topology uses a length of cable to form the ring function. A single break in this cable will take the entire network offline. To add a new system to a physical ring network, the ring must be broken. Therefore, the addition of the new client system will affect all network users.

A9:

The correct answer is D. By the description, it sounds like the client has moved beyond the reach of the WAP. To try to accommodate the client, an RF repeater could be used to duplicate and forward the wireless signal. It would not be wise to move the wireless access point, as the move might put it out of reach for other network users.

A10:

The correct answer is A. The 802.11a wireless standard uses the 5GHz frequency range. 802.11b/g uses the 2.4GHz range.



    Network+ Exam Cram 2
    Network+ Exam Cram 2
    ISBN: 078974905X
    EAN: N/A
    Year: 2003
    Pages: 194

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