CCNAv7 Module 12 Quiz – Network Troubleshooting Answers

1. Which statement describes the physical topology for a LAN?

  • It depicts the addressing scheme that is employed in the LAN.
  • It describes whether the LAN is a broadcast or token-passing network.
  • It defines how hosts and network devices connect to the LAN.
  • It shows the order in which hosts access the network.
Explanation: A physical topology defines the way in which computers and other network devices are connected to a network.

2. A network engineer is troubleshooting a network problem where users cannot access the FTP server at the same IP address where a website can be successfully accessed. Which troubleshooting method would be the best to apply in this case?

  • comparing IP settings on user workstations
  • top-down
  • bottom-up
  • divide-and-conquer
Explanation: The fact that some application layer services provided by a network device are operating successfully but others are not means that the lower OSI or TCP/IP layers are functional with the problem likely to be in the application layer.

3. A computer technician performed a number of actions to correct a problem. Some actions did not solve the problem, but eventually a solution was found. What should be documented?

  • everything that was done to try to solve the problem
  • only the solution, because this solved the problem
  • a description of the problem and solution
  • only the failed attempts, so that future technicians will know what not to try
Explanation: Everything that was done to solve a problem should be documented, including failed attempts and the eventual solution. A description of the problem would have been previously documented.

4. A network engineer is troubleshooting a network problem and can successfully ping between two devices. However, Telnet between the same two devices does not work. Which OSI layers should the administrator investigate next?

  • all of the layers
  • from the network layer to the application layer
  • from the network layer to the physical layer
  • only the network layer
Explanation: A successful ping indicates that everything is working on the physical, data link, and network layer. All of the other layers should be investigated.

5. While designing changes to a data center because of a new IoE implementation, a network administrator has the job of diagramming the new physical topology of the area. What should be included in the physical topology diagram?

  • technical specifications of firewalls
  • the service level agreement from the ISP
  • cable locations and lengths between servers and switches
  • the IP addressing scheme for all workstations in the company
Explanation: A physical topology diagram should document the locations of physical devices and their connections.

6. A network technician is troubleshooting an email connection problem. Which question to the end-user will provide clear information to better define the problem?

  • What kind of equipment are you using to send emails?
  • How big are the emails you tried to send?
  • Is your email working now?
  • When did you first notice your email problem?
Explanation: To efficiently establish exactly when the user first experienced email problems, an open-ended question should be asked so that the user can state the day and time that the problem was first noticed. Closed questions only require a yes or no answer which will require further questions to determine the actual time of the problem.

7. Which troubleshooting tool can be used to pinpoint the distance to a break in a network cable?

  • network analyzer
  • network analysis module
  • cable tester
  • digital multimeter
Explanation: Cable testers that include time-domain reflectometers (TDRs) can be used to find the location of breaks in cables by sending signals along the cable and waiting for them to be reflected back.

8. Which troubleshooting software is an example of a network management system tool?

  • LANsurveyor
  • CyberGauge
  • WhatsUp Gold
  • Wireshark
Explanation: WhatsUp Gold is a network management system tool. Both LANsurveyor and CyberGauge are baselining tool. Wireshark is a protocol analyzer.

9. What is the purpose of establishing a network baseline?

  • to document and analyze the network traffic
  • to help monitor and troubleshoot network performance
  • to provide an inventory of network devices
  • to verify the configuration of routers and switches on the network
Explanation: Establishing a network baseline is a tool for monitoring and troubleshooting network performance. A network baseline is a record of normal network performance over time. The performance information (or snapshot) is taken at regular and pre-determined intervals. During monitoring and troubleshooting, the current performance can be compared with the baseline in order to identify the anomalies.

10. After which step in the network troubleshooting process would one of the layered troubleshooting methods be used?

  • determining ownership
  • narrowing the scope
  • documenting symptoms
  • gathering symptoms from suspect devices
Explanation: A layered troubleshooting approach (top-down, bottom-up, or divide-and-conquer) is used to gather hardware and software symptoms from the suspect devices.

11. A company is setting up a web site with SSL technology to protect the authentication credentials required to access the web site. A network engineer needs to verify that the setup is correct and that the authentication is indeed encrypted. Which tool should be used?

  • fault-management tool
  • baselining tool
  • protocol analyzer
  • cable analyzer
Explanation: To verify that the authentication is indeed encrypted, the authentication process needs to be captured and investigated, which can be accomplished through a protocol analyzer, such as Wireshark. A baselining tool is used for automating the network documentation and baselining process. A fault-management tool is used to manage the fault tolerance of network devices . A cable analyzer is used to test and certify copper and fiber cables for different services and standards.

12. When should a network performance baseline be measured?

  • immediately after the main network devices restarted
  • during normal work hours of an organization
  • after normal work hours to reduce possible interruptions
  • when a denial of service attack to the network is detected and blocked
Explanation: The purpose of a network performance baseline is to record the characteristics of a network during normal operations. This can be used as a standard to determine when a network is performing abnormally. Measurements that are performed during particular circumstances (such as main network device restart or after working hours) will result in an inaccurate set of characteristics for the purpose of a baseline. A DoS attack might cause abnormal network performance, but once it is blocked, network performance should return to normal, so there is no immediate need to measure performance in order to establish a baseline.

13. A networked PC is having trouble accessing the Internet, but can print to a local printer and ping other computers in the area. Other computers on the same network are not having any issues. What is the problem?

  • The default gateway router does not have a default route.
  • The switch port to which the PC connects has an incorrect VLAN configured.
  • The PC has a missing or incorrect default gateway.
  • The link between the switch to which the PC connects and the default gateway router is down.
Explanation: Since other computers on the same network work properly, the default gateway router has a default route and the link between the workgroup switch and the router works. An incorrectly configured switch port VLAN would not cause these symptoms.

14. A technician installed a network adapter in a computer and wants to test network connectivity. The ping command can receive responses from workstations on the same subnet but not from remote workstations. What could be causing the problem?

  • The operating system is not compatible with the remote sites.
  • The TCP/IP protocol stack is not loaded.
  • The default gateway is incorrect.
  • The NIC driver is out of date.
Explanation: The default gateway is the interface IP address of the router that is connected to the local network. The function of the router is to enable communication among different networks. If the default gateway is not set or is incorrect, packets that are destined to other networks will not be able to reach the router, and hence there will be no communication to hosts that are located in other networks.

15. What network troubleshooting capability is provided by a cable analyzer?

  • testing and certifying of copper and fiber cables
  • generating reports on traffic that is consuming critical network resources
  • measuring electrical values of voltage, current, and resistance
  • discovering VLAN configuration and viewing switch interface details
Explanation: Cable analyzers are multifunctional handheld devices that are used to test and certify copper and fiber cables for different services and standards.

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