CCNA 4 Chapter 9 V6.0 Answers

1. A user in a large office calls technical support to complain that a PC has suddenly lost connectivity to the network. The technician asks the caller to talk to nearby users to see if other machines are affected. The caller reports that several immediate neighbors in the same department have a similar problem and that they cannot ping each other. Those who are seated in other departments have connectivity. What should the technician check as the first step in troubleshooting the issue?

The trunks between switches in the wiring closet

the cable that connects the PC of the caller to the network jack

the cable connection between a PC and a network outlet that is used by a neighbor

the power outlet to the PC that is used by the caller

the status of the departmental workgroup switch in the wiring closet


2. Users report that the new web site cannot be accessed. The helpdesk technician checks and verifies that the web site can be accessed with Which layer in the TCP/IP model is involved in troubleshooting this issue?


network access




3. Refer to the exhibit. Which two statements describe the results of entering these commands? (Choose two.)

Which two statements describe the results of entering these commands?

The syslog server has the IPv4 address

R1 will send system messages of levels 0 (emergencies) to level 4 (warnings) to a server.

R1 will reset all the warnings to clear the log.

R1 will not send critical system messages to the server until the command debug all is entered.

R1 will output the system messages to the local RAM.


4. Match the troubleshooting tool to the correct category. (Not all options are used.)

Match the troubleshooting tool to the correct category

Place the options in the following order:

[+] CiscoView

[+] What’s Up Gold

[+] HP OpenviewBTO

[#] SolarWinds LAN surveyor

[#] CyberGauge software

[*] Internet search engines

[*] Cisco Tools & Resources web site


5. The newly configured ASBR that connects a company to the Internet has a default route configured and has the default-information originate command entered. Devices connected through this router can access the Internet. The problem is that no other OSPF routers have a default route in the routing table and no other users throughout the organization can access the Internet. What could be the problem?

The ASBR does not have OSPF configured.

The ASBR does not have an OSPF neighbor.

The ASBR should use the exit_interface argument instead of next-hop on the default route.

The other routers are not configured to accept LSA type 4s.


6. Users are reporting longer delays in authentication and in accessing network resources during certain time periods of the week. What kind of information should network engineers check to find out if this situation is part of a normal network behavior?

Syslog records and messages

debug output and packet captures

network configuration files

the network performance baseline


7. A team of engineers has identified a solution to a significant network problem. The proposed solution is likely to affect critical network infrastructure components. What should the team follow while implementing the solution to avoid interfering with other processes and infrastructure?

one of the layered troubleshooting approaches

syslog messages and reports

change-control procedures

knowledge base guidelines


8. Which troubleshooting method begins by examining cable connections and wiring issues?






9. An administrator is troubleshooting an Internet connectivity problem on a router. The output of the show interfaces gigabitethernet 0/0 command reveals higher than normal framing errors on the interface that connects to the Internet. At what layer of the OSI model is the problem likely occurring?

Layer 3

Layer 4

Layer 2

Layer 1

Layer 7


10. In which step of gathering symptoms does the network engineer determine if the problem is at the core, distribution, or access layer of the network?

Determine ownership.

Narrow the scope.

Document the symptoms.

Gather information.

Determine the symptoms.


11. A network engineer issues the show cdp neighbor command on several network devices during the process of network documentation. What is the purpose of performing this command?

to check the networks that are advertised by the neighboring routers

to check the connectivity of PCs that are connected to the network devices

to obtain information about directly connected Cisco devices

to verify the network addresses that are attached to the network devices


12. A network administrator is configuring SSH on a router. When verifying the configuration, the administrator notices that the SSH connection requests fail, but the Telnet connection requests from the same workstation are successful. Which two parts of the router configuration should be checked to try to locate the problem? (Choose two.)

A standard ACL is possibly blocking the workstation from access to the router.

The password is misconfigured on the console line.

An extended ACL that is referencing the port argument for SSH is misconfigured.

The transport input command is incorrect on the vty lines.

The ip access-class command is missing.


13. When should a network performance baseline be measured?

during normal work hours of an organization

immediately after the main network devices restarted

when a denial of service attack to the network is detected and blocked

after normal work hours to reduce possible interruptions


14. What is a purpose of establishing a network baseline?

It checks the security configuration of network devices.

It creates a point of reference for future network evaluations.

It provides a statistical average for network performance.

It manages the performance of network devices.


15. Which two specialized troubleshooting tools can monitor the amount of traffic that passes through a switch? (Choose two.)

digital multimeter

DTX cable analyzer



portable network analyzer


16. 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?

from the network layer to the physical layer

from the network layer to the application layer

only the network layer

all of the layers


17. Refer to exhibit. A network engineer is troubleshooting a WAN connectivity problem. A ping to a remote router is successful and an attempt to telnet to the same router displays the exhibited output. What does the output verify?

A network engineer is troubleshooting a WAN connectivity problem

The web server service is password protected.

The transport layer is connecting successfully.

A Telnet password has not been configured on the remote router.

The remote router IPv6 address is incorrect.


18. Which number represents the most severe level of syslog logging?







19. 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 PC has a missing or incorrect default gateway.

The default gateway router does not have a default route.

The link between the switch to which the PC connects and the default gateway router is down.

The switch port to which the PC connects has an incorrect VLAN configured.


20. Refer to the exhibit. On the basis of the output, which two statements about network connectivity are correct? (Choose two.)

On the basis of the output, which two statements about network connectivity are correct?

There is connectivity between this device and the device at

The average transmission time between the two hosts is 2 miliseconds.

The connectivity between these two hosts allows for videoconferencing calls.

This host does not have a default gateway configured.

There are 4 hops between this device and the device at


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

It defines how hosts and network devices connect to the 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 shows the order in which hosts access the network.


22. After cables were reconnected to a switch in a wiring closet, several PCs that had been previously configured manually can no longer access resources outside the local network. The PC configurations were not altered in the process and resources on the local network can still be accessed. What is a possible cause of the problem?

The cabling to the PCs is faulty.

The DHCP server has been misconfigured.

The DNS configuration on the PCs is incorrect.

The PCs are no longer on the correct VLAN.


23. A user reports that the workstation cannot connect to a networked printer in the office in order to print a report created with word processing software. Which troubleshooting action by the helpdesk technician would follow the divide-and-conquer approach?

Ask the user to unplug and reattach the network cable.

Ask the user to save the working document.

Ask the user to launch the web browser.

Ask the user to issue the ipconfig command.


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

Is your email working now?

What kind of equipment are you using to send emails?

How big are the emails you tried to send?

When did you first notice your email problem?


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

narrowing the scope

determining ownership

gathering symptoms from suspect devices

documenting symptoms


26. A user reports that after an OS patch of the networking subsystem has been applied to a workstation, it performs very slowly when connecting to network resources. A network technician tests the link with a cable analyzer and notices that the workstation sends an excessive number of frames smaller than 64 bytes and also other meaningless frames. What is the possible cause of the problem?

Cabling faults

corrupted application installation

Ethernet signal attenuation

corrupted NIC driver


27. 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?

baselining tool

fault-management tool

protocol analyzer

cable analyzer


28. An internal corporate server can be accessed by internal PCs, but not by external Internet users that should have access. What could be the issue?

The switch port to which the server connects has an incorrect VLAN configured.

The default gateway router for the server does not have a default route.

The server does not have a private IP address assigned.

Static NAT has not been configured properly or at all.


29. A group of Windows PCs in a new subnet has been added to an Ethernet network. When testing the connectivity, a technician finds that these PCs can access local network resources but not the Internet resources. To troubleshoot the problem, the technician wants to initially confirm the IP address and DNS configurations on the PCs, and also verify connectivity to the local router. Which three Windows CLI commands and utilities will provide the necessary information? (Choose three.)



netsh interface ipv6 show neighbor




arp -a


30. Fill in the blank.

Use the _ ARP_ cache to verify IPv4 address to Layer 2 Ethernet address mappings on a host computer.


31. Which type of tool would an administrator use to capture packets that are going to and from a particular device?

baselining tool

protocol analyzer

NMS tool

knowledge base

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