CCNA 4 Chapter 8 V4.0 Answers

1. What combination of IP address and wildcard mask should be used to specify only the last 8 addresses in the subnet


2. Excessive broadcasts are generally a symptom of a problem at which layer?


data link





CCNA 4 Chapter 8 V4.0 Answers
Refer to the exhibit. Which three pieces of information can be determined by analyzing the output shown? (Choose three.)

A carrier detect signal is present.

Keepalives are being received successfully.

Default encapsulation is used on this serial link.

Packets passing this interface cannot exceed 1 KB in size.

The reliability of this link is very low.

The LCP negotiation phase is complete.


4. A network administrator has received complaints that users on a local LAN can retrieve e-mail from a remote e-mail server but are unable to open web pages on the same server. Services at which two layers of the OSI model should be investigated during the troubleshooting process? (Choose two.)

physical layer

data link layer

network layer

transport layer

application layer


5. When gathering symptoms for troubleshooting a network problem, which step could result in getting an external administrator involved in the process?

narrowing the scope

gathering symptoms from suspect devices

analyzing existing symptoms

determining ownership


6. Encapsulation errors from mismatched WAN protocols on a serial link between two routers indicate a problem at which OSI layer?


data link





CCNA 4 Module 8 Answers 2010
Refer to the exhibit. Users at Branch B are reporting trouble accessing a corporate website running on a server that is located at HQ. HQ and Branch A users can access the website. R3 is able to ping successfully but not The users at Branch B can access servers at Branch A. Which two statements are true aboutthe troubleshooting efforts? (Choose two.)

The web server should be tested for an application layer problem.

Frame Relay at R3 and R2 should be tested to narrow the scope of the problem.

The fact that users at Branch A are working normally proves that there is no problem at R2.

An ACL entry error could cause the failure at Layer 4 in either R3 or R2.

The successful ping from R3 to R1 proves that the WAN is functioning normally. Therefore, the problem has to be in the upper layers.


8. Which troubleshooting approach is suggested for dealing with a complex problem that is suspected of being caused by faulty network cabling?

bottom up

top down

divide and conquer

middle out


9. Users are complaining of very long wait times to access resources on the network. The show interface command reveals collision counts far above the network baseline. At which OSI layer should the administrator begin troubleshooting?




data link




CCNA Exploration 4 Chapter 8 Answers
Refer to the exhibit. Users on the Internal LAN are unable to connect to the www server. The network administrator pings the server and verifies that NAT is functioning correctly. Which OSI layer should the administrator begin to troubleshoot next?


data link




11. Which two statements are true concerning logical networking models? (Choose two.)

TCP/IP splits the lowest layer of the OSI model into two separate layers.

The top layer of the TCP/IP model combines the functions of the top three OSI layers.

Troubleshooting with the TCP/IP model requires different techniques than with the OSI model.

The network access layer is responsible for exchanging packets between devices on a TCP/IP network.

The Internet layer provides communication between applications, such as FTP, HTTP, and SMTP on separate hosts.

The TCP/IP network access layer corresponds to the OSI physical and data link layers.



CCNA Exploration 4 Module 8 Exam Answers
Refer to the exhibit. Which two steps should be taken during the process of creating network documentation? (Choose two.)

Record the information about the devices discovered in the Campus network only.

Record the information about the devices discovered in the entire network, including the remote locations.

Transfer any information about the devices from the network configuration table that corresponds to a component of the topology diagram.

Transfer only the Layer 2 and Layer 3 information about the devices from the network configuration table that corresponds to a component of the topology diagram.

Transfer the recorded information about the devices from the network configuration table gathered during peak network utilization that corresponds to a component of the topology diagram.


13. What is one example of a physical layer problem?

incorrect encapsulation

incorrect STP configuration

incorrect ARP mapping

incorrect clock rate


14. Clients across the company are reporting poor performance across all corporate applications running in the data center. Internet access and applications running across the corporate WAN are performing normally. The network administrator observes a continual broadcast of random meaningless traffic (jabber) on the application server LAN in the data center on a protocol analyzer. How should the administrator start troubleshooting?

The jabber in the data center indicates a local physical layer problem. Use the protocol analyzer to determine the source of the jabber, and then check for a recent NIC driver update or bad cabling.

Because all clients are experiencing application problems, the administrator should use a top-down approach with the application servers in the data center.

The scope of the problem indicates a likely routing or spanning-tree problem. Begin by checking routing tables, and follow up using appropriate STP show commands to find a loop if routing is working normally.

Poll the staff to determine if any recent changes have been made. Back out all the changes one by one until the error condition is fixed.


15. A technician has been asked to make several changes to the configuration and topology of a network and then determine the outcome of the changes. What tool can be used to determine the overall effect caused by the changes?

baselining tool

knowledge base

protocol analyzer

cable tester


16. A technician has been asked to troubleshoot an existing switched network but is unable to locate documentation for the VLAN configuration. Which troubleshooting tool allows the technician to map and discover VLAN and port assignments?

cable analyzer

network analyzer

protocol analyzer

knowledge base


17. Which two pieces of information are typically found on a logical network diagram? (Choose two.)

cable types

connector types

interface identifiers

DLCI for virtual circuits

operating system versions


18. Which two components should be taken into consideration when establishing a network baseline? (Choose two.)

information about the network design

IP addressing allocation on the network

requirements about the service provider setup

requirements for access control lists to regulate traffic

expected performance under normal operating conditions


19. Which three approaches should be used when attempting to gather data from users for troubleshooting? (Choose three.)

Determine fault.

Get to know the user to build trust.

Obtain information by asking simple pertinent questions.

Impress the user with use of technical language and skills.

Determine if the problem is related to time or a specific event.

Determine if the user can re-create the problem or events leading to the problem.


20. Information about which OSI layers of connected Cisco devices can be verified with the show cdp neighbors command?

All layers

Layer 1, Layer 2, and Layer 3

Layer 1, Layer 2, Layer 3, and Layer 4

Layer 6 and Layer 7

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