chapter 8

What is the cause of the problem?

Routing between HQ and Branch is configured incorrectly.

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?

Static NAT has not been configured properly or at all.

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 an OSPF neighbor.

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.

A client calls the support desk and says this to a technician: "I have just started my computer and attempted to check e-mail. The error 0x800ccc0d was displayed. However, I was able to connect to network drives and access the Internet." Which statement would describe the status of this issue?

The helpdesk has enough information to begin finding a resolution.

Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?

ARP cache

A network engineer is investigating an access issue to a web server. The web server can access the Internet and the local clients can open the web pages. However, outside clients cannot access the web pages. What is the most likely cause of the problem?

An ACL is blocking incoming connections.

After gathering symptoms, if the troubleshooter determines that the problem is located outside the control of the organization, what is the next step?

Contact the administrator of the external system.

Refer to the exhibit. What action occurs at stage 3 of the general troubleshooting process?

Correct the problem.

Which feature sends simulated data across the network and measures performance between multiple network locations?

IP SLA

Refer to the exhibit. On the basis of the information presented, which two IP SLA related statements are true? (Choose two.)

IP SLA 99 will run forever unless explicitly disabled. IP SLA 99 is sending echo requests every 10 seconds.

Which three pieces of information are typically recorded in a logical topology diagram? (Choose three.)

IP address and prefix lengths static routes routing protocols

Refer to the exhibit. A network administrator issues the commands in order to configure secure remote access to the router. However, the administrator notices that sessions are still being made over telent and are in plain-text. What action should be taken to encrypt the remote access traffic?

Issue the no transport input telnet ssh command and then issue the transport input ssh command.

What is a purpose of establishing a network baseline?

It creates a point of reference for future network evaluations.

Which statement describes the physical topology for a LAN?

It defines how hosts and network devices connect to the LAN.

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 2

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

NAM portable network analyzer

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?

Narrow the scope.

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

When did you first notice your email problem?

Users report that their PCs cannot access the file server that is located in the server farm at the headquarters building. The support desk technician checks the latest network update reports and realizes that the router that was connected to the network segment of those users failed suddenly and has just been replaced. What command should the technician instruct the users to issue on the PCs to solve the problem?

arp -d

When is the most appropriate time to measure network operations to establish a network performance baseline?

at the same time each day across a set period of average working days, so that typical traffic patterns can be established

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

bottom-up

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

cable tester

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?

change-control procedures

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?

corrupted NIC driver

A network engineer is troubleshooting a network that has recently been updated with a new routing protocol, but the network is not working as expected. The engineer is comparing the running configuration from before and after the change was made. Which approach to troubleshooting the problem is the engineer using?

divide-and-conquer

When should a network performance baseline be measured?

during normal work hours of an organization

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 application layer

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

gathering symptoms from suspect devices

A network administrator is having issues with a newly installed network not appearing in other routers. At which layer of the OSI model is the network administrator going to start the troubleshooting process when using a top-down approach?

network

Which category of software troubleshooting tools provides device-level monitoring, configuration, and fault-management?

network management system tools

An attack has been launched within a company and a host name has been identified as the source. What command can a network technician use to determine the IP address assigned to the host name?

nslookup

Which command runs several other show commands in order to generate many pages of detailed troubleshooting information?

show tech-support

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 status of the departmental workgroup switch in the wiring closet

Which number represents the most severe level of syslog logging?

0

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.)

nslookup ipconfig ping

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?

protocol analyzer

What are two reasons to create a network baseline? (Choose two.)

to identify future abnormal network behavior to determine if the network can deliver the required policies

A network administrator issues the telnet www.cisco.com 25 command on the workstation. What is the purpose of this command?

to probe the server that provides the web service to determine if it is also running an email service

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?

top-down

Users report that the new web site http://www.company1.biz cannot be accessed. The helpdesk technician checks and verifies that the web site can be accessed with http://www.company1.biz:90. Which layer in the TCP/IP model is involved in troubleshooting this issue?

transport