WAN chapter 9
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 default gateway router for the server does not have a default route. The server does not have a private IP address assigned. The switch port to which the server connects has an incorrect VLAN configured
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 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. The ASBR does not have OSPF configured. The ASBR does not have an OSPF neighbor.
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 default gateway router does not have a default route. The switch port to which the PC connects has an incorrect VLAN configured. The link between the switch to which the PC connects and the default gateway router is down. The PC has a missing or incorrect default gateway.
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 client needs to plug into a different port on the switch and try the steps again before contacting the helpdesk. -More detail is required before a complete problem description can be completed. -The client needs to reboot the PC and report back to the helpdesk. -The helpdesk has enough information to begin finding a resolution. -The client needs to switch cables before the helpdesk can begin to resolve the issue
The helpdesk has enough information to begin finding a resolution.
Fill in the blank. Use the _______ cache to verify IPv4 address to Layer 2 Ethernet address mappings on a host computer.
ARP
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? -The web server does not have a default gateway configured. -An ACL is blocking incoming connections. -There is a cable fault. -There are excessive broadcasts in the network
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? -Question the end users. -Analyze existing symptoms. -Narrow the scope of the problem. -Gather symptoms from suspected devices. -Contact the administrator of the external system
Contact the administrator of the external system.
Refer to the exhibit. A network administrator issues the exhibited commands in order to configure access to the router. It is desired that all management traffic should be encrypted but messages are being exchanged in plain-text. What will correct the problem? -Use the enable secret command to configure encryption. -Add the service password-encryption command to the configuration. -Use the no ip directed-broadcast command to prevent plain-text traffic entering the router. -Issue the no transport input telnet ssh command and then issue the transport input ssh command
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 manages the performance of network devices. It creates a point of reference for future network evaluations. It provides a statistical average for network performance. It checks the security configuration of network devices.
It creates a point of reference for future network evaluations.
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.
It defines how hosts and network devices connect to the LAN
Which statement describes the physical topology for a LAN? It shows the order in which hosts access the network. 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 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 1 Layer 2 Layer 3 Layer 4 Layer 7
Layer 2
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? Gather information. Narrow the scope. Determine ownership. Determine the symptoms. Document the symptoms.
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? How big are the emails you tried to send? Is your email working now? When did you first notice your email problem? What kind of equipment are you using to send emails?
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 -a arp -d ipconfig /renew ipconfig /flushdns
arp -d
When is the most appropriate time to measure network operations to establish a network performance baseline? -at random times during a 10 week period, so that abnormal traffic levels can be detected -during quiet vacation periods, so that the level of non-data traffic can be determined -whenever high network use is detected, so that how the network performs under stress can be monitored -at the same time each day across a set period of average working days, so that typical traffic patterns can be established
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? top-down divide-and-conquer substitution bottom-up
bottom-up
Which troubleshooting tool can be used to pinpoint the distance to a break in a network cable? digital multimeter network analyzer network analysis module cable tester
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? syslog messages and reports change-control procedures knowledge base guidelines one of the layered troubleshooting approaches
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 corrupted application installation cabling faults Ethernet signal attenuation
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? -comparing IP settings on network devices -divide-and-conquer -bottom-up -top-down
divide-and-conquer
When should a network performance baseline be measured? when a denial of service attack to the network is detected and blocked after normal work hours to reduce possible interruptions during normal work hours of an organization immediately after the main network devices restarted
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? all of the layers only the network layer from the network layer to the application layer from the network layer to the physical layer
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? documenting symptoms determining ownership narrowing the scope gathering symptoms from suspect devices
gathering symptoms from suspect devices
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? -ipconfig /all -net computer -nslookup -tracert
nslookup
Which command runs several other show commands in order to generate many pages of detailed troubleshooting information? -show ip cache -show protocols -show tech-support -show running-config
show tech-support
Which number represents the most severe level of syslog logging? 0 7 100 10 1
0
Which number represents the most severe level of syslog logging? 0 1 7 10 100
0
Which type of tool would an administrator use to capture packets that are going to and from a particular device? baselining tool NMS tool protocol analyzer knowledge base
protocol analyzer
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.) arp -a tracert ping telnet netsh interface ipv6 show neighbor nslookup ipconfig
nslookup ipconfig ping
Which two specialized troubleshooting tools can monitor the amount of traffic that passes through a switch? (Choose two.) portable network analyzer NAM DTX cable analyzer digital multimeter TDR
portable network analyzer NAM
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 protocol analyzer cable analyzer fault-management tool
protocol analyzer
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 cable that connects the PC of the caller to the network jack the status of the departmental workgroup switch in the wiring closet the trunks between switches in the wiring closet the power outlet to the PC that is used by the caller the cable connection between a PC and a network outlet that is used by a neighbor
the status of the departmental workgroup switch in the wiring closet
What are two reasons to create a network baseline? (Choose two.) -to determine what kind of equipment to implement -to evaluate security vulnerabilities in the network -to identify future abnormal network behavior -to design a network according to a proper model -to determine if the network can deliver the required policies -to select a routing protocol
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 verify that the website is operational -to establish a management session to the web server -to probe the server that provides the web service to determine if it is also running an email service -to identify the path of network traffic toward the web server
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? -comparing IP settings on user workstations -top-down -bottom-up -divide-and-conquer
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 internet network access application
transport
