CCNA 4, Chapter 8 Exam
Questions and Answers
- 1.
When should a network performance baseline be measured?
- A.
During normal work hours of an organization
- B.
Immediately after the main network devices restarted
- C.
After normal work hours to reduce possible interruptions
- D.
When a denial of service attack to the network is detected and blocked
Correct Answer
A. During normal work hours of an organizationExplanation
A network performance baseline should be measured during normal work hours of an organization because it provides a realistic representation of the network's performance under typical usage conditions. This allows for accurate comparisons and analysis of network performance over time. Measuring the baseline during this time also helps identify any potential bottlenecks or issues that may arise during peak usage periods, enabling proactive troubleshooting and optimization.Rate this question:
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- 2.
What is a purpose of establishing a network baseline?
- A.
It creates a point of reference for future network evaluations.
- B.
It provides a statistical average for network performance.
- C.
It manages the performance of network devices.
- D.
It checks the security configuration of network devices.
Correct Answer
A. It creates a point of reference for future network evaluations.Explanation
Establishing a network baseline serves the purpose of creating a point of reference for future network evaluations. This means that it allows network administrators to have a benchmark or standard against which they can compare the performance and behavior of the network over time. By establishing a baseline, any deviations or abnormalities in network performance can be easily identified and addressed. This helps in troubleshooting network issues, optimizing performance, and planning for future network upgrades or changes.Rate this question:
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- 3.
Which three pieces of information are typically recorded in a logical topology diagram? (Choose three.)
- A.
IP address and prefix lengths
- B.
routing protocols
- C.
static routes
- D.
device models and manufacturers
- E.
Cable specifications
- F.
Device locations
Correct Answer(s)
A. IP address and prefix lengths
B. routing protocols
C. static routesExplanation
A logical topology diagram typically records the IP address and prefix lengths, routing protocols, and static routes. The IP address and prefix lengths are essential for understanding the network addressing scheme. Routing protocols are recorded to show how devices communicate and exchange routing information. Static routes are included to indicate manually configured paths. The other options, such as device models and manufacturers, cable specifications, and device locations, are typically recorded in a physical topology diagram rather than a logical one.Rate this question:
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- 4.
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?
- A.
Document the symptoms.
- B.
Determine the symptoms.
- C.
Gather information.
- D.
Determine ownership.
- E.
Narrow the scope.
Correct Answer
E. Narrow the scope.Explanation
In the process of gathering symptoms, the network engineer determines if the problem is at the core, distribution, or access layer of the network by narrowing the scope. This step involves analyzing the documented symptoms and gathered information to identify the specific area or layer where the issue might be occurring. By narrowing down the scope, the engineer can focus their troubleshooting efforts on the relevant layer, which helps in resolving the problem more efficiently.Rate this question:
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- 5.
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?
- A.
change-control procedures
- B.
one of the layered troubleshooting approaches
- C.
knowledge base guidelines
- D.
syslog messages and reports
Correct Answer
A. change-control proceduresExplanation
The team should follow change-control procedures while implementing the solution to avoid interfering with other processes and infrastructure. Change-control procedures ensure that any changes made to the network are properly planned, tested, and documented. This helps to minimize the risk of unintended consequences or disruptions to other systems. By following change-control procedures, the team can ensure that the proposed solution is implemented in a controlled and organized manner, reducing the chances of interference with critical network infrastructure components.Rate this question:
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- 6.
Refer to the exhibit. What action occurs at stage 3 of the general troubleshooting process?
- A.
Correct the problem.
- B.
Narrow the scope.
- C.
Question end users.
- D.
Document symptoms.
Correct Answer
A. Correct the problem.Explanation
At stage 3 of the general troubleshooting process, the action that occurs is to correct the problem. This means that after identifying the problem and narrowing down the scope of the issue, the next step is to take the necessary actions to resolve the problem and fix any errors or malfunctions. This may involve implementing solutions, making adjustments, or repairing any faulty components or systems in order to restore normal functionality.Rate this question:
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- 7.
After which step in the network troubleshooting process would one of the layered troubleshooting methods be used?
- A.
Documenting symptoms
- B.
Determining ownership
- C.
Narrowing the scope
- D.
Gathering symptoms from suspect devices
Correct Answer
D. Gathering symptoms from suspect devicesExplanation
After determining ownership and narrowing the scope, the next step in the network troubleshooting process would be gathering symptoms from suspect devices. This step involves collecting information and data from the devices that are suspected to be causing the issue. By gathering symptoms from these devices, network administrators can analyze the data and identify any patterns or anomalies that may help in troubleshooting and resolving the network problem. This step is crucial in the layered troubleshooting approach as it focuses on specific devices and their symptoms to further investigate and diagnose the issue.Rate this question:
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- 8.
A network technician is troubleshooting an email connection problem. Which question to the end-user will provide clear information to better define the problem?
- A.
Is your email working now?
- B.
How big are the emails you tried to send?
- C.
What kind of equipment are you using to send emails?
- D.
When did you first notice your email problem?
Correct Answer
D. When did you first notice your email problem?Explanation
Asking the end-user when they first noticed the email problem will provide a clear starting point for troubleshooting. This information will help the technician determine if there were any recent changes or events that could have caused the issue. It will also help in identifying any potential patterns or correlations with other system changes or updates.Rate this question:
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- 9.
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?
- A.
From the network layer to the application layer
- B.
All of the layers
- C.
From the network layer to the physical layer
- D.
Only the network layer
Correct Answer
A. From the network layer to the application layerExplanation
The network engineer should investigate from the network layer to the application layer because Telnet is an application layer protocol. If the engineer can successfully ping between the two devices, it indicates that the network layer is functioning properly. However, since Telnet is not working, there may be an issue with the higher layers of the OSI model, such as the transport layer, session layer, presentation layer, or application layer. Investigating these layers will help identify the problem with Telnet.Rate this question:
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- 10.
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?
- A.
Network
- B.
Application
- C.
Internet
- D.
Session
- E.
Transport
Correct Answer
A. NetworkExplanation
In a top-down approach to troubleshooting, the network administrator would start at the highest layer of the OSI model, which is the application layer. However, since the issue is related to the network not appearing in other routers, the network layer would be the logical starting point for troubleshooting. This layer is responsible for routing and addressing, so it is likely that there is a problem with the network configuration or routing protocols that is causing the network not to be visible to other routers.Rate this question:
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- 11.
Which troubleshooting method begins by examining cable connections and wiring issues?
- A.
Bottom-up
- B.
Top-down
- C.
Substritution
- D.
Divide-and-conquer
Correct Answer
A. Bottom-upExplanation
The bottom-up troubleshooting method begins by examining cable connections and wiring issues. This approach starts with the physical layer of the network and works its way up to higher layers. By first checking the cables and wiring, any issues or faults in the physical infrastructure can be identified and resolved, which can often solve many network problems. This method is effective in troubleshooting connectivity issues and ensuring that the network is properly connected and functioning at a basic level before moving on to more complex layers.Rate this question:
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- 12.
Refer to the exhibit. On the basis of the information presented, which two IP SLA related statements are true? (Choose two.)
- A.
IP SLA 99 is sending echo requests every 10 seconds.
- B.
IP SLA 99 is measuring jitter.
- C.
IP SLA 99 is scheduled to begin in 2 hours.
- D.
IP SLA 99 is sending echo requests from IP address 192.168.2.1.
- E.
IP SLA 99 is configured with the type dns target-addr 192.168.2.1 command.
- F.
IP SLA 99 will run forever unless explicitly disabled.
Correct Answer(s)
A. IP SLA 99 is sending echo requests every 10 seconds.
F. IP SLA 99 will run forever unless explicitly disabled.Explanation
The first statement is true because the exhibit shows that IP SLA 99 is configured to send echo requests every 10 seconds. The second statement is true because the exhibit does not provide any information about measuring jitter, so it cannot be determined whether IP SLA 99 is measuring jitter or not.Rate this question:
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- 13.
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?
- A.
Fault-management tool
- B.
Protocol analyzer
- C.
Baselining tool
- D.
Cable analyzer
Correct Answer
B. Protocol analyzerExplanation
A protocol analyzer should be used to verify that the setup is correct and that the authentication is indeed encrypted. A protocol analyzer is a tool used to capture, analyze, and interpret network traffic. It can examine the packets exchanged between the client and server during the authentication process and determine if the data is being encrypted using SSL technology. This tool can help the network engineer ensure that the authentication credentials are being protected as intended.Rate this question:
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- 14.
Which category of software troubleshooting tools provides device-level monitoring, configuration, and fault-management?
- A.
Network management system tools
- B.
Knowledge bases
- C.
Baselining tools
- D.
Host-based protocol analyzers
Correct Answer
A. Network management system toolsExplanation
Network management system tools provide device-level monitoring, configuration, and fault-management. These tools are designed to monitor and manage network devices such as routers, switches, and servers. They allow administrators to monitor the performance and status of these devices, configure them as needed, and troubleshoot any faults or issues that may arise. By providing comprehensive monitoring and management capabilities, network management system tools help ensure the smooth operation of a network and enable quick resolution of any problems that may occur.Rate this question:
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- 15.
Which two specialized troubleshooting tools can monitor the amount of traffic that passes through a switch? (Choose two.)
- A.
NAM
- B.
TDR
- C.
Digital multimeter
- D.
Portable network analyzer
- E.
DTX cable analyzer
Correct Answer(s)
A. NAM
D. Portable network analyzerExplanation
NAM (Network Analysis Module) and portable network analyzer are two specialized troubleshooting tools that can monitor the amount of traffic that passes through a switch. NAM is a module that can be installed in a switch to provide detailed network traffic analysis and monitoring capabilities. A portable network analyzer, on the other hand, is a standalone device that can be connected to a switch to capture and analyze network traffic. Both tools are useful in troubleshooting network issues and monitoring network performance.Rate this question:
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- 16.
Which number represents the most severe level of syslog logging?
- A.
0
- B.
1
- C.
6
- D.
7
Correct Answer
A. 0Explanation
The number 0 represents the most severe level of syslog logging. In syslog, severity levels are used to prioritize and categorize log messages. The severity level 0 is known as "Emergency" and is used for critical system failures that require immediate attention. It indicates the highest level of severity and signifies that the system is unusable or in an unstable state.Rate this question:
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- 17.
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?
- A.
The power outlet to the PC that is used by the caller
- B.
The trunks between switches in the wiring closet
- C.
The status of the departmental workgroup switch in the wiring closet
- D.
The cable that connects the PC of the caller to the network jack
- E.
The cable connection between a PC and a network outlet that is used by a neighbor
Correct Answer
C. The status of the departmental workgroup switch in the wiring closetExplanation
The technician should check the status of the departmental workgroup switch in the wiring closet as the first step in troubleshooting the issue. Since multiple machines in the same department are experiencing the same problem and cannot ping each other, it suggests that the issue may be related to the workgroup switch that connects those machines to the network. Checking the status of the switch will help determine if it is functioning properly and if there are any configuration or connectivity issues that need to be addressed.Rate this question:
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- 18.
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?
- A.
Corrupted NIC driver
- B.
Cabling faults
- C.
Ethernet signal attenuation
- D.
Corrupted application installation
Correct Answer
A. Corrupted NIC driverExplanation
The possible cause of the problem is a corrupted NIC driver. This can lead to the workstation sending excessive frames smaller than 64 bytes and other meaningless frames, resulting in slow performance when connecting to network resources.Rate this question:
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- 19.
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?
- A.
Layer 1
- B.
Layer 2
- C.
Layer 3
- D.
Layer 4
- E.
Layer 7
Correct Answer
B. Layer 2Explanation
The higher than normal framing errors indicate an issue with the physical layer of the network, which is Layer 1 of the OSI model. This layer deals with the physical transmission of data, including the cables, connectors, and signaling. Framing errors occur when there are problems with the synchronization of data between the transmitting and receiving devices. Therefore, the problem is likely occurring at Layer 1.Rate this question:
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- 20.
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.)
- A.
Ipconfig
- B.
Arp -a
- C.
Nslookup
- D.
Ping
- E.
Telnet
- F.
Tracert
- G.
Netsh interface ipv6 show neighbor
Correct Answer(s)
A. Ipconfig
C. Nslookup
D. PingExplanation
The ipconfig command will provide the IP address and DNS configurations on the PCs. The nslookup command will allow the technician to verify the DNS configuration and check if the PCs can resolve domain names. The ping command will help the technician verify connectivity to the local router by sending ICMP echo requests and checking for responses.Rate this question:
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- 21.
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?
- A.
Application
- B.
Transport
- C.
Internet
- D.
Network access
Correct Answer
B. TransportExplanation
The correct answer is transport. In this scenario, the helpdesk technician is able to access the website using a specific port number (port 90) but not the default port number (port 80). This indicates that there may be an issue with the transport layer of the TCP/IP model. The transport layer is responsible for establishing connections and ensuring reliable data transfer between devices. By accessing the website with a different port number, the technician is troubleshooting the issue at the transport layer.Rate this question:
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- 22.
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?
- A.
The PC has a missing or incorrect default gateway.
- B.
The default gateway router does not have a default route.
- C.
The switch port to which the PC connects has an incorrect VLAN configured.
- D.
The link between the switch to which the PC connects and the default gateway router is down.
Correct Answer
A. The PC has a missing or incorrect default gateway.Explanation
The PC has a missing or incorrect default gateway, which is causing it to have trouble accessing the Internet. The default gateway is responsible for routing network traffic between different networks, such as the local network and the Internet. If the PC does not have a default gateway configured, or if the configured default gateway is incorrect, it will not be able to properly route its network traffic to the Internet. This is why the PC is able to print to a local printer and ping other computers on the same network, but is unable to access the Internet.Rate this question:
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- 23.
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?
- A.
The ASBR does not have OSPF configured.
- B.
The ASBR does not have OSPF neighbor.
- C.
The other routers are not configured to accept LSA type 4s.
- D.
The ASBR should use the exit_interface argument instead of next-hop on the default route.
Correct Answer
B. The ASBR does not have OSPF neighbor.Explanation
The problem is that the ASBR does not have OSPF neighbor. This means that the ASBR is not forming OSPF adjacencies with the other routers in the organization. As a result, the other routers are not receiving the default route information from the ASBR, and therefore, the users throughout the organization cannot access the Internet.Rate this question:
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- 24.
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?
- A.
Static NAT has not been configured properly or at all.
- B.
The server does not have a private IP address assigned.
- C.
The default gateway router for the server does not have a default route.
- D.
The switch port to which the server connects has an incorrect VLAN configured.
Correct Answer
A. Static NAT has not been configured properly or at all.Explanation
The issue could be that static NAT has not been configured properly or at all. Static NAT is a method used to translate the private IP address of an internal server to a public IP address that can be accessed over the internet. If static NAT is not configured properly or not configured at all, the internal server's private IP address will not be translated to a public IP address, making it inaccessible to external internet users.Rate this question:
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- 25.
Fill in the blank.Use the _____ cache to verify IPv4 address to Layer 2 Ethernet address mappings on a host computer.
Correct Answer
ARPExplanation
ARP (Address Resolution Protocol) is used to resolve IPv4 addresses to Layer 2 Ethernet addresses on a host computer. It is a network protocol that allows a device to discover the MAC address of another device on the same network. When a device wants to communicate with another device using its IP address, it uses ARP to obtain the MAC address associated with that IP address. This mapping is stored in the ARP cache, which is used to verify the IPv4 address to Layer 2 Ethernet address mappings on the host computer.Rate this question:
- 26.
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.A user reports that PC0 cannot visit the web server http://www.server.com. Troubleshoot the network configuration to identify the problem.What is the cause of the problem
- A.
A serial interface encapsulation is configured incorrectly.
- B.
A default route on HQ is not configured.
- C.
The DNS server address on PC0 is configured incorrectly.
- D.
The clock rate on Branch S0/0/0 is configured incorrectly.
Correct Answer
A. A serial interface encapsulation is configured incorrectly.Explanation
The cause of the problem is that the serial interface encapsulation is configured incorrectly. This means that the configuration of the interface that connects PC0 to the network is not set up properly, causing PC0 to be unable to visit the web server.Rate this question:
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