Network Troubleshooting Q&A: Common Issues and Resolutions

Network Troubleshooting Q&A

Common Issues and Resolutions

1. Q: Refer to the exhibit. Based on the output shown, which IP network should the workstations in the Support department belong?
   A: 172.16.3.0

2. Q: Refer to the exhibit. A network administrator is doing proactive network maintenance. The administrator pings 192.168.1.100 and compares the results with reference data. Based on the comparison of the two pings, what is a possibility?
   A: There are problems with network congestion.

3. Q: See exhibit. Given the output generated by the debug ppp negotiation, is the statement true?
   A: The line protocol of the local router is up.

4. Q: What is important to consider when configuring the subinterfaces of a router in implementing inter-VLAN routing?
   A: The IP address for each subinterface must be the default gateway address for each VLAN subnet.

5. Q: Refer to the exhibit. A lab technician connects two routers via a serial cable using the default configuration interface. The interfaces are up, however, the technician cannot ping between the two devices. What is the most likely problem?
   A: No clock rate is set on the DCE interface.

6. Q: Refer to the exhibit. Based on the output shown, why is the VTP information unable to propagate through the network?
   A: VTP domain names are different.

7. Q: The company mail server software recently underwent a minor upgrade. A network communications administrator notices an excessive amount of traffic between a database server and the recently upgraded mail server, compared with reference data. What is the first action that the administrator must take to investigate the problem?
   A: Check the logs to see what software components are causing the excess traffic.

8. Q: Refer to the exhibit. Users report that they cannot access the Internet. Routers R1 and R2 are configured with RIP version 2 as shown. If R2 receives a packet with a destination address on the Internet, how is the packet routed?
   A: The packet is routed to R1 and then sent out Fa0/0 on R1.

9. Q: Refer to the exhibit. Both routers are configured using RIPv1. Both routers are sending updates for directly connected routes. R1 can successfully ping the serial interface of R2. The routing table on R1 does not contain the dynamically learned routes from R2, and the routing table of R2 shows no dynamically learned routes from R1. What is the problem?
   A: VLSM is not supported by RIPv1.

10. Q: Refer to the exhibit. Host 192.168.1.14 is unable to download mail from 192.168.2.200. After reviewing the output of the `show running-config`, what problem is discovered?
    A: The destination host address in an ACL statement is incorrect.

11. Q: An employee called the help desk to report a laptop that could not access a web-based application on the Internet. The help desk technician asked the employee to open a Windows command prompt and type the command `ipconfig /all`. Which troubleshooting technique is this not an example of?
    A: Divide and conquer