Network+ Domain 5: Network Troubleshooting

Which TCP/IP utility gives you the following output: Route Table, Interface List, Active Routes, Persistent Routes?

• netstat -r

• netstat -s

• netstat -a

• netstat

Which of the following tools would you use to view the MAC addresses associated with IP addresses that the local workstation has contacted recently?

• arp

• netstat

• arping

• nbtstat

When troubleshooting a network connectivity issue on a Unix system, which two utilities can be used to ensure that the communication between the Unix system and the DNS server is working correctly?

• dig

• tracerert

• arp

• nslookup

As a network administrator, what should you do first when a frantic user reports that nothing is working in your troubleshooting strategy?

• Recognize the potential side effects of the problem

• Establish the symptoms

• Establish what has changed

• Identify the affected area

Which of the following common network issues can be caused by multicast flooding?

• Switching loops

• DHCP scope exhaustion

• Routing loops

• None of the above

Which of the following can cause broadcast storms?

• Duplicate MAC addresses

• Routing loops

• Switching loops

• Duplicate IP addresses

What could cause a large number of CRC errors on one interface of a Cisco switch?

• Two hosts on the network with the same MAC address.

• Collisions between two or more network hosts.

• A strong EMI emitter near the cable connected to that interface.

• An incorrect subnet mask configured on the workstation.

If unauthorized wireless access points are suspected within an organization, which two actions should be taken?

• Conduct a site survey.

• Check the MAC addresses of devices that are connected to your wired switch.

• Update the firmware of all network devices.

• Restrict user access to network settings.

A user reports that she can't connect to the internet due to a misconfiguration of the wireless router. As the manager of the wireless access point, what is your next step?

• Document the problem.

• Create an action plan.

• Fix the problem.

• Determine if escalation is needed.

A user cannot access the new server in the accounting department, and her computer cannot access any server on that subnet, but can access other subnets and the internet. What is the most likely cause of this issue?

• Missing route on the default gateway router.

• Incorrect default gateway setting.

• Switching loop on the user's subnet.

• Incorrect VLAN membership on the accounting server.