CCST Network Troubleshooting & Tools 3

Question 1

A technician runs 'nslookup cisco.com' and receives a 'Non-existent domain' error. What is the MOST likely cause?

Accepted Answer

The DNS server cannot resolve the name

Answer

A 'Non-existent domain' (NXDOMAIN) response from nslookup means the DNS server responded but could not find a record for that name.

Question 2

Which command on a Cisco router shows whether OSPF neighbor adjacencies have formed?

Accepted Answer

show ip ospf neighbor

Answer

The 'show ip ospf neighbor' command lists all OSPF neighbors and their current state, confirming whether adjacencies are established.

Question 3

A user's computer shows 'Limited connectivity' and has an IP address of 169.254.x.x. What does this indicate?

Accepted Answer

DHCP failed and the host assigned itself an APIPA address

Answer

A 169.254.x.x address is an APIPA (Automatic Private IP Addressing) address assigned when a DHCP server cannot be reached.

Question 4

When using Wireshark, which filter would display only HTTP traffic?

Accepted Answer

http

Answer

In Wireshark's display filter, typing 'http' filters the capture to show only packets identified as HTTP protocol.

Question 5

A switch port is in 'err-disabled' state. What is the FIRST step to recover it?

Accepted Answer

Identify the cause, fix it, then shut/no shut the interface

Answer

You must first identify and fix the root cause of the error (such as a loop or security violation), then use 'shutdown' followed by 'no shutdown' to restore the port.

(CCST) Cisco Certified Support Technician Networking Practice Test

(CCST) Cisco Certified Support Technician Networking Practice Test

CCST Network Troubleshooting & Tools 3