CCST Network Troubleshooting Tools 2

Question 1

A technician runs 'ipconfig /release' followed by 'ipconfig /renew'. What is the purpose of this action?

Accepted Answer

Release the current DHCP lease and obtain a new IP address

Answer

ipconfig /release drops the current DHCP-assigned IP address, and /renew sends a new DHCP discovery to obtain a fresh lease.

Question 2

Which command flushes the local DNS resolver cache in Windows to force fresh DNS lookups?

Accepted Answer

ipconfig /flushdns

Answer

ipconfig /flushdns clears the Windows DNS resolver cache, forcing the system to perform new DNS queries for all hostnames.

Question 3

A user cannot reach a website by name but CAN ping its IP address. Which service is most likely failing?

Accepted Answer

DNS

Answer

If a host can be reached by IP but not by name, it indicates a DNS resolution failure rather than a connectivity problem.

Question 4

What does a 'Request timed out' message in a ping output typically indicate?

Accepted Answer

The ICMP packet was blocked or the host is unreachable

Answer

A 'Request timed out' result means no ICMP reply was received, suggesting the host is unreachable or a firewall is blocking ICMP.

Question 5

Which Cisco IOS command can a support technician use to verify the IP configuration on a router interface?

Accepted Answer

show ip interface brief

Answer

'show ip interface brief' provides a quick summary of all interfaces with their IP addresses and up/down status.

(CCST) Cisco Certified Support Technician Practice Test