CCST Network Troubleshooting & Tools 4

Question 1

A technician needs to verify that TCP port 443 is open on a remote server. Which command can test this from a Windows command prompt?

Accepted Answer

telnet 10.0.0.1 443

Answer

The telnet command followed by an IP and port number attempts a TCP connection to that specific port, confirming whether it is open.

Question 2

Which Cisco IOS command clears all dynamic entries from the ARP table?

Accepted Answer

clear arp-cache

Answer

The 'clear arp-cache' command removes all dynamically learned ARP entries from the Cisco device's ARP table.

Question 3

A network technician observes high CPU utilization on a Cisco router. Which command helps identify which processes are consuming CPU resources?

Accepted Answer

show processes cpu

Answer

The 'show processes cpu' command displays CPU utilization per process, helping identify which process is causing high CPU load.

Question 4

What does a 'Destination host unreachable' ICMP message from ping indicate compared to 'Request timed out'?

Accepted Answer

'Destination host unreachable' means a router reported no route; 'Request timed out' means no reply was received

Answer

'Destination host unreachable' is an ICMP error returned by an intermediate router that has no route, while 'Request timed out' simply means the reply never arrived within the timeout.

Question 5

Which log level in Cisco IOS syslog captures the most detailed debugging information?

Accepted Answer

Level 7 – Debugging

Answer

Syslog level 7 (debugging) is the most verbose level and captures all messages including detailed debugging output.

(CCST) Cisco Certified Support Technician Networking Practice Test

(CCST) Cisco Certified Support Technician Networking Practice Test

CCST Network Troubleshooting & Tools 4