Network Troubleshooting Tools Flashcards
6 cards from real CCST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Network Troubleshooting Tools flashcards as text
When using traceroute, what does it mean if several consecutive hops show '* * *' (asterisks)?
Answer: Those routers are not responding to TTL-expired probes, often due to firewall rules
Asterisks in traceroute output indicate that routers at those hops are not sending TTL-exceeded ICMP messages back, typically due to filtering.
Which command can a technician use on a Cisco IOS device to verify current active connections and listening TCP ports?
Answer: show ip sockets
'show ip sockets' on Cisco IOS displays the active TCP and UDP socket connections on the device.
A host has an IP address of 169.254.x.x. What does this indicate?
Answer: DHCP failed and the host assigned itself an APIPA address
169.254.0.0/16 is the APIPA (Automatic Private IP Addressing) range, assigned automatically when a host cannot reach a DHCP server.
Which command on a Windows PC shows the local routing table, including the default gateway route?
Answer: route print
'route print' displays the full IPv4 and IPv6 routing tables on a Windows host, including the default route (0.0.0.0).
A technician pings a remote host and receives 'Destination Host Unreachable'. What does this response mean?
Answer: A router along the path has no route to the destination
'Destination Host Unreachable' is an ICMP error from an intermediate router indicating it has no route to the specified destination.
Which tool would a technician use to test whether a specific TCP port (e.g., port 443) is open on a remote server?
Answer: telnet or Netcat (nc)
Telnet or Netcat can attempt a TCP connection to a specific port, confirming whether that port is open and accepting connections.