GIAC
GCIH · Question #747
GCIH Question #747: Real Exam Question with Answer & Explanation
The correct answer is C: 192.168.1.80 port 23. In SSH local port forwarding, the -L flag syntax is local_port:destination_host:destination_port, so the final destination is the host and port after the colon separator following the local port.
Question
What is the destination endpoint host for the SSH session shown below? ssh - L 1777:192.168.1.80:23 [email protected]
Options
- A192.168.1.80 port 1777
- B192.168.1.70 port 1777
- C192.168.1.80 port 23
- D192.168.1.70 port 23
Explanation
In SSH local port forwarding, the -L flag syntax is local_port:destination_host:destination_port, so the final destination is the host and port after the colon separator following the local port.
Common mistakes.
- A. Port 1777 is the local listening port on the client machine, not the destination port on the remote endpoint; 192.168.1.80 is correct but port 1777 is not the destination port.
- B. 192.168.1.70 is the SSH jump/relay server (the host zmckracken authenticates to), not the final destination endpoint of the tunnel.
- D. 192.168.1.70 is the SSH server used as the tunnel relay, not the destination endpoint; the traffic is forwarded onward to 192.168.1.80:23.
Concept tested. SSH local port forwarding -L flag syntax and tunnel destination
Reference. https://www.ssh.com/academy/ssh/tunneling/example
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