Explanation of Answer B:The commandssh -L 5011:127.0.0.1:80 bob@10.10.2.20 -f sleep 30creates a local port forward. This means port5011on the client machine is forwarded to port80on the remote machine (10.10.2.20) using the SSH connection.
Explanation of Answer E:The-foption of thesshcommand causes the SSH connection process to fork to the background after authentication is complete. Thesleep 30command keeps the SSH connection alive for 30 seconds.
[Reference:, Oracle Linux 8 Documentation:Oracle Linux Secure Shell Guide, SSH tunneling and port forwarding are covered in the guide., Clarification on Incorrect Options:, Option A:is incorrect because a reverse tunnel is not created; the command is for local port forwarding., Option C:is incorrect; the socket remains open for 30 seconds (not minutes) due to thesleep 30command., Option D:is incorrect because the web server is not listening on port 5011; it's the local forwarding that forwards traffic to the remote web server on port 80., , ]
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