SK0-004 · Question #116
A server technician needs to access a remote Unix server for administration. The technician has requested that ports 23, 25, and 161 be opened on the router. After the ports are opened, the…
The correct answer is B. TCP 22. SSH (TCP 22) is the standard protocol for secure remote administration of Unix/Linux servers, and it was not included in the ports the technician requested.
Question
A server technician needs to access a remote Unix server for administration. The technician has requested that ports 23, 25, and 161 be opened on the router. After the ports are opened, the technician is still unable to connect to the Unix server. Which of the following ports should be opened on the server to allow for remote administration?
Options
- ATCP 21
- BTCP 22
- CUDP 69
- DTCP 3389
How the community answered
(46 responses)- A4% (2)
- B76% (35)
- C7% (3)
- D13% (6)
Why each option
SSH (TCP 22) is the standard protocol for secure remote administration of Unix/Linux servers, and it was not included in the ports the technician requested.
TCP 21 is used by FTP for file transfers and does not provide remote shell administration capability.
SSH (Secure Shell) operates on TCP port 22 and is the standard protocol for encrypted remote command-line administration of Unix and Linux systems. The technician opened ports 23 (Telnet), 25 (SMTP), and 161 (SNMP), none of which provide interactive remote shell access. Without TCP 22 open, SSH connections to the Unix server will be blocked.
UDP 69 is used by TFTP for simple file transfers and does not enable remote administration sessions.
TCP 3389 is used by RDP (Remote Desktop Protocol) for graphical remote access to Windows systems, not Unix servers.
Concept tested: SSH port 22 for Unix remote administration
Source: https://www.openssh.com/manual.html
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