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?
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A. B. C. D.B.
Option B, TCP 22 should be opened on the Unix server to allow for remote administration.
The given scenario describes that a server technician is trying to access a remote Unix server for administration. The technician has requested that ports 23, 25, and 161 be opened on the router, but still, the technician is unable to connect to the Unix server. This suggests that the issue lies with the server's firewall settings or configuration, and not with the router.
The three ports requested to be opened are as follows:
Port 23: This is the port used for Telnet, an unsecured remote access protocol. However, this protocol has significant security vulnerabilities, and it is recommended to use SSH instead.
Port 25: This is the port used for SMTP (Simple Mail Transfer Protocol), which is used to send email messages between servers.
Port 161: This is the port used for SNMP (Simple Network Management Protocol), which is used to manage and monitor network devices.
None of these ports are typically used for remote administration of Unix servers.
Option A, TCP 21 is the port used for FTP (File Transfer Protocol), which is used to transfer files between servers. This port is also not typically used for remote administration.
Option C, UDP 69 is the port used for TFTP (Trivial File Transfer Protocol), which is a simplified version of FTP used to transfer small files between servers. Again, this port is not typically used for remote administration.
Option D, TCP 3389 is the port used for Remote Desktop Protocol (RDP), which is a proprietary protocol used by Microsoft Windows for remote administration. Since the scenario describes a Unix server, this port is also not applicable.
Therefore, the correct option is B, TCP 22. This is the port used for SSH (Secure Shell), a secure remote access protocol widely used in Unix-based systems for remote administration. By opening this port on the Unix server's firewall, the technician should be able to access the server for remote administration.