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Difficulty: EasyRemote Access Technologies and Tools

A network technician needs to establish a secure, encrypted command-line session to manage a remote Linux server across an untrusted public network. Which remote access protocol and default port combination should the technician use?

  1. SSH over TCP port 22Answer
  2. B
    Telnet over TCP port 23
  3. C
    RDP over TCP port 3389
  4. D
    VNC over TCP port 5900

Answer

SSH over TCP port 22 is the correct choice for secure, encrypted remote command-line administration.
SSH (Secure Shell) on TCP port 22 is the industry-standard protocol for establishing secure, encrypted command-line remote administration sessions to remote servers over untrusted networks.

Step-by-Step Solution

1
Identify the primary operational requirement.
The requirement calls for a secure, encrypted, command-line interface for managing a remote Linux system.
Choosing the appropriate protocol depends on whether a graphical UI or command line is required, and whether traffic encryption is mandatory.
2
Evaluate the security and functionality of command-line protocols.
SSH provides encrypted shell access over TCP port 22, whereas Telnet provides unencrypted shell access over TCP port 23.
Untrusted public networks mandate encrypted protocols to prevent eavesdropping and credential theft.

Key Concept

Remote Access Protocols and Network Ports
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Topics

Remote Access Technologies and Tools

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