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Difficulty: MediumRemote Access Technologies and Tools

A network administrator needs to grant a third-party vendor secure command-line management access to an edge network appliance across an untrusted public connection. Corporate security policy strictly prohibits transmitting administrative credentials or session traffic in cleartext. Which remote access protocol and default port combination should be configured to satisfy this security requirement?

  1. SSH over TCP port 22Answer
  2. B
    Telnet over TCP port 23
  3. C
    RDP over TCP port 3389
  4. D
    SFTP over TCP port 21

Answer

SSH over TCP port 22
Secure Shell (SSH) on TCP port 22 provides an encrypted communication channel for remote command-line sessions, satisfying the requirement for secure administration over untrusted network paths.

Step-by-Step Solution

1
Analyze access requirements
Identified the need for interactive command-line access with strong encryption across an untrusted network.
Corporate policy strictly forbids cleartext management protocols like Telnet.
2
Compare candidate remote access protocols
SSH provides encrypted CLI management over TCP port 22, whereas Telnet uses TCP port 23 without encryption.
SSH is designed as a secure replacement for legacy unencrypted terminal protocols.
3
Select the compliant protocol and port
Configured SSH on default TCP port 22.
SSH over TCP port 22 fulfills all security and functional requirements.

Key Concept

Secure Shell (SSH) default port assignment and encryption capabilities for remote CLI management
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Topics

Remote Access Technologies and Tools

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