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Difficulty: MediumRemote Access Technologies and Tools

A network field technician needs to connect to a remote network device to perform configuration updates over an untrusted external network. The session requires full transport-layer encryption for all command-line traffic and authentication credentials. Which protocol and default network port combination should the technician use?

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

Answer

SSH on TCP port 22 provides an encrypted terminal connection suitable for remote administration over untrusted networks.
SSH (Secure Shell) encrypts all traffic between the client and the remote host, operating on default TCP port 22. It is the industry standard tool for secure, remote command-line administration across untrusted network paths.

Step-by-Step Solution

1
Identify the interface requirement from the scenario
The scenario specifies a text-based command-line session for remote network device management.
Selecting between CLI protocols (SSH/Telnet) and graphical protocols (RDP/VNC) narrows down the choice.
2
Evaluate the security requirement
The connection takes place over an untrusted external network and requires full transport encryption.
Telnet transmits data in plaintext and must be excluded, whereas SSH encrypts all session payload and authentication.
3
Match SSH to its default network port
SSH operates by default over TCP port 22.
CompTIA Core 2 standards require associating key operational security tools with their standard TCP/UDP port assignments.

Key Concept

SSH protocol security characteristics and default port assignment
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Topics

Remote Access Technologies and Tools

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