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Difficulty: EasyCommon Ports and Protocols

A network technician is configuring an interface access list on a router to allow secure, encrypted command-line management connections to a remote Linux server. Which transport protocol and port combination must be permitted to allow Secure Shell (SSH) traffic?

  1. TCP port 22Answer
  2. B
    TCP port 23
  3. C
    UDP port 22
  4. D
    TCP port 80

Answer

TCP port 22 is the standard port and protocol for Secure Shell (SSH) remote management traffic.
Secure Shell (SSH) uses TCP port 22 by default to provide secure, encrypted command-line management traffic over a connection-oriented session.

Step-by-Step Solution

1
Identify the application protocol requested in the scenario.
The scenario specifies Secure Shell (SSH) for encrypted command-line management.
Determining the target application protocol is necessary to select the correct transport protocol and port number.
2
Determine the transport layer protocol requirement.
SSH requires a reliable, connection-oriented session provided by TCP.
Interactive terminal communications rely on error checking and session establishment.
3
Map SSH to its well-known default port number.
SSH uses TCP port 22 by default.
IANA assigns port 22 specifically for secure terminal access via SSH.

Key Concept

Standard Default Ports and Protocols
Estimated Time:45s
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Topics

Common Ports and Protocols

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