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Difficulty: EasyCommon Ports and Protocols

A network administrator needs to configure a firewall rule to allow secure, encrypted command-line administration of a remote Linux server using Secure Shell (SSH). Which transport protocol and port number combination must be permitted in the firewall rule?

  1. TCP port 22Answer
  2. B
    UDP port 22
  3. C
    TCP port 23
  4. D
    TCP port 443

Answer

TCP port 22
Secure Shell (SSH) is the standard network protocol used for secure, encrypted remote command-line login and system administration. It operates over TCP port 22.

Step-by-Step Solution

1
Identify the protocol requested in the network scenario.
The requirement specifies Secure Shell (SSH) for encrypted command-line administration.
SSH provides encrypted shell access to remote servers.
2
Determine the transport protocol and default well-known port assigned to SSH.
SSH uses TCP port 22.
TCP ensures reliable connection-oriented delivery, and 22 is the standard IANA port for SSH.

Key Concept

Common Ports and Protocols - Secure Shell (SSH)
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Topics

Common Ports and Protocols

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