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Difficulty: EasyCommon Ports and Protocols

A network administrator needs to configure edge firewall rules to allow remote terminal access over an encrypted command-line interface as well as secure web traffic to an internal web server. Which TWO standard protocol and port combinations must be permitted through the firewall?

  1. SSH over TCP port 22Answer
  2. HTTPS over TCP port 443Answer
  3. C
    Telnet over UDP port 23
  4. D
    HTTP over TCP port 443

Answer

The firewall rules must permit SSH traffic using TCP port 22 and HTTPS traffic using TCP port 443.
SSH on TCP port 22 meets the requirement for secure command-line administration, while HTTPS on TCP port 443 meets the requirement for encrypted web application access.

Step-by-Step Solution

1
Identify the required secure service for remote command-line access.
SSH provides encrypted shell access using default TCP port 22.
Telnet is unencrypted on TCP port 23, making SSH on TCP port 22 the correct choice.
2
Identify the required secure protocol for web server access.
HTTPS encrypts web communications using default TCP port 443.
Standard HTTP uses unencrypted TCP port 80, whereas HTTPS uses TCP port 443.

Key Concept

Standard default port assignments for secure network management and web services.
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Topics

Common Ports and Protocols

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