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Question

Difficulty: EasyRemote Access Technologies and Tools

A IT technician is reviewing network security configurations to disable insecure legacy management services across the corporate network. Which port should be blocked on the firewall to prevent unencrypted Telnet remote access connections?

  1. Port 23Answer
  2. B
    Port 22
  3. C
    Port 3389
  4. D
    Port 80

Answer

Port 23 is the default port for Telnet.
Port 23 is the standard default port for Telnet. Telnet transmits all data, including authentication credentials, in unencrypted cleartext, making it insecure and leading administrators to block port 23 in favor of SSH.

Step-by-Step Solution

1
Identify the protocol mentioned in the scenario.
The scenario asks to disable unencrypted Telnet access.
Telnet is an older remote administration protocol that transmits data in cleartext.
2
Match Telnet to its standard default network port.
Telnet operates over TCP port 23.
Standard port assignments dictate that Telnet uses port 23, while SSH uses port 22 and RDP uses port 3389.

Key Concept

Standard default port numbers for remote access protocols (Telnet vs. SSH vs. RDP)
Estimated Time:45s
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Topics

Remote Access Technologies and Tools

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