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Question

Difficulty: EasyNetworking Ports and Protocols

A network administrator is setting up access control rules on a firewall to permit secure, encrypted web browsing and secure inbound email retrieval via IMAP over SSL/TLS. Which TWO of the following default TCP ports must be allowed through the firewall to enable these services?

  1. TCP port 443Answer
  2. TCP port 993Answer
  3. C
    TCP port 80
  4. D
    TCP port 143

Answer

The correct choices are TCP port 443 for secure web browsing (HTTPS) and TCP port 993 for secure email retrieval (IMAPS).
HTTPS operates on TCP port 443 to secure web browsing sessions, while IMAPS operates on TCP port 993 to securely retrieve emails over an encrypted connection.

Step-by-Step Solution

1
Identify the standard port for secure web communications.
HTTPS uses TCP port 443.
Web traffic requiring SSL/TLS encryption uses HTTPS on port 443 instead of unencrypted HTTP on port 80.
2
Identify the standard port for secure IMAP email retrieval.
IMAPS uses TCP port 993.
IMAP traffic secured with SSL/TLS encryption uses port 993 instead of unencrypted IMAP on port 143.

Key Concept

Default port numbers for secure network protocols (HTTPS and IMAPS)
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Topics

Networking Ports and Protocols

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