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Question

Difficulty: MediumNetworking Ports and Protocols

A systems administrator is setting up outbound traffic rules on an enterprise edge firewall to allow internal web servers to connect to external API gateways for encrypted transaction processing. Which transport layer protocol and port number must be allowed through the firewall to support standard secure web services?

  1. TCP port 443Answer
  2. B
    TCP port 80
  3. C
    UDP port 443
  4. D
    TCP port 8080

Answer

TCP port 443 is the standard protocol and port for secure web communications (HTTPS).
HTTPS (Hypertext Transfer Protocol Secure) provides encrypted web communication using TLS/SSL and operates over TCP port 443 by default.

Step-by-Step Solution

1
Identify the required network service requirements.
The scenario specifies a requirement for encrypted web traffic (HTTPS) connecting to API gateways.
Security requirements mandate encryption in transit for transaction processing.
2
Map HTTPS to its standard transport layer protocol and port.
HTTPS uses TCP as its connection-oriented transport protocol and standard port 443.
TCP guarantees reliable delivery for application payload, while port 443 is the standard well-known port for HTTPS.

Key Concept

Hypertext Transfer Protocol Secure (HTTPS) over TCP 443
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Topics

Networking Ports and Protocols

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