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Question

Difficulty: EasyVirtual Private Networks and Remote Access Security

A system administrator is configuring a secure remote access solution using an SSL/TLS VPN to allow telecommuters to access internal network applications. Which transport layer protocol and default port number are used by an SSL/TLS VPN connection?

  1. TCP port 443Answer
  2. B
    UDP port 500
  3. C
    TCP port 22
  4. D
    UDP port 1701

Answer

TCP port 443 is the standard protocol and port used for SSL/TLS VPN connections.
SSL/TLS remote access VPNs utilize Transport Layer Security, which operates over TCP port 443 by default. Because TCP port 443 is also used for standard encrypted web browsing (HTTPS), it easily traverses firewalls and Network Address Translation (NAT) devices.

Step-by-Step Solution

1
Identify the VPN technology specified in the scenario.
The scenario specifies an SSL/TLS-based remote access VPN.
Determining the underlying protocol suite identifies the required transport protocol and port assignment.
2
Associate SSL/TLS with its standard transport layer port number.
SSL/TLS uses TCP port 443.
Port 443 is the established standard port for Transport Layer Security (TLS) traffic.

Key Concept

SSL/TLS VPN Transport Port Characteristics
Estimated Time:45s
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Topics

Virtual Private Networks and Remote Access Security

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