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Difficulty: EasyVirtual Private Networks and Remote Access Security

A network technician is configuring a remote access solution for mobile workers to securely connect to internal enterprise resources. The technical requirements specify that the security protocol suite must operate at the Network layer (Layer 3) of the OSI model to authenticate and encrypt all IP packets passing through the tunnel. Which of the following protocols should the technician implement?

  1. IPsecAnswer
  2. B
    TLS
  3. C
    SSH
  4. D
    PPTP

Answer

IPsec is the correct protocol suite because it functions at the OSI Network layer (Layer 3) to authenticate and encrypt all IP packet payloads and headers.
IPsec (Internet Protocol Security) operates natively at Layer 3 (the Network layer) of the OSI model. By running at Layer 3, IPsec can secure and encrypt all upper-layer protocol traffic (such as TCP and UDP) seamlessly without requiring application-specific configurations.

Step-by-Step Solution

1
Identify the OSI layer constraint specified in the prompt requirement.
The target protocol must operate directly at Layer 3 (Network layer).
Layer 3 protocols can encrypt and encapsulate full IP packets regardless of upper-layer applications.
2
Evaluate the listed VPN and remote access protocols against their operating layer.
IPsec operates at Layer 3; TLS operates at Layer 4/7; SSH operates at Layer 7; PPTP encapsulates Layer 2 frames.
Only IPsec meets the exact OSI Layer 3 architectural requirement.

Key Concept

IPsec Layer 3 Operation and Encapsulation
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Topics

Virtual Private Networks and Remote Access Security

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