Network Layer Security: Implementing Firewalls with Access Control Lists (ACLs)

Which of the following items would be implemented at the Network layer of the security model? A)Firewalls using ACLs. B)Network plans. C)Penetration testing. D)Wireless networks.

The item that would typically be implemented at the Network layer of the security model is A) Firewalls using Access Control Lists (ACLs).

The Network layer is responsible for providing end-to-end communication between devices on different networks. It handles tasks such as packet routing, IP addressing, and network segmentation. Firewalls are security devices that operate at the Network layer and are primarily responsible for enforcing security policies and controlling the flow of network traffic. Firewall rules can be configured using Access Control Lists (ACLs) to specify which traffic is allowed or blocked based on factors such as source and destination IP addresses, ports, and protocols.

Network plans (B) refer to the strategic and tactical planning of network infrastructure and operations, and although they are important for network security, they do not directly implement security measures.

Penetration testing (C) is a security assessment technique that involves testing a system’s vulnerabilities by simulating attacks. While penetration testing is an important security practice, it is typically conducted at higher layers of the security model, such as the Application layer or the Presentation layer, rather than at the Network layer.

Wireless networks (D) refer to network connections that utilize wireless communication technologies such as Wi-Fi. While securing wireless networks is crucial, this is more related to the data link layer (Layer 2) or the physical layer (Layer 1) of the security model rather than the Network layer.

So, the correct answer is A) Firewalls using ACLs.

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