COMPUTER NETWORKING

Detailed explanation-1: -You have a router that is configured as a firewall. The router is a layer 3 device only. Which of the following does the router use for identifying allowed or denied packets? (a router acting as a firewall on layer 3 is capable of making forwarding decisions based on the ip address.

Detailed explanation-2: -Generally, most firewalls allow you to set rules that determine which traffic is allowed into or out of your network. Example: You could configure the firewall to allow only traffic from specific IP addresses, block certain ports, and restrict access to particular services.

Detailed explanation-3: -A router is a commonly utilised Layer 3 device. Operating at Layer 3, a router will inspect the IP and IPX addresses of incoming data packets. After determining the packet source, the router will then make routing decisions based on the enclosed destination address and quality of service specifications.

Detailed explanation-4: -There are three common types of firewalls, the packet-filtering router, the Application-Level Gateway, and the Circuit-Level Gateway. A packet-filtering router examines the packets and decides whether they could flow through.

Detailed explanation-5: -Packet-filtering firewalls operate at the network layer (Layer 3) of the OSI model. Packet-filtering firewalls make processing decisions based on network addresses, ports, or protocols. Packet-filtering firewalls are very fast because there is not much logic going behind the decisions they make.