COMPUTER NETWORKING

Detailed explanation-1: -The static packet filtering firewall operates only at the network layer (layer 3) of the OSI model and does not differentiate between application protocols. This type of firewall decides whether to accept or deny individual packets, based on examining fields in the packet’s IP and protocol headers.

Detailed explanation-2: -Layer 3 firewalls filter traffic based on the TCP/IP stack. This approach is sometimes also referred to as packet filtering, because you’re essentially allowing and blocking individual network packets depending on where they originated and which ports they want to talk to.

Detailed explanation-3: -A packet filtering firewall is a network security technique that regulates data flow to and from a network. It is a security mechanism that allows packets to move across networks while controlling their flow through the use of a set of rules, protocols, IP addresses, and ports.

Detailed explanation-4: -Also known as the network layer, the third layer of the OSI model is the same where routers operate. Therefore, layer 3 firewalls are able to monitor and filter traffic using the same protocols as routers. They can scan traffic based on Internet Protocol (IP) address, port addresses and similar router-based protocols.

Detailed explanation-5: -What parameters can a layer 3 firewall ruleset use? IP source and destination address, protocol type, and port number.