Answer :
A router that serves as a layer 3 firewall has the ability to decide how to forward traffic based on the IP address.
The ideal tool to use when trying to shield your private network from a public, untrusted network is a firewall. Firewalls are used to regulate the flow of traffic into and out of your trusted network environment. Inbound and outbound access to a predetermined IP address is permitted by static packet filtering. An access control list with a one-way rule allowing or blocking traffic to and from the server is present on a stateful firewall, which also operates on OSI layers 3 and 4, when it detects incoming traffic. On layers 3 and 4 of the OSI model, a firewall typically operates. TCP and UDP operate on Layer 4, the Transport Layer, while Layer 3 is the Network Layer, where IP operates. The OSI has been advanced by several firewalls nowadays.
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