COMPUTER NETWORKING

Detailed explanation-1: -Typically, circuit-level firewalls are implemented as security software or pre-existing firewalls. Like packet-filtering firewalls, these firewalls do not check for actual data, although they inspect information about transactions.

Detailed explanation-2: -Stateful Inspection Firewall A combination of Packet filtering and circuit level Firewalls. These Firewalls monitor all active sessions or connections, giving them the most power in evaluating whether networks packets should be permitted or blocked.

Detailed explanation-3: -A packet-filtering firewall examines packets in isolation and does not know the packet’s context. A stateful inspection firewall examines network traffic to determine whether one packet is related to another packet.

Detailed explanation-4: -Static Packet Filter 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.