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The security network team is trying to implement a firewall capable of operating only in the session layer, monitoring the TCP inter-packet link protocol to determine when a requested session is legitimate or not. Using the type of firewall,they could be able to intercept the communication, making the external network see that the firewall is the source, and facing the user, who responds from the outside is the firewall itself. They are just limiting a requirements previous listed, because they have already have a packet filtering firewall and they must add a cheap solution that meets the objective. What kind of firewall would you recommend?
Correct Answer: C
A Circuit Level Gateway operates at the session layer of the OSI model. It monitors the TCP handshake to ensure that the session is legitimate and can intercept the communication. This type of firewall does not inspect the packets themselves but rather ensures that the connection is valid. It can be seen as a middleman that relays TCP connections between the user and the external network, making it appear as if the firewall is the source or destination of the communication. This is a cost-effective solution that complements the existing packet filtering firewall by adding session-level control without the need for deep packet inspection or application-level gateways, which can be more resource-intensive.