NETWORK SECURITY
FIREWALLS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Layer 3
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Layer 5
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Layer 7
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Layer 2
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Detailed explanation-1: -A transparent firewall operates at Layer 2 of the OSI model, the data link layer.
Detailed explanation-2: -Firewalls deployed in Layer 2 mode provide the most transparent method for integrating with existing routing and IP designs as well as existing services-load balancers, etc. In the case of Layer 2 firewalls, the preservation of existing server gateways, IP subnets, and addressing is preserved.
Detailed explanation-3: -With transparent Layer 2 bridging: All network traffic is delivered using Layer 2 lookups. The source MAC address is propagated in connection requests. The bridged network nodes cannot locally communicate with the interface. The bridge requires a separate interface that makes it accessible for configuration.
Detailed explanation-4: -A firewall generally works at layer 3 and 4 of the OSI model. Layer 3 is the Network Layer where IP works and Layer 4 is the Transport Layer, where TCP and UDP function. Many firewalls today have advanced up the OSI layers and can even understand Layer 7 – the Application Layer.
Detailed explanation-5: -Firewalls typically work on the network layer, the transport layer. However, some are also capable of working as high as the application layer, Layer 7.