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: -Firewalls typically work on the network layer, the transport layer.
Detailed explanation-2: -A layer 3 firewall is a type of firewall that operates on the third layer of the Open Systems Interconnection (OSI) model. Also known as the network layer, the third layer of the OSI model is the same where routers operate.
Detailed explanation-3: -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-4: -Layer 3 (Network): This layer determines how data is sent to the receiving device. It’s responsible for packet forwarding, routing, and addressing.
Detailed explanation-5: -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.