COMPUTER THREATS SECURITY
WHAT IS A FIREWALL IN NETWORK SECURITY
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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: -In the basic form, packet filters operate at Layer 3 (Network) of the Open Systems Interconnect (OSI) model. This provides network access control based upon information contained in the packet.
Detailed explanation-2: -Packet-filtering firewalls operate at the network layer (Layer 3) of the OSI model. Packet-filtering firewalls make processing decisions based on network addresses, ports, or protocols.
Detailed explanation-3: -Stateless Firewall (Static Packet Filtering) A stateless firewall is the most basic kind-it’s basically a packet filter that operates on OSI layers 3 and 4. This is the most basic type of network perimeter firewall.
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.