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: -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.
Detailed explanation-2: -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-3: -Firewalls. Packet filtering A network layer firewall or packet-filtering firewall works at the network layer of the Open Systems Interconnection (OSI) model and can be configured to deny or allow access to specific ports or Internet Protocol (IP) addresses.
Detailed explanation-4: -The most significant protocol at layer 3 (also called the network layer) is the Internet Protocol, or IP. IP is the standard for routing packets across interconnected networks–hence, the name internet. It is an encapsulating protocol similar to the way Ethernet is an encapsulating protocol.
Detailed explanation-5: -Layer 7 firewalls are more advanced than layer 3 firewalls. They can look into the contents of data packets coming into and out of your business’s network to determine whether they are malicious. If a data packet contains malware, the layer 7 firewall can reject it.