NETWORK LAYER
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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block HTTP traffic during 9:00PM and 5:00AM
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block all ICMP traffic
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stop incoming traffic from a specific IP address but allow outgoing traffic to same IP
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block TCP traffic from a specific user on a specific IP address on multi-user system during 9:00PM and 5:00AM
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Detailed explanation-1: -A layer-4 firewall cannot block TCP traffic from a specific user on a multi-user system during a specific time range, such as 9:00PM to 5:00AM. This is because a layer-4 firewall cannot distinguish between different users on a multi-user system based on TCP traffic alone.
Detailed explanation-2: -A layer 7 firewall, as the name suggests, is a type of firewall that operates on the OSI model’s 7 layers. The seventh layer of the OSI model, often known as the application layer, allows for more advanced traffic-filtering rules.
Detailed explanation-3: -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.