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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Sequence number
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Destination address of a packet
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Port number
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Acknowledgement number
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Source address of a packet
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Detailed explanation-1: -The access control functionality of a packet filter firewall is governed by a set of directives collectively referred to as a rule set. In the basic form, packet filters operate at Layer 3 (Network) of the Open Systems Interconnect (OSI) model.
Detailed explanation-2: -Generally, most firewalls allow you to set rules that determine which traffic is allowed into or out of your network. Example: You could configure the firewall to allow only traffic from specific IP addresses, block certain ports, and restrict access to particular services.
Detailed explanation-3: -Explanation: Packet Filtering Firewalls are applied within routers which connect the internal Network system with the outside network using the internet. It works effectively if the internal network is smaller in size.
Detailed explanation-4: -It monitors the incoming and outgoing packets in each TCP connection. For example, when a packet originates within the local network, the firewall keeps track of the destination address and allows traffic from the destination addressed to the source back onto the local network.