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Computer Security 2. (3 pts) Why can a packet filtering firewall not ensure that incoming traffic...

Computer Security

2. (3 pts) Why can a packet filtering firewall not ensure that incoming traffic corresponds to a previously established outgoing connection?

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Answer #1

Inspects each packet that passes through the firewall.
Accepts or rejects it based on a set of rules.
Two Types of Packet Filtering - Stateless Packet Inspection, Stateful Packet Inspection
Operates at network layer of OSI Model
Packet-filtering firewalls can block traffic entering and exiting a LAN.
If you have firewalls protecting your subnets, this can help contain the worm.
Packet-filtering firewall may accept or deny traffic according to specific criteria: Source and destination IP addresses, Source and destination ports, Flags set in the IP header (ACK or SYN), Transmissions that use the UDP or ICMP protocols, Packet's status as the first packet in a new data stream, Packet's status as inbound to or outbound from your private network
Cannot distinguish between a user who is trying to breach the firewall and a user who is authorized to do so. Hence,a packet filtering firewall not ensure that incoming traffic corresponds to a previously established outgoing connection.

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