Question

Filters are used in

• A. firewall
• B. for error detection
• C. both $1$ and $2$
• D. None of these

Answer 1

Answer: (C)

both $1$ and $2$

Filters are used in firewall and for error detection.

Packet filtering is a firewall technique used to control network access by monitoring outgoing and incoming packets and allowing them to pass or halt based on the source and destination Internet Protocol (IP) addresses, protocols and ports.

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the internet.