Explain use of Firewall and Packet Filtering.

A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Its primary function is to establish a barrier between a trusted internal network and untrusted external networks, such as the internet, to prevent unauthorized access, cyber attacks, and threats.

Packet Filtering is a firewall technique used to control network access by monitoring outgoing and incoming packets and either allowing or blocking them based on source and destination IP addresses, protocols, or port numbers. Packet filters inspect each packet in isolation without context, making real-time decisions to permit or deny traffic.

Uses:

• Firewall:
  • Protects networks from unauthorized access and cyber threats.
  • Enforces security policies and controls traffic flow.
• Packet Filtering:
  • Enhances security by blocking potentially harmful packets.
  • Controls access to specific network resources based on predefined rules.

Together, firewalls and packet filtering are essential for maintaining network security and integrity.