Summary

Summary

Security methods in a computer network can be applied in the application layer, transport layer, and IP layer.

IP security (IPSec) is a collection of protocols designed by the IETF to provide security for an internet packet.

The Authentication Header protocol provides integrity and message authentication. The Encapsulating Security Payload protocol provides integrity, message authentication and privacy

The Transport Layer Security provides security at the transport layer through its handshake protocol and data exchange protocol.

Pretty Good Privacy (PGP) provides security for the transmission of email.

A firewall ia a router installed between the internal network of an organization and the rest of the internet.

Packet-filter firewall blocks or forwards packets based on information on the network and transport layers.

A proxy firewall blocks or forwards packets based on information in the application layer.