Chapter 6, Problem 9RQ

Program Plan Intro

Firewall:

A firewall is security software which imposes a set of protocols to prevent specific types of data from moving among trusted and untrusted level of networks.

• An example of trusted network is “Organization’s Internet”. Similarly for untrusted network is “Internet”.
• A list of firewalls that are commonly used as follows:
  • Application layer proxy firewalls
  • Hybrid firewalls
  • Packet filtering firewalls
  • Media access control layer firewalls