Chapter 6, Problem 1RQ

Explanation of Solution

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.

Trusted network and untrusted network:

The untrusted network is the common Internet or another part of public network, while the trusted network is usually a privately owned network or organization’s network.

Relationship among Firewall, trusted network and untrusted network:

• The relationship is that information is only restricted by firewall via particular spaces called “ports”.
• Firewall prevents the untrusted or unwanted network connections from outside, and filters it to the trusted network which lies on the bounds of the firewall to ensure that it’s legitimate.