Page 135 - DCAP309_INFORMATION_SECURITY_AND_PRIVACY

Unit 9: Firewalls

Notes
Figure 9.1: Firewall

Task Discuss the use of macros.

Did u know? The job of firewall is similar to a physical firewall that keeps a fire from
spreading from one area to the next.

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Caution If the comparison yields a reasonable match, the information is allowed through.
Otherwise it is discarded.
Self Assessment

Fill in the blanks:
1. A ........................ is simply a program or hardware device that filters the information
coming through the Internet connection into your private network or computer system.
2. Firewalls are frequently used to prevent ........................ Internet users from accessing private
networks connected to the Internet, especially intranets.
3. A ........................ is a small program that can copy itself to other computers.

9.2 Demilitarized Zone (DMZ)

In computer networking, Demilitarized Zone (DMZ) is a firewall configuration for protecting
local area networks (LANs).

In a DMZ configuration, most computers on the LAN run behind a firewall associated to a public
network like the Internet. One or more computers also run outside the firewall, in the DMZ.
Those computers on the outside intercept traffic and broker, asks for the remaining LAN, adding
an additional layer of defense for computers behind the firewall.

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