14.8.3 Firewall Facts

Question 1

What is a firewall?

Answer 1

A firewall is a device or software that monitors and filters inbound and outbound traffic on a network.

Question 2

What are the two types of firewalls?

Answer 2

A: Hardware (network-based) and Software (host-based).

Question 3

What is a hardware firewall.

Answer 3

A network-based device placed between the internet and internal networks for protection.

Question 4

What is a software firewall?

Answer 4

A host-based device installed on a single machine that protects only that device.

Question 5

What are firewall functions controlled by ?

Answer 5

Firewalls use a set of rules called an Access Control List (ACL) to allow or block traffic.

Question 6

What traffic can a firewall filter?

Answer 6

By type of traffic, ports, protocols, or source/destination addresses.

Question 7

What is packet filtering?

Answer 7

A firewall that checks the source/destination IP addresses and ports, blocking unwanted packets.

Question 8

What is a circuit layer gateway?

Answer 8

A firewall that scans traffic based on TCP or UDP transmission, allowing legitimate connections.

Question 9

What is an application-level gateway?

Answer 9

A firewall that inspects packet contents and allows or denies traffic based on the application used.