Chapter 7.3 Network security

Question 1

What are firewalls

Answer 1

Firewalls are designed purely to prevent unauthorized access. A firewall can come in two form - either hardware or software- but is often combined into one device.

Question 2

How do firewalls work?

Answer 2

At their most basic, firewalls work like a filter between your computer/network and the Internet. You can program what you want to get out and what you want to get in. Everything else is not allowed. There are several different methods firewalls use to filter out information, and some are used in combination.

Question 3

What is Encryption?

Answer 3

Encryption is the name given to the converting of data into a code by scrambling or encoding it.

Question 4

Advantages of software firewalls

Answer 4

1 Cheaper
2 Ideal for personal or home use
3 Easy to configure or reconfigure

Question 5

Disadvantages of software firewalls

Answer 5

1 Takes up system resources
2 Sometimes difficult to remove or un-install a firewall completely.
3 Not suitable where response times are critical.

Question 6

Advantages of hardware firewalls over software firewal

Answer 6

1 Speed: Normally, the hardware firewalls are tailored for faster response times, and hence handle more traffic loads.
2 Security: A firewall with its own operating system (proprietary) is less prone for attacks. This in turn reduces the security risk. In addition, hardware firewalls have enhanced security controls.
3 No Interference: A box, that is separated from other network components can be managed better, and does not load or slowdown other applications. The box can be moved, shutdown, or reconfigured with minimal interference to the network.

Question 7

Disadvantage of hardware firewalls

Answer 7

1 Cost. Normally, a dedicated hardware firewall costs more than a software firewall.
2 Difficult to install, and upgrade.
3 Takes up physical space, and involves wiring.