Chapter 11, Problem 23Q

Explanation of Solution

Firewall:

• Firewall is a software- or hardware-based network security device; it limits incoming and outgoing data traffic based on set of rules.
• It allows to access the internet but limits to access the internal data by the outsiders.
• It will not be able to provide the protection against the inside data theft.
  • But, it protects the computers against unauthorized access, virus or malicious applications from the outer access.

Types of firewall:

The basic types of firewall are as follows:

Packet filter:

• It is a first-generation firewall and simple in design...