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Which of the following option correctly describes use of firewall?
1. Preventing unauthorized access
2. Data sharing between different servers
3. Fast web browsing
4. Preventing computer hardware from any damage
5. None of the above

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Correct Answer - Option 1 : Preventing unauthorized access

The correct answer is Preventing unauthorized access.

  • A firewall is a kind of security-conscious type of hardware or software that stays between the computer and our network with a primary task: preventing malicious software from reaching us.
  • In other words, we can say that the firewall works like a security guard between the Internet and our local area network (LAN). All network traffic passing through the LAN must face the firewall, which restricts unauthorized access to the network.

 

  • Following are the types of Firewalls -
    1. Packet-filtering firewall: It checks every packet that passes the firewall and examines the packet as per the set of rules that the user sets up. If the packet gets to pass the test, it’s allowed to go through. If the packet fails to pass the test then it is rejected. Packet filters are the most inexpensive variety of firewalls. That is why packet-filtering firewalls are used very commonly.
    2. Stateful packet inspection (SPI): It is installed in accordance with simple packet filtering. A firewall having Stateful packet checking looks at packets in clusters instead of doing individually. It maintains the record of all those packets have crossed through the firewall and can create patterns that indicate unauthorized entry.
    3. Deep packet inspection (DPI): It is the actual data of the packets is checked so viruses, spam, and other harmful content can be restricted. DPI also enables practices, such as data mining, eavesdropping, and content censorship, which make its way through a controversial subject.

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