Question

Firewall is used in communication network/system for protection from
1. Unauthorized attack
2. Data driven attack
3. Fire attack
4. Virus attack

Answer 1

Correct Answer - Option 1 : Unauthorized attack

The correct answer is Unauthorized attack.

• Firewall:
  • A Firewall manages the secure in-flow and out-flow of data in a device.
  • It monitors the network traffic and acts as a barrier between the trusted and untrusted networks. 
  • A firewall is used in communication networks/systems for protection from Unauthorized attacks.
  • The concept of a Firewall is important for people interested in understanding the network security aspect of a computer device and also for those looking forward to strengthening their Computer Awareness.
  • A Firewall is a security system to protect an internal network from unauthorized servers and networks based on predefined rules.
  • It acts as a barrier and only allows the secured network to send or receive data.

• Types of Firewall:
  • Packet Filtering Firewall:
    • It is one of the oldest types of Firewall.
    • This type of Firewall creates a checkpoint at the traffic router.
    • Only the secure and verified IP address or networks are allowed for the further flow of data.
  • Application Level Gateway Firewall:
    • It is also known as Proxy Firewall.
    • When the user connects with the destination server, it forms a connection with the application gateway.
    • The proxy then connects with the destination server and takes up the decision of forwarding the data packets.
  • Circuit Level Gateway Firewall:
    • This works as the Sessions layer of the OSI Model.
    • Using this, two Transmission Control Protocol (TCP) connections can be set up together.
    • It can easily let the flow of data packets continue without consuming major computer resources.
  • Stateful Inspection Firewall:
    • It is a combination of data packet inspection and TCP connection.
    • Until both the fields are verified, the information cannot be approved.
    • They are less straining for the computer resources.
    • However, they are a bit slow in comparison to other Firewalls.