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Q: A ............. is a computer, appliance, or router that sits between the trusted and untrusted systems.
  • A. hub
  • B. swithch
  • C. firewall
  • D. bridge
Correct Answer: Option C - A firewall is a part of a computer system or network, which is designed to prevent unauthorized used and to allow authorized communication (Passive System). It is a device or set of tools, designed in a way that permits, accepts, encrypts, decrypts or proxies and excludes computer traffic among other security domains based on many rules and other standards. Firewalls can be implemented in hardware or software or a combination of both. There are many types of firewall techniques. Such as- (1) Packet filter, (2) Application level gateway, (3) Circle level gateway, (4) Proxy Server.
C. A firewall is a part of a computer system or network, which is designed to prevent unauthorized used and to allow authorized communication (Passive System). It is a device or set of tools, designed in a way that permits, accepts, encrypts, decrypts or proxies and excludes computer traffic among other security domains based on many rules and other standards. Firewalls can be implemented in hardware or software or a combination of both. There are many types of firewall techniques. Such as- (1) Packet filter, (2) Application level gateway, (3) Circle level gateway, (4) Proxy Server.

Explanations:

A firewall is a part of a computer system or network, which is designed to prevent unauthorized used and to allow authorized communication (Passive System). It is a device or set of tools, designed in a way that permits, accepts, encrypts, decrypts or proxies and excludes computer traffic among other security domains based on many rules and other standards. Firewalls can be implemented in hardware or software or a combination of both. There are many types of firewall techniques. Such as- (1) Packet filter, (2) Application level gateway, (3) Circle level gateway, (4) Proxy Server.