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Network Security

Network Security consists of the supplies and policies adopted by a network administrator to prevent and monitor unlawful access, misuse, notification or a denial of a computer network and its resources. It also includes the authorization of access to data in a network.


  • It is generally imposed by assigning a User ID and Password for the users and potential users have to register themselves for the same.
  • It not only protects the network but also oversees operation being done.
  • It can also be said as a unusual field in computer networking that cares about the computer network and its infrastructure.
  • It is modelled to protect the usability, reliability, integrity and safety of the network and data.
  • A well modelled network security scheme targets a variety of threats and potential threats. It stops them from entering the network.
  • It is generally handled by the network administrator.
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Block Diagram

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The very familiar and most common network security threats include

  • Viruses, worms and Trojans.
  • Spyware, Adware.
  • Zero-hour attacks.
  • Hacker attacks.
  • Denial of service attacks.
  • Data interception theft.
  • Identity theft.


  • Antivirus or Antispyware.
  • Firewall.
  • Intrusion Prevention System.
  • Virtual Private Network.


There are several types of attacks that are currently used by the intruders / attackers / hackers to breach the security in networks.

  • Active attack.
  • Passive attack.
  • Distributed attack.
  • Insider attack.
  • Close-in attack.
  • Phishing attack.
  • Hijack attack.
  • Spoof attack.
  • Buffer overflow.
  • Exploit attack.
  • Password attack.

Real Time Examples

  • Authentication Applications.
  • IP Security.
  • Email Security.
  • Anti Virus Protection.
  • Browser Security (Secure browsing).
  • Web security Standards.