Internet connection has become very popular now a days. Connecting network to the Internet provides access to tremendous amount of information, allows sharing information on an improbable scale. However, the communal nature of the Internet, which has so many benefits, also offers malicious users easy access to numerous targets. Many people are fighting against attackers trying to find out the ways to protect the information. Currently, there are many different types of network security systems, ids, anti-virus systems, firewalls, anti malware software’s. However, these available mechanisms lack ability for defense against network attacks which uses vulnerabilities of network system. Attacks and vulnerabilities can be classified into taxonomy, and the taxonomy along with applicable methodologies can be used to predict future attacks. There are many approaches to categories vulnerabilities into taxonomy. One way is to classify by location of vulnerability in object model. These classifications attempt to categories vulnerabilities according to which model object or entity they belong to. This paper aims to categories vulnerabilities and attacks by their location in the Network Layer of ISO OSI . Attacks which happen on the network layer are many and more dangerous for the network compared with attacks of the other layers. In this Paper attacks at Network Layer has been classified by their Attack Vector and their Impact on the Attacks.

Network Layer Attacks