Network security refers to a documentation giving users an overview of the security risks and countermeasures associated with internet connectivity. Basically it refers to an organization's strategy and provisions for ensuring the security of all the network traffic and its assets. Network security is rapidly gaining prominence because of excessive threats to the networks. So it demands very strong defensive mechanism system be it for small or a bigger network. Network security increases work productivity, reduces costs and prevents unauthorized access to the data and its misuse.