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Network security plays an important role in our today's world of internet. Now-a-days everything of our life is connected to the internet, so network security is more important. It is important in military, government, organizations, and even our daily life. So, we should have knowledge about the attacks. What types of the attacks should be happened. Having the knowledge, how the attacks are executed we can protect ourselves. Now different type of methods is adopted to bypass it. The structure of internet allowed to occur many threats itself. The entire field of network security is very huge and in changing stage. The range of the study enclose the current development in network security and attacks. This paper briefly outlines the concepts of network security, different attack methods which are used, as well as different defense mechanisms against them.