Abstract-Security is an important and serious issue for every type of network. Many network environments specially those where computers are used as nodes are prone to an increasing number of security threats in the form of Trojan worm attacks and viruses that can damage the computer systems, servers and communication channels. Though Firewalls are used as a necessary security measure in a network environment but still different types of security issues keep on arising. In order to further strengthen the network from intruders, the concept of intrusion detection system (IDS) and intrusion prevention system (IPS) is gaining popularity. IDS is a process of monitoring the events occurring in a computer system or network and analyzing them for sign of possible incident which are violations or imminent threats of violations of computer security policies or standard security policies. intrusion prevention system (IPS) is a process of performing intrusion detection and attempting to stop detected possible incidents. This study aims to identify different types of Intrusion Detection and Prevention techniques discussed in the literature.