Intrusion detection systems are devices that monitor malicious activities in a network, log information about such activities and take active steps to stop them, and then report them. Such network security devices as routers, crypto-capable routers, virtual private network gateways, secure modems and intrusion detection systems are also very popular.
Firewall can be software or hardware appliance, or include together hardware and software devices, most computers use software-based firewalls to secure their data from Internet threats, many routers also contain the firewall components. The most popular network security devices are firewalls - network security systems which establish a barrier between an internal network and the Internet, effectively manage and regulate the network traffic based on some protocols.
Unified Threat Management (UTM) devices, such as firewalls, content filtering, web caching, which serve as all-in-one security devices. preventative devices - penetration testing devices and vulnerability assessment appliances, which scan the networks and identify potential security problems. 
passive devices, such as intrusion detection appliances, which identify and report on unwanted traffic. active devices - firewalls, antivirus scanning devices, content filtering devices, which block the surplus traffic. There are few types of network security devices: It is necessary to protect the network at all of its entry points, the most important factors in network security are encryption, reliable passwords, the use of antivirus software and modern advanced network security devices. The network security includes assurance of the limited access to sensitive information, the protection from unauthorized access, risks and potential security threats, and enhancement of network performance. Assurance of network security is one of the most important moments for safe and correct working of the computer systems and networks.
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