A firewall is an important network perimeter device. It isolates external and internal networks and provides a way to set rules and policies to allow/disallow network traffic.
Encryption is the process of encoding information in such a way that attackers or hackers cannot read it,but authorised party can easily read or access.data confidentiality is important feature of. Due to this we can also identify sender of data.
Physical security protect your network from natural and human-made disasters.It can also protect the network from hackers,terrorists and changing equipment configurations. It also protect resources from natural disasters such as fires,floods storms, and earthquakes.
Packet filters can be set up on routers,servers , and firewalls to allow or disallow packets from particular addresses or services. Packet filters protect network resources from unauthorized use, theft, destruction, and DoS attacks.
Intrusion Detection and Prevention Systems
An intrusion detection system (IDS) finds malicious events and give noticification to administrator, using email, paging, or logging of the occurrence.Some IDS devices give information to a central database that correlates information from multiple sensors to give an administrator an overall view of the real-time security of a network.