Why we need firewall system in computer networks. Explain the different types of firewalls?
Answers
Answer:
Firewall is a systems design to prevent unauthorized access to or f from the private network you can implement a Firewalls in either hardware or software form or a combination of both Firewall prevent unauthorized internet user from accessing private networks connected to the internet especially Intranet.
There are 5 types of firewalls.
- packet filtering firewalls
- circuits level gateways
- stateful inspection firewalls
- application level gateway
- NextGen firewalls
Explanation:
Packet filtering firewalls:
Packet filtering firewall operate in line at Junction points where devices such as routers and switches do their works.
Circuits level gateways:
using any other relativity quick way to identify malicious content, circuit level gateway monitor TCP handshake and other network protocols session initiation messages across the network.
Stateful inspection firewall:
state aware devices, on the other hands not only examine each packets but also keep track of whether or not there packets is the part of an established TCP or other network session.
Application level gateways:
This kind of device Technically a proxy and something refer to as proxy firewalls combination type of attribution of packet filtering firewalls with those of circuit level gateway.
Net gen firewalls:
A typical NGFW combines packet inspection with stateful inspection and also include some variety deep packet inspection as well as other network security system,such as intrusion detection or prevention, malware filtering and anti viruses.