FireWall

Features and Benefits:

One of the most visible benefits of firewalls is the ability to control your system's.
Entry points and stop virus attacks.
The cost of damage from a virus attack on your systems could be immeasurably high, depending on the type of virus.

Prevents Hacking, Stops Virus Attacks, Updated Threat Protection, Consistent Network Speed.
Proactively addressing the security concerns of your business and your network now can pay dividends of time savings.

Firewall in Computer Network

A firewall is a network security device, either hardware or software-based, which monitors all incoming and outgoing traffic and based on a defined set of security rules it accepts, rejects or drops that specific traffic.

Accept : allow the traffic
Reject : block the traffic but reply with an “unreachable error”
Drop : block the traffic with no reply

How Firewall Works

Firewall match the network traffic against the rule set defined in its table safe or not
Once the rule is matched, associate action is applied to the network traffic
Most of the traffic which reaches firewall uses one of these three major Transport Layer protocols- TCP, UDP or ICMP

All these types have a source address and destination address
A firewall establishes a barrier between secured internal networks and outside untrusted network, such as the Internet