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Firewall

Firewall

WHAT IS IT ?

  • A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules.

  • It is recognized as the first line of defense in securing sensitive information.

  • A firewall may be implemented using hardware, software, or a combination of both.

  • Firewalls are often categorized as:

  • Network Firewalls 

  • Host-based-firewall

Network Firewalls:

  • Network firewalls filter traffic between two or more networks and run on network hardware. 

Host-based Firewalls:

  • Host-based firewalls run on host computers and control network traffic in and out of those machines.

Internet

Network Firewall

Internet

Firewall

​Network security system to filtering out unwanted network traffic.

Host-based Firewall

Hardware Firewall

Software Firewall

  • When an undesired internet package reaches Security Integrated Component at the entrance of the automation cell the that will deny entrance to the internet package.

  • If an identifiable package intended for a node of the automation cell reaches the security integrity, it let the package pass.

  • The package reaches the node and can be processed there.

  • The following features of an Ethernet package will be checked.

  • There are two types of firewalls:

  • Hardware Firewalls

  • Software Firewalls

Hardware Firewalls​​

  • Hardware Firewalls are automatically built into the routers that most of us are using today

  • One common type of hardware firewall allows you define the blocking rules, such as by IP address, by TCP or UDP of the port.

  • So unwanted ports and IP addresses are forbidden. 

  • Software-based protections function by monitoring the integrity of flowing traffic processes through variable such as:

  • incoming and destination IP addresses

  • trasfer times

  • download sizes

  • killing connection 

  • monitor outgoing traffic as well as incoming 

  • blocking programs like IP spoofing.

  • When people talk about examples of hardware firewalls, it actually referring to the router.

  • Here are some top firewall devices in the market.

WatchGuard Firebox T10

NETGEAR ProSecure UTM10

McAfee Next Generation Firewall

​Dell SonicWALL TZ 105

​​Software Firewalls

  • Software firewalls are installed on your computer.

  • Allows us some control over its function and protection features.

  • A software firewall will protect your computer from outside attempts to control or gain access your computer.

  • It could also provide protection against the most common Trojan programs or e-mail worms.

  • The downside to software firewalls is that they will only protect the computer they are installed on, not a network.

  • Here are some methods, Firewalls generally use:

  • Packet Filtering Firewall: 

  • When a data packet arrives at packet filtering firewall, it only checks the senders, receivers IP address, and the port number present in the data packet.

  • This firewall is presented in a router.

  • It does not check the payload of a data packet.

  • Application/Proxy Firewall: ​

  • It hides us from internet hacker by not exposing our IP address.

  • Hardware Firewall: It combines Packet filtering firewall and Application firewall in series to enhance the security.

  • Here are examples of software firewalls.

Avast Internet Security

Comodo Internet Security

Intego VirusBarrier

Windows Firewall

NetLimiter

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