Get to Know What is a Firewall
Although the word Firewall is derived from firefighting, the original meaning stands for a protection or a barrier created to prevent fire from entering the arena which is protected by the firewall. In the modern age of Information Technology, Firewall is a system installed at the server point of a network to act as a protective system between the computer network and the internet. The functions of the Firewall are multifarious and making a thorough study we come to know what is a Firewall.
Software and Hardware Firewall:
The basic job of the Firewall is to check the entry of any data entering or leaving your computer on the basis of its configuration. It analyses the incoming and outgoing data packets to prevent unwanted attack from unknown, unsecured and unreliable sources. It also helps the computer to get remote access to a network that has a certificate of authentication and login permission. What is a Firewall in terms of software and hardware?
The most commonly used Firewall is the software version which are installed in the computers to prevent unwanted entry of applications which may try to gain control of the computer. The software Firewall helps in web filtering and operates privacy controls of the PC.
Hardware Firewall is installed in routers for broadband connections and protects the machine of any local network by filtering the data packets. Firewall helps in the determination of the destination and the source. It allows or denies entry of any data by examining the header of the data packet.
Firewall Techniques:
What is a Firewall technique? There are four Firewall techniques to block those messages which do not fall within the purview of the security criteria.
- Application Gateway: This is a mechanism for application of security to different applications.
- Packet Filter: This is a technique where the Firewall allows or disallows any packet data to enter the mechanism based on the configuration.
- Circuit level gateway: This acts as a security measure for installation of Transmission Control Protocol and User Datagram Protocol connections.
- Proxy Server: Through this technique, all incoming and outgoing messages are intercepted thus protecting the network from unwanted entry of outside elements.
Basic Functions of a Firewall:
After knowing what is a firewall, we shall discuss the functions of the Firewall. Firewall is used for accessing the control of the network connections. Networks may be trusted, untrusted or partially trusted. The corporate LAN is a trusted network while the WAN and the DMZ interface are untrusted and partially trusted networks where outside elements have a gateway to access the PC irrespective of its nature. The security policies determine the services and the LAN is allowed access to the WAN and DMZ for certain specific services. Similarly, the WAN has an access to the WAN and DMZ and the DMZ has access to WAN. These accesses are based on certain services and those which are not allowed by the configuration are blocked.
The Firewall set up provides control of the LAN PCs connection to the WAN. It acts as the most dependable security from external threats and ensures proper utilization of the bandwidth which are expensive. Firewall allows speedy access to external and internal resources.
Firewall Devices:
What is a Firewall device? Installation of Firewall in Networking is absolutely necessary for security reasons. There are many Firewall devices like :
- Dual Band Wireless Router- This device supports both 5 GHz and 2.4 frequencies and at the same time all 11b and 11g users. This allows transmission of data on the 2.4 GHz band while the 5 GHz band can be utilized for video streaming.
- Wireless Gigabit Router- This works to maximize the speed of the internet access and a 4 port router for Ethernet access. It also enables the streaming of high definition videos.
- The 10 User Bundle- This Firewall devices are for high performance of the security system and is generally convenient for small business enterprise. This is a next generation security system and has all the features of security system.
- Firewall Gateway- The VPN Firewall Gateway is a security system ideal for mobile connections where the security system which is inserted between the network and mobile work station to filter the entry of data and videos.
- The UTM Appliance- This is a single device which has multiple security functions like the filtering content, balancing load, prevention of data leakage and anti spam gateway.
Firewall for Mobile Computing:
What is a Firewall for mobile computing? Protection from unwanted elements from any network or mechanism is also required while operating mobiles. With increasing usage of the ipods, iphones and other mobile computing devices, it has become absolutely necessary for installation of Firewall for mobile computing. The mobile system needs updated against threat from hackers and it is essential to install Firewall in mobiles. The security versions are available for download or if configured, you will get an alarm for installation of Firewall system to guard against malwares.
Downloading of Firewall:
You can download various versions of Firewall either free or on purchase. Many vendors are available for installation of Firewall in PCs and other devices for prevention of unwanted online activity.
Firewall Configuration:
What is a Firewall configuration? This is a generally asked question because the most important part to ensure safety of your PC is to install Firewall system. If you have an operation in your PC like the Windows or Linux, you are provided with a Firewall for protecting your PC. If Windows Firewall is enabled for Microsoft Internet Explorer and the Outlook Express to operate successfully and block any traffic which is unsolicited to gain control of your PC through any network.
Types of Firewall:
There are basically two types of Firewall, the Network Layer and the Application Layer. Network Layers are involved in making decisions regarding the port, destination and the source. Application Layer does not permit traffic moving directly between networks.
There can be endless discussions when we try to make out what is a Firewall.
