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A firewall is usually placed in front of a group of machines and its primary function is to control communication from and to this group of machines. Communication between two machines over the internet is a stream of packets (datagrams) send in both directions. The firewall examines all packets that is about to be routed through the machine and, based on a set of rules, determines if the packet is allowed to pass through the machine or not. This functionality is often referred as a packet filter.
The secondary function of a firewall is to modify the packets passing through the firewall. This is called Network address translation (NAT), as the modifications usually applies to either sender or receiver information contained in the packets. NAT can for example be used to allow machines without a public addressable Internet protocol (IP) number, to access the Internet through a firewall, by using the IP-number of the firewall as the sender identification. This is also called ip masquerading, as it disguises the address of the machines behind the firewall.
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Firewall is basically used to prevent the network from unauthorized access. These are basically of 2 types: 1) Hardware Firewall:-Its works on network layer and used for packet filtering usually used for network security. Its only allow/deny packets(ports). eg- Cisco pix, checkpoint , juniper etc. are vendors of H/W firewall. 2) Software Firewall:- Its work at application level.It is signature based firewall it does not blocks malicious packets. Its only blocks predefined malicious signature. eg- Antivirus like Mcafee, Symantech, Quick Heal
Purpose of firewall is as follows: Firewalls are used to mediate and control all information that is communicated between an external (untrusted) network and an internal (trusted) network. They make use of IP filtering and application proxies to implement firewall security policies.
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What other test could you perform to prove that it was your computers firewall that was blocking the connection and not the firewall on the computer you are using as a client?
The test that can prove which computer's firewall is blocking a program from running is to turn off the firewall on the computer being used, then try to run the program in question. If the program still doesn't work, then the main computer is blocking the program.
What term is used to describe a dedicated hardware device that provides firewall services?
appliance based
A hardware device with software that is used to detect unauthorized activity on your network?
A Firewall can fit that description.
Which mechanisms is most often used in firewall rules to allow traffic on to the network?
Port Numbers
How can one protect hardware devices with a firewall?
One can protect their computer hardware devices by installing a firewall in order to prevent any malicious activity to be sent to ones computer. Without a firewall one runs the risk of receiving a virus through email or even by visiting certain websites.
What firewall generation is still in common use?
As of 2014, the third generation firewall is the most commonly one used. A firewall is used as an added protection for your computer.
Can A Broadband router sometimes be used as a firewall?
Can A Broadband router sometimes be used as a firewall?
What devices can be used to prevent data from being transmitted into or out of a network?
A router A firewall
What a firewall used for?
to protect a computer or network from unauthorized access
What is an Endian firewall used for?
An Endian firewall can be used for monitoring site traffic, configuring a DHCP server, and prioritizing IP traffic. It can also provide detailed system status information.
Does one require a special firewall setting when using social networking sites?
A firewall is used to filter out information that is aggressive or what is perceived to be unsuitable. A firewall also acts as a barrier to the ingress of viruses and Trojans.
What is the acronym for the protocol that is used when securely communicating with a web server?
firewall
Should the The KRESV test should be used to program your firewall?
False
What is a Firewall and why is it used?
To prevent a fire coming from your neighbors adjoining home,
Should the KRESV test should be used to program your firewall?
False
What does your Windows firewall do?
Sadly, the Windows firewall does very little, if anything, to help protect your computer. Of the 25 recognized firewall tests - Windows firewall passed none. Think of a firewall as having a security guard on every door and window of your home. That security guard only lets the people you allow to enter or leave. It is a good idea to have a firewall, just it is not a good idea to depend on the windows firewall, there are much better free ones available on the Internet.
Which intermediary devices could be used to implement security between networks?
Security between networks is implemented in an intermediary device (a router or firewall appliance) at the perimeter of the network. The firewall function performed by this device permits only known, trusted data to access the network.
