COMPUTER THREATS SECURITY
WHAT IS A FIREWALL IN NETWORK SECURITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A proxy server operates at the Application layer, while a packet filtering firewall operates at the Network layer.
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A proxy server includes filters for the session ID as well as the IP address and port number.
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A proxy server can prevent unknown network attacks, while a packet filtering firewall can only prevent known attacks.
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A proxy server is used to create a DMZ, while a packet filtering firewall can only be used for screened subnets.
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Detailed explanation-1: -How does a proxy server differ from a packet filtering firewall? A proxy server operates at the Application layer, while a packet filtering firewall operates at the Network layer. A proxy server can prevent unknown network attacks, while a packet filtering firewall can only prevent known attacks.
Detailed explanation-2: -The technology is similar to traditional packet filtering firewalls, but proxy firewalls add an extra level of protection. A proxy firewall has its own Internet Protocol (IP) address, so an outside network connection will never receive packets directly from the sending network.
Detailed explanation-3: -A firewall and a proxy server are both parts of a network’s security. Firewalls can prevent unauthorized access to your computer by blocking ports and programs, whereas proxy servers effectively hide your internal network from the Internet.
Detailed explanation-4: -Packet filter firewalls are less secure than application level firewalls because the packet filtering firewalls do not understand application layer protocols. Packet filtering firewalls cannot restrict access to protocol subsets for even the most basic services such as the PUT and GET commands in FTP.
Detailed explanation-5: -An application layer firewall is frequently installed on a dedicated server separate from the filtering router, but commonly used with a filtering router. It is also refereed to as a proxy server because this firewall can be configured to run special software that acts as a proxy for a service request.