FUNDAMENTALS OF COMPUTER

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COMPUTER THREATS SECURITY

WHAT IS A FIREWALL IN NETWORK SECURITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Almost all main border firewalls use ____ filtering as their primary filtering mechanism.
A
unified threat management
B
application proxy
C
static packet filtering
D
None of the above
Explanation: 

Detailed explanation-1: -Almost all main border firewalls use Stateful Packet Inspection (SPI) as their primary inspection mechanism. However, they use other methods as secondary filtering mechanisms.

Detailed explanation-2: -Packet-filtering firewalls operate at the network layer (Layer 3) of the OSI model. Packet-filtering firewalls make processing decisions based on network addresses, ports, or protocols. Packet-filtering firewalls are very fast because there is not much logic going behind the decisions they make.

Detailed explanation-3: -A single UTM firewall can help perform all of these functions, all from a single appliance. They use methods such as deep packet inspection, web filtering, antivirus, and content filtering, along with several security functions, to protect your networks.

Detailed explanation-4: -Explanation: Stateful Multilayer Inspection firewalls are a combination of other three types of firewalls. These combinations are Packet filtering, circuit level and application-level gateway firewalls.

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