COMPUTER THREATS SECURITY
WHAT IS A FIREWALL IN NETWORK SECURITY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Layer 2
|
|
|
Layer 3
|
|
|
Layer 4
|
|
|
Layer 7
|
Detailed explanation-1: -In the basic form, packet filters operate at Layer 3 (Network) of the Open Systems Interconnect (OSI) model. This provides network access control based upon information contained in the packet.
Detailed explanation-2: -Stateless Firewall (Static Packet Filtering) A stateless firewall is the most basic kind-it’s basically a packet filter that operates on OSI layers 3 and 4. This is the most basic type of network perimeter firewall.
Detailed explanation-3: -A firewall generally works at layer 3 and 4 of the OSI model. Layer 3 is the Network Layer where IP works and Layer 4 is the Transport Layer, where TCP and UDP function. Many firewalls today have advanced up the OSI layers and can even understand Layer 7 – the Application Layer.
Detailed explanation-4: -Firewalls. Packet filtering A network layer firewall or packet-filtering firewall works at the network layer of the Open Systems Interconnection (OSI) model and can be configured to deny or allow access to specific ports or Internet Protocol (IP) addresses.