A packet filtering firewall operates at which of the following OSI layers? (Select all that apply) Options: A . &nbspAt the application layer B . &nbspAt the transport layer C . &nbspAt the network D . &nbsp `2’ and `3’ E . &nbspNone of these

A packet filtering firewall operates at which of the following OSI layers? (Sele

Question

A packet filtering firewall operates at which of the following OSI layers? (Select all that apply)

Answer: Option D
Packet filtering is a type of firewall technology used to control the incoming and outgoing traffic of a computer or network. It uses a set of rules to evaluate the header of a packet and decide whether it should be allowed to pass through the firewall or not. Packet filtering firewalls operate at the Network Layer (Layer 3) and the Data Link Layer (Layer 2) of the OSI model.

The OSI model (Open System Interconnection Model) is a seven-layer model that defines how data is transmitted between two computers over a network. It defines the protocols and standards that must be adhered to for successful communication. The seven layers are as follows:

1. Physical Layer: This layer deals with physical aspects of communication such as media, cabling, and signal encoding.

2. Data Link Layer: This layer deals with physical addressing, error control, and data flow control.

3. Network Layer: This layer deals with logical addressing, routing, and the delivery of packets.

4. Transport Layer: This layer deals with the reliable delivery of data between two hosts.

5. Session Layer: This layer establishes, maintains, and terminates connections between two hosts.

6. Presentation Layer: This layer deals with data representation and data conversion.

7. Application Layer: This layer deals with application-specific data and provides an interface for users to access the network.

Packet filtering firewalls are used to control the flow of traffic across a network. They are configured with a set of rules that evaluate the header of each packet and decide whether it should be allowed to pass through the firewall or not. Packet filtering firewalls operate at the Network Layer (Layer 3) and the Data Link Layer (Layer 2) of the OSI model.

Packet filtering firewalls are typically used to control access to a network. They can be used to block unwanted traffic, such as malicious or unwanted applications, or to allow only specific types of traffic to pass through the firewall. Packet filtering firewalls are a cost-effective way to secure a network, as they are relatively easy to configure and maintain.

In conclusion, packet filtering firewalls operate at the Network Layer (Layer 3) and the Data Link Layer (Layer 2) of the OSI model. They are used to control the flow of traffic across a network and can be used to block unwanted traffic or to allow only specific types of traffic to pass through the firewall.

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