To answer this question, you need to understand the layers of the OSI (Open Systems Interconnection) model.
The OSI model is a conceptual framework that standardizes the functions of a communication system into seven different layers. These layers are:
- Physical layer
- Data link layer
- Network layer
- Transport layer
- Session layer
- Presentation layer
- Application layer
Each layer has its own specific functions and responsibilities.
In the context of the question, packets are found at the network layer (layer 3) of the OSI model. The network layer is responsible for routing and forwarding data packets between different networks. It encapsulates data received from the transport layer into packets and adds information such as source and destination IP addresses. These packets are then transmitted across the network.
Let's go through each option to understand why it is correct or incorrect:
Option A) Data link - This option is incorrect because the data link layer (layer 2) is responsible for transferring data between directly connected nodes over a physical link. It frames data received from the network layer into frames and adds information such as source and destination MAC addresses.
Option B) Transport - This option is incorrect because the transport layer (layer 4) is responsible for reliable and efficient end-to-end delivery of data. It segments data received from the session layer into smaller units called segments and adds information such as source and destination port numbers.
Option C) Network - This option is correct because the network layer (layer 3) is responsible for routing and forwarding data packets between different networks. It encapsulates data received from the transport layer into packets and adds information such as source and destination IP addresses.
Option D) Physical - This option is incorrect because the physical layer (layer 1) is responsible for transmitting raw bit streams over a physical medium.
The correct answer is Option C) Network. This option is correct because packets are found at the network layer, which is responsible for routing and forwarding data packets between different networks.