Layer 3 - Network Layer: attaches the source and destination IP address to the data, IPv4 and IPv6 are used for logical addressing, process through which the data packets can travel from one node to another in a computer network, routing decisions are mainly based on IP addresses or logical addressing, finds the most optimum path for data transmission, Layer 4 - Transport Layer: Divides the data received into multiple data segments, controls the flow of the data being transmitted, checks for any kind of errors in the data using the checksum bits, can also request for retransmission of some data if it is not received at the receiver's end, maintains the connection between the devices in a proper way,

OSI Model - Example sort (Layers 3&4)

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