Which layer is responsible for the delivery of individual packets from source host to the destination host?

1. Physical layer 
2. Session layer 
3. Presentation layer 
4. Network layer 

Answer (Detailed Solution Below)

Option 4 : Network layer 

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DMRC AM S&T Official Paper 2020

120 Questions 120 Marks 90 Mins

The network layer layer comes in between the transport layer and the data link layer in the OSI model. The different layers associated with OSI are as shown:

Network Layer:

• The network layer is responsible for ensuring data transfer between two different networks.
• If the two devices communicating are on the same network, then the network layer is unnecessary.
• The network layer breaks up segments from the transport layer into smaller units, called packets, on the sender’s device, and reassembling these packets on the receiving device.
• The network layer also finds the best physical path for the data to reach its destination; this is known as routing.

Physical Layer: Responsible for the physical connection between devices.

Data-link layer: Responsible for reliable transfer of data frames from one node to another, connected by a physical layer.

Network layer: It manages the delivery of individual data packets from source to destination through Routing.

Transport layer: Responsible for the delivery of the center message from source host to a destination host. Here, Data is referred to as segments.

Session layer: It establishes sessions between users and offers services like dialog control and synchronization

Presentation layer: Monitors syntax and semantics of transmitted information through translation, compression, and encryption.

Application layer: Provides high-level application program Interface to user

Which layer is responsible for packet delivery?

Which layer is responsible for source to destination delivery of data?