An IP packet consists of 20 bytes of header and 1500 bytes...

Name: Problem 39, Chapter 7: Communication Networks: Fundamental Concepts and Key Architectures
Uploaded: 2023-10-26T06:38:07-08:00
Duration: 4 min 29 s
Channel: Aparna Shakti
Description: An IP packet consists of 20 bytes of header and 1500 bytes of payload. Now suppose that the packet is mapped into ATM cells that have 5 bytes of header and 48 bytes of payload. How much of the resulting cell stream is header overhead?

An IP packet consists of 20 bytes of header and 1500 bytes of payload. Now suppose that the packet is mapped into ATM cells that have 5 bytes of header and 48 bytes of payload. How much of the resulting cell stream is header overhead?

Key Concepts

Header Overhead

Header overhead refers to the extra data added by protocol headers at different layers of the network, which is necessary for control, management, and routing of the data. In scenarios where a larger packet is segmented into multiple smaller cells, the cumulative header overhead can become significant compared to the actual payload data, affecting overall transmission efficiency.

Packet Segmentation

Packet segmentation is the process of dividing a larger data packet into smaller units or cells for transmission over a network that supports only limited payload sizes. This process is critical in adapting variable-sized packets to fixed-sized cell structures, as seen in networks like ATM.

IP Packet Structure

An IP packet is composed of a header and a payload. The header contains control information such as addressing, packet sequencing, and protocol details, while the payload is the actual data being transmitted. This separation is fundamental for routing, reassembly, and ensuring proper delivery in network communications.

ATM Cell Architecture

Asynchronous Transfer Mode (ATM) is a networking technology that uses fixed-size cells for data transmission. Each ATM cell consists of a header and a payload. The fixed cell size allows for easier switching and multiplexing at high speeds, but it can introduce inefficiencies when data packets are segmented into many cells due to the overhead incurred by each cell’s header.

Transcript

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