What are two reason using layer protocols?

Answer 1

• A layered protocol architecture provides a conceptual framework for dividing the complex task of exchanging information between remote hosts into simpler tasks.
• Each protocol layer has a narrowly defined responsibility.
• A protocol layer provides a standard interface to the next higher protocol layer.
• Consequently, it hides the details of the underlying physical network infrastructure.
• Benefit: The same user-level (application) program can be used over very diverse communication networks.
• Example: The same WWW browser can be used when you are connected to the internet via a LAN or a dial-up line.

Answer 2

Division of a communication protocol into layers enables each layer designed for that specific purpose to focus on its task efficiently, thus enabling all layers to do their work very efficiently. A protocol consists of multiple tasks like transmitting physical bits, packaging them into packets, finding a suitable network path for the bits to travel, etc. so an unlayered protocol would not be able to handle all these tasks at once, let alone efficiency.

Furthermore, even if we manage to design an unlayered protocol, it cannot perform individual tasks efficiently, the one stage has to perform all tasks by itself and produces very low quality output. Designing an unlayered protocol itself is a cumbersome process.

Answer 3

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