The essential qualities of any system are correctness, reliability, robustness a

Question

The essential qualities of any system are correctness, reliability, robustness and security, compatibility and scalability, ease of use, and efficiency. Consider for each of these how the physical, data-link, and Internet layers contribute to these qualities and how the higher layers add these qualities to the lower layers. You should submit around 3/4 to one page for each layer, but as always your answers should be well structured and to the point. I want each layer of one page (word document page) and brief description example: physical layer: correctness, reliability, robustness, security, compatibility and scalability, ease of use and efficiency. mention all the points to each layer with valid answers to each question with appropriate reasons. i found other answers to this question useless. answer only if you excellent knowledge

Explanation / Answer

Answer:

PHYSICAL LAYER:
It deals with electrical, mechanical, functional and procedural characteristics of physical links. Thus correctness provided by the physical link with the way of transmission.
Like: simplex, half duplex and full duplex.
It provides reliability as well As uses different encoding like: Manchester Encoding and Differential Manchester Encoding, thus provides the reliability. It provides robustness as physical links are encoded with many techniques.
Physical Layer Deals with the topologies, hence errors are copped and uses different wires to cope such errors.
It is efficient and compatible as well because the physical layers provide the functional and procedural characteristics of the physical Links.
DATA LINK LAYER:
Data link layer provides flow control, error control, framing, physical addressing and access control.
Thus all the qualities listed in the question is provided by the data link layer.
Let me give you a bit concept about framing: Framing: Takes data from above layer and put it in frames and send it.
Thus provides security and is efficient as well. Physical Layer provides the unique number called MAC address to it and thus secure the data.
INTERNET LAYER:
Here host to host connection is provided, Logical Addressing is used, switching, routing, congestion control, and fragmentation.
With all these facilities provided by the internet layer, the qualities mentioned in the question is covered.
Congestion control provide the robustness , logical addressing provide the security.
Routing and switching provide the correctness in the system.
Fragmentation somehow provides the efficiency and scalability of the system.

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