Layering & Internet Model

3141 words 13 pages
There are three parts to this assignment relating to each lecture in Module 1.

Part 1: Layering and the Internet Model
Imagine that a technology organization has been in business for decades, and that the organization developed its own method of computer-to-computer communication. Because this method of communication only occurs within this organization, it is not layered, but rather is designed to operate as quickly and efficiently as possible on the custom hardware by using the least amount of overhead possible. The organization continues to create its own communication hardware and software that works with modern computers, but the CTO of the organization is considering replacing this custom communication solution with the adoption
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The examples of physical layer are cables(optical fiber cable, UTP cable, coaxial cables, telephone cables). Also in case of wireless network medium of transmission is air. For the above technology organization, the physical layer will be the RJ-45 UTP cable for LAN and fiber optic cable for Backbone network.

Data link layer : The Data link layer manages the physical transmission circuit in layer 1 and transforms it into a circuit that is free of transmission errors as far as layers above are concerned. Another task of layer 2 is to solve the problems caused by damaged ,lost ,or duplicate messages so the succeeding layers are shielded from transmission errors. The data link layer is also responsible for logical link control, media access control, hardware addressing, error detection, error correction and handling and defining physical layer standards. It provides reliable data transfer by transmitting packets with the necessary synchronization, error control and flow control.

The data link layer is where most LAN (local area network) and wireless LAN technologies are defined. Among the most popular technologies and protocols generally associated with this layer are Ethernet, Token Ring, FDDI (fiber distributed data interface), ATM (asynchronous transfer mode), SLIP (serial line Internet protocol), PPP (point-to-point protocol), HDLC (high


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