Dissertation Introduction: Open Systems Inter-connectivity

Purpose of the Open Systems Interconnectivity (OSI) model

The OSI model corresponds to the conceptual model that characterizes and standardizes the communication function or the telecommunication. The OSI model aims to direct the developers and vendors so that the communication products and the software programs which they develop interoperate with each other. In other words, the chief purpose of the OSI model is to achieve interoperability among various communication systems via standard protocols. It also provides a logical comparison between different tools utilized for communication. The original version of OSI model comprises seven layers.

  1. Layer 1- The physical layer: This layer transmits the bit stream by the means of network at radio, optical and electrical level,
  2. Layer 2-The data-link layer: The purpose of this layer is to establish the physical network and placing the packets into frames,
  3. Layer 3-The network layer: The function of this layer is to handle the addressing and routing of data,
  4. Layer 4-The transport layer-The purpose of this layer is to manage the packetization of the data and its delivery,
  5. Layer 5-The session layer: This layers aims to establish, collaborate and terminate the conversation,
  6. Layer 6-The presentation layer: This layer forms the part of the operating system and is responsible for converting the inward and outward data from one presentation format into another
  7. Layer 7- The application layer: At this layer the network capacity is assessed and communication patterns are identified.

Compare and contrast TCP and UDP

TCP and UDP are the two layer protocols that are widely utilized on the internet for transmitting information from one host to another. However, both the networks operate in a different protocol. The most significant difference between the two protocols is that the TCP is a connection-oriented protocol whereas the UDP is a connectionless protocol. The difference between both the protocols exists in terms of reliability. In the case of TCP, the delivery of the message is guaranteed to the client while UDP is not much reliable as TCP, as no delivery guarantee is presented to the client if their message is delivered through UDP. No data boundary is preserved in TCP while it is preserved in UDP. Another difference between the two layer protocols can be explained in terms of their weights. TCP is considered as heavy weighted for the reason that an overhead is mentioned above. On the other hand, UDP is light weighted.

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