answer two questions please 2.1 Read the following descriptions and fill in the

Question

answer two questions please

2.1 Read the following descriptions and fill in the appropriate OSI network OSI Model Layer Description In this layer, Program access network services using lication Programming Interface (API) This layer enables computers to establish, use and close connections. This layer breaks data into individual chunks, depend on the protocol used, sometimes this chunks called segments, and other times they called datagram. Segments are assigned sequence no Communications and Networking, Training Book By: Dr. Khaled El Menshawy ©2015 All rights reserved for the author 47 OSI Model Layer Description This layer determine data format used for computer to exchange data This layer is divided into two sublayers, Logical control layer and Media access control I This layer converts a digital signal into a form compatible with network media and send it out This layer adds routable address and encapsulates ents and datagrams in packets. .2.2 Read the following descriptions and fill in the appropriate TCP/IP Model: TCP/IP Layers Description This layer correlate to application, presentation, and session layers of the OSI seven-laver model This layer contains most of the physical devices associated with networking, cables, NICs, and switches. This layer provides either an unreliable datagram service or a reliable end-to-end connection-oriented communication This layer ensures that IP packets have a valid IP address and are routed to the proper destination

Explanation / Answer

2.1 1. Application layer - This is the layer thorough which user or application processes
       access the network services.

    2. Session layer establishes,maintains and terminates connections between two applicaton processes

    3. Transport layer - This layer provides flow control, sequencing and message segmentation

   4. Presenation layer - This layer formats the data to be presented to the application layer

   5. Data Link Layer - encoding and decoding physical layer into bits, error detection and frame synchronizatuon.

   6. Physical layer - This layer sends raw data (electrical signals, light pulse, radio waves) through the network.It provides devices including cables, cards, interfaces etc.

   7. Network Layer - Routing, packet formation, Frame Fragmentation etc

2.2 1. Application layer - In TCP/IP, Application,Presenattion, session of OSI model are combined together

    2.Physical layer - This layer sends raw data (electrical signals, light pulse, radio waves) through the network.It provides devices including cables, cards, interfaces etc.

    3. Transport layer - This layer provides flow control, sequencing and message segmentation etc

    4. Network Layer - Routing, packet formation, Frame Fragmentation etc

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