Question

Describe the difference between IP and Network Access layer in TCP protocol and also explain the control information embedded in these two layers

Answer 1

Network Access Layer:

Network access layer is the first layer of TCP/IP protocol. It basically defines how data is sent physically through the network. There are some protocols which are included in this layer like Ethernet,Token ring etc. This layer corresponds the data-link layer and physical layer of OSI model. So the internet layer has a view of whole inter-network whereas Network Access layer is limited to the physical layer boundary. Where two functions are possible here the first function is Encapsulating of the IT data-gram in the frames which is sent through the network. The second one is of mapping the physical address to the hardware address so that the data is sent into the frames and also it encapsulates the IT data-gram. Network Access layer uses physical address to identify the host and to deliver data. Here the physical address is mapped with the hardware address so that the data deliver from one source to one destination will be possible. The network access layer protocol data unit(PDU) is called a frame. It contains IP packet as well as protocol header.

IP:

Inter Layer is responsible for logical host of network access layer. It takes care of the addressing of hosts by giving them IP (Internet Protocol) address and handles the routing of packets among multiple networks. It's main function is to aggregate the data-packets into IP data-grams and transfer it all through the network so it forwards the PI data-gram or route the IP-data-gram from source to destination. And also it allows the destination host to to send the data or insert data so the other side destination will receive these data through the network. And moreover it is a packet switching network and these packets are called as IP data-gram.