Data Communication Project 1 Key

Data Communication Project 1 Key - Steps in the client...

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Steps in the client getting web pages from www1.anyorg.com (Per conditions & assumptions given in Project 1) Step A 1- HTTP Request The client (IP 128.192.98.130) browser requests web pages from www1.anyorg.com. The HTTP request from the application layer goes to the network layer through the transport layer. The network layer should send the HTTP request to the web server but it does not know the IP address of the web server. Therefore, the client spawns a DNS request Go to Step B.1. 2- HTTP Request From Step B.6 The network layer inserts the IP address of the web server as the to-IP address and the client’s IP address as the from-IP address and passes the packet to the DLL. The client matches the IP address of the web server with its subnet mask and discovers it is on the same subnet. Since the client does not know the MAC address of the web server, it cannot process the packet at the data link layer. To get the MAC address of the web server, it issues an ARP request Go to Step C.1. 3- HTTP Request From Step C.2 The client prepares the DLL packet with its own MAC address as the from-MAC address and the web server’s MAC address as the to-MAC address. The packet is then sent through the physical layer. 4- HTTP Request The to-MAC address in the HTTP request received by the web server is matched with its own MAC address. Since there is a match it is passed to the network layer after checking for errors. Since the to-IP address also matches the web server’s IP address, the HTTP request is passed on to the application layer (web server) through the transport layer. 5- HTTP Response The web server recognizes the HTTP request and sends the web pages to the client from its application layer. The web pages are passed to the transport layer. Since web pages can be large, they may need several packets. The transport layer breaks the web pages into many packets and each packet has the following sequence.
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