Exercise C: Suppose a client computer (128.192.95.32) In Building B in Figure 5-

Question

Exercise C: Suppose a client computer (128.192.95.32) In Building B in Figure 5-15 requests a large Web page from the server in Building A (www1.anyorg.com). Assume that the client computer has just been turned on and does not know any addresses other than those in its configuration tables. Assume that all gateways and Web servers know all network layer and data link layer addresses.

a) Explain what messages would be sent and how they would flow through the network to deliver the Web page request to the server

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b) Explain what messages would be sent and how they would flow through the network as the Web server sent the requested page to the client

c) Describe, but do not explain in detail, what would happen if the Web page contained several graphic images

Explanation / Answer

A). First of the entire given client computer (128.192.65.32) is belong to the Class B network. We know that one of the commonly used services on internet is World Wide Web (www). HTTP (Hyper Text Transfer Protocol) is used by web browser and web server to communicate each other over the Internet. It is an application protocol and it is used to talk with other application. It sits on top of the TCP layer.

HTTP is connection less text based protocol. When a Client Web browser send a request to web server. This request is received by web server, new connection is being created and first it connected to the domain name server and fetches the corresponding IP address for the web server. If the page is existing then it back send to the web browser and connection is being closed. If the server cannot find the page then it return error message to the web server. And page will be completely loaded in the web browser window.

B). The given client IP address belong to Class C address, and subnet mask, so it can determine the part of network subnet. When the requested is generated through web URL the IP of DNS server translate application layer address into IP address. The IP address passes of an IP through gateway. (Request passes through router) outside of it subnet, the message is passes through router according to its routing table address outside. If the router uses the static routing and there is only one connection is formed, when router is used dynamic routing all messages must flow.

C) A client computer requested a web page from web server and a web page contain a high resolution image, It take the time to load the web page on client computer. It is totally depends on the network connectivity, also it lead the response time is too high. We know that data is transferred from one machine to another machine by frame over the network. When the frame size is large and the client computer is unable to getting the frame. This may be chance of packet losing and resultant image is not loaded on client computer.

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