Question

Using your web browser, you just sent a request for a web page. Describe, on the destination web server computer, how your request is processed for it to be accepted and delivered to the correct application. Hint: this is a question about decapsulation (the opposite of encapsulation), and your discussion should start at the data link layer of the web server host.

Answer 1

• When you type a URL in the web browser. Web browser queries DNS for ip address. Generally web browsers store cache of previously visited sites. First it checks the ip address in that cache if not there then it requests the DNS Server.
• Then browser sent a single packet with the header contains destination ip address. Then from here DNS server will choose the path from the routing table which is fastest to the destination DNS server through different DNS servers in between.
• After it reaches the destination DNS Server it again sends back through the same path to the source DNS Server. Then now the web browser will get the destination server ip address. Then the web browser assembles the HTTP request which is consisting the header and merge optional content. This header consists the path for destination DNS Server.
• This HTTP request is then sent to the destination DNS server and when it reaches there the web browser at that side will receive the request and generates the response for this.
• Finally that response is sent back to the source system in the same path which was having in the header.