GATE CS 2016 Set 2 — Question 35
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Computer Networks → Application Layer → DNS
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Question
Identify the correct sequence in which the following packets are transmitted on the network by a host when a browser requests a webpage from a remote server, assuming that the host has just been restarted.
Correct answer
(C) DNS query, TCP SYN, HTTP GET request
Solution
When a host has just been restarted, its DNS cache is empty. Therefore, the sequence of events is:
1.DNS query: The browser needs to resolve the domain name of the remote server to an IP address.
2.TCP SYN: Once the IP address is obtained, the host initiates a TCP connection with the server using the 3-way handshake (SYN, SYN-ACK, ACK).
3.HTTP GET request: After the TCP connection is established, the browser sends the HTTP GET request to fetch the webpage.
Thus, the correct sequence is DNS query TCP SYN HTTP GET request.Continue learning with Success Tracker
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