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Computer Networks
OSI/TCP-IP Layers & Routing
GATE 2016
Medium

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.

  • AHTTP GET request, DNS query, TCP SYN
  • BDNS query, HTTP GET request, TCP SYN
  • DNS query, TCP SYN, HTTP GET request
  • DTCP SYN, DNS query, HTTP GET request

Explanation

The browser must first resolve the hostname to an IP address (DNS query), then establish a TCP connection to that IP (TCP SYN), and only then can it send the actual HTTP GET request over that connection.

Source: GATE CS 2016 (Session 2 / Set B) (2016)

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