Identify the correct order in which the following actions take place in an…

2014

Identify the correct order in which the following actions take place in an interaction between a web browser and a web server.

1. The web browser requests a webpage using HTTP.

2. The web browser establishes a TCP connection with the web server.

3. The web server sends the requested webpage using HTTP.

4. The web browser resolves the domain name using DNS.

Answer: A. 4,2,1,3 — Key idea: the browser must know the server IP and have a transport connection before sending an HTTP request. Correct order: 4 → 2 → 1 → 3 Resolve the domain…

  1. A.

    4,2,1,3

  2. B.

    1,2,3,4

  3. C.

    4,1,2,3

  4. D.

    2,4,1,3

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Show answer & explanation

Correct answer: A

Key idea: the browser must know the server IP and have a transport connection before sending an HTTP request.

Correct order: 4 → 2 → 1 → 3

  • Resolve the domain name using DNS (4): the browser finds the server's IP address for the requested domain.

  • Establish a TCP connection with the web server (2): the client and server perform the TCP three-way handshake so data can be exchanged reliably.

  • The web browser requests a webpage using HTTP (1): the HTTP request is sent over the established TCP connection.

  • The web server sends the requested webpage using HTTP (3): the server responds with the requested resource over the same connection.

Notes: DNS lookups are often cached so a lookup may be skipped in practice. For HTTPS, a TLS handshake occurs after TCP is established and before the HTTP request is sent.

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