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gate questions

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gate questions

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  1. Which of the following statements are TRUE [GATE CSE 2012](S1) TCP handles both congestion and flow control(S2) UDP handles congestion but not flow control(S3) Fast retransmit deals with congestion but not flow control(S4) Slow start mechanism deals with both congestion and flow control S1, S2 and S3 only S1 and S3 only S3 and S4 only S1, S3 and S4 only Correct answer:2 Explanation 1: with the help of TCP window=>flow control and with the help of congestion window=> Congestion control2: No field are there in UDP header to control flow or congestion3: It is used by TCP to overcome the problem of out of order segments by re-transmission4: Slow start, nothing to do with flow control

  2. Correct answer:2Explanation1: with the help of TCP window=>flow control and with the help of congestion window=> Congestion control2: No field are there in UDP header to control flow or congestion3: It is used by TCP to overcome the problem of out of order segments by re-transmission4: Slow start, nothing to do with flow control

  3. A graphical HTML browser resident at a network client machine Q accesses a static HTML webpage from a HTTP server S. The static HTML page has exactly one static embedded image which is also at S. Assuming no caching, which one of the following is correct about the HTML webpage loading (including the embedded image)? [GATE CSE 2014] Q needs to send at least 2 HTTP requests to S, each necessarily in a separate TCP connection to server S Q needs to send at least 2 HTTP requests to S, but a single TCP connection to server S is sufficient A single HTTP request from Q to S is sufficient, and a single TCP connection between Q and S is necessary for this A single HTTP request from Q to S is sufficient, and this is possible without any TCP connection between Q and S

  4. Correct answer:2ExplanationWhenever a browser opens a webpage, it makes a separate request for each object of page like image, css, javascript, etc. However if multiple resources are served from same server, then one TCP connect is sufficient.

  5. Which of the following transport layer protocols is used to support electronic mail? [GATE CSE 2015] SMTP IP TCP UDP

  6. Correct answer:1ExplanationE-mail uses SMTP(Simple Mail Transfer Protocol) as an application layer protocol. SMTP uses TCP as a transport layer protocol.

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