Application Layer Protocols


Question 1
Suppose in a web browser, you click on the www.gate-2023.in URL. The browser cache is empty. The IP address for this URL is not cached in your local host, so a DNS lookup is triggered (by the local DNS server deployed on your local host) over the 3-tier DNS hierarchy in an iterative mode. No resource records are cached anywhere across all DNS servers.
Let RTT denote the round trip time between your local host and DNS servers in the DNS hierarchy. The round trip time between the local host and the web server hosting www.gate-2023.in is also equal to RTT. The HTML file associated with the URL is small enough to have negligible transmission time and negligible rendering time by your web browser, which references 10 equally small objects on the same web server.
Which of the following statements is/are CORRECT about the minimum elapsed time between clicking on the URL and your browser fully rendering it?
A
7 RTTs, in case of non-persistent HTTP with 5 parallel TCP connections.
B
5 RTTs, in case of persistent HTTP with pipelining.
C
9 RTTs, in case of non-persistent HTTP with 5 parallel TCP connections.
D
6 RTTs, in case of persistent HTTP with pipelining.
GATE CSE 2023   Computer Network
Question 2
Consider the resolution of the domain name www.gate.org.in by a DNS resolver. Assume that no resource records are cached anywhere across the DNS servers and that iterative query mechanism is used in the resolution. The number of DNS query-response pairs involved in completely resolving the domain name is .
A
2
B
3
C
4
D
5
GATE CSE 2022   Computer Network


Question 3
Assume that you have made a request for a web page through your web browser to a web server. Initially the browser cache is empty. Further, the browser is configured to send HTTP requests in non-persistent mode. The web page contains text and five very small images.The minimum number of TCP connections required to display the web page completely in your browser is__________.
A
1
B
6
C
5
D
2
GATE CSE 2020   Computer Network
Question 4
Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)?
A
IMAP POP3
B
SMTP, POP3
C
SMTP, MIME
D
IMAP, SMTP
GATE CSE 2019   Computer Network
Question 5
What is WPA?
A
wired protected access
B
wi-fi protected access
C
wired process access
D
wi-fi process access
ISRO CSE 2017   Computer Network


There are 5 questions to complete.

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