Application Layer Protocols
Q1.
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?Q2.
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 .Q4.
Which protocol suite designed by IETF to provide security for a packet at the Internet layer?Q5.
Which of the following protocol is used for transferring electronic mail messages from one machine to another?Q6.
When a DNS server accepts and uses incorrect information from a host that has no authority giving that information, then it is calledQ7.
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.Q8.
Which of the following is/are example(s) of stateful application layer protocols? (i) HTTP (ii) FTP (iii) TCP (iv) POP3