Computer Science and Information Technology
GATE CSE topic:computer-networks PYQs
Build your understanding with focused practice from past exam papers.
Questions 31–40 of 72. Imported answers require independent review unless marked reviewed.
Question 58
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Consider the entries shown below in the forwarding table of an IP router. Each entry consists of an IP prefix and the corresponding next hop router for packets whose destination IP address matches the prefix. The notation “/N” in a prefix indicates a subnet mask with the most significant N bits set to 1.
Prefix | Next hop router |
|---|---|
10.1.1.0/24 | R1 |
10.1.1.128/25 | R2 |
10.1.1.64/26 | R3 |
10.1.1.192/26 | R4 |
This router forwards 20 packets each to 5 hosts. The IP addresses of the hosts are 10.1.1.6, 10.1.1.72, 10.1.1.132, 10.1.1.191, and 10.1.1.205. The number of packets forwarded via the next hop router R2 is ________
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Consider sending an IP datagram of size 1420 bytes (including 20 bytes of IP header) from a sender to a receiver over a path of two links with a router between them. The first link (sender to router) has an MTU (Maximum Transmission Unit) size of 542 bytes, while the second link (router to receiver) has an MTU size of 360 bytes. The number of fragments that would be delivered at the receiver is ________.
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Suppose two hosts are connected by a point-to-point link and they are configured to use Stop-and-Wait protocol for reliable data transfer. Identify in which one of the following scenarios, the utilization of the link is the lowest.
Your answerChoose one option.
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Which of the following statements is/are INCORRECT about the OSPF (Open Shortest Path First) routing protocol used in the Internet?
Your answerSelect all correct options. You can choose more than one.
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Suppose you are asked to design a new reliable byte-stream transport protocol like TCP. This protocol, named myTCP, runs over a 100 Mbps network with Round Trip Time of 150 milliseconds and the maximum segment life of 2 minutes. Which of the following is/are valid lengths of the Sequence Number field in the myTCP header?
Your answerSelect all correct options. You can choose more than one.
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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?Your answerSelect all correct options. You can choose more than one.
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The forwarding table of a router is shown below.
Subnet Number | Subnet Mask | Interface ID |
|---|---|---|
200.150.0.0 | 255.255.0.0 | 1 |
200.150.64.0 | 255.255.224.0 | 2 |
200.150.68.0 | 255.255.255.0 | 3 |
200.150.68.64 | 255.255.255.224 | 4 |
Default | | 0 |
A packet addressed to a destination address 200.150.68.118 arrives at the router. It will be forwarded to the interface with ID _____.
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Consider an enterprise network with two Ethernet segments, a web server and a firewall, connected via three routers as shown below.
What is the number of subnets inside the enterprise network?
Your answerChoose one option.
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Consider the resolution of the domain name
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____________.Log in to check the answer
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Consider routing table of an organization’s router shown below:
Subnet Number | Subnet Mask | Next Hop |
|---|---|---|
12.20.164.0 | 255.255.252.0 | R1 |
12.20.170.0 | 255.255.254.0 | R2 |
12.20.168.0 | 255.255.254.0 | Interface 0 |
12.20.166.0 | 255.255.254.0 | Interface 1 |
default | | R3 |
Which of the following prefixes in CIDR notation can be collectively used to correctly aggregate all of the subnets in the route table?
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