Recent questions and answers in Computer Networks / GATE Overflow for GATE CSE

8 votes

4 answers

1

GATE CSE 2022 | Question: 50
Consider the data transfer using $\text{TCP}$ over a $1 \; \text{Gbps}$ link. Assuming that the maximum segment lifetime $\text{(MSL)}$ is set to $60 \; \text{seconds},$ the minimum number of bits required for the sequence number field of the $\text{TCP}$ header, to prevent the sequence number space from wrapping around during the $\text{MSL}$ is ________________.

Consider the data transfer using $\text{TCP}$ over a $1 \; \text{Gbps}$ link. Assuming that the maximum segment lifetime $\text{(MSL)}$ is set to $60 \; \text{seconds},$ ...

꧁༒☬ĿọŗԀ 🆂🅷🅸🆅🅰☬༒꧂

7.8k views

꧁༒☬ĿọŗԀ 🆂🅷🅸🆅🅰☬༒꧂ answered Apr 25

2 votes

3 answers

2

GATE CSE 2024 | Set 2 | Question: 45
Consider an Ethernet segment with a transmission speed of $10^{8} \mathrm{bits} / \mathrm{sec}$ and a maximum segment length of $500$ meters. If the speed of propagation of the signal in the medium is $2 \times 10^{8} \mathrm{~meters} / \mathrm{sec}$, then the minimum frame size (in bits) required for collision detection is ___________.

Consider an Ethernet segment with a transmission speed of $10^{8} \mathrm{bits} / \mathrm{sec}$ and a maximum segment length of $500$ meters. If the speed of propagation ...

SarthakShastri

1.8k views

SarthakShastri answered Apr 22

1 votes

3 answers

3

GATE CSE 2024 | Set 2 | Question: 28
Which one of the following $\text{CIDR}$ prefixes exactly represents the range of $\text{IP}$ addresses $10.12 .2 .0$ to $10.12 .3 .255$? $10.12 .2 .0 / 23$ $10.12 .2 .0 / 24$ $10.12 .0 .0 / 22$ $10.12 .2 .0 / 22$

Which one of the following $\text{CIDR}$ prefixes exactly represents the range of $\text{IP}$ addresses $10.12 .2 .0$ to $10.12 .3 .255$?$10.12 .2 .0 / 23$...

SarthakShastri

2.3k views

SarthakShastri answered Apr 21

0 votes

0 answers

4

Why is the bandwidth of the pre-established reserved link divided on multiple new connections?
I am reading Kurose Computer Networking book 8e, on page number 57, under 1.3.2 Circuit Switching Because it link has $4$ circuits, for each link used by the end-to-end ... in circuit switching affect the network's scalability compared to packet switching, where bandwidth is shared dynamically?

I am reading Kurose Computer Networking book 8e, on page number 57, under 1.3.2 Circuit SwitchingBecause it link has $4$ circuits, for each link used by the end-to-end co...

tbhaxor

49 views

tbhaxor asked Apr 19

36 votes

7 answers

5

GATE CSE 2016 Set 2 | Question: 24
In an Ethernet local area network, which one of the following statements is TRUE? A station stops to sense the channel once it starts transmitting a frame. The purpose of the jamming signal is to pad the frames that are ... the packet even after the collision is detected. The exponential back off mechanism reduces the probability of collision on retransmissions.

In an Ethernet local area network, which one of the following statements is TRUE?A station stops to sense the channel once it starts transmitting a frame.The purpose of t...

geetaseshapallli

11.3k views

geetaseshapallli answered Apr 19

0 votes

1 answer

6

question on Supernetting
You have the following four contiguous networks: $10.0.0.0/24$ $10.0.1.0/24$ $10.0.2.0/24$ $10.0.3.0/24$ What is the supernet address that can represent all these networks?

You have the following four contiguous networks:$10.0.0.0/24$$10.0.1.0/24$$10.0.2.0/24$ $10.0.3.0/24$What is the supernet address that can represent all these networks?

manishankarkanrar

126 views

manishankarkanrar answered Apr 19

0 votes

1 answer

7

Network Addressing
What is the Network ID for the network denoted by 192.168.242.5/20? a)192.168.242.0 b)192.168.240.0 c)192.168.226.0 d)192.168.192.0

What is the Network ID for the network denoted by 192.168.242.5/20? a)192.168.242.0b)192.168.240.0c)192.168.226.0d)192.168.192.0

archiii

108 views

archiii answered Apr 16

2 votes

2 answers

8

GATE CSE 2024 | Set 2 | Question: 44
Consider a $\text{TCP}$ connection operating at a point of time with the congestion window of size $12$ $\text{MSS}$ (Maximum Segment Size), when a timeout occurs due to packet loss. Assuming that all the segments transmitted in the next ... Time) are acknowledged correctly, the congestion window size (in $MSS$) during the third $\text{RTT}$ will be __________.

Consider a $\text{TCP}$ connection operating at a point of time with the congestion window of size $12$ $\text{MSS}$ (Maximum Segment Size), when a timeout occurs due to ...

satyaAchar

1.9k views

satyaAchar answered Apr 13

0 votes

1 answer

9

does ack sent by the reciver contains crc

Priya03

71 views

Priya03 answered Apr 11

0 votes

3 answers

10

GATE CSE 2024 | Set 1 | Question: 26
Consider a network path $\mathrm{P}-\mathrm{Q}-\mathrm{R}$ between nodes $\mathrm{P}$ and $\mathrm{R}$ via router $\mathrm{Q}$. Node $\mathrm{P}$ sends a file of size $10^6$ bytes to $\text{R}$ via this path by splitting the file into chunks of ... $3$ decimal places) at which $\mathrm{R}$ receives all the chunks of the file? $8.000$ $8.008$ $15.992$ $16.000$

Consider a network path $\mathrm{P}-\mathrm{Q}-\mathrm{R}$ between nodes $\mathrm{P}$ and $\mathrm{R}$ via router $\mathrm{Q}$. Node $\mathrm{P}$ sends a file of size $10...

N SuryaNarayana Raj

2.4k views

N SuryaNarayana Raj answered Apr 9

0 votes

0 answers

11

Why does the transmission rate in the reserved link gets divided when more concurrent connections are established?

I am reading Kurose Computer Networking book 8e, on page number 57, under 1.3.2 Circuit SwitchingBecause it link has $4$ circuits, for each link used by the end-to-end co...

tbhaxor

64 views

tbhaxor asked Apr 7

0 votes

0 answers

12

Link vs Channel in computer networking
While reading computer networking, I am confused between link and channel and seen people using this interchangeably (which often bugs me). Language written in books and forums A link refers to the most basic physical or logical connection between two devices. ... A can connect to B via Ethernet, and A can connect to C via RF. What do you think about this?

While reading computer networking, I am confused between link and channel and seen people using this interchangeably (which often bugs me).Language written in books and f...

tbhaxor

81 views

tbhaxor asked Apr 5

4 votes

1 answer

13

GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 51
Consider the following forwarding table in a router that uses longest prefix matching to forward packets. Assume that 4-bit addressing is used. ... $X=0$ and $Y=00$ $X=01$ and $Y=00$ $X=010$ and $Y=00$ $X=00$ and $Y=0$

Consider the following forwarding table in a router that uses longest prefix matching to forward packets. Assume that 4-bit addressing is used.$$\begin{array}{c|c}\hline ...

Jayaprakash M

405 views

Jayaprakash M answered Apr 5

1 votes

3 answers

14

CN: Go Back N
Station A needs to send a message consisting of 15 packets to station B' using a sling window (window size 4) and go-back-N error control strategy. All packets are ready and immediately available for transmission. If every 6th packet that A' transmits gets lost (but no Acks from ... of packets that A' will transmit for sending the message to B' ? (a) 29 (b) 33 (c) 27 (d) 25

Station A needs to send a message consisting of 15 packets to station ‘B’ using a sling window (window size 4) and go-back-N error control strategy. All packets are r...

akg_011

2.1k views

akg_011 answered Mar 31

1 votes

1 answer

15

distance routing algorithm
statement : distance routing algorithm is adaptive algorithm which consider the load on the network whether the given statement is true or not ?

statement : distance routing algorithm is adaptive algorithm which consider the load on the networkwhether the given statement is true or not ?

sachin486

869 views

sachin486 answered Mar 30

0 votes

0 answers

16

Channel utilisation
I am having problems calculating channel utilization. The question at hand reads as follows: An application using TCP and will send data in windows of 64000 bytes over a 100 Mbit/s link. The round-trip time is 20ms and transmission times can be neglected. What ... windows size / (Bandwidth * RTT) but I am unsure if this is the correct way. Any help would be greatly appreciated.

I am having problems calculating channel utilization. The question at hand reads as follows: An application using TCP and will send data in windows of 64000 bytes over a ...

Ger

99 views

Ger asked Mar 25

3 votes

2 answers

17

MadeEasy Test Series: Computer Networks - Sliding Window
Consider the GBN protocol with sender and receiver window size as 5.Suppose client sends data 0,1,2,3,4 and only data packet 2 is lost and all ACKs are lost. What will be the content of receiver and sender window. Before Senders ... . Sender: 23456 , Receiver : 01234 C. Sender: 23456 , Receiver : 23456 D. Sender: 01234 , Receiver : 23456

Consider the GBN protocol with sender and receiver window size as 5.Suppose client sends data 0,1,2,3,4 and only data packet 2 is lost and all ACKs are lost. What will be...

archiii

3.2k views

archiii answered Mar 12

0 votes

4 answers

18

Computer Networks | Network Layer | Subnetting
X Institute has been assigned the Class B network address 165.87.0.0. X needs to divide the network into eight subnets. What subnet mask should be applied to the network to provide the most hosts subnet? (a) 255.255.192.0 (c) 255.255.240.0 (b) 255.255.224.0 (d) 255.255.248.0

X Institute has been assigned the Class B network address 165.87.0.0. X needs to divide the network into eight subnets. What subnet mask should be applied to the network ...

Vish_777

1.1k views

Vish_777 answered Mar 4

0 votes

0 answers

19

Computer Networks : Using DBA instead of LBA
Going through the concept of LBA (Limited Broadcasting) and DBA (Directed Broadcast Address), if i consider two cases Case 1 : when host A (10.1.2.3) want to send the packet to all the nodes of a DIFFERENT Network (say 11.0.0.0), in ... .255.255) in Case 2, why can't i just use DBA (Directed Broadcasting), making the Destination IP 10.255.255.255 ?

Going through the concept of LBA (Limited Broadcasting) and DBA (Directed Broadcast Address), if i consider two casesCase 1 : when host A (10.1.2.3) want to send the pack...

Yashdeep2000

144 views

Yashdeep2000 asked Mar 2

55 votes

12 answers

20

GATE CSE 2006 | Question: 44
Station $A$ uses $32\; \text{byte}$ packets to transmit messages to Station $B$ using a sliding window protocol. The round trip delay between A and $B$ is $80\; \text{milliseconds}$ and the bottleneck bandwidth on the path between $A$ and $B$ is $128\; \text{kbps}$ . What is the optimal window size that $A$ should use? $20$ $40$ $160$ $320$

Station $A$ uses $32\; \text{byte}$ packets to transmit messages to Station $B$ using a sliding window protocol. The round trip delay between A and $B$ is $80\; \text{mil...

rj2020

27.2k views

rj2020 answered Feb 27

0 votes

0 answers

21

IPv4 Fragmentation
A packet has arrived in which the offset value is 100. Then what's the number of 1st Byte?

A packet has arrived in which the offset value is 100. Then what's the number of 1st Byte?

mridul_negi

144 views

mridul_negi asked Feb 25

0 votes

0 answers

22

#cn

Çșȇ ʛấẗẻ

79 views

Çșȇ ʛấẗẻ asked Feb 24

0 votes

0 answers

23

Is throughput and link utilization is same. What are the other ways to ask efficiency?

HarshaVardhan1908

96 views

HarshaVardhan1908 asked Feb 22

1 votes

1 answer

24

GATE CSE 2024 | Set 2 | Question: 22
Which of the following fields of an $\text{IP}$ header is/are always modified by any router before it forwards the $\text{IP}$ packet? Source $\text{IP}$ Address Protocol Time to Live $\text{(TTL)}$ Header Checksum

Which of the following fields of an $\text{IP}$ header is/are always modified by any router before it forwards the $\text{IP}$ packet?Source $\text{IP}$ Addre...

rexritz

1.9k views

rexritz answered Feb 19

1 votes

0 answers

25

Gate 2024 CSC set 1
TCP client P successfully establishes a connection to TCP server Q. Let Np denote the sequence number in the SYN sent from P to Q. Let No denote the acknowledgement number in the SYN ACK from Q to P. Which of the following statements is/are CORRECT? A. The ... B,C but if the sequence number of syn packet is 65535 then the ack sequence number should be 0 then how B is correct?

TCP client P successfully establishes a connection to TCP server Q. Let Np denote the sequence number in the SYN sent from P to Q. Let No denote the acknowledgement numbe...

DarkRahul

312 views

DarkRahul asked Feb 18

2 votes

2 answers

26

GATE CSE 2024 | Set 1 | Question: 48
Consider the entries shown below in the forwarding table of an $\text{IP}$ router. Each entry consists of an $\text{IP}$ prefix and the corresponding next hop router for packets whose destination $\text{IP}$ address matches the prefix. The notation " ... and $10.1.1.205$. The number of packets forwarded via the next hop router $\mathrm{R} 2$ is __________.

Consider the entries shown below in the forwarding table of an $\text{IP}$ router. Each entry consists of an $\text{IP}$ prefix and the corresponding next hop router for ...

rexritz

2.4k views

rexritz answered Feb 18

1 votes

1 answer

27

GATE CSE 2024 | Set 2 | Question: 18
Which of the following statements about $\text{IPv4}$ fragmentation is/are TRUE? The fragmentation of an $\text{IP}$ datagram is performed only at the source of the datagram The fragmentation of an $\text{IP}$ datagram ... of the datagram The reassembly of fragments is performed at all intermediate routers along the path from the source to the destination

Which of the following statements about $\text{IPv4}$ fragmentation is/are TRUE?The fragmentation of an $\text{IP}$ datagram is performed only at the sourc...

Sachin Mittal 1

2.8k views

Sachin Mittal 1 answered Feb 18

2 votes

1 answer

28

GATE CSE 2024 | Set 1 | Question: 19
$\mathrm{TCP}$ client $\mathrm{P}$ successfully establishes a connection to $\text{TCP}$ server $\mathrm{Q}$. Let $\text{N}_{P}$ denote the sequence number in the $\text{SYN}$ sent from $\mathrm{P}$ to $\mathrm{Q}$. Let $\text{N}_{Q}$ denote the ... $\text{N}_{P}$ The acknowledgement number $\text{N}_{Q}$ is equal to $\text{N}_{P}+1$

$\mathrm{TCP}$ client $\mathrm{P}$ successfully establishes a connection to $\text{TCP}$ server $\mathrm{Q}$. Let $\text{N}_{P}$ denote the sequence number in the $\te...

phaniphani

1.9k views

phaniphani answered Feb 16

3 votes

2 answers

29

GATE CSE 2024 | Set 1 | Question: 6
A user starts browsing a webpage hosted at a remote server. The browser opens a single TCP connection to fetch the entire webpage from the server. The webpage consists of a top-level index page with multiple embedded image objects. Assume that all caches (e.g., DNS cache, browser cache) are ... $\text{(ii), (iv), (i), (iii)}$ $\text{(iv), (ii), (i), (iii)}$

A user starts browsing a webpage hosted at a remote server. The browser opens a single TCP connection to fetch the entire webpage from the server. The webpage consists of...

phaniphani

2.6k views

phaniphani answered Feb 16

3 votes

1 answer

30

GATE CSE 2024 | Set 1 | Question: 21
Which of the following fields is/are modified in the $\text{IP}$ header of a packet going out of a network address translation $\text{(NAT)}$ device from an internal network to an external network? Source $\text{IP}$ Destination $\text{IP}$ Header Checksum Total Length

Which of the following fields is/are modified in the $\text{IP}$ header of a packet going out of a network address translation $\text{(NAT)}$ device from an internal netw...

aniketwaghela

2.2k views

aniketwaghela answered Feb 16

2 votes

1 answer

31

GATE CSE 2024 | Set 2 | Question: 13
Node $\text{X}$ has a $\text{TCP}$ connection open to node $\text{Y}$. The packets from $\text{X}$ to $\text{Y}$ go through an intermediate $\text{IP}$ router $\mathrm{R}$. Ethernet switch $\mathrm{S}$ is the first switch on the network ... the $\text{MAC}$ address of $\mathrm{S}$ The destination $\text{MAC}$ address is the $\text{MAC}$ address of $\mathrm{Y}$

Node $\text{X}$ has a $\text{TCP}$ connection open to node $\text{Y}$. The packets from $\text{X}$ to $\text{Y}$ go through an intermediate $\text{IP}$ router $\mathrm...

Deepak Poonia

3.6k views

Deepak Poonia answered Feb 16

0 votes

1 answer

32

GATE CSE 2024 | Set 1 | Question: 55
Consider sending an $\text{IP}$ datagram of size $1420$ bytes (including $20$ bytes of $\text{IP}$ ... ) has an $\text{MTU}$ size of $360$ bytes. The number of fragments that would be delivered at the receiver is ____________.

Consider sending an $\text{IP}$ datagram of size $1420$ bytes (including $20$ bytes of $\text{IP}$ header) from a sender to a receiver over a path of two links with a rou...

aniketwaghela

2.7k views

aniketwaghela answered Feb 16

0 votes

2 answers

33

sudo gate test series
The bandwidth of a given medium for transferring the data is 100 Mbps. The user starts with pure aloha for transmission after half of the data is transferred user switched to slotted aloha. Then how much throughput will be gain or loss by the user in the second half? A 50% loss B 100% loss 100% gain D 200% gain i am getting 100% tell me what u are getting

The bandwidth of a given medium for transferring the data is 100 Mbps. The user starts with pure aloha for transmission after half of the data is transferred user switche...

nageshhh

947 views

nageshhh answered Feb 10

5 votes

1 answer

34

GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 25
A host uses a variety of protocols to discover information about the network it is connected to. Which of the following statements are TRUE? To perform a DNS lookup, a host must first discover the IP address of its local ... another host in the same subnet, a host must first discover the MAC address of the destination host using ARP.

A host uses a variety of protocols to discover information about the network it is connected to. Which of the following statements are TRUE?To perform a DNS lookup, a hos...

PreyumKr

731 views

PreyumKr answered Feb 8

4 votes

2 answers

35

GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 11
Consider the following network, which consists of two routers (R1 and R2), two switches (S1 and S2), and four hosts (H1, H2, H3, and H4). Suppose H1 wants to send packet to H3, which of the following is ... address of R1 Packet leaving R1 will have destination mac address of R2 Packet leaving R2 will have destination mac address of S2

Consider the following network, which consists of two routers (R1 and R2), two switches (S1 and S2), and four hosts (H1, H2, H3, and H4).Suppose H1 wants to send packet t...

squirrel69

677 views

squirrel69 answered Feb 7

4 votes

1 answer

36

GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 38
Consider a sliding window protocol with a window size of $5$ using cumulative ACKs (and ACK is being sent for each segment). Assume that the retransmission timeout timer is long enough and timeout has not occurred for any ... after data packet 5 Data packet 3 was duplicated by the network ACK packet A3 was duplicated by the network

Consider a sliding window protocol with a window size of $5$ using cumulative ACKs (and ACK is being sent for each segment).Assume that the retransmission timeout timer i...

Priyotosh2001

452 views

Priyotosh2001 answered Feb 7

4 votes

1 answer

37

GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 12
Consider the sender's view of the sequence numbers in Go-Back-N protocol. Suppose the first sequence number in the sender's window is $k$, and the last sequence number in the sender's window is $k+3$. Let a packet with sequence ... must have been sent. If $p_{k+2}$ is not sent, then $p_{k+1}$ must not have been sent.

Consider the sender's view of the sequence numbers in Go-Back-N protocol. Suppose the first sequence number in the sender's window is $k$, and the last sequence number in...

krishnajsw

405 views

krishnajsw answered Feb 6

2 votes

2 answers

38

Subnets
Given an IP address 156.233.42.56 with a subnet mask of 7 bits. How many hosts and Subnets are Possible ? 126 hosts and 510 subnet 128 host and 512 subnet 510 hosts and 126 subnet 512 hosts and 128 Subnet

Given an IP address 156.233.42.56 with a subnet mask of 7 bits. How many hosts and Subnets are Possible ?126 hosts and 510 subnet128 host and 512 subnet510 hosts and 126 ...

akshay_123

2.6k views

akshay_123 answered Jan 30

0 votes

1 answer

39

Gate CSE
Ospf And RIP routing algorithms are which layer protocols?

Ospf And RIP routing algorithms are which layer protocols?

Mrityudoot

130 views

Mrityudoot answered Jan 30

1 votes

1 answer

40

TCP
A TCP segment consisting of 1500 bits of data and 160 bits of header is send to the IP layer ,which appends another 160 bits of header. This is then transmitted through two network,each of which uses 24-bit packet header. The destination network has a maximum packet size of 800 bits. How many bits,including headers,are delivered to the network layer protocol at the destination??

A TCP segment consisting of 1500 bits of data and 160 bits of header is send to the IP layer ,which appends another 160 bits of header. This is then transmitted through t...

prasantkr.singh

435 views

prasantkr.singh answered Jan 29

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