Recent questions and answers in Computer Networks - GATE Overflow

+20 votes

5 answers

1

GATE2016-1-24
Which one of the following protocols is NOT used to resolve one form of address to another one? DNS ARP DHCP RARP

answered 1 day ago in Computer Networks by indra094 (15 points) | 5.7k views

+23 votes

5 answers

2

GATE2016-2-24
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 smaller than ... transmit the packet even after the collision is detected. The exponential back off mechanism reduces the probability of collision on retransmissions.

answered 1 day ago in Computer Networks by JashanArora Loyal (7k points) | 3.1k views

+2 votes

2 answers

3

TCP Congestion control AIMD
Consider an instance of TCP's Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 2 KB and the threshold at the start of first transmission is 32 KB. Assume that 3 ... transmission and 1 duplicate ACK received during 6th transmission. what is the congestion window size at the end of 10th transmission?

answered 1 day ago in Computer Networks by raju paul (433 points) | 623 views

0 votes

2 answers

4

Help with Jacobson Algorithm _ TCP

answered 2 days ago in Computer Networks by raju paul (433 points) | 210 views

+3 votes

5 answers

5

ISRO2017-28
In networking terminology UTP means Uniquitous teflon port Uniformly terminating port Unshielded twisted pair Unshielded T-connector port

answered 2 days ago in Computer Networks by Nbhardwaj (349 points) | 1.7k views

0 votes

3 answers

6

UGCNET-dec2009-ii-26
Device on one network can communicate with devices on another network via a (A) Hub/Switch (B) Utility server (C) File server (D) Gateway

answered 2 days ago in Computer Networks by Nbhardwaj (349 points) | 447 views

0 votes

2 answers

7

TCP HEADER , FRAME SIZE

answered 2 days ago in Computer Networks by raju paul (433 points) | 167 views

0 votes

1 answer

8

#CN HTTP MCQ
In HTTP, the first line in a request message is called a _______ line; the first line in the response message is called the ________ line.

answered 3 days ago in Computer Networks by Nbhardwaj (349 points) | 40 views

0 votes

2 answers

9

ACE CBT 2018
Identify valid statements pertaining to switching S1: Computer networks are based on packet switching. S2: Packet switching increases the available throughput. (A) Both S1 and S2 (B) S1 only (C) S2 only (D) Neither S1 nor S2

answered 3 days ago in Computer Networks by Nbhardwaj (349 points) | 89 views

0 votes

1 answer

10

GATE 2019
To connect 15 system in local network, how many 8 port switch required...if switch dont have uplink.

answered 3 days ago in Computer Networks by Nbhardwaj (349 points) | 301 views

0 votes

1 answer

11

Circuit Switching
Which of the following statement about circuit switch network is true? 1) Circuit switch network make a client use more more network resources than packet switch network 2) Circuit switch donot require a connection set up for communication 3) Bandwidth in a circuit switch network can be shared between users via TDM 4) Circuit cannot provide strong performance gurantee

answered 3 days ago in Computer Networks by AkashChandraGupta (235 points) | 212 views

+28 votes

4 answers

12

GATE2015-3-38
In the network $200.10.11.144/27$, the $fourth$ octet (in decimal) of the last $IP$ address of the network which can be assigned to a host is _____.

answered 4 days ago in Computer Networks by pritishc Active (2.3k points) | 4.7k views

+38 votes

5 answers

13

GATE2008-IT-84
Host $X$ has IP address $192.168.1.97$ and is connected through two routers $R1$ and $R2$ to another host $Y$ with IP address $192.168.1.80$. Router $R1$ has IP addresses $192.168.1.135$ and $192.168.1.110$. $R2$ ... $255.255.255.224$. Given the information above, how many distinct subnets are guaranteed to already exist in the network? $1$ $2$ $3$ $6$

answered 4 days ago in Computer Networks by pritishc Active (2.3k points) | 3.6k views

+3 votes

3 answers

14

ISRO2020-58
Remote Procedure Calls are used for communication between two processes remotely different from each other on the same system communication between two processes on the same system communication between two processes on the separate systems none of the above

answered 5 days ago in Computer Networks by nkg_master9 (181 points) | 212 views

+2 votes

2 answers

15

computer-networks csma-cd
Consider CSMA/CD LAN with bandwidth 10 Mbps and propagation delay of 5 μsec. Repeaters are not allowed in this system. Data frames are 512 bits long, including 32 bits of header, checksum and other overhead. The first bit slot after a successful ... . The effective data rate of the network is ________ (in Mbps). (Excluding overhead, assuming that there are no collisions)

answered Jan 21 in Computer Networks by Ayan Kumar Pahari (419 points) | 226 views

+1 vote

3 answers

16

ISRO2020-54
Checksum field in TCP header is ones complement of sum of header and data in bytes ones complement of sum of header, data and pseudo header in $16$ bit words dropped from IPv$6$ header format better than md$5$ or sh$1$ methods

answered Jan 20 in Computer Networks by nkg_master9 (181 points) | 245 views

+1 vote

1 answer

17

test series
In a IPv6 protocol communication, If total Router Header length is 448 bits. Then how many routers or hops are there for the packet to reach destination. 3 4 5 2

answered Jan 18 in Computer Networks by ycv005 (23 points) | 160 views

+1 vote

4 answers

18

MadeEasy Test Series: Computer Networks - Network Security
DH key exchange algorithm is used to establish a session between sender and receiver with n=23 and g=5. The sender's secret key is 6 and the receiver's secret key is 15. What is the secret key between the receiver and sender? Please explain with solution P.S: Answer is given as 2

answered Jan 17 in Computer Networks by abdulfahad1 (11 points) | 145 views

+22 votes

6 answers

19

GATE2018-14
Consider the following statements regarding the slow start phase of the TCP congestion control algorithm. Note that cwnd stands for the TCP congestion window and MSS window denotes the Maximum Segments Size: The cwnd increases by $2$ MSS on every successful acknowledgment The cwnd approximately doubles ... are true Only $\text{(iv)}$ is true Only $\text{(i)}$ and $\text{(iv)}$ are true

answered Jan 15 in Computer Networks by JashanArora Loyal (7k points) | 5.9k views

+64 votes

15 answers

20

GATE2016-1-54
For a host machine that uses the token bucket algorithm for congestion control, the token bucket has a capacity of $1$ $\text{megabyte}$ and the maximum output rate is $20$ $\text{megabytes}$ per $\text{second}$. Tokens arrive at a rate to sustain output ... needs to send $12$ $\text{megabytes}$ of data. The minimum time required to transmit the data is _____________ $\text{seconds}$.

answered Jan 15 in Computer Networks by Nitesh Singh 2 Active (4.3k points) | 13.3k views

+5 votes

3 answers

21

Packet Loss in GBN
Q1 >> Station A wants to send 10 packets to station B using Go Back N ARQ, where N = 4. Moreover consider every 4 th packet lost while transmission (ACK's from B never get lost). Calculate the number of transmissions that A has to make in ... s from B never get lost). Calculate the number of transmissions that A has to make in GBN respectively to ensure safe delivery to B.

answered Jan 15 in Computer Networks by raju paul (433 points) | 847 views

+1 vote

2 answers

22

ISRO2020-44
In a columnar transportation cipher, the plain text is “the tomato is a plant in the night shade family”, keyword is “$TOMATO$”. The cipher text is $”TINESAX/EOAHTFX/HTLTHEY/MAIIAIX/TAPNGDL/OSTNHMX”$ $”TINESAX/EOAHTFX/MAIIAIX/HTLTHEY/TAPNGDL/OSTNHMX”$ $”TINESAX/EOAHTFX/HTLTHEY/MAIIAIX/OSTNHMX/TAPNGDL”$ $”EOAHTFX/TINESAX/HTLTHEY/MAIIAIX/TAPNGDL/OSTNHMX”$

answered Jan 14 in Computer Networks by Ashwani Kumar 2 Boss (16.4k points) | 134 views

+2 votes

2 answers

23

ISRO2020-53
The persist timer is used in TCP to To detect crashes from the other end of the connection To enable retransmission To avoid deadlock condition To timeout FIN_WAIT$1$ condition

answered Jan 13 in Computer Networks by Tuhin Dutta Boss (10.7k points) | 158 views

+1 vote

1 answer

24

RPSC Programmer Exam 2013
A local area network operates Ethernet with CSMA/CD mechanism and runs at a transmission rate of 8 Mbps and a one-way signal propagation time of 25 microseconds. How long has a station to wait before trying to access the channel again, after experiencing 5 successive collisions? 1. 125 microseconds. 2. 625 microseconds 3. 800 microseconds 4. 1600 microseconds.

answered Jan 13 in Computer Networks by raju paul (433 points) | 58 views

+2 votes

1 answer

25

ISRO2020-45
Avalanche effect in cryptography refers Large change in cipher text when the keyword is changed minimally Large changes in cipher text when the plain text is changed Large Impact of keyword change to length of the cipher text None of the above

answered Jan 13 in Computer Networks by `JEET Boss (19.2k points) | 168 views

+28 votes

8 answers

26

GATE2012-10
The protocol data unit (PDU) for the application layer in the Internet stack is: Segment Datagram Message Frame

answered Jan 10 in Computer Networks by Mk Utkarsh Boss (36.6k points) | 3.7k views

+2 votes

3 answers

27

Sockets: UDP and TCP
From where should I study TCP and UDP socket. I am unable to distinguish bind(),connect(),listen() etc . . plz help me . . Can anyone provide me the good source or links for it.

answered Jan 8 in Computer Networks by kashyap02 (221 points) | 446 views

+31 votes

9 answers

28

GATE2006-44
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? $20$ $40$ $160$ $320$

answered Jan 5 in Computer Networks by `JEET Boss (19.2k points) | 9.5k views

+2 votes

3 answers

29

ISRO2018-44
Station$A$ uses $32$ byte packets to transmit messages to Station $B$ using a sliding window protocol. The round trip delay between $A$ and $B$ is $80$ $ms$ and the bottleneck bandwidth on the path between $A$ and $B$ is $128$ $kbps$. What is the optimal window size that $A$ should use? $20$ $40$ $160$ $320$

answered Jan 5 in Computer Networks by `JEET Boss (19.2k points) | 655 views

+1 vote

1 answer

30

NTA NET DEC 2019 (DES)
The Data Encryption Standard (DES) has a function consists of four steps. Which of the following is correct order of these four steps? An expansion permutation, S boxes, an XOR operation, a straight permutation An expansion permutation, an XOR ... - boxes, an XOR operation, an expansion permutation A straight permutation, an XOR operation, S boxes, an expansion permutation

answered Dec 30, 2019 in Computer Networks by `JEET Boss (19.2k points) | 66 views

0 votes

1 answer

31

NTA NET 2018 firewall
Which of the following is/are true Firewalls can screen traffic going into or out of an organization. Virtual private networks can simulate an old leased network to provide certain properties. a)i only b) ii only c)neither d)both

answered Dec 28, 2019 in Computer Networks by `JEET Boss (19.2k points) | 60 views

0 votes

2 answers

32

Andrew S. Tanenbaum Edition 5th Exercise 4 Question 25 (Page No. 352)
Suppose that an 11-Mbps 802.11b LAN is transmitting 64-byte frames back-to-back over a radio channel with a bit error rate of 10−7. How many frames per second will be damaged on average?

answered Dec 28, 2019 in Computer Networks by Sambhrant Maurya Active (3.9k points) | 139 views

+3 votes

1 answer

33

$\textbf{NTA NET DEC 2019}\;\;\;$ $\mathbf{ (7^{17}\; mod \;561)}$
$\mathbf{Que39}$ Let $\mathrm{a^{2c}\;mod\;n = a(a^c)^2\;mod\;n}$ and $\mathrm{a^{2c+1}\;mod\;n = a(a^c)^2\;mod\;n}$. For $\mathrm{a = 7, b = 17}$ and $\mathrm{n = 561}$. What is the value of $\mathrm{a^b(mod\;n)}$. $1) 160\;\;\; 2) 166 \;\;\; 3 ) 157 \;\;\; 4 ) 67$

answered Dec 28, 2019 in Computer Networks by `JEET Boss (19.2k points) | 122 views

+30 votes

9 answers

34

GATE2014-3-25
Host A (on TCP/IP v4 network A) sends an IP datagram D to host B (also on TCP/IP v4 network B). Assume that no error occurred during the transmission of D. When D reaches B, which of the following IP header field(s) may be different from that of the original datagram D? TTL Checksum ... $\text{i}$ and $\text{ii}$ only $\text{ii}$ and $\text{iii}$ only $\text{i, ii}$ and $\text{iii}$

answered Dec 28, 2019 in Computer Networks by Mayank0343 Junior (587 points) | 5.4k views

+35 votes

8 answers

35

GATE2014-3-24
A bit-stuffing based framing protocol uses an $\text{8-bit}$ delimiter pattern of $01111110.$ If the output bit-string after stuffing is $01111100101,$ then the input bit-string is: $0111110100$ $0111110101$ $0111111101$ $0111111111$

answered Dec 27, 2019 in Computer Networks by rohith1001 Active (2.1k points) | 5.7k views

+1 vote

1 answer

36

NTA NET DEC 2019 (network security)
Consider the following statements with respect to network security a) Message confidentially means that the sender and the receiver expect privacy. b) Message integrity means that the data must arrive at the receiver exactly as they were sent . c) Message authentication means the receiver ensured ... 2) only (a) and (c) 3) only (b) and (c) 4) (a), (b) and (c)

answered Dec 26, 2019 in Computer Networks by `JEET Boss (19.2k points) | 68 views

+32 votes

7 answers

37

GATE2015-1-1‏9
Suppose two hosts use a TCP connection to transfer a large file . Which of the following statements is/are FALSE with respect to the TCP connection? If the sequence number of a segment is m, then the sequence number of the subsequent segment is always m+1. If the ... sender is always less than or equal to the advertised window. III only I and III only I and IV only II and IV only

answered Dec 25, 2019 in Computer Networks by JashanArora Loyal (7k points) | 4.8k views

+31 votes

10 answers

38

GATE2006-IT-69
A program on machine $X$ attempts to open a $UDP$ connection to port $5376$ on a machine $Y$, and a $TCP$ connection to port $8632$ on machine $Z$. However, there are no applications listening at the corresponding ports on $Y$ and $Z$. An $ICMP$ Port Unreachable error will be generated by $Y$ but not $Z$ $Z$ but not $Y$ Neither $Y$ nor $Z$ Both $Y$ and $Z$

answered Dec 25, 2019 in Computer Networks by JashanArora Loyal (7k points) | 5k views

0 votes

1 answer

39

made easy work book
A resource record of DNS has Time to live field which gives the indication of how stable the record is.Such information which is highly stable is assigned to________

answered Dec 25, 2019 in Computer Networks by abhishek_tyagi (65 points) | 113 views

+60 votes

8 answers

40

GATE2015-3-36
Two hosts are connected via a packet switch with $10^7$ bits per second links. Each link has a propagation delay of $20$ microseconds. The switch begins forwarding a packet $35$ microseconds after it receives the same. If $10000$ bits of data are to ... elapsed between the transmission of the first bit of data and the reception of the last bit of the data in microseconds is ______.

answered Dec 25, 2019 in Computer Networks by JashanArora Loyal (7k points) | 11.6k views

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