Recent questions and answers in Computer Networks

+13 votes

4 answers

1

GATE1992-01,ii
Consider a $3$-$bit$ error detection and $1$-$bit$ error correction hamming code for $4$-$bit$ data. The extra parity bits required would be ___ and the $3$-$bit$ error detection is possible because the code has a minimum distance of ____.

answered 18 hours ago in Computer Networks by kumar-neelabh (11 points) | 2.6k views

+1 vote

5 answers

2

UGCNET-June-2019-II-82
What is the name of the protocol that allows a client to send a broadcast message with its MAC address and receive an IP address in reply? ARP DNS RARP ICMP

answered 2 days ago in Computer Networks by Nbhardwaj (275 points) | 88 views

+1 vote

2 answers

3

UGCNET-June-2019-II-88
What percentage $(\%)$ of the IPv4, IP address space do all class C addresses consume? $12.5 \%$ $25 \%$ $37.5 \%$ $50 \%$

answered 4 days ago in Computer Networks by scholaraniket (183 points) | 68 views

+1 vote

2 answers

4

UGCNET-June-2019-II-85
Consider the following two statements with respect to IPv4 in computer networking: P: The loopback (IP) address is a member of class B network. Q: The loopback (IP) address is used to send a packet from host to itself. What can you say about the statements P and Q? P – True; Q – False P – False; Q – True P – True; Q – True P – False; Q – False

answered 4 days ago in Computer Networks by scholaraniket (183 points) | 64 views

+1 vote

3 answers

5

UGCNET-June-2019-II-83
You are designing a link layer protocol for a link with bandwidth of $1$ Gbps ($10^9$ bits/second) over a fiber link with length of $800$ km. Assume the speed of light in this medium is $200000$ km/second. What is the propagation delay in this link? $1$ millisecond $2$ milliseconds $3$ milliseconds $4$ milliseconds

answered 4 days ago in Computer Networks by scholaraniket (183 points) | 82 views

+2 votes

3 answers

6

UGCNET-June-2019-II-81
A fully connected network topology is a topology in which there is a direct link between all pairs of nodes. Given a fully connected network with $n$ nodes, the number of direct links as a function of $n$ can be expressed as $\frac{n(n+1)}{2}$ $\frac{(n+1)}{2}$ $\frac{n}{2}$ $\frac{n(n-1)}{2}$

answered 4 days ago in Computer Networks by scholaraniket (183 points) | 92 views

0 votes

1 answer

7

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 34 (Page No. 254)
Consider an error-free 64-kbps satellite channel used to send 512-byte data frames in one direction, with very short acknowledgements coming back the other way. What is the maximum throughput for window sizes of 1, 7, 15, and 127? The earth-satellite propagation time is 270 msec.

answered 4 days ago in Computer Networks by aditi19 Active (4.3k points) | 27 views

0 votes

2 answers

8

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 33 (Page No. 254)
Compute the fraction of the bandwidth that is wasted on overhead (headers and retransmissions) for protocol selective repeat on a heavily loaded 50-kbps satellite channel with data frames consisting of 40 header and 3960 data bits. ... frames is 1%, and the error rate for NAK frames is negligible. The sequence numbers are 8 bits.

answered 5 days ago in Computer Networks by aditi19 Active (4.3k points) | 37 views

+1 vote

2 answers

9

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 32 (Page No. 254)
Frames of 1000 bits are sent over a 1-Mbps channel using a geostationary satellite whose propagation time from the earth is 270 msec. Acknowledgements are always piggybacked onto data frames. The headers are very short. Three-bit ... achievable channel utilization for (a) Stop-and-wait? (b) go back n? (c) selective repeat?

answered 5 days ago in Computer Networks by aditi19 Active (4.3k points) | 68 views

0 votes

1 answer

10

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 27 (Page No. 253)
(a) The distance from earth to a distant planet is approximately 9 1010 m. What is the channel utilization if a stop-and-wait protocol is used for frame transmission on a 64 Mbps point-to-point link? Assume ... size will the link utilization be 100%? You may ignore the protocol processing times at the sender and the receiver.

answered 5 days ago in Computer Networks by aditi19 Active (4.3k points) | 25 views

0 votes

1 answer

11

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 22 (Page No. 253)
A 3000-km-long T1 trunk is used to transmit 64-byte frames using Protocol GO back N. If the propagation speed is 6 μsec/km, how many bits should the sequence numbers be?(refer Tanenbaum)

answered 5 days ago in Computer Networks by aditi19 Active (4.3k points) | 11 views

+42 votes

10 answers

12

GATE2014-1-27
Let the size of congestion window of a TCP connection be $32$ KB when a timeout occurs. The round trip time of the connection is $100$ msec and the maximum segment size used is $2$ KB. The time taken (in msec) by the TCP connection to get back to $32$ KB congestion window is _________.

answered 5 days ago in Computer Networks by PRANAV M (175 points) | 10.8k views

0 votes

1 answer

13

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 20 (Page No. 253)
A channel has a bit rate of 4 kbps and a propagation delay of 20 msec. For what range of frame sizes does stop-and-wait give an efficiency of at least 50%?

answered 6 days ago in Computer Networks by aditi19 Active (4.3k points) | 15 views

0 votes

1 answer

14

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 17 (Page No. 253)
A bit stream 10011101 is transmitted using the standard CRC method described in the text. The generator polynomial is x 3 + 1. Show the actual bit string transmitted. Suppose that the third bit from the left is inverted ... . Give an example of bit errors in the bit string transmitted that will not be detected by the receiver.

answered 6 days ago in Computer Networks by aditi19 Active (4.3k points) | 35 views

0 votes

1 answer

15

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 2 (Page No. 352)
The following character encoding is used in a data link protocol: A: 01000111 B: 11100011 FLAG: 01111110 ESC: 11100000 Show the bit sequence transmitted (in binary) for the four-character frame A B ESC FLAG when each of the ... a) Byte count. (b) Flag bytes with byte stuffing. (c) Starting and ending flag bytes with bit stuffing.

answered 6 days ago in Computer Networks by aditi19 Active (4.3k points) | 12 views

0 votes

1 answer

16

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 3 (Page No. 252)
The following data fragment occurs in the middle of a data stream for which the bytestuffing algorithm described in the text is used: A B ESC C ESC FLAG FLAG D. What is the output after stuffing

answered 6 days ago in Computer Networks by aditi19 Active (4.3k points) | 20 views

+1 vote

1 answer

17

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 16 (Page No. 253)
What is the remainder obtained by dividing $x^7 + x ^5 + 1$ by the generator polynomial $x^ 3 + 1?$

answered 6 days ago in Computer Networks by aditi19 Active (4.3k points) | 19 views

0 votes

1 answer

18

Andrew S. Tanenbaum Edition 5th Exercise 3 Question 12 (Page No. 252)
Suppose that data are transmitted in blocks of sizes 1000 bits. What is the maximum error rate under which error detection and retransmission mechanism (1 parity bit per block) is better than using Hamming code? Assume that bit errors are independent of one another and no bit error occurs during retransmission.

answered 6 days ago in Computer Networks by aditi19 Active (4.3k points) | 28 views

0 votes

1 answer

19

GeeksForGeeks IP addressing ...
Which of the following is a public IP? 10.15.14.12 192.168.52.62 173.32.1.1 None

answered 6 days ago in Computer Networks by akshay7797 (15 points) | 105 views

0 votes

3 answers

20

MadeEasy Test Series: Computer Networks - Subnetting
For a class C network if IP address of a computer is 200.99.39.112 and subnet mask is 255.255.255.224 the first host of first subnet (represent last octet) is ________. my question is that whether to take 1st host as '000' ... be 000,so accordingly answer will be 200.99.39.00000001..ANSWER=1 but they had taken 200.99.39.00100001..ANSWER=33

answered Sep 7 in Computer Networks by Priyansh Singh (355 points) | 198 views

+18 votes

3 answers

21

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 Sep 7 in Computer Networks by scholaraniket (183 points) | 2.6k views

+49 votes

7 answers

22

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 Sep 7 in Computer Networks by scholaraniket (183 points) | 9.9k views

+22 votes

8 answers

23

GATE2008-IT-66
Data transmitted on a link uses the following $2D$ parity scheme for error detection: Each sequence of $28$ bits is arranged in a $4\times 7$ matrix (rows $r_0$ through $r_3$, and columns $d_7$ through $d_1$) and is padded with a column $d_0$ and row $r_4$ of ... data received by a receiver and has $n$ corrupted bits. What is the minimum possible value of $n$? $1$ $2$ $3$ $4$

answered Sep 5 in Computer Networks by scholaraniket (183 points) | 3.9k views

+43 votes

4 answers

24

GATE2006-IT-66
A router has two full-duplex Ethernet interfaces each operating at $100$ $\text{Mb/s}$. Ethernet frames are at least $84$ $\text{bytes}$ long (including the Preamble and the Inter-Packet-Gap). The maximum packet processing time at the router for wirespeed forwarding to be possible is (in microseconds) $0.01$ $3.36$ $6.72$ $8$

answered Sep 5 in Computer Networks by Pratyush Priyam Kuan (59 points) | 4.7k views

+26 votes

3 answers

25

GATE2011-2
A layer-$4$ firewall (a device that can look at all protocol headers up to the transport layer) CANNOT block entire $\text{HTTP}$ traffic during $9:00PM$ and $5:00AM$ block all $\text{ICMP}$ traffic stop incoming traffic from specific $\text{IP}$ address but allow ... to the same IP address block $\text{TCP}$ traffic from a specific user on a multi-user system during $9:00PM$ to $5:00AM$

answered Sep 4 in Computer Networks by JashanArora (313 points) | 5.8k views

+52 votes

14 answers

26

GATE2009-57, ISRO2016-75
Frames of $\text{1000 bits}$ are sent over a $10^6$ $\text{bps}$ duplex link between two hosts. The propagation time is $\text{25 ms}$. Frames are to be transmitted into this link to maximally pack them in transit (within the link). What is the minimum ... distinctly? Assume that no time gap needs to be given between transmission of two frames. $I=2$ $I=3$ $I=4$ $I=5$

answered Sep 4 in Computer Networks by Pratyush Priyam Kuan (59 points) | 14.3k views

+2 votes

3 answers

27

UGCNET-June-2019-II-84
You need $500$ subnets, each with about $100$ usable host address per subnet. What network mask will you assign using a class B network address? $255.255.255.252$ $255.255.255.128$ $255.255.255.0$ $255.255.254.0$

answered Sep 3 in Computer Networks by bibin765 (29 points) | 101 views

+1 vote

1 answer

28

computer networks
onsider the following statements with respect to TCP sliding window: S1: Silly window syndrome is a problem caused by heavy congestion in the network. S2: Nagle's algorithm is used when silly window syndrome problem is created by the sender. S3: Clark ... the sender can not send any type of segment. Which of the above statement are correct? can anybody explain sily window syndrome

answered Sep 2 in Computer Networks by Shubh28 (11 points) | 65 views

+2 votes

1 answer

29

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 Sep 1 in Computer Networks by Bikram Veteran (70.9k points) | 194 views

+18 votes

5 answers

30

GATE2005-23
Packets of the same session may be routed through different paths in: TCP, but not UDP TCP and UDP UDP, but not TCP Neither TCP nor UDP

answered Sep 1 in Computer Networks by santosh08 (11 points) | 5k views

+1 vote

1 answer

31

MadeEasy Test Series: Computer Networks - Congestion Control
Assume a scenario where the size of congestion window of a TCP connection be 40 KB when a timeout occurs. The maximum segment size (MSS) be 2 KB. Let the propagation delay be 200 msec. The time taken by the TCP connection to get ... . I think answer should be 5600. But 6000 is given. They have added the last RTT also. Will it be added?

answered Aug 31 in Computer Networks by Subhadeep Roy (11 points) | 247 views

+1 vote

1 answer

32

Madeesay Test Series
Consider TCP implements an extension that allows window size much larger than 64KB. Suppose you are using this extended TCP over a 1Gbps link with a latency of 50ms to transfer a 10 MB file and TCP receive window is 1MB. If TCP sends 1KB packet ... multiplied by link latency, then effective throughput of transfer is x Mbps. Find x. (Assuming no congestion and no lost packets)

answered Aug 31 in Computer Networks by Sambhrant Maurya Active (2.7k points) | 212 views

0 votes

1 answer

33

Kurose and Ross Edition 6 Exercise 3 Question R17 (Page No 287)
Suppose two TCP connections are present over some bottleneck link of rate R bps. Both connections have a huge file to send (in the same direction over the bottleneck link). The transmissions of the files start at the same time. What transmission rate would TCP like to give to each of the connections?

answered Aug 31 in Computer Networks by Silpacharan (23 points) | 51 views

+4 votes

1 answer

34

The Gate Academy
Consider 3 employees Ramesh, Suresh and Mahesh using three different computers working under Account-Network serviced by a single mail server. Assume Ramesh wish to send e-mail to Sonali, Suresh to Pooja and Mahesh to Vidhi, where Sonali, Pooja and Vidhi working ... connections that should be opened to enable this e-mail exchange if all the persons use a non-HTTP e-mail service?

answered Aug 31 in Computer Networks by Sambhrant Maurya Active (2.7k points) | 87 views

+1 vote

2 answers

35

UGCNET-Dec2012-II-43
Data Encryption Techniques are particularly used for _____ protecting data in Data Communication System reduce Storage Space Requirement enhances Data Integrity decreases Data Integrity

answered Aug 31 in Computer Networks by GoalSet1 (163 points) | 661 views

0 votes

1 answer

36

Transport layer
What does this line means? UDP is no-frills extension of "best effort" IP

answered Aug 26 in Computer Networks by Akash Ghosh (37 points) | 33 views

0 votes

3 answers

37

Sliding Window Protocol Question 1
Consider 1 Mbps error-free line , The maximum frame size is 1000 bits .New packets are generated about 1 second apart . Timeout interval is 10m/sec if the special acknowledgement timer were eliminated unnecessary timout would occur . How any times average msg would have been transimitted ? a) Only once b) Twice C) thrice d) None

answered Aug 26 in Computer Networks by Akash Ghosh (37 points) | 668 views

+41 votes

6 answers

38

GATE2009-58
Frames of $1000\text{ bits}$ are sent over a $10^6$ bps duplex link between two hosts. The propagation time is $25ms$. Frames are to be transmitted into this link to maximally pack them in transit (within the link). Let $I$ be the minimum ... wait before starting transmission of the next frame? (Identify the closest choice ignoring the frame processing time) $16ms$ $18ms$ $20ms$ $22ms$

answered Aug 26 in Computer Networks by JashanArora (313 points) | 8k views

+28 votes

6 answers

39

GATE2009-48
Let $G(x)$ be the generator polynomial used for CRC checking. What is the condition that should be satisfied by $G(x)$ to detect odd number of bits in error? $G(x)$ contains more than two terms $G(x)$ does not divide $1+x^k$, for any $k$ not exceeding the frame length $1+x$ is a factor of $G(x)$ $G(x)$ has an odd number of terms.

answered Aug 26 in Computer Networks by JashanArora (313 points) | 7.1k views

+43 votes

6 answers

40

GATE2009-47
While opening a $TCP$ connection, the initial sequence number is to be derived using a time-of-day (ToD) clock that keeps running even when the host is down. The low order $32$ bits of the counter of the ToD clock is to be used for the initial sequence numbers. The clock ... at which sequence numbers used for packets of a connection can increase? $0.015$/s $0.064$/s $0.135$/s $0.327$/s

answered Aug 26 in Computer Networks by JashanArora (313 points) | 8k views

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