Recent questions and answers in Computer Networks

49 votes

9 answers

1

GATE CSE 2016 Set 1 | Question: 55
A sender uses the Stop-and-Wait $\text{ARQ}$ protocol for reliable transmission of frames. Frames are of size $1000$ ... $100$ milliseconds. Assuming no frame is lost, the sender throughput is ________ bytes/ second.

KunuSwavik answered in Computer Networks 2 days ago

15.4k views

63 votes

10 answers

2

GATE CSE 2014 Set 3 | Question: 27
Every host in an $\textsf{IPv4}$ network has a $1\text{-second}$ resolution real-time clock with battery backup. Each host needs to generate up to $1000$ ... globally unique ID for this purpose. After what period (in seconds) will the identifiers generated by a host wrap around?

atulcse answered in Computer Networks Sep 18

13.4k views

0 votes

0 answers

3

Network Layer - Computer Networks - Tanenbaum
The question states - An IP datagram using Strict source routing option has to be fragmented. Do you think the option is copied into each fragment, or is it sufficient to just put it in the first fragment? Explain your answer. My thinking ... every fragment. I doubt this reasoning and don't see any flaws in my own answer. Where is my answer lacking?

atulcse asked in Computer Networks Sep 16

38 views

2 votes

2 answers

4

Virtual Gate Test Series: Computer Networks - Subnet Mask
Which of the following statements are correct regarding subnet mask $255.255.240.0?$ i. Class A network subnet mask$: 4096$ subnets and $4096$ systems per subnetwork ii. Class B network subnet mask$: 16$ subnets and $4096$ systems per ... network subnet mask$: 1$ subnet and $ 256$ systems per subnetwork All are correct i, ii i, iii ii, iii

rish1602 answered in Computer Networks Sep 7

333 views

9 votes

3 answers

5

GATE CSE 2020 | Question: 55
Consider a $\textsf{TCP}$ connection between a client and a server with the following specifications; the round trip time is $6$ ms, the size of the receiver advertised window is $50$ KB, slow-start threshold at the client is $32$ KB, and the ... the size of the congestion window (in $\text{KB}$) at time $t+60$ ms after all acknowledgements are processed is _______

tusharhigh answered in Computer Networks Aug 18

6.4k views

0 votes

3 answers

6

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

Soumadeep Chatterjee answered in Computer Networks Aug 17

by Soumadeep Chatterjee

951 views

2 votes

2 answers

7

Synchronous transmission
In synchronous transmission, 5 eight bit characters are included in 30 eight bit information characters. If bit rate of sender is 4200 bps, what is the bit rate of receiver ?

Akshara Nair answered in Computer Networks Aug 9

by Akshara Nair

947 views

45 votes

10 answers

8

GATE CSE 2007 | Question: 69
The distance between two stations $M$ and $N$ is $L$ kilometers. All frames are $K$ bits long. The propagation delay per kilometer is $t$ seconds. Let $R$ bits/second be the channel capacity. Assuming that the processing delay is negligible, the $\text{minimum}$ number ... $\lceil \log_2 \frac{2LtR +K}{K} \rceil$ $\lceil \log_2 \frac{2LtR +2K}{2K} \rceil$

Renga98 answered in Computer Networks Jul 31

10.5k views

70 votes

12 answers

9

GATE CSE 2014 Set 1 | Question: 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 _________.

professor answered in Computer Networks Jul 30

25.8k views

8 votes

3 answers

10

mtu
Suppose that host A is connected to a router R 1, R 1 is connected to another router, R 2, and R 2 is connected to host B. Suppose that a TCP message that contains 900 bytes of data and 20 bytes of TCP header is passed to the IP code at host A for ... 512 bytes, including an 8-byte frame header, and link R2-B can support a maximum frame size of 512 bytes including a 12-byte frame header.

kirtipurohit answered in Computer Networks Jul 29

by kirtipurohit

5.1k views

2 votes

2 answers

11

Tanenbaum- Q30(Network layer)
The CPU in a router can process 2 million packets/sec. The load offered to it is 1.5 million packets/sec. If a route from source to destination contains 10 routers, how much time is spent being queued and serviced by the CPUs?

kirtipurohit answered in Computer Networks Jul 29

by kirtipurohit

1.1k views

0 votes

2 answers

12

Andrew S. Tanenbaum Edition 5th Exercise 4 Question 20 (Page No. 352)
How many frames per second can gigabit Ethernet handle? Think carefully and take into account all the relevant cases. Hint: the fact that it is gigabit Ethernet matters.

kirtipurohit answered in Computer Networks Jul 28

by kirtipurohit

357 views

2 votes

1 answer

13

Andrew S. Tanenbaum Edition 5th Exercise 4 Question 19 (Page No. 352)
Some books quote the maximum size of an Ethernet frame as 1522 bytes instead of 1500 bytes. Are they wrong? Explain your answer.

kirtipurohit answered in Computer Networks Jul 28

by kirtipurohit

286 views

0 votes

5 answers

14

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

kirtipurohit answered in Computer Networks Jul 27

by kirtipurohit

2k views

3 votes

2 answers

15

UGCNET-Oct2020-II: 31
Consider a code with only four valid code words: $0000000000$, $0000011111$, $1111100000$, and $1111111111$. This code has distance $5$. If the code word arrived is $0000000111$ then the original code word must be _______ $0000011111$ $0000000000$ $1111100000$ $1111111111$

snipereye answered in Computer Networks Jul 26

785 views

2 votes

1 answer

16

ISI2018-PCB-CS9
The data link layer uses a fixed-size sliding window protocol, where the window size for the connection is equal to twice the bandwidth-delay product of the network path. Consider the following three scenarios, in each of which only the given parameter changes as specified (no ... minimum value of the round trip time $R$ increases to $1.8R$; the window size $W$ decreases to $W/3$

rish1602 answered in Computer Networks Jul 23

447 views

1 vote

2 answers

17

Ace Test Series: Computer Networks - Tcp
Can someone explain what this question means?

rish1602 answered in Computer Networks Jul 23

294 views

0 votes

3 answers

18

UGCNET-Jan2017-III: 30
A node $X$ on a $10$ Mbps network is regulated by a token bucket. The token bucket is filled at a rate of $2$ Mbps. Token bucket is initially filled with $16$ megabits. The maximum duration taken by $X$ to transmit at full rate of $10$ Mbps is ______secs. $1$ $2$ $3$ $4$

ShouvikSVK answered in Computer Networks Jul 19

413 views

1 vote

4 answers

19

Stop and wait
if packet size is 1KB and propogation time 15msec, channel capacity 10^9 b/s , find transmission time and sender utilization in stop and wait protocol ?

asqwer answered in Computer Networks Jul 19

by asqwer

560 views

1 vote

3 answers

20

Andrew S. Tanenbaum Edition 5th Exercise 6 Question 30 (Page No. 609)
Consider the effect of using slow start on a line with a 10-msec round-trip time and no congestion. The receive window is 24 KB and the maximum segment size is 2 KB. How long does it take before the first full window can be sent?

asqwer answered in Computer Networks Jul 17

by asqwer

322 views

3 votes

3 answers

21

Virtual Gate Test Series: Computer Networks - Subnet Mask(Host Id)
In a class $C$ address, $3$ bits are borrowed for subnetting of host id part. Total possible number of subnet masks are _________________.

asqwer answered in Computer Networks Jul 17

by asqwer

229 views

3 votes

1 answer

22

subnet-mask
For class B network, all even bit positions are selected for subnet mask bits. What is the possible subnet mask? (A) 255.25.170.170 (B) 255.255.85.85 (C) 255.255.255.240 (D) None

asqwer answered in Computer Networks Jul 17

by asqwer

434 views

2 votes

3 answers

23

Virtual Gate Test Series: Computer Networks - Subnet Mask
For class $B$ network, all even bit positions are selected for subnet mask bits. What is the possible subnet mask? $(A) 255.25.170.170$ $(B) 255.255.85.85$ $(C) 255.255.255.240$ $(D)$ None In this question, my doubt is how we can assign subnet mask like this can we? Subnet bits should be taken in continuation from host bits right?

asqwer answered in Computer Networks Jul 17

by asqwer

191 views

3 votes

3 answers

24

Made Easy Computer Networks
For an IP address 197.111.121.199 and subnet mask 255.255.255.240 of a Class A network, what is the 1st subnet ID, 2nd subnet ID, last subnet ID and IP address of last host of last subnet?

rish1602 answered in Computer Networks Jul 16

388 views

43 votes

10 answers

25

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? $20$ $40$ $160$ $320$

kishanbaranwal answered in Computer Networks Jul 15

by kishanbaranwal

18k views

59 votes

6 answers

26

GATE IT 2004 | Question: 85
Consider a simplified time slotted MAC protocol, where each host always has data to send and transmits with probability $p$ = $0.2$ in every slot. There is no backoff and one frame can be transmitted in one slot. If more than one host transmits in the same slot, then ... if each host has to be provided a minimum throughput of $0.16$ frames per time slot? $1$ $2$ $3$ $4$

Jyotish Ranjan answered in Computer Networks Jul 13

by Jyotish Ranjan

9.7k views

2 votes

2 answers

27

Andrew S. Tanenbaum Edition 5th Exercise 6 Question 31 (Page No. 609)
Suppose that the TCP congestion window is set to 18 KB and a timeout occurs. How big will the window be if the next four transmission bursts are all successful? Assume that the maximum segment size is 1 KB.

Penan Rajput answered in Computer Networks Jul 11

by Penan Rajput

369 views

0 votes

1 answer

28

Kurose and Ross Edition 6 Exercise 2 Question R20 (Page No 170)
Look over your received emails, and examine the header of a message sent from a user with a .edu email address. Is it possible to determine from the header the IP address of the host from which the message was sent? Do the same for a message sent from a Gmail account.

Penan Rajput answered in Computer Networks Jul 11

by Penan Rajput

152 views

1 vote

3 answers

29

IEEE 802.11
Consider the following statements: S1 : IEEE 802.11 does not uses sequence number. S2 : The amount of data send in one time in limited by RTS frame (data = sender's data + ACK). S3 : IEEE 802.11 uses CSMA/CA medium access protocol. S4 : The ... of collision on retransmissions in ethernet. Which of the following is true? This is from topic- wifi. From where should i study this topic ?

rish1602 answered in Computer Networks Jul 8

2.7k views

6 votes

5 answers

30

Find wrap around time
Consider 100 mbps network with 24 bit sequence number field find the wrap around time for sequence no?

Lakshmi Narayana404 answered in Computer Networks Jul 7

by Lakshmi Narayana404

5.7k views

36 votes

6 answers

31

GATE IT 2007 | Question: 61
In the waveform (a) given below, a bit stream is encoded by Manchester encoding scheme. The same bit stream is encoded in a different coding scheme in wave form (b). The bit stream and the ... Manchester respectively $0111101000$ and Differential Manchester respectively $1000010111$ and Integral Manchester respectively $0111101000$ and Integral Manchester respectively

varunrajarathnam answered in Computer Networks Jul 7

by varunrajarathnam

10.8k views

1 vote

3 answers

32

NIELIT 2016 MAR Scientist B - Section C: 53
In context of TCP/IP computer network models, which of the following is FALSE? Besides span of geographical area, the other major difference between LAN and WAN is that the later uses switching element. A repeater is used just to forward ... to another one. IP layer is connected oriented layer in TCP/IP. A gateway is used to connect incompatible networks.

kbbhatt04 answered in Computer Networks Jul 7

705 views

4 votes

4 answers

33

GATE CSE 2021 Set 1 | Question: 8
Consider the following two statements. $S_1$: Destination $\text{MAC}$ address of an $\text{ARP}$ reply is a broadcast address. $S_2$: Destination $\text{MAC}$ address of an $\text{ARP}$ request is a broadcast address. Which one of the following choices is ... true $S_1$ is true and $S_2$ is false $S_1$ is false and $S_2$ is true Both $S_1$ and $S_2$ are false

Mohitdas answered in Computer Networks Jul 3

2k views

0 votes

1 answer

34

forouzan
Assume the propagation delay in a broadcast network is 5 μs and the frame transmission time is 10 μs. a. How long does it take for the first bit to reach the destination? b. How long does it take for the last bit to reach the destination after the first bit has arrived? c. How long is the network involved with this frame (vulnerable to collision)?

mzfr answered in Computer Networks Jul 2

by mzfr

843 views

0 votes

1 answer

35

MadeEasy Workbook: Computer Networks - Subnetting
A class B network address 130.50.0.0 is submitted as follows. The last 10 bits of the host I'd are allotte for host number and the remaining 6 bits are reserved for subnet number. Q- what are the first hosts address of 1st and 4th subnets? 130.50.4.1 and 130.50.16.1 130.50.1.1 and 130.50.4.1 130.50.0.0 and 130.50.3.0 None of these

Abhrajyoti00 answered in Computer Networks Jul 1

by Abhrajyoti00

856 views

0 votes

2 answers

36

Kurose and Ross Edition 6 Exercise 1 Question P8 (Page No 72)
Suppose users share a 3 Mbps link. Also, suppose each user requires 150 kbps when transmitting, but each user transmits only 10 percent of the time. When circuit switching is used, how many users can be supported? ... (Hint: Use the binomial distribution.) Find the probability that there are 21 or more users transmitting simultaneously.

adittya78 answered in Computer Networks Jun 30

372 views

0 votes

1 answer

37

Kurose and Ross Edition 6 Exercise 1 Question P6 (Page No 72)
This elementary problem begins to explore propagation delay and transmission delay, two central concepts in data networking. Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts are separated by m meters, ... bits, and R = 56 kbps. Find the distance mso that $d _{prop}$ equals $d _{trans}$.

adittya78 answered in Computer Networks Jun 30

326 views

1 vote

2 answers

38

Kurose and Ross Edition 6 Exercise 1 Question P4 (Page No 71)
Consider the circuit-switched network in the Figure below. Recall that there are 4 circuits on each link. Label the four switches A, B, C, and D, going in the clockwise direction. What is the maximum number of ... connections between switches B and D. Can we route these calls through the four links to accommodate all eight connections?

adittya78 answered in Computer Networks Jun 30

213 views

0 votes

1 answer

39

Kurose and Ross Edition 6 Exercise 1 Question P3 (Page No 71)
Consider an application that transmits data at a steady rate (for example, the sender generates an N-bit unit of data every k time units, where k is small and fixed). Also, when such an application starts, it will continue ... data rates is less than the capacities of each and every link. Is some form of congestion control needed? Why?

adittya78 answered in Computer Networks Jun 30

157 views

73 votes

7 answers

40

GATE CSE 2009 | Question: 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 ... sequence numbers used for packets of a connection can increase? $0.015$/s $0.064$/s $0.135$/s $0.327$/s

Praveenjha802 answered in Computer Networks Jun 30

by Praveenjha802

16.3k views

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