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Recent questions and answers in Computer Networks

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1

Computer networks
Is it possible for an organization’s Web server and mail server to have the same alias for a hostname (for example, foo.com)? What would be the type for the RR that contains the hostname of the mail server?

Sagnick12 answered in Computer Networks 13 hours ago

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1 vote

1 answer

2

DRDO CSE 2022 Paper 2 | Question: 27
A transposition cipher (but not a rail-fence cipher) was used to produce the following ciphertext: $\text{X 2! H M E S S S E 2 Y T A 2 I I A}$ The key used was: $5 \; 2 \; 6 \; 3 \; 4 \; 1.$ What was the plaintext used (in English)?

chandira answered in Computer Networks 15 hours ago

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1 answer

3

unacademy AIMT 2
In go back 5, if every 7th packet that is being transmitted is lost and if we have to send 10 packets, then how many transmissions are required____. I’m getting 15 but the given answer is 14

chandira answered in Computer Networks 17 hours ago

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4

#computernetwork, #privateipaddress
private ip address like Class A, Private IP Address: 10.0.0.0 to 10.255.255.255 Class B, Private IP Address: 172.16.0.0 to 172.31.255.255 Class C, Private IP Address: 192.168.0.0 to 192.168.255.255 why not use this private ip address?, please explain in brief… thanks you !

DHRUVITKUMAR YADAV asked in Computer Networks 1 day ago

by DHRUVITKUMAR YADAV

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1 answer

5

One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field ? It can be used to prioritize packets It can be used to reduce delays It can be used to optimize throughput It can be used to prevent packet looping

psk2024 answered in Computer Networks 3 days ago

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1 answer

6

#tokenring
In a token ring access control method ,if we want to calculate total time as it's used in efficiency calculation, what's the use of a data packet moving in the ring and coming back to same point again and so that we can calculate the total time. I'm bit confused of what's the point of moving in the same ring

chandira answered in Computer Networks Mar 21

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7

#computer-networks #token-ring
In a token ring access control method ,if we want to calculate total time as it's used in efficiency calculation, what's the use of a data packet moving in the ring and coming back to same point again and so that we can calculate the total time. I'm bit confused of what's the point of moving in the same ring

Srken asked in Computer Networks Mar 21

by Srken

21 views

4 votes

1 answer

8

GATE CSE 2023 | Question: 42
Suppose in a web browser, you click on the $\textsf{www. gate-2023.in}\; \text{URL}$. The browser cache is empty. The $\text{IP address}$ for this $\text{URL}$ is not cached in your local host, so a $\text{DNS}$ lookup is triggered (by the ... $5$ parallel $\text{TCP}$ connections. $6\; \text{RTT}$s, in case of persistent $\text{HTTP}$ with pipelining.

nihal_chourasiya answered in Computer Networks Mar 21

by nihal_chourasiya

2.2k views

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2 answers

9

Computer Networks
Answer given is d (Question From PW)

Mr_Engineer answered in Computer Networks Mar 16

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1 vote

1 answer

10

Subnets
Consider the following table with subnets Subnet Subnet Id Subnet Mask $ A$ 150.60.160.0 255.255.240.0 $B $ 150.60.164.0 255.255.252.0 $C $ 150.160.168.0 255.255.252.0 Can we say subnet C exists inside subnet A?

Mr_Engineer answered in Computer Networks Mar 16

108 views

1 vote

1 answer

11

DRDO CSE 2022 Paper 2 | Question: 25
Assume when encrypting $3$-bit plaintext with a block cipher with key $\text{K},$ ... with key $\mathrm{K}$ in counter mode (with initial counter value $=0):$ $\text{C}=100110000$ What was the plaintext?

AGNIDEB MUKHERJEE answered in Computer Networks Mar 15

by AGNIDEB MUKHERJEE

84 views

44 votes

5 answers

12

GATE CSE 2003 | Question: 27
Which of the following assertions is FALSE about the Internet Protocol (IP)? It is possible for a computer to have multiple IP addresses IP packets from the same source to the same destination can take different routes in the network IP ensures that a ... set the route of an outgoing packets; the route is determined only by the routing tables in the routers on the way

GauravRajpurohit answered in Computer Networks Mar 12

by GauravRajpurohit

12.6k views

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1 answer

13

A slotted ALOHA network transmits 200-bit frames using a shared channel with a 200- kbps bandwidth. Find the throughput if the system (all stations together) produces a. 1000 frames per second b. 500 frames per second c. 250 frames per second

Bharat Bhushan answered in Computer Networks Mar 11

by Bharat Bhushan

119 views

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2 answers

14

Which of the following is the broadcast address for a Class B network ID using the default subnetmask? (a) 172.16.10.255 (b) 255.255.255.255 (c) 172.16.255.255 (d) 172.255.255.255

Bharat Bhushan answered in Computer Networks Mar 10

by Bharat Bhushan

195 views

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2 answers

15

An organization is requires 8 subnet each having at least 63 hosts. If the allotted IP address is 193.1.1.0 determine the class of IP address, default mask, subnet mask, number of subnet id bits, and the broadcast address of the subnets.

Bharat Bhushan answered in Computer Networks Mar 10

by Bharat Bhushan

430 views

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2 answers

16

Suppose an ISP owns the block of addresses of the form 131.210.16.0/21. Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. i. What are the prefixes (of form a.b.c.d/x) for the four subnets? ii. What is the number of host address that can be supported per subnet?

Bharat Bhushan answered in Computer Networks Mar 10

by Bharat Bhushan

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1 answer

17

Which of the following describe the DHCP Discover message? 1) It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast. I uses UDP as the Transport layer protocol. It uses TCP as the Transport layer protocol. It does not use a layer 2 destination address. [A]. 1 only [B]. 1 and 2 @ [C]. 3 and 4 [D]. 4 only

Bharat Bhushan answered in Computer Networks Mar 9

by Bharat Bhushan

156 views

0 votes

1 answer

18

Get command is found in a) tcp/ip b) ftp c) mac d) asp

Bharat Bhushan answered in Computer Networks Mar 9

by Bharat Bhushan

86 views

1 vote

1 answer

19

DRDO CSE 2022 Paper 2 | Question: 19
Both the payload and $2\text{D}$ (even) parity bits are shown below. Some of these bit(s) have been flipped. Indicate the row and column of the flipped bit(s) in format (col, row); e.g., top left bit is $(0,0)$. \[\begin{array}{l} 1000 \; 0001 \; 1111 \; ... 0100 \; 0011 \; 0011 \text { | } 0 \\ \overline{0110 \;0111\; 0101\; 1001 \text { | } 1} \\ \end{array}\]

GauravRajpurohit answered in Computer Networks Mar 6

by GauravRajpurohit

110 views

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1 answer

20

Computer Networks - Andrew Tanenbaum - The Data Link Layer
Consider a bidirectional link that uses Selective Repeat ARQ with a window size of N = 7. Suppose that all frames are one unit long and use a time-out value of 2. Assume that the one-way propagation delay is 0.5 time unit, the ... A sends 8 frame in a row, starting at t = 0. All frames are received correctly, except frame 3 is lost.

Bharat Bhushan answered in Computer Networks Mar 4

by Bharat Bhushan

212 views

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3 answers

21

How segmentation and fragmentation is different in computer networks
How segmentation and fragmentation are different in computer networks Please help!

Bharat Bhushan answered in Computer Networks Mar 4

by Bharat Bhushan

569 views

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1 answer

22

Computer Networks
Question From PW Given :8 th answer is d : 9 th answer is b (Answer seems to be incorrect (I don’t know exactly)).

GauravRajpurohit answered in Computer Networks Mar 3

by GauravRajpurohit

85 views

3 votes

3 answers

23

NIELIT 2018-68
_____ IP address can be used in WAN $256.0.0.1$ $172.16.0.10$ $15.1.5.6$ $127.256.0.1$

dutta18 answered in Computer Networks Mar 3

5.6k views

4 votes

4 answers

24

GATE CSE 2023 | Question: 7
Suppose two hosts are connected by a point-to-point link and they are configured to use $\textsf{Stop-and-Wait}$ protocol for reliable data transfer. Identify in which one of the following scenarios, the utilization of the ... Longer link length and higher transmission rate Shorter link length and lower transmission rate Shorter link length and higher transmission rate

Saiteja529 answered in Computer Networks Feb 17

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1 vote

3 answers

25

GATE CSE 2023 | Question: 55
The forwarding table of a router is shown below. ... to a destination address $200.150 .68 .118$ arrives at the router. It will be forwarded to the interface with $\text{ID}$ __________.

Hira Thakur answered in Computer Networks Feb 16

1.5k views

2 votes

1 answer

26

GATE CSE 2023 | Question: 15
Which of the following statements is/are $\text{INCORRECT}$ about the $\textsf{OSPF (Open Shortest Path First)}$ routing protocol used in the Internet? $\textsf{OSPF}$ implements Bellman-Ford algorithm to find shortest paths. $\textsf{OSPF}$ ... path routing. $\textsf{OSPF}$ is used as an inter-domain routing protocol. $\textsf{OSPF}$ implements hierarchical routing.

himanshu2021 answered in Computer Networks Feb 15

by himanshu2021

1.2k views

1 vote

2 answers

27

GATE CSE 2023 | Question: 40
Suppose you are asked to design a new reliable byte-stream transport protocol like $\text{TCP}.$ This protocol, named $\textsf{myTCP}$, runs over a $100 \mathrm{~Mbps}$ network with Round Trip Time of $150$ ... lengths of the Sequence Number field in the $\textsf{myTCP}$ header? $30$ bits $32$ bits $34$ bits $36$ bits

Shoto answered in Computer Networks Feb 15

by Shoto

1.2k views

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1 answer

28

Networking
Consider the following Statements Statement 1: POP3 server maintains state information between a user agent and the mail server, during a POP3 session. Statement 2: POP3 server does not maintain state information across sessions. 1 Statement 1 is true. 2 Statement 2 is true. 3 Statement 1 is false 4 Statement 2 is false

Sunit Kumar answered in Computer Networks Feb 11

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2 answers

29

Peterson Davie 2.18a
Suppose we want to transmit the message $11100011$ and protect it from errors using the CRC polynomial $x^{3}+1$. (a) Use polynomial long division to determine the message that should be transmitted.

GauravRajpurohit answered in Computer Networks Feb 11

by GauravRajpurohit

276 views

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1 answer

30

pls can u aswer this question
Suppose a source device need to send an IP message with 21,000 bytes. Suppose that a local connection has a MTU of 576 bytes. How many fragments are required to send the message over the network?

Shoto answered in Computer Networks Feb 10

by Shoto

156 views

3 votes

1 answer

31

GATE CSE 2023 | Memory Based Question: 46
A link is point-to-point connected and using stop and wait protocol, which of the following correctly states lowest link utilization. Lower link length and lower transmission rate. Lower link length and higher transmission rate. Higher link length and lower transmission rate. Higher link length and higher transmission rate. closed

khushitshah answered in Computer Networks Feb 9

676 views

1 vote

1 answer

32

GATE CSE 2023 | Memory Based Question: 48
3 DNS iterative queries each has RTT time. One HTTP server sending 10 small objects, HTTP server to clieent also takes RTT time. 9 in nonpersistent with 5 parallel connection 7 in non persistent with 5 parallel connection 5 in persistent pipelined 6 in persistent pipelined closed

kathan Mistry answered in Computer Networks Feb 7

by kathan Mistry

821 views

1 vote

0 answers

33

GATE CSE 2023 | Memory Based Question: 47
Which of the following is incorrect in the case of OSPF protocol? OSPF uses the Dijkstra algorithm shortest path algorithm to implement the least cost path routing OSPF uses the Bellman-Ford algorithm to determine the shortest path. OSPF uses an inter-domain routing protocol OSPF employs hierarchical routing closed

GO Classes asked in Computer Networks Feb 6

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2 votes

0 answers

34

MADEEASY
Why B is wrong?

DAWID15 asked in Computer Networks Feb 1

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1 answer

35

Testbook CN question
Which of the following statement is/are incorrect about the Routing Information Protocol (RIP) protocol and Open Shortest Path First (OSPF) protocol? RIP packets are sent using TCP. OSPF packets are sent using TCP. RIP is an Network Layer protocol OSPF is an Application Layer protocol

amruta_solves answered in Computer Networks Jan 31

by amruta_solves

108 views

21 votes

5 answers

36

GATE CSE 2022 | Question: 45
Consider routing table of an organization's router shown below: ... of the subnets in the routing table? $12.20.164.0/20$ $12.20.164.0/22$ $12.20.164.0/21$ $12.20.168.0/22$

Arjit Gupta answered in Computer Networks Jan 31

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1 answer

37

TCP question
Consider the slow start phase for a congestion control in a TCP connection. Initially, the window size is 4 MSS and the threshold is 36 MSS. After which transmission window size reached the threshold limit? 3 4 5 7

Pranavpurkar answered in Computer Networks Jan 31

by Pranavpurkar

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3 answers

38

In stop and wait protocol , every 4th packet is lost.Find number of packets ?
In stop and wait protocol , every 4th packet is lost.If 8 packets are being sent, Find number of packets ? Answer given is : 10 Shouldn't Acknowledgements considered as well , in such case answer should be 18 , Right ?

Sahil_Lather answered in Computer Networks Jan 27

by Sahil_Lather

2.9k views

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0 answers

39

Tcp questions
Consider a client has established TCP connection with a server and sending data. The propagation delay is 5 ms and there are no timeouts and errors during transmission. The size of the receiver advertised window is 128 KB, the slow-start threshold at the client is 64 ... = 10 ms. What is the size of the congestion window (in KB) at time 90 ms after all acknowledgements are processed?

Sahil_Lather asked in Computer Networks Jan 27

by Sahil_Lather

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0 answers

40

RTO in TCP question
A host sends two packets and receives two acknowledgments. The time is shown as hour:minute:seconds. Segment 1 was sent at 0:0:00. Segment 2 was sent at 0:0:07. ACK for segments 1 and 2 received at 0:0:09. Calculate the value of RTO.

Sahil_Lather asked in Computer Networks Jan 27

by Sahil_Lather

60 views

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