Recent questions tagged computer-networks

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1

Computer Network
(Public Key Notation) Alice and Bob are spouses and each making their own wills. They want to send a copy to their attorney Charlie that only Charlie can read and that shows Alice’s will signed by Alice and seen by Bob and Bob’s will signed by Bob and seen by Alice. Using the notation in the slides. What would be the notation of a message that accomplishes this task?

asked 9 hours ago in Computer Networks by manisha11 Active (1.9k points) | 12 views

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2

computer network

asked 10 hours ago in Computer Networks by manisha11 Active (1.9k points) | 11 views

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1 answer

3

Computer Networks
Assume a 10Mbps Ethernet has two nodes, A and B, connected by a 360m cable with three repeaters in between, and they each have one frame of 1,024 bits to send to each other. Further assume that the signal propagation speed across the cable is 2*10^8 m/sec ... an 8-bit processing delay in addition to a store-and-forward delay. At what time, in seconds, is A's packet delivered at B

asked 11 hours ago in Computer Networks by manisha11 Active (1.9k points) | 15 views

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1 answer

4

Computer Network
20 Gbps link each user using 5Gbps when active<20% time the user is active> Max. users that the network can be used by? Using circuit switching?

asked 3 days ago in Computer Networks by manisha11 Active (1.9k points) | 98 views

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5

Data Communications AND Networking by BEHROUZ A. FOROUZAN (5th Edition)
The LLC provides a single link-layer control protocol for all IEEE LANs. This means LLC protocol can provide interconnectivity between different LANs because it makes the MAC sublayer transparent. Does this mean that all the LANs use ... . But don't we see that the frame format of alll are different. So, how is it possbile?

asked 4 days ago in Computer Networks by superak96 (177 points) | 47 views

+1 vote

1 answer

6

In a LAN network every system is identified by ?
In a LAN network every system is identified by (a) Name (b) MAC Address (c) IP Address (d) Serial number given by manufacturer the answer is given as IP address but according to me it should be MAC address.

asked 6 days ago in Computer Networks by *p (35 points) | 50 views

+1 vote

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7

Error Detection Using CRC
For detecting a single bit error using CRC, it is needed that $x^{i}$ should not be divisible by g(x). So, we make g(x) of at least 2 terms, which renders a single term of e(x) indivisible. But then what is the logic behind keeping MSB as 1. ... any single bit indivisible? For example, $x^{3}+x^{2}$ is guarantees to detect a single bit error at any position. Is it not?

asked Feb 7 in Computer Networks by superak96 (177 points) | 87 views

+1 vote

3 answers

8

GATE2019-16
Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)? IMAP POP3 SMTP, POP3 SMTP MIME IMAP, SMTP

asked Feb 7 in Computer Networks by Arjun Veteran (385k points) | 1.5k views

+1 vote

2 answers

9

GATE2019-28
Consider three machines M, N, and P with IP addresses $100.10.5.2, \: 100.10.5.5$, and $100.10.5.6$ respectively. The subnet mask is set to $255.255.255.252$ for all the three machines. Which one of the following is true? M, N, and P all belong to the same subnet Only M and N belong to the same subnet Only N and P belong to the same subnet M, N, and P belong to three different subnets

asked Feb 7 in Computer Networks by Arjun Veteran (385k points) | 1.6k views

+3 votes

8 answers

10

GATE2019-29
Suppose that in an IP-over-Ethernet network, a machine X wishes to find the MAC address of another machine Y in its subnet. Which one of the following techniques can be used for this? X sends an ARP request packet to the local gateway's IP ... ARP request packet with broadcast MAC address it its local subnet X sends an ARP request packet with broadcast IP address in its local subnet

asked Feb 7 in Computer Networks by Arjun Veteran (385k points) | 2.9k views

+2 votes

4 answers

11

GATE2019-49
Consider that $15$ machines need to be connected in a LAN using $8$-port Ethernet switches. Assume that these switches do not have any separate uplink ports, The minimum number of switches needed is ______

asked Feb 7 in Computer Networks by Arjun Veteran (385k points) | 1.7k views

+2 votes

3 answers

12

GATE2019-54
In an RSA cryptosystem, the value of the public modulus parameter $n$ is $3007$. If it is also known as that $\phi(n)=2880$ where $\phi()$ denotes Euler’s Totient Function, then the primary factor of $n$ which is greater than $50$ is _________

asked Feb 7 in Computer Networks by Arjun Veteran (385k points) | 1.7k views

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13

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

asked Feb 5 in Computer Networks by ROHIT SHARMA 5 (149 points) | 218 views

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14

Fragments

asked Feb 2 in Computer Networks by Na462 Loyal (8.6k points) | 42 views

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15

ME adv Test
Suppose that host A is connected to a router R1, R1 is connected to another router R2 and R2 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 layer at host A for delivery to B. Assume ... Offset=63 LENGTH=460; DF=0;MF=0;Offset=60. (Given ans is C can anyone help with this question whether ans is D or C? )

asked Jan 31 in Computer Networks by newdreamz a1-z0 Active (1.6k points) | 38 views

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16

Made easy test series mock congestion control
Consider a TCP connection using the multiplicative additive congestion control algorithm where the window size at the start is 1 MSS and the threshold is 32 MSS. At the 8th transmission timeout occurs and enters in a congestion detection phase. The value of window size (in MSS) at the end of 12th transmission is .

asked Jan 30 in Computer Networks by Ram Swaroop Active (2.3k points) | 53 views

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1 answer

17

Aloha
100 stations on a pure Aloha network share a 1 MBPS channel. if frames are 1000 bits long, find the throughput if each station is sending 10 frames per second

asked Jan 30 in Computer Networks by Jaggi (103 points) | 68 views

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1 answer

18

Applied course
Calculate total time to transmit a 1500 KB file over a link.Assume one way delay in either direction is 40ms .Bandwidth is 1Mbps and packet size including header is 1 KB where header length is 40 Bytes ?

asked Jan 27 in Computer Networks by screddy1313 (401 points) | 47 views

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1 answer

19

10Base5 cable
I think its answers should be 500 m , is any one having idea of this:

asked Jan 26 in Computer Networks by Nandkishor3939 Active (1.2k points) | 38 views

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0 answers

20

self doubt
is it correct solution?

asked Jan 26 in Computer Networks by iamdeepakji (227 points) | 38 views

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1 answer

21

DH algorithm
How to calculate such a value: Please, someone explain because this is not possible on cal….!

asked Jan 26 in Computer Networks by Nandkishor3939 Active (1.2k points) | 61 views

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22

TestBook_FLT
Frames of 20000Bytes are sent over a 10Megabytes per second duplex link between two hosts.Propagation time is 45ms(One-way). Suppose that the sliding window protocol is used with the sender window size of 16 and acknowledgements are always piggybacked.After sending 35 frames, what is the minimum time the sender will have to wait before starting transmission of next frame?

asked Jan 25 in Computer Networks by Ayush Upadhyaya Boss (24.5k points) | 29 views

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23

Count to infinity
Accorsing to Kenneth rosen, poison reverse cant solve count to infinity What is difference between split horizon and poison reverse. Can split horizon solve count to infinity problem? Can split horizon with poison reverse solve count to infinity problem?

asked Jan 24 in Computer Networks by bts1jimin (245 points) | 27 views

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1 answer

24

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

asked Jan 24 in Computer Networks by OneZero Active (1.3k points) | 65 views

+1 vote

0 answers

25

Made easy test series
Consider a source computer (S) transmitting a file of size $2 * 10^6$ bits to a destination computer (D) over a network of three routers ($R_1$, $R_2$ and $R_3$) and four links $(L_1, L_2, L_3 and L_4)$. $L_1$ connects $S$ to $R_1$; $L_2$ ... sum of transmission and propagation delays in transmitting the file from $S$ to $D$? a. 1007 ms b. 1010 ms c. 2010 ms d 2007 ms

asked Jan 24 in Computer Networks by CSHuB (47 points) | 45 views

+1 vote

0 answers

26

TestBook_FLT
A data is sent to UDP,along with a pair of socket address and the length of the data.After receiving data,UDP adds the header and passes the UDP datagram to IP.What is the maximum size of the payload that can be encapsulated in a UDP datagram, to avoid fragmentation. ... $1500-20-8=1472\,Bytes$ But Answer is given to be $65507$ I know how that figure came but my question is Why that?

asked Jan 22 in Computer Networks by Ayush Upadhyaya Boss (24.5k points) | 76 views

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1 answer

27

Made easy test series computer network gbn Sr sliding window protocol
Consider two computers A and B are connected through a network of 30 Mbps. Assume the distance between them is 3000km and the signal propagation speed is same as the speed of light and the packet size is 12 KB. What is the minimum number of bits ... -N and selective repeat protocol? A . 5 and 6 B. 6 and 7 C. 6 and 6 D. 7 and 8

asked Jan 22 in Computer Networks by Ram Swaroop Active (2.3k points) | 73 views

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0 answers

28

MeTest-MOCK2
When 54 bytes of data is transferred using the UDP protocol, the efficiency is? (In per cent) IN UDP, the maximum datagram size can be $2^{16}-1 \, bytes$ Now to this, 8 Bytes of UDP header is included and this together must fit within $65535\, bytes$ IPv4 ... are actually sending 54 Bytes, so the efficiency of the protocol is $\frac{54}{65507} \times 100(\,in\,\%)$ Am I correct?

asked Jan 22 in Computer Networks by Ayush Upadhyaya Boss (24.5k points) | 110 views

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0 answers

29

Made Easy Test series
I thought 2600 cause after 34, it takes one RTT and size becomes 36 before sending the 14th segment(i.e., segment with window size = 36KB). Questions based on this are confusing. Please clarify.

asked Jan 20 in Computer Networks by Naveen Muralidhar (183 points) | 25 views

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