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1 answer

1

self doubt
when we convert er model into relational model in 1 to many relationship why we add reltionship atribute to many side entity? like in this image we relationship in employee table why cant we add relationship with department table

asked in Databases Oct 5, 2018

604 views

0 votes

1 answer

2

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)?

asked in Computer Networks Sep 14, 2018

3.5k views

0 votes

0 answers

3

forouzan
Assume that the probability that a bit in a data unit is corrupted during transmission is p. Find the probability that x number of bits are corrupted in an nbit data unit for each of the following cases. a. n = 8, x = 1, p = 0.2 b. n = 16, x = 3, p = 0.3 c. n = 32, x = 10, p = 0.4

asked in Computer Networks Sep 13, 2018

1.0k views

0 votes

1 answer

4

self doubt
i have one doubt , as we know ip address has given to every device which has been connected to internet as well as ip is unique then why we using data link address for forwarding we can use ip address for forwarding(doing by router) and completely eliminate the data link layer. why we need one extra layer (data link layer) as forwarding of packet also done by router.

asked in Computer Networks Sep 13, 2018

185 views

0 votes

1 answer

5

forouzan
Assume we want to connect two isolated hosts together to let each host communicate with the other. Do we need a link-layer switch between the two? Explain.

asked in Computer Networks Sep 12, 2018

2.3k views

1 vote

0 answers

6

frouzen
A path in a digital circuit-switched network has a data rate of 1 Mbps. The exchange of 1000 bits is required for the setup and teardown phases. The distance between two parties is 5000 km. Answer the following questions if the propagation speed is 2 108 m: a. ... of data for each of the above cases and compare them. What can you infer? someone please explain the meaning of last part (d)

asked in Computer Networks Sep 12, 2018

1.2k views

0 votes

0 answers

7

forouzan
can some plz explain "Two Isolated Single-Bit Errors" "If a generator cannot divide xt +1 (t between 0 and n -1), then all isolated double errors can be detected." not able to get this line.

asked in Computer Networks Aug 22, 2018

471 views

0 votes

0 answers

8

forouzan
Which signal has a wider bandwidth, a sine wave with a frequency of 100 Hz or a sine wave with a frequency of 200 Hz?

asked in Computer Networks Aug 19, 2018

537 views

1 vote

0 answers

9

self doubt
please someone explain this i dont understand the solution

asked in Theory of Computation Jan 3, 2018

109 views

0 votes

0 answers

10

graph theory
if graph have articulation point then will it be hamiltonian graph?

asked in Algorithms Dec 24, 2017

208 views

0 votes

0 answers

11

operating system
meeting progress implies solution is deadlock free? (true / false)

asked in Operating System Dec 22, 2017

368 views

0 votes

0 answers

12

general
does anyone have ecil previous year paper? if someone have please share.

asked in Compiler Design Dec 21, 2017

128 views

1 vote

1 answer

13

true data dependency

asked in CO and Architecture Dec 19, 2017

1.5k views

0 votes

0 answers

14

asked in Computer Networks Dec 13, 2017

607 views

0 votes

2 answers

15

asked in Computer Networks Dec 12, 2017

432 views

4 votes

1 answer

16

cn mac
A 8-node network runs the carrier sense Multiple Access (CSMA) MAC protocol. The maximum data rate of the network is 10 Megabits/s. Including retries, each node sends traffic according to some unknown random process at an average rate of 1 Megabit/s ... packets. What fraction of packets sent by the nodes (including retries) experience a collision?_________% (correct to two decimal places).

asked in Computer Networks Dec 12, 2017

1.1k views

0 votes

0 answers

17

asked in Computer Networks Dec 11, 2017

310 views

0 votes

0 answers

18

asked in Computer Networks Dec 11, 2017

385 views

1 vote

1 answer

19

wrap around time

asked in Computer Networks Dec 11, 2017

1.3k views

0 votes

0 answers

20

slotted aloha
6000 stations are competing for use of single slotted aloha channel. The average station makes 30 requests/hr ,where each request is for 500 us(micro sec) duration. calculate normalized total traffic on channel

asked in Computer Networks Dec 10, 2017

409 views

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