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Recent questions tagged computer-networks

0 votes
1 answer 3 views
https://gateoverflow.in/96569/csma-cd Here in the solution why Data size is taken excluding header and acknowledgement
asked Sep 12 in Computer Networks kd..... 11 points 3 views
0 votes
1 answer 10 views
0 votes
3 answers 5 views
A 2-km-long, 10-Mbps CSMA/CD LAN (not 802.3) has a propagation speed of 200 m/microsec. Repeaters are not allowed in this system. Data frames are 512 bits long, including 32 bits of header, checksum, and other overhead. The first ... frame. The effective data rate is _____________________ Mbps (correct to 2 decimal places), excluding overhead, assuming that there are no collisions?
asked Aug 31 in Computer Networks Sambhrant Maurya 204 points 5 views
0 votes
0 answers 14 views
0 votes
0 answers 2 views
An Internet Service Provider (ISP) is granted a block of addresses starting with 145.75.0.0/16. The ISP needs to distribute these addresses to three groups of customers as follows: (a) The first group has 128 customers; each needs 256 addresses. (b) The second group has 128 customers; each ... 128/24, 32768 (B) 145.75.159.192/26, 16384 (C) 145.75.159.192/26, 32768 (D) 145.75.191.128/25, 16384
asked Aug 30 in Computer Networks Sambhrant Maurya 204 points 2 views
0 votes
2 answers 26 views
Suppose two hosts A and B are connected via a router R and A needs to send 3 packets to B. Transmission delay of each packet=10 ms Propagation delay of each link=2.5 ms Size of each packet: 1000 bits Suppose the router is not store and forward i.e it does ... all the 3 packets be received by host B? What if the router used cut-through switching and it begins to forward after receiving 200 bits?
asked Aug 29 in Computer Networks Sambhrant Maurya 204 points 26 views
0 votes
2 answers 15 views
Suppose nodes A and B are on the same 10 Mbps Ethernet segment and the propagation delay between the two nodes is 225 bit times. Suppose A and B send frames at the same time, the frames collide, and then A and B choose different values of K in the CSMA/CD ... 225+48=273 bit times Suppose K_a=0 and K_b=1. At what time does B schedule its retransmission? At what time does A begin transmission?
asked Aug 26 in Computer Networks Sambhrant Maurya 204 points 15 views
0 votes
1 answer 20 views
What is the minimum and maximum number of packets required to be exchanged for connection establishment, data transfer and connection termination in a TCP 3 way handshake?
asked Aug 25 in Computer Networks Sambhrant Maurya 204 points 20 views
0 votes
0 answers 6 views
Suppose A and B are two stations on some Ethernet. At t=0 A and B start transmitting t=ABC collision occurs t=XYZ A and B received collision signal My question is that how can a station(say A) can able receive a collision signal while it is transmitting some data in a Half Duplex channel. Means both sending and receiving are happening at the same time in half duplex channel. How is it possible?
asked Aug 19 in Computer Networks PRANAB NANDY -32 points 6 views
0 votes
0 answers 4 views
Consider A lives in Delhi, connected to the internet via a 100 Mbps connection retrieve a 250 KB webpage from server in Chennai where page contain 3 images of 500 KB each. Assume one way propagation delay is 75ms and A's access link is the bandwidth bottleneck for ... of T1 and T2? Can anyone show how to approoach for both ? Ref : https://gateoverflow.in/284688/persistent-and-non-persistent-http
asked Jul 29 in Computer Networks user2525 1.5k points 4 views
0 votes
0 answers 7 views
In CSMA/CD protocol in order to detect collision Transmission time should be at least equal to two times Tp, that means we have to change the frame size accordingly. Instead of all this why can't we just place a timer with a time limit of 2 Tp, If there is any ... we need to retransmit. This sounds easier for me as we need not append any additional bits to the frame, Correct me if I am wrong.
asked Jul 29 in Computer Networks Arthik Vishwakarma 6 points 7 views
0 votes
1 answer 7 views
TCP sending data at 1 meghabyte/s, if sequence number starts with 0, how long does it take before sequence goes 7002? (A)5 msec (B)7 msec (C)1.056 sec (D) None of these
asked Jul 2 in Computer Networks Dmmodi 50 points 7 views
0 votes
1 answer 11 views
If IP address is used for routing a data packet from one host to another then why do we need to add MAC address at Data link layer? What is the purpose of MAC address here?
asked Jun 26 in Computer Networks alaysd 6 points 11 views
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