Recent questions tagged computer-networks - GATE CSE Doubts

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Data communication and networking by forouzan
11. We have a pure ALOHA network with 100 stations. If Tfr=1μsTfr=1μs, what is the number of frames each station can send to achieve the maximum efficiency. 12. Repeat Exercise 11 for slotted ALOHA. The question is also present in the following link : https://gateoverflow.in/325673/data-communication-and-networking-by-forouzan-12-exercise

asked Feb 14 in Computer Networks by Pratyush Priyam Kuan (803 points) | 8 views

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Made Easy test series -CN
Consider two nodes A and C at a distance 2000m. Suppose station A starts sending a long frame at time t1=0; station C starts sending a long frame at time t2= 3 microseconds. Find the number of bits station A has sent before detecting the collision? Assume, data rate as 10 Mbps and propagation speed 2*10^8 m/s. A) 70 bits B) 65 bits C) 130 bits D) 140 bits

asked Jan 28 in Computer Networks by Rishav_Bhatt (16 points) | 52 views

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Self doubt CN.
Que1) Find efficiency of Ethernet. Que2) Find efficiency of CSMA/CD. Is there any difference in above questions?

asked Jan 26 in Computer Networks by tp21 (269 points) | 12 views

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made easy test series- CN
is the ans 13 or 14?

asked Jan 23 in Computer Networks by Dheeraj Varma (22 points) | 34 views

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Made Easy CBT 2
Consider 2 nodes A and C at a distance 2000 m apart. Suppose station A starts sending a long frame at time $t_{1} = 0$ microsec. Station C starts sending a long frame at time $t_{2}=3$ microsec. What is the no. of bits station A has sent before detecting the collision? Data rate is 10 Mbps and propagation speed is $2 * 10^{8}$ m/s.

asked Jan 20 in Computer Networks by Sambhrant Maurya (396 points) | 69 views

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GO Question CSMA/CD
Can anyone explain the answer to this question Two csma/cd stations are trying to send frames..After each frame is sent they contend for channel using backoff exponential algorithm?What is probability that contention ends on round k? Below is the selected answer Collision always occurs in round 1. ... https://gateoverflow.in/30257/csma-cd

asked Jan 17 in Computer Networks by !KARAN (227 points) | 16 views

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Self Doubt C.N
DVR(distance vector routing) : How many rounds does DVR algorithm runs per period?

asked Jan 17 in Computer Networks by tp21 (269 points) | 7 views

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ACE Test Series Question 8
Anyone please clarify.

asked Jan 17 in Computer Networks by Shivateja MST (108 points) | 23 views

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madeeasy Ccomputer Networks
Assume there are 50 nodes are connected to a 1 km length of the coaxial cable. Using some protocol, each node can transmit 50 frames/second, where the average frame length is 3000 bits. The transmission rate at each node is 100 Mbps. The percentage efficiency of this protocol is ________.

asked Jan 15 in Computer Networks by suchithreddy (7 points) | 9 views

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Self doubt CN
Calculating Efficiency and throughput in case of Sliding window protocol- 1)when link is Half duplex. 2)link is Full duplex. Looking for approach in above case. Thank you!

asked Jan 13 in Computer Networks by tp21 (269 points) | 65 views

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testbook full test 7
Consider an instance of TCP’s Additive increase multiplicative decrease algorithm where window size at the start of slow start phase is 4 MSS and threshold at the start of first transmission is 32 MSS .Assume that time out occurs during 6th transmission and start with 1 MSS.find congestion window at the end of 9th transmission

asked Jan 8 in Computer Networks by abhinav649 (67 points) | 71 views

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Made Easy: CN test
Consider a network system having 4 routers P,Q,R AND S as shown below.Initially,the routers use Distance vector routing and use number of hops as distance metric. Initially, link P-Q was down and all other routers agree P is unreachable.The link P-Q comes ... exchanges need for all the routers to conclude that P is unreachable.What is the value of x and y? How to solve this?

asked Dec 30, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 14 views

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Self Doubt: Bit stuffing (CN)
If the sent data after bit stuffing is 001111101111101 and the flag is 01111110, then what will be the data after de-stuffing? Will it be 00111111111101 or 0011111111111 ? The doubt arises because here the receiver is looking for “0111110” and if the 0 marked in bold is deleted, can the receiver recognize the next 0111110 sequence?

asked Dec 30, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 8 views

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https://erg.abdn.ac.uk/users/gorry/course/exams/EG3561-00-1-Solution.pdf

asked Dec 27, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 21 views

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Applied course Networking
Consider a $10$ Mbps ethernet LAN that has stations attached to a $2.5$ km long coaxial cable. Given that the transmission speed is $2.3*10^8$ m/s and the packet size is $128$ B out of which $30$ B are overhead what is the ... transmission rate. I think when effeciency is 100% then that rate is called Maximum transmission rate. answer given is 5.9 Mbps and 4.94 Mbps

asked Dec 27, 2019 in Computer Networks by Satbir (4.1k points) | 17 views

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Probability that contention ends in round k in CSMA/CD

asked Dec 24, 2019 in Computer Networks by goxul (375 points) | 11 views

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doubt on hamming code question asked at Gateoverflow

asked Nov 21, 2019 in Computer Networks by shaktisingh (90 points) | 30 views

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self doubt-IP
TCP guarantees in-order delivery .. Does IP guarantees inorder delivery .? I think it does,because of the fields(MF(more fragments),fragment offset,and identification number),the receiver can reassemble the packets using the identification number which is on every packet

asked Nov 19, 2019 in Computer Networks by Doraemon (91 points) | 9 views

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CSMA/CD self doubt
https://gateoverflow.in/96569/csma-cd Here in the solution why Data size is taken excluding header and acknowledgement

asked Sep 12, 2019 in Computer Networks by kd..... (18 points) | 13 views

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VirtualGate: Computer Networks
Answer given is 460. Can anyone explain? Getting 424.

asked Aug 31, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 14 views

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3 answers

VirtualGate Test Series: CN
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 effective data rate is _____________________ Mbps (correct to 2 decimal places), excluding overhead, assuming that there are no collisions?

asked Aug 31, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 13 views

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Token Ring in gate 2020
Is token ring there in gate 2020 syllabus?

asked Aug 31, 2019 in Computer Networks by Pratyush Priyam Kuan (803 points) | 26 views

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Made Easy:IP addressing
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 ... , 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, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 15 views

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Self Doubt: Routers and Forwarding
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 ... 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, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 34 views

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Ethernet #http://web.eecs.umich.edu/~zmao/eecs489/MT2/mt2.html

asked Aug 26, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 33 views

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1 answer

Self Doubt: TCP/IP
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, 2019 in Computer Networks by Sambhrant Maurya (396 points) | 26 views

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Computer Networking ,A top down approach by Kurose and Ross,Ethernet topics,self doubt

asked Aug 19, 2019 in Computer Networks by PRANAB NANDY (-32 points) | 11 views

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Do we have Token Passing Access Control Methods in Gate Computer Networks 2020 Syllabus ?

asked Aug 17, 2019 in Study Resources by Sayed Athar (6 points) | 19 views

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Persistent and non-persistent CSMA
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 ... and T2? Can anyone show how to approoach for both ? Ref : https://gateoverflow.in/284688/persistent-and-non-persistent-http

asked Jul 29, 2019 in Computer Networks by user2525 (1.6k points) | 14 views

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Access Control:CSMA/CD
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 ... 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, 2019 in Computer Networks by Arthik Vishwakarma (6 points) | 10 views

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TCP sending data at 1 meghabyte/s, if sequence number starts with 0, how long does it take before sequence goes 7002?

asked Jul 2, 2019 in Computer Networks by Dmmodi (50 points) | 10 views

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1 answer

Computer Networks | Packet routing | Data Link Layer | ISO-OSI | TCP-IP

asked Jun 26, 2019 in Computer Networks by alaysd (6 points) | 18 views

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