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Recent questions tagged ethernet

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Write a program to simulate the behavior of the CSMA/CD protocol over Ethernet when there are N stations ready to transmit while a frame is being transmitted. Your program should report the times when each station successfully starts sending its frame. Assume that a ... μsec) and a collision detection and sending of a jamming sequence takes one slot time. All frames are the maximum length allowed.
asked Mar 15, 2019 in Computer Networks ajaysoni1924 111 views
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Ethernet frames must be at least 64 bytes long to ensure that the transmitter is still going in the event of a collision at the far end of the cable. Fast Ethernet has the same 64-byte minimum frame size but can get the bits out ten times faster. How is it possible to maintain the same minimum frame size?
asked Mar 15, 2019 in Computer Networks ajaysoni1924 140 views
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An IP packet to be transmitted by Ethernet is 60 bytes long, including all its headers. If LLC is not in use, is padding needed in the Ethernet frame, and if so, how many bytes?
asked Mar 15, 2019 in Computer Networks ajaysoni1924 290 views
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Two CSMA/CD stations are each trying to transmit long (multiframe) files. After each frame is sent, they contend for the channel, using the binary exponential backoff algorithm. What is the probability that the contention ends on round k, and what is the mean number of rounds per contention period?
asked Mar 15, 2019 in Computer Networks ajaysoni1924 141 views
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A 1-km-long, 10-Mbps CSMA/CD LAN (not 802.3) has a propagation speed of 200 m/μsec. Repeaters are not allowed in this system. Data frames are 256 bits long, including 32 bits of header, checksum, and other overhead. The first bit slot after a ... the channel in order to send a 32-bit acknowledgement frame. What is the effective data rate, excluding overhead, assuming that there are no collisions?
asked Mar 15, 2019 in Computer Networks ajaysoni1924 97 views
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What is the length of a contention slot in CSMA/CD for (a) a 2-km twin-lead cable (signal propagation speed is 82% of the signal propagation speed in vacuum)?, and (b) a 40-km multimode fiber optic cable (signal propagation speed is 65% of the signal propagation speed in vacuum)?
asked Mar 15, 2019 in Computer Networks ajaysoni1924 632 views
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“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 the same type of framing, error and flow control. But don’t we see that the frame format of alll are different. So, how is it possbile?
asked Feb 19, 2019 in Computer Networks superak96 235 views
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In Ethernet ..what should be the right condition for collision detection Tt >= 2Tp OR Tt >= 2Tp + Tjam[Tranmission time for jam signal]
asked Dec 31, 2018 in Computer Networks jatin khachane 1 95 views
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You are working on a laptop connected to a $100 \text{Mbps}$ Ethernet LAN. You need a $2 \text{GB}$ file that is on the server in the same LAN. The entire file is also on your pen drive but you have left the pen drive in another room. You ... be able to go and bring the pen drive, before the transfer on the LAN completes. Assume continuous data transmission on the LAN(no packetization required)).
asked Dec 27, 2018 in Computer Networks Ruturaj Mohanty 440 views
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Consider a LAN with 500 stations connected to five 500 m segments. The data rate is 10 Mbps and slot time is 51.2 micro sec, If all the stations transmit With equal probability what is the channel utilization using a frame size of 512 bytes? Note-Number of contention slots are 1.716 how to proceed with these kind of questions?
asked Dec 16, 2018 in Computer Networks aditi19 342 views
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Please someone explain in simplest of terms what is Ethernet Frame and what is Ethernet packet. I can’t visualize them and tell them apart from one and another. Any help would be appreciated. Preamble SFD Destination MAC Source Mac Length field DATA CRC Now what is Ethernet Frame in this and what is Ethernet packet and what’s being received at DLL from Phy layer and NL from Transport layer?
asked Nov 28, 2018 in Computer Networks iarnav 71 views
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What is the maximum number of hosts that can be present in Ethernet LAN?
asked Nov 28, 2018 in Computer Networks iarnav 89 views
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A switch can connect 10Mbps and a 100Mbps link, while a hub cannot. Why? How many Ethernet adaptors can potentially be manufactured? Express it as a power of 2. If the first bit in an Ethernet MAC address is a zero, the address is what type of address? Find the number of collision domains in following two networks.
asked Nov 24, 2018 in Computer Networks John Doe 245 views
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Two stations A, B employing Ethernet standard are competing for access. Suppose, both stations have many frames to send (labelled A1, A2, ... for A and B1, B2, .... for B). Suppose A and B simultaneously transmit their respective first frames and collide. After their ... B1's. Now A is attempting A3, while B is still attempting B1. What is the probability that A3's transmission succeeds over B1's?
asked Nov 24, 2018 in Computer Networks John Doe 91 views
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18
what is baud rate exactly? and what does it signifies?
asked Nov 5, 2018 in Computer Networks aditi19 111 views
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Consider a noisy station that detects transmissions and disrupts them by beginning a competing transmission as soon as it hears the beginning of the transmitted frame, thereby causing a collision. Assume the detector machine, which is on this Ethernet with bandwidth 10 Mbps, detects collision ... wire is 2*10^8 m/s, then the distance( in meters ) of the noisy station from the detector machine is
asked Nov 4, 2018 in Computer Networks Bharat patra 94 views
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2 answers
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Consider two Station communicating via 1 Mbps Satellite link with propagation delay of 270 msec. The Satellite merely serves to retransmit data received from one station to another,with negligible switch delay. If Ethernet frame size is 1024 bits with 3 bit sequence number,then max. possible data throughput is.................
asked Oct 20, 2018 in Computer Networks Na462 304 views
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21
Consider two nodes A and B on the same ethernet segment, and suppose the propagation delay between the two nodes is 225 bit times. Suppose at time both nodes A and B begin to transmit a frame. Assume both nodes transmit a 50-bit jam signal after detecting a collision. For 107 bits per set ethernet, the time at which both nodes A and B sense an idle channel is ________ μsec
asked Oct 15, 2018 in Computer Networks Shivangi Parashar 2 81 views
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In a TDM medium access control bus LAN, each station is assigned one time slot per cycle for transmission. Assume that the length of each time slot is the time to transmit 100bits plus the end-to-end propagation delay. Assume a propagation speed of 2*10^8 m/s ... when we are using Time division multiple access as only one station uses the medium in its slot? please if someone can clear this doubt.
asked Oct 14, 2018 in Computer Networks sushmita 118 views
3 votes
5 answers
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Nodes A and B are connected by a 100MbPs ethernet segment with 6μ μ s propagation delay between them.Suppose A and B send frames at t=0 and frames get collided.After first collision A draws k=0 and B draws k=1(exponential backoff algorithm ) jam signal is ignored and time out time is one RTT then at what time A's packet gets completely delivered to B? Assume packet size is of 1000bits
asked Oct 12, 2018 in Computer Networks Shivangi Parashar 2 365 views
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Q: In a Gigabit Ethernet LAN the average size of frame is 1000 bytes .If a noise of 2 ms occurs on the LAN , how many frame are destroyed ? what will happene if Gigabit Ethernet LAN replaced by a) Fast Ethernet LAN b) Standard Ethernet LAN c) 10 Gigabit Ethernet LAN ?
asked Aug 24, 2018 in Computer Networks Aks9639 225 views
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The round trip propagation delay for a 100Mbps Ethernet having 48-bit jamming signal is 64 ms. What is the minimum frame size (in bytes)?
asked Aug 7, 2018 in Computer Networks Sumit Singh Chauhan 385 views
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Why only hexadecimal number system is used in MAC address in an NIC card and other number system ain't ?
asked Jul 4, 2018 in Computer Networks Devshree Dubey 101 views
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As we know according to backoff algorithm, Suppose there are two stations A and B the range of slots that can be choosen is 0 to 2^n -1 , where n is collision number. My doubt is :- What is the initial value of n(collision number) of each stations A and B? 1 or 0?? What happens to collision number, if A(suppose) wins, is it's n is reinitialized to 1 or 0?
asked Jun 25, 2018 in Computer Networks Sandy Sharma 115 views
1 vote
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Consider the network below, which shows four $10 \hspace{0.1cm} Mbps$ LANs connected by two bridges, labelled $B1$ and $B2$. Assume all users (labelled $1$ through $7$) are very chatty and equally chatty. What is the effective data rate seen by user $4$ ? What is ... effective data rate seen by user $6$ ? What is the effective data rate seen by user $6$ if the two bridges are replaced with hubs ?
asked Jun 17, 2018 in Computer Networks Deepesh Pai 119 views
2 votes
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It is known that any network can only transmit data packet size equal to (or less than) MTU allowed in the network. If that is the case, and if we have a Path MTU discovery in place, why is there is need for MSS in TCP layer. Why does it ... ? Setting MSS different (read larger) than MTU, will only burden Network Layer with fragmentation overhead. Is there any significant advantage of using MSS ?
asked Feb 6, 2018 in Computer Networks Arunav Khare 505 views
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