What is the OSPF cost for T-1 link (bandwidth 1.544 Mbps) given the reference bandwidth of 100 Mbps? Note 1.544 Mbps = 1.544*1000000=1,544,000 bps and 100 Mbps = 100,000,000 bps).
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What is the OSPF cost for T-1 link (bandwidth 1.544 Mbps) given the reference bandwidth of 100 Mbps? Note 1.544 Mbps = 1.544*1000000=1,544,000 bps and 100 Mbps = 100,000,000 bps).
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- Consider a CSMA/CD network that transmits data at a rate of 100 Mbps (108 bits per second) over a 1 km (kilometer) cable with no repeaters. If the minimum frame size required for this network is 1250 bytes, what is the signal speed (km/sec) in the cable?part 1: Suppose value of K is 1 (Ethernet CSMA/CD), compute backoff time when link capacity (data rate) is: 10 kbps 100 kbps part 2: Suppose a frame (F) experiences collision forth time on a shared Ethernet link of I Mbps: What is the maximum possible value of K in this case Suppose maximum value of K is taken, compute backoff bit time for frame F Convert bit time into absolute time (second or fraction of a second) part 3: Suppose two hosts (Host-A and Host-B) are connected through a shared Ethernet bus of 1 Mbps. The distance between two nodes is 5 meters. The signal propagation speed over physical media is 2.5 x 10^5 meters/second. Compute the…We have a 4 km down CSMA / CD channel with a capacity of 10 Mbps. Assume the average negotiablelength of interval is 2 ∗ ∆ and that the propagation rate is 2 ∗ 10^8 m/s, the length of frames that are transmitted is 50B. What is the efficiency of the network? The result should be rounded to 3 decimal places.
- Consider two systems are connected with LAN cable. The length of the cable is 3 kilometers and the data transmitted at a rate of 30 MB/s. The signal speed in the cable is 2.5 x 108 m/s. What is the minimum frame size in bits in the CSMA/CD network?Consider a full-duplex 512 kbps link with length 36,000Km connecting two hosts. The data frames carry a useful payload of size 6000 bits. Assume that both ACK and data frames have 400 bits of header information, and that ACK frames carry no data. The propagation speed along this link is 3×108 m/sec. a) What is the RTT on this link? b) What is the effective useful data throughput, in kbps, when using Stop-and-Wait?Problem 1. We want to design a communications link with 8 PSK waveform. The channel BW is at most 80 MHz and data rate is at least 100 Mbps. a. As far as bandwidth efficiency is concerned, would you consider 8 PSK a waveform suitable for this link?, Explain why or why not. b. What symbol period would you choose? Why? c. What is the resulting data rate? (Note, parts b and c don't have a single "correct" solution. There are many options that satisfy the problem statement, pick one and explain why.)
- Assume a 10Mbps Ethernet has two nodes, A and B, connected by a 360m cable with threerepeaters in between, and they each have one frame of 1,024 bits to send to each other. Further assumethat the signal propagation speed across the cable is 2*10^8 m/sec, CSMA/CD uses back-off intervals ofmultiples of 512 bits, and each repeater will insert a store-and-forward delay equivalent to 20-bittransmission time. At time t=0, both A and B attempt to transmit. After the first collision, A draws K = 0and B draws K = 1 in the exponential back-off protocol after sending the 48bits jam signal. a. What is the one-way propagation delay (including all repeater delays) between A and B inseconds? At what time is A's packet completely delivered at B? b. Now suppose that only A has a packet to send and that the repeaters are replaced with switches.Suppose that each switch has 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?A corporation has a medium with a 7 MHz bandwidth (lowpass). The corporation needs to create 9 separate independent channels each capable of sending at least 12 Mbps. The company has decided to use QAM technology. What is the minimum number of bits per baud for each channel? What is the number of points in the constellation diagram for each channel? Let d = 0A data channel at 5 Gbps is shared by two users. Assume that each user is transmitting at 2.5Gbps data rate continuously. Each user only transmits only 30% of the time. (a) If circuit switching is used, how many users can be supported? (b) If packet switching is used, would there be queuing delay to accommodate these two users? If a third identical user is added will there be a queuing delay? (c) What is the probability that a user is sending data? (d) Now assume three users under packet switching. Compute the probability that at any given time all three are transmitting at the same time. What is the fraction of time when the queue is growing?
- not handwritten A 3000-km long, 1 Mbps link is used to transmit 1000-bit data packets using the Selective Repeat protocol. If the speed of light in this link is 2 x 105 km/second. What is the minimum number of bits the sequence numbers should be? Assume no flow control, and negligible transmission and processing times for acknowledgments. (Take 1M = 1000,000.)3. 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)? Hint: signal propagation speed in vacuum is 3 X 108 m/sec. Compute signal propagation speed: Compute signal propagation time: Compute the length of contention slot. Proof is required. Solution:In a CSMA/CD network with a data rate of 10 Mbps, the minimum frame size is found to be 512 bits over maximum cable length 2500 m. what should be the maximum cable length if we increase the data rate to 100 Mbps?