Suppose two APs are located near each other. Which channel use strategies will result in nonoverlapping channels for Wi-F Each correct answer represents a complete solution. Choose all that apply. A B C Use 2.4-GHz channel 1 on AP-A and 5-GHz channel 48 on AP-B. 0 Use 5-GHz channel 36 on AP-A and channel 40 on AP-B. 0 Use 2.4-GHz channel 1 on AP-A and channel 2 on AP-B. 0 Use 5-GHz channel 36 on AP-A and channel 37 on AP-B.
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- We need to upgrade a channel to higher bandwidth. Answer the following questions: How is the rate improved if we double the bandwidth? How is the rate improved if we double the SNR? Show all steps.Three channels, 15-kHz, 30-kHz and 45kHz bandwidth, are to be multiplexed together. (i) If Frequency Division Multiplexer is used, recommend the minimum bandwidthof the link if there is a need for a guard band of 5 kHz between the channels.Illustrate the frequency spectrum with complete labels to rationalize yourrecommendations. (ii) If Time Division Multiplexing is used, suggest the minimum transmissionbandwidth of the link and support your answer by showing the calculationinvolved.Why CDMA can make users communicate at the same time using the same frequency band without interference? Explain the advantages and disadvantages of CDMA. Why ADSL can achieve the transmission rate of several Mbps using the bandwidth less than 1MHz? Each question is a judgment question. Write down your answer with T for True, F for False, and give the explanation if the answer is False. Consider a system of bandwidth 10Mbps, with multiple users, each is active (i.e., have data to transmit at rate 1Mbps) with a low probability, e.g. 0.1. From the capacity perspective, packet switching is better than circuit switching because the former can support more users. Denial of Service (DoS) attack can be generated by a large number of (legitimate) TCP connection requests to the same targeted server at the same time. These TCP requests can be originated from different hosts in a botnet, which is controlled by the attacker. In VSAT systems the micro-stations do not have sufficient…
- Assume that each user requires 500 kbps and is only active 25% of the time. How many users can we multiplex on an 8 Mbps link using packet switching to meet user requirements with a probability of at least 0.9? In this scenario, what is the statistical multiplexing gain?A Telecom operator has been assigned the bandwidth from 2100MHZ to 2105MHz, this can support 100 voice channels and 6 users per channel. Assume there is a guard band of 10KHz then what will be the size of a single channel? And how many total number of users could be accommodated? Draw figure on your note book along with your arid number and then add screen shot hereIn a full duplex communication by using UTP cable, Pr power is measured as 15 mw and Adb as 10,79 dB. If the received signal is correctly interpreted, which of the values are correct? a. maksimum Pc 15 mw NEXTdB : 0 ACRdB : 15,79 dB b. maksimum Pc: 5 mw NEXTdB : 10 dB ACRAB : 10,79 dB c. maksimum Pc 15 mw NEXT SB0 d8 ACRDB : 10.79 dB d. minimum Pc 12 mw NEXTdB : 7.78 dB ACCDB : 7,78 dB e minimum Pc: 5 mw NEXTdB: 10 dB ACRdB : 15,79 dB
- The minimum bandwidth of Manchester and differential Manchester is ____ that of NRZ. a. the same as b. twice c. thrice d. none of the above6. Between two hosts A and B which are connected by a link with the bandwidth 1 Mbps and with a one-way delay of 1 ms, i.e. a RTT (round-trip time) on 2 ms uses the Go-Back-N error handling mechanism. a) How large must the transmission window be if the utilization rate of the link is to be 100%, i.e. all bandwidth to use? b) What degree of utilization of the link is obtained if the transmission window is set to 125 bytes?In a simplex communication by using STP cable, which type of change can reduce the received signal quality? a. Receiver could be taken to closer b. Repeater could be used in between c. STP/FTP cable could be used instead of STP d. None e. Higher frequency of the signal could be used.
- A—XYZ Corp. is planning a new network. Engineers in the design shop must have connections to accountants and salespeople in the front office, but all routes between the two areas must traverse the shop floor, where arc welders and metal-stamping equipment create potent amounts of EMI and RFI. Given that both the design shop and front office use 10BaseT (twisted-pair Ethernet), how might you interconnect these two areas? What medium guarantees immunity from interference?Assuming that 10 sites are connected to Ethernet, find the bandwidth that each site can obtain in the following three cases 1) 10 stations connected to a 10Mbit/s Ethernet hub 2) 10 sites connected to a 100bit/s Ethernet hub 3) 10 sites connected to a 10Mbit/s Ethernet switchIn an 802.11b wireless LAN, suppose there are only two nodes, a source and a destination; the source node has a large amount of data to send to the destination node. The nodes are separated by 750 meters, and have powerful enough radios to communicate at this range. No other nodes operate in the area. Assume the following: Signal propagation speed is 3×108 meters/sec. DIFS, which is the first component of delay between noticing the medium being idle and beginning a new RTS transmission, is 50msec. The backoff time, which is the additional delay right after DIFS in case the source has additional packages to send, is chosen randomly for each packet. When there is no contention, it is uniformly likely to be anywhere from 0 to 31 slots long, where one slot is 20msec. SIFS has a value of 10msec. The frame header bits take a 200msec per packet to transmit; the Data field consists of 1100 bytes. Data is transmitted at an 11 Mbps rate. An ACK, RTS, and CTS each have a 200msec transmission…