pdfs

vineeth/Feb11.csv

+Question,Type,Answer,Marks,Category,Opt1,Opt2,Opt3,Opt4,Opt5,Remarks
+Which of the following is true of CSMA protocols? Select all that apply.,MULTIPLE_CHOICE,[ [ 1, 3 ] ],1,,In 1-persistent CSMA-if channle is idle-you backoff for some time,Ethernet employs 1-persistent protocol,1-persistent protocol is worse than slotted aloha,In non-persistent-if channel busy- you wait a random amount of time and try again,,
+Which of the following is true of CSMA protocols? Select all that apply.,MULTIPLE_CHOICE,[ [ 0, 1 ] ],1,,Non-persistent protocols suffers from longer delays,In p-persistent if channel is idle, you transmit with prob p,non-persistent assumes a slotted system,Wi-Fi uses a non-persistent CSMA,,
+Which among the following performs best at high loads?,SINGLE_CORRECT_ANSWER,[ 3 ],1,,slotted aloha,1-p,0.5-p,non-p,,
+Which of the following is true of CSMA/CD? Select all that apply.,MULTIPLE_CHOICE,[ [ 2 ] ],1,,Worst case delay for detecting collisions is 2RTT,As propagation approaches 0- efficiency approaches 0,Minimum frame size in ethernet is 64 bytes,Exponential backoff ensures fairness among nodes,,
+which if the following is true of WiFi technology? Select all that apply.,MULTIPLE_CHOICE,[ [ 2 ] ],1,,In infrastructure mode-stations communicate with each other directly,DCF is polling based,Beacons carry SSID information,Passive scanning employs probe request and response,,
+which if the following is true of WiFi technology? Select all that apply.,MULTIPLE_CHOICE,[ [ 0, 3 ] ],1,,Active scanning results in faster association than passive scanning,A client can authenticate with only one AP,Beacon frames are carried in control frames,Bits in frame control field indicate the type of frame,,
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vineeth/Feb14.csv

+Question,Type,Answer,Marks,Category,Opt1,Opt2,Opt3,Opt4,Opt5,Remarks
+Which of the following is true of CSMA protocols? Select all that apply.,MULTIPLE_CHOICE,[ [ 2 ] ],1,,If a node has a frame to send, it just sends,1-persistent protocol is worse than pure aloha,802.15.4 (zigbee) uses non-persistent CSMA,In p-persistent-if channel is idle-you wait a random amount of time and try again,,
+Which of the following is true of CSMA protocols? Select all that apply.,MULTIPLE_CHOICE,[ [ 0, 1 ] ],1,,In non-persistent, if channel busy, you wait a random amount of time and try again,In p-persistent, if channel is busy, you wait till idle,non-persistent assumes a slotted system,Ethernet uses non-persistent CSMA,,
+Which of the following is true of CSMA/CD? Select all that apply.,MULTIPLE_CHOICE,[ [ 0, 2 ] ],,CD helps reduce wastage of resources,Propagation delay has no effect on efficiency,Worst case delay for detecting collisions is 1RTT,Minimum frame size in ethernet is 16 bytes,,
+Which of the following is true of CSMA/CD? Select all that apply.,MULTIPLE_CHOICE,[ [ 0 ] ],1,,Exponential backoff ensures adaptation to current load,Bit time is 512 so as to ensure fairness among the nodes,Longer the propagation delay, lower chances of collision,Efficiency is a function of only transmisison time,,
+which if the following is true of WiFi technology? Select all that apply.,MULTIPLE_CHOICE,[ [ 0, 1 ] ],1,,PCF is polling based,In independent mode, stations communicate with each other directly,Active scanning relies on beacons,Data frames carry SSID information,,
+which if the following is true of WiFi technology? Select all that apply.,MULTIPLE_CHOICE,[ [ 0, 3 ] ],1,,A client can associate with only one AP,Data transfer can begin right after authentication,ACK is a management frame,The purpose of scanning is to select the "best" AP,,
+ 
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vineeth/Feb7.csv

+Question,Type,Answer,Marks,Category,Opt1,Opt2,Opt3,Opt4,Opt5,Remarks
+Hub provides what topolgy?,SINGLE_CORRECT_ANSWER,[ 0 ],1,easy,Star,Ring,Bus,Mesh,,
+Unicast means,SINGLE_CORRECT_ANSWER,[ 0 ],1,,packet intended for a specific node,packet intended for all nodes,packet intended for a subset of nodes,packet intended for no node,,
+In a random access protocol involving N users using a channel with rate R, if only
+one user is active, what max throughput can he achieve?,SINGLE_CORRECT_ANSWER,[ 0 ],1,,R,R/N,N/R,N*R,,
+In the speed dating analogy-CDMA translates to?,SINGLE_CORRECT_ANSWER,[ 2 ],1,,Allocate couples different time slots,Allocate couples different spaces,Ask couples to talk in different languages,Ask couples to raise their hands,,
+Which of the following are true of channel partitioning protocols? Select all that apply/,MULTIPLE_CHOICE,[ [ 3 ] ],1,,In TDM- sender can get R rate (= channel rate) when there are N users,An advantage of FDM is there is no sender-receiver channel coordination
+,In CDMA-sender can get R rate (= channel rate) when there are N users,There is no channel access delay in FDM,,
+Which of the following is true of taking turns protocols? Select all that apply.,MULTIPLE_CHOICE,[ [ 3, 2 ] ],1,,In polling protocols, a single user will get rate equal to R (=channel rate),Token passing protocols do not suffer from single point of failure,Polling protocols suffer from single point of failure,Taking turn protocols perform better than random access protocols at high loads,,
+What is the efficieny of slotted Aloha in percentage? Format X (e.g. 30),FLOAT_TYPE,[ { "max_val": "37", "min_val": "36" } ],1,,,,,,,
+Which of the following is true of Aloha based protocols? Select all that apply,MULTIPLE_CHOICE,[ [ 0, 2 ] ],1,,There is channel access delay in slotted aloha,On collision, sender immediately transmits,As the traffic load increases, the throughput rises and falls,The vulnerable period in slotted aloha is twice pure aloha,,
+Which among the following is True about a HUB? Select all that apply,MULTIPLE_CHOICE,[ [ 0, 3 ] ],1,,Hub is a physical layer device,Hub buffers frames,Hub implements a MAC protocol,Cannot connect 10BaseT with 100BaseT via hub,,
+Which of the following is true of Ethernet? Select all that apply,MULTIPLE_CHOICE,[ [ 1, 2 ] ],1,,Ethernet is connection -oriented protocol,Employs manchester enoding,Half duplex mode requires a MAC,Ethernet employs 2D parity for Error detection,,
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