In _______ methods,a stationcannot send unless it hasbeen authorized byother stations. A) random access B) controlledaccess C) channelization D) none of the above

In _______ methods,a stationcannot send unless it hasbeen authorized byother stations.
A)
random access
B)
controlledaccess
C)
channelization
D)
none of the above
by

1 Answer

Answer :

controlledaccess
by

Related questions

In _______ methods, the stations consult one another tofind which station has the right to send. A) random access B) controlledaccess C) channelization D) none of the above

Description : In _______ methods, the stations consult one another tofind which station has the right to send. A) random access B) controlledaccess C) channelization D) none of the above

Last Answer : controlledaccess

________is a multiple-access method in which the available bandwidthof a link is shared in time, frequency, or through code, between different stations. A) Random access B) Controlledaccess C) Channelization D) none of the above

Description : ________is a multiple-access method in which the available bandwidthof a link is shared in time, frequency, or through code, between different stations. A) Random access B) Controlledaccess C) Channelization D) none of the above

Last Answer : Channelization

In ___________ methods, no station is superior to another station and none is assigned the controlover another. A) random access B) controlledaccess C) channelization D) none of the above

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Last Answer : random access

There are two cliffs. They are each attached by a suspension bridge that takes 5 minutes to walk across, and is the only way to get to the other side. No one is allowed to cross the bridge unless authorized. There is a guard on the other side that takes a nap every 5 minutes, then keeps watch for 5 minutes, takes a nap for 5 minutes, and so on. Let's say you don't have authorization. How would you get across (Remember, he wakes up EXACTLY after 5 minutes, meaning if you go on the bridge the second he takes a nap, and you cross the bridge, he'll wake up exactly when you reach the other side, and send you back)? -Riddles

Description : There are two cliffs. They are each attached by a suspension bridge that takes 5 minutes to walk across, and is the only way to get to the other side. No one is allowed to cross the bridge unless ... the bridge, he'll wake up exactly when you reach the other side, and send you back)? -Riddles

Last Answer : You can't go as he is awake, he'll see you, but go when he doesn't see you. Then, turn back as he is waking up, pretending to go to the side you came from. Then, he'll figure you are unauthorized to set foot on the bridge, and send you to the side you want to get to.

The two basic types of record-access methods are a. Sequential and random b. Sequential and indexed c. Direct and immediate d. On-line and real time

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Last Answer : Sequential and random

Gigabit Ethernet access methods include _______ mode. A) half-duplex B) full-duplex C) both (a) and (b) D) neither (a) nor (b)

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Last Answer : both (a) and (b)

The term 'duplex' refers to theability of the data receiving stations toecho back aconfirming messageto the sender. Infull duplex data transmission, both the sender and the receiver A. cannot talk at once B. can receive and send datasimultaneously C. can sendor receive data one ata time D. can do one way data transmission only E. None of the above

Description : The term 'duplex' refers to theability of the data receiving stations toecho back aconfirming messageto the sender. Infull duplex data transmission, both the sender and the receiver A. cannot talk at once B. can ... data one ata time D. can do one way data transmission only E. None of the above

Last Answer : can do one way data transmission only

In IEEE 802.11, a___ is made of stationary or mobile wireless stations and anoptional central base station, known as the access point (AP). A) ESS B) BSS C) CSS D) none of the above

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In astar-topology Ethernet LAN, _______ is just a point where the signals coming from different stations collide; it is thecollision point. A) An activehub B) A passivehub C) either (a)or (b) D) neither (a) nor (b)

Description : In astar-topology Ethernet LAN, _______ is just a point where the signals coming from different stations collide; it is thecollision point. A) An activehub B) A passivehub C) either (a)or (b) D) neither (a) nor (b)

Last Answer : A passivehub

_______ is designed to be usedin wirelessapplications in which stations must be ableto sharethe medium without interception by an eavesdropperand without beingsubject tojamming from a malicious intruder. A) Spread spectrum B) Multiplexing C) Modulation D) None of the above

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A storage device whe3re the access time is depended upon the location of the data is a. Random access b. Serial access c. Sequential access d. Transaction access

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Which of the following is a way to access secondary memory? a. Random access memory b. Action method c. Transfer method d. Density method

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Which of the following is designated as the international distress, safety and calling frequency for radio telephony for stations of the maritime mobile service when using frequencies in the authorized bands between 156 and 174 MHz? A. 165.8 MHz B. 156.8 MHz C. 158.6 MHz D. 168.5 MHz

Description : Which of the following is designated as the international distress, safety and calling frequency for radio telephony for stations of the maritime mobile service when using frequencies in the authorized bands between 156 and 174 MHz? A. 165.8 MHz B. 156.8 MHz C. 158.6 MHz D. 168.5 MHz

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We discussed ______ popular controlled-access methods. A) two B) threeC)fourD)none of the above

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Last Answer : three

In Go-Back-N ARQ, if frames 4,5, and 6 are received successfully, thereceiver may send an ACK _______ to thesender. A) 5 B) 6 C) 7 D) any of theabove

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_______ control refers to aset of proceduresused torestrict the amount ofdata that the sender can send before waiting foracknowledgment. A) Flow B) Error C) Transmission D) none of the above

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The two basic types of record access methods are: A) Sequential and random B) Sequential and indexed C) Direct and immediate D) Online and real time

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The two basic types of record-access methods are a. Sequential and random b. Sequential and indexed c. Direct and immediate d. On-line and real time

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We have categorizedaccess methods into _______ groups. A) two B) three C) four D) five

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Storage device where time to retrieve stored information is independent of address where it is stored is called _______ A. Random Access Memory B. Secondary Memory C. System D. None of the above

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. In IEEE 802.11, communication between two stations in twodifferent BSSs usually occurs viatwo ________. A) BSSs B) ESSs C) APs D) none of the above

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A ________is a device in which the stations are completely unaware of its existence. A) passive hub B) repeater C) simple bridge D) transparent bridge

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________ is actually a multiport repeater. It is normally usedto createconnections between stations in a physical star topology. A) An activehub B) A passivehub C) either (a)or (b) D) neither (a) nor (b)

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Last Answer : An activehub

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Contention is A. One or more conductors that serve as a common connection for a related group of devices B. a continuous frequency capableof being modulated or impressed witha second signal C. the condition whentwo or more stations attempt to use the same channel at the same time D. a collection of interconnected functional units that provides a data communications service among stations attached tothe network E. None of the above

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Description : A pure ALOHA Network transmits 200 bit frames using a shared channel with 200 Kbps bandwidth. If the system (all stations put together) produces 500 frames per second, then the throughput of the system is ______. a. 0.384 b. 0.184 c. 0.286 d. 0.58

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The distance between two stations M and N is L kilometers. All frames are K bits long. The propagation delay per kilometer is t seconds. Let R bits/second be the channelcapacity. Assuming that processing delay is negligible, the minimum number of bits for the sequence number field in a frame for maximum utilization, when the sliding window protocol used is: a. A b. B c. C d. D

Description : The distance between two stations M and N is L kilometers. All frames are K bits long. The propagation delay per kilometer is t seconds. Let R bits/second be the channel capacity. Assuming that processing ... maximum utilization, when the sliding window protocol used is: a. A b. B c. C d. D

Last Answer : c. C

State weather the following statement is true or false for Token Bus 1).It is a linear or tree- shaped cable onto which the stations are attached. 2). the token propagates around the logical ring, with only the token holder being permitted to transmit frames 3). In this token bus arrangement The physical order in which the stations are connected to the cable is very important. A. 1. False, 2. true, 3. true B. 1. true, 2. false, 3. false C. 1. false, 2. false, 3. false D. 1. true, 2. true, 3. false

Description : State weather the following statement is true or false for Token Bus 1).It is a linear or tree- shaped cable onto which the stations are attached. 2). the token propagates around the logical ring, with only the token holder ... 3. false C. 1. false, 2. false, 3. false D. 1. true, 2. true, 3. false

Last Answer : D. 1. true, 2. true, 3. false

With Slotted Aloha, a …………. sends out small clock tick packets to the outlying stations. A. distributed clock B. synchronized clock C. centralized clock D. Digital clock

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Last Answer : C. centralized clock

No appeal against such alternative will lie to a higher authority unless it is submitted within the usual time limit of _______ from the date of communication a) Three months b) Six month c) One year d) One month

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The two kinds of main memory are: a. Primary and secondary b. Random and sequential c. ROM and RAM d. All of above

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Inthe _______method, after thestation finds the line idle it sends or refrainfrom sending based on the outcome ofa random number generator. If the line is busy, it tries againA)nonpersistentB)1-persistentC)p-persistentD)none of the above

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Last Answer : p-persistent

Inthe ________method, a stationthat has a frame tosend senses the line. If the line is idle, it sends immediately. If theline is not idle, it waits a random amount of time and then senses the line again. A) nonpersistent B) 1-persistent C) p-persistent D) none of the above

Description : Inthe ________method, a stationthat has a frame tosend senses the line. If the line is idle, it sends immediately. If theline is not idle, it waits a random amount of time and then senses the line again. A) nonpersistent B) 1-persistent C) p-persistent D) none of the above

Last Answer : nonpersistent

When 2 or more bits in a data unit has been changed during the transmission, the error is called _____ a. random error b. burst error c. inverted error d. double error

Description : When 2 or more bits in a data unit has been changed during the transmission, the error is called _____ a. random error b. burst error c. inverted error d. double error

Last Answer : b. burst error

When 2 or more bits in a data unit has been changed during the transmission, the error is called ____________ A. random error B. burst error C. inverted error D. double error

Description : When 2 or more bits in a data unit has been changed during the transmission, the error is called ____________ A. random error B. burst error C. inverted error D. double error

Last Answer : B. burst error