Description : In ________,a station monitors the medium after it sends a frame to see if the transmission was successful. If so, the station is finished. If, however, there is a collision, the frameis sentagain. A) CSMA/CA B) CSMA/CD C) either (a)or (b) D) both (a) and (b)
Last Answer : CSMA/CD
Description : In_______, collisions are avoidedthrough theuse of three strategies: the interframe space, the contention window,and acknowledgments. A) CSMA/CA B) CSMA/CD C) either (a)or (b) D) both (a) and (b)
Last Answer : CSMA/CA
Description : Toavoid collisions on wireless networks, ________was invented. A) CSMA/CA B) CSMA/CD C) either (a)or (b) D) both (a) and (b)
Description : In _______, collisions are avoided through the use of three strategies: the interframe space, the contention window, and acknowledgments. A. CSMA/CA B. CSMA/CD C. either (a) or (b) D. both (a) and (b)
Last Answer : A. CSMA/CA
Description : In Ethernet CSMA/CD, the special bit sequence transmitted by media access management to handle collision is called a. Preamble b. Postamble c. Jam d. None of the above
Last Answer : c. Jam
Description : Which of the following is the multiple access protocol for channel access control? a. CSMA/CD b. CSMA/CA c. Both CSMA/CD & CSMA/CA d. HDLC
Last Answer : c. Both CSMA/CD & CSMA/CA
Description : Which of the following is the multiple access protocol for channel access control? A. CSMA/CD B. CSMA/CA C. Both CSMA/CD & CSMA/CA D. HDLC
Last Answer : C. Both CSMA/CD & CSMA/CA
Description : In IEEE 802.11, the access method used in the DCF sublayer is _________. A) ALOHA B) CSMA/CA C) CSMA/CD D) none of the above
Description : Explain CSMA/CD and CSMA/CA.
Last Answer : CSMA- resolving the media contention. Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Listen for Data Transmission on Cable (Carrier Sense) When Medium is free a) Transmit ... time, and transmit again. Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) Nov/Dec
Description : The RTS and CTS frames in CSMA/CA ____ solvethe hidden stationproblem. The RTS and CTS frames in CSMA/CA ____ solve the exposed station problem. A) can; cannot B) cannot; can C) can; can D) cannot; cannot
Last Answer : can; cannot
Description : What is CSMA/CA?
Last Answer : ∙ CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is a protocol for carrier transmission in 802.11 networks. ∙ CSMA/CA acts to prevent collisions before they happen. ∙ In CSMA/CA, as soon as a node receives a packet that is to be sent, it checks to be sure the channel is clear.
Description : The _____sublayer is responsible for the operation of the CSMA/CD access method and framing. A) LLC B) MII C) MAC D) none of the above
Last Answer : MAC
Description : The IEEE 802.3 Standard defines _________ CSMA/CD as the access method for first-generation 10-Mbps Ethernet. A) 1-persistent B) p-persistent C) non-persistent D) none of the above
Last Answer : 1-persistent
Description : The minimum frame size required for a CSMA/CD based computer network running at 1 Gbps on a 200m cable with a link speed of 2 × 108m/s is a. 125 bytes b. 250 bytes c. 500 bytes d. None of these
Last Answer : b. 250 bytes
Description : Which of the following statements is TRUE about CSMA/CD a. IEEE 802.11 wireless LAN runs CSMA/CD protocol b. Ethernet is not based on CSMA/CD protocol c. CSMA/CD is not suitable for a high propagation delay network like satellite network d. There is no contention in a CSMA/CD network
Last Answer : CSMA/CD is not suitable for a high propagation delay
Description : Consider a CSMA/CD network that transmits data at a rate of 100 Mbps (108 bits per second) over a 1 km (kilometre) 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? a. 8000 b. 10000 c. 16000 d. 20000
Last Answer : d. 20000
Description : What is CSMA/CD?
Last Answer : Carrier Sense Multiple Access with Collision Detection (CSMA/CD) When a station has a frame to transmit: 1) Listen for Data Transmission on Cable (Carrier Sense) 2) When Medium is Quiet (no ... for Collision. b) If collision is heard, stop transmitting, wait random time, and transmit again.
Description : Explain the terms topology and access methods used in LANs. Discuss the CSMA/CD and CSMA/CA protocols.
Last Answer : (i) LAN topologies: Network topology is a physical schematic which shows interconnection of the many users. There are four basic topologies as under: (a) Direct Connection or one to all ... it is free, the station transmits, and waits for an acknowledgment signal that the packet was received
Description : LAN? a) CDMA b) CSMA/CA c) ALOHA d) CSMA/CD
Last Answer : b) CSMA/CA
Description : ________ requires that each station first listento the medium before sending. A) MA B) CSMA C) FDMA D) CDMA
Last Answer : CSMA
Description : In ______, the chanceof collisioncan be reduced if a station senses the medium beforetrying touse it. A) MA B) CSMA C) FDMA D) CDMA
Description : The vulnerable timefor CSMA is the ________propagationtime. A) the sameas B) two times C) three times D) none of the above
Last Answer : the sameas
Description : Which multiple access technique is used by IEEE 802.11 standard for wireless LAN? a. ALOHA b. CSMA/CA c. CDMA d. none of the mentioned
Last Answer : b. CSMA/CA
Description : Transmission system for a multidrop network A. Taken passing B. Polling C. Switching D. CSMA/CD
Last Answer : B. Polling
Description : Ethernet is baseband system using CSMA/CD operating at A. 20 Mbps B. 10 Mbps C. 30 Mbps D. 40 Mbps
Last Answer : B. 10 Mbps
Description : The reason a CSMA/CD network has a minimum length for packets is:
Last Answer : to make sure all other nodes hear a collision in progress
Description : Which IEEE standard is developed for CSMA/CD a. IEEE 802.1 b. IEEE 802.2 c. IEEE 802.3 d. IEEE 802.4
Last Answer : c. IEEE 802.3
Description : In IEEE 802.11, the ______ is a timerused for collision avoidance. A) NAV B) BSS C) ESS D) none of the above
Last Answer : NAV
Description : Which of the following condition is usedto transmit two packets overa medium at the same time? A. Contention B. Collision C. Synchronous D. Asynchronous E. None of the above
Last Answer : Collision
Description : In an Ethernet local area network, which one of the following statements is TRUE ? a. A station stops to sense the channel once it starts transmitting a frame. b. The purpose ... collision is detected. d. The exponential backoff mechanism reduces the probability of collision on retransmissions
Last Answer : The exponential backoff mechanism reduces the probability of collision on retransmissions
Description : . If there is only one station with a packet to send, this guarantees that there will ………….. For that packet. A. never be a collision B. be a collision C. be an improvement D. direction
Last Answer : A. never be a collision
Description : Which of the following statements accurately describe the differences between a hub and a switch? Check all that apply. A. A switch remembers which devices are connected on each interface, while a hub does not. B. A hub is a ... versions of switches. a. A,B b. A,B,C c. A,B,C,D d. A,C,D
Last Answer : b. A,B,C
Description : ______ is a static algorithm in which every incoming packet is sent out on every outgoing line except the one it arrives on. This method usually generates vast number of duplicate packets.. A. Flooding B. Wait and watch C. congestion D. both a and c
Last Answer : A. Flooding
Description : Which one of the following statements is incorrect? (A) Insulin increases glucose phosphorylation (B) Insulin increases glycolysis (C) Insulin augments HMP shunt (D) Insulin promotes gluconeogenesis
Last Answer : Answer : D
Description : Which of the following statement(s) is/are true concerning the neuroendocrine responses to shock? a. Sympathetic nerve endings release epinephrine which is responsible for greater than 80% ... injury and sepsis d. The renin-angiotensin axis further augments the sympathetic-mediated vasoconstriction
Last Answer : Answer: c, d The neuroendocrine response to shock attempts to achieve restoration of effective blood volume, mobilization of metabolic substrates, and maintenance of central ... . Angiotensin II is an extremely effective vasoconstrictor that further augments sympathetic-mediated vasoconstriction
Description : The following are true about chemicals involved in allergic reaction: a. thromboxane -leukocyte activation b. prostaglandin-2 - vasodilatation c. platelet-activating factor - leukocyte activation d. heparin - augments inactivation of prostaglandins
Last Answer : prostaglandin-2 - vasodilatation
Description : A yaw damper: a. Increases rudder effectiveness b. Must be disengaged before making a turn c. Augments stability d. Increases the rate of yaw
Last Answer : c. Augments stability
Description : Acidic urine augments the antibacterial action of the following drug: A. Ciprofloxacin B. Cotrimoxazole C. Gentamicin D. Nitrofurantoin
Last Answer : D. Nitrofurantoin
Description : The _________ routing uses the Dijkstra algorithm to build aroutingtable. A) distancevector B) link state C) path vector D) none of the above
Last Answer : link state
Description : If delaysare recorded as 10 bit numbers in a 50 router network, and delay vectorsare exchanged twicea second,how muchbandwidth per fill duplex line is occupied by the distributedrouting algorithm? A. 500 bps B. 1500 bps C. 5 bps D. 1000 bps
Last Answer : 1000 bps
Description : A station in a network forwards incoming packets byplacing them on its shortest output queue. Whatrouting algorithm is being used? A. hot potatorouting B. flooding C. static routing D. delta routing E. None of the above
Last Answer : hot potatorouting
Description : Which algorithm is used to shape the bursty traffic into a fixed rate traffic by averaging the data rate? a. solid bucket algorithm b. spanning tree algorithm c. hocken helm algorithm d. leaky bucket algorithm
Last Answer : d. leaky bucket algorithm
Description : In the slow start phase of the TCP congestion control algorithm, the size of the congestion window a. does not increase b. increases linearly c. increases quadratically d. increases exponentially
Last Answer : d. increases exponentially
Description : Consider an instance of TCP's Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of the slow start phase is 2 MSS and the threshold at the start of the first transmission is ... the end of the tenth transmission. a. 8 MSS b. 14 MSS c. 7 MSS d. 12 MSS
Last Answer : c. 7 MSS
Description : Which of the following is not a congestion policy at network layer? a. Flow Control Policy b. Packet Discard Policy c. Packet Lifetime Management Policy d. Routing Algorithm
Last Answer : a. Flow Control Policy
Description : Which one of the following algorithm is not used for congestion control? a. traffic aware routing b. admission control c. load shedding d. routing information protocol
Last Answer : d. routing information protocol
Description : Which of the following routing algorithms can be used for network layer design? a. shortest path algorithm b. distance vector routing c. link state routing d. all of the mentioned
Last Answer : d. all of the mentioned
Description : Distance Vector Routing is a……... routing algorithm, it consists of a data structure called a ……… A. Static , routing table B. Dynamic, look-up table C. Dynamic, routing table D. Static, look-up table
Last Answer : C. Dynamic, routing table
Description : Flooding is also a……... algorithm, usually generates ………... of duplicate packets. A. Static, vast number B. dynamic , vast number C. Static, less number D. dynamic , less number
Last Answer : A. Static, vast number
Description : In the ________ algorithm of TCP, the size of the congestion window increases exponentially until it reaches a threshold A. slow-start B. congestion avoidance C. congestion detection D. none of the above
Last Answer : A. slow-start