Description : The ______ scheme uses three levels (+V, 0, and-V) andthree transition rules to move betweenthe levels. A) 4B5B B) 2B1Q C) MLT-3 D) none of the above
Last Answer : MLT-3
Description : HDSL encodes datausing _______. A) 4B/5B B) 2B1Q C) 1B2Q D) 6B/8T
Last Answer : 2B1Q
Description : 1000Base-T uses________line coding. A) 4D-PAM5 B) 8B6T C) MLT-3 D) Manchester
Last Answer : 4D-PAM5
Description : 1000Base-SX, 1000Base-LX, and 1000Base-CX use _________ block coding and ________ line coding. A) 4B/5B; NRZ B) 8B/10B; NRZ C) 4B/5B; MLT-3 D) 8B/10B; NRZ
Last Answer : 8B/10B; NRZ
Description : 100Base-T4 uses________line coding. A) NRZ B) 8B6T C) MLT-3 D) Manchester
Last Answer : 8B6T
Description : 100Base-FX uses_________ block coding and ________ linecoding. A) 4B/5B; NRZ-I B) 8B/10B; NRZ C) 4B/5B; MLT-3 D) 8B/10B; NRZ
Last Answer : 4B/5B; NRZ-I
Description : 100Base-TX uses_________ block coding and ________ linecoding. A) 4B/5B; NRZ B) 8B/10B; NRZ C) 4B/5B; MLT-3 D) 8B/10B; NRZ
Last Answer : 4B/5B; MLT-3
Description : Ras proto-oncogene encodes (A) Epidermal growth factor (EGF) (B) Receptor for EGF (C) Signal transducer for EGF (D) Nuclear transcription factor
Last Answer : Answer : C
Description : Suppose that the one-way propagation delay for a 100 Mbps Ethernet having 48-bit jamming signal is 1.04 micro-seconds. The minimum frame size in bits is: a. 112 b. 160 c. 208 d. 256
Last Answer : d. 256
Description : Suppose the round trip propagation delay for a 10 Mbps Ethernet having 48-bit jamming signal is 46.4 ms. The minimum frame size is a. 94 b. 416 c. 464
Last Answer : c. 464
Description : The ______ technique expands the bandwidthof a signal by replacing each data bit with n bits. A) FDM B) DSSS C) FHSS D) TDM
Last Answer : DSSS
Description : The data rate is sometimes calledthe ___ rate. A) baud B) bit C) signal D) none of the above
Last Answer : bit
Description : The ________ rate defines thenumber of dataelements sent in1s; the______ rate is the numberof signalelements sent in 1s. A) data; signal B) signal; data C) baud; bit D) none of the above
Last Answer : data; signal
Description : the maximum window size for data transmission using the selective reject protocol with n-bit frame sequence numbers is: a. 2^n b. 2^(n-1) c. 2^n – 1 d. 2^(n-2)
Last Answer : b. 2^(n-1)
Description : High-level Data Link Control (HDLC) is a _______ protocol for communication over point-to-pointand multipoint links. A) bit-oriented B) byte-oriented C) character-oriented D) none of the above
Last Answer : bit-oriented
Description : Error detection ata data link level is achieved by A. bit stuffing B. cyclic redundancy codes C. Hamming codes D. equalization
Last Answer : cyclic redundancy codes
Description : A ________receivesa signal and,before it becomes too weak or corrupted, regenerates the original bit pattern. It thensends the refreshed signal. A) passive hub B) repeater C) bridge D) router
Last Answer : repeater
Description : If the baudrate fora 64-QAM signal is 2000, what is the bit rate? A) 300 B) 400 C) 1000 D) 12000
Last Answer : 12000
Description : If the bit rate for a16-QAM signal is 4000 bps, what is the baudrate? A) 300 B) 400 C) 1000 D) 1200
Last Answer : 1000
Description : If the bit rate for an FSK signal is1200 bps, thebaud rate is ________. A) 300 B) 400 C) 600 D) 1200
Last Answer : 1200
Description : f the bit rate for an ASK signal is1200 bps, thebaud rate is ________. A) 300 B) 400 C) 600 D) 1200
Description : The signal rate is sometimes called the ____ rate. A) baud B) bit C) signal D) none of the above
Last Answer : baud
Description : When propagationspeed is multiplied by propagation time, we get the ________. A) throughput B) wavelength of thesignal C) distortionfactor D) distancea signal or bit has traveled
Last Answer : distancea signal or bit has traveled
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 : Determine the maximum length of the cable (in km) for transmitting data at a rate of 500 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/s. b. 2 c. 2.5 d. 5
Last Answer : b. 2
Description : An analog signal has a bit rate of 6000 bps and a baud rate of 2000 baud. How many data elements are carried by each signal element ? (A) 0.336 bits/baud (B) 3 bits/baud (C) 120,00,000 bits/baud (D) None of the above
Last Answer : (B) 3 bits/baud
Description : A constellation diagram shows us the __________ of a signal element, particularly when we areusing twocarriers (one in-phase and one quadrature). A) amplitudeand phase B) amplitudeand frequency C) frequencyand phase D) none of the above
Last Answer : amplitudeand phase
Description : The molecule which encodes genetic information
Last Answer : Ans. DNA
Description : The transposase gene encodes an enzyme that facilitate A- viral replication within a genome B- general recombination C- site-specific integration of transposable elements D- none of the above
Last Answer : site-specific integration of transposable elements
Description : The percentage of human genome which encodes proteins is approximately a) Less than 2% b) 5% c) 25% d) 99%
Last Answer : a) Less than
Description : . In cyclic redundancy checking, the divisor is _______the CRC. A) The same size as B) one bit less than C) one bit more than D) none of the above
Last Answer : one bit more than
Description : What is the size of the ‘total length’ field in IPv4 datagram? a. 4 bit b. 8 bit c. 16 bit d. 32 bit
Last Answer : c. 16 bit
Description : What is the size of an IP address? A. 64 bit B. 128 bit C. 16 bit D. 32 bit
Last Answer : D. 32 bit
Description : Who is credited with the idea of using punch cards to control patterns in a waving machine ? Pascal Hollerith Babbage Jacquard
Last Answer : Jacquard
Description : Who is credited with the idea of using punch cards to control patterns in a waving machine? a. Pascal b. Hollerith c. Babbage d. Jacquard
Description : A byte consists of a. One bit b. Four bits c. Eight bits d. Sixteen bits
Last Answer : Eight bits
Description : Four channels are multiplexed using TDM. If each channel sends 100 bytes/second and we multiplex 1 byte per channel, then the bit rate for the link is __________. a. 400 bps b. 800 bps c. 1600 bps d. 3200 bps
Last Answer : d. 3200 bps
Description : In_______encoding, the duration of the bit is divided into twohalves. Thevoltage remains at one level during thefirst half and moves to the other level in the second half. The transition at the middle of the bit ... Manchester B) differential Manchester C) both (a) and (b) D) neither (a) nor (b)
Last Answer : both (a) and (b)
Description : In______, the changeor lackof change in the level of the voltagedetermines the value of the bit. A) NRZ-I B) NRZ-L C) both (a)and (b) D) neither (a) nor (b)
Last Answer : NRZ-I
Description : In_____, the level of the voltagedetermines the valueof the bit. A) NRZ-I B) NRZ-L C) both (a) and (b) D) neither (a) nor (b)
Last Answer : NRZ-L
Description : A ________ is a 16-bit number used by the host-to-host protocol to identify to which higher- level protocol or application program (process) it must deliver incoming messages A. connection B. UDP C. port D. TCP
Last Answer : C. port
Description : Which of the following technique isused for encapsulation? A. a technique used inbest-effort delivery systems toavoid endlessly loopingpackets. B. a technique used by protocols in which a lower level ... network that cannothandle the originaldatagram size D. All of theabove E. None of the above
Last Answer : a technique used by protocols in which a lower level protocol accepts a message from ahigher level protocol and places it in the data portion of the low level frame
Description : Which of the following technique isused for fragment? A. a technique used inbest-effort delivery systems toavoid endlessly loopingpackets B. a technique used by protocols in which a lower level protocol ... network that cannothandle the originaldatagram size D. All of theabove E. None of the above
Last Answer : one of the pieces that results when an IP gateway divides an IP datagram into smallerpieces for transmission acrossa network that cannothandle the originaldatagram size
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 : The data recording format in most of the modern magnetic tape is a. 7-bit ASCII b. 7-bit EBCDIC c. 8-bit ASCII d. 8-bit EBCDIC
Last Answer : 8-bit EBCDIC
Description : The x.25 standard specifies a a. technique for start-stop data b. technique for dial access c. DTE/DCE interface d. data bit rate e. none of above
Last Answer : DTE/DCE interface
Description : Which error detection method consists of just one redundant bit per data unit? A) Simple parity check B) Two-dimensionalparity check C) CRC D) Checksum
Last Answer : Simple parity check
Description : Bit stuffing refers to a. inserting a 0 in user stream to differentiate it with a flag b. inserting a 0 in flag stream to avoid ambiguity c. appending a nipple to the flag sequence d. appending a nipple to the use data stream
Last Answer : a. inserting a 0 in user stream to differentiate it with a flag
Description : How many 8-bit characters can be transmitted per second over a 9600 baud serial communication link using asynchronous mode of transmission with one start bit, eight data bits, two stop bits, and one parity bit ? a. 600 b. 800 c. 876 d. 1200
Last Answer : b. 800