Description : A synchronous transmission usually begins with which character
Last Answer : SYN
Description : A synchronous transmission usually begins with which character?
Description : Synchronous transmission is used because:
Last Answer : no start and stop bits means higher efficiency
Description : A transmission of binary data which involves the transmission of two non – zero voltage level
Last Answer : Bipolar
Description : Data rate at which serial PCM bits are clocked out of the PCM encoder onto the transmission line.
Last Answer : line speed
Description : Category of data transmission if the binary pulse is maintained for the entire bit time?
Last Answer : Return to zero
Description : An FDM hierarchy which is formed by frequency – division multiplexing 10 super groups together for a combined capacity of 600 voice band message channels.
Last Answer : Mastergroup
Description : It is used to encode the minimum amount of speech information necessary to reproduce a perceptible message with a fewer bits that those needed by a conventional encoder/decoder
Last Answer : vocoders
Description : Packets which is self – contained and travels through the network independent of other packets of the same message by whatever means available
Last Answer : Datagram
Description : A(n) ________function creates a message digest out of a message.
Last Answer : hash
Description : Message _______ means that the receiver is ensured that the message is coming from the intended sender, not an imposter
Last Answer : authentication
Description : A special type of transmission line that consist of conducting metallic tube through which high frequency electromagnetic energy is propagated
Last Answer : waveguide
Description : The point on the antenna where the transmission line is connected is called _____
Last Answer : feedpoint
Description : It involves converting standard logic levels to a form more suitable to telephone transmission lines
Last Answer : igital line encoding
Description : It is the transmission of information in any form from one source to one or more destination.
Last Answer : Multiplexing
Description : It is the ratio of the transmission bit rate to the minimum bandwidth required for a particular modulation scheme
Last Answer : Bandwidth efficiency, Information density, or Spectral efficiency
Description : For the 16-PSK and a transmission system with a 10kHz bandwidth, determine the maximum bit rate
Last Answer : 40,000 bps
Description : Rate of change of a signal on a transmission medium after encoding and modulation have occurred
Last Answer : baud rate
Description : Ethernet is baseband transmission system designed by _____
Last Answer : Robert Metcalfe and David Boggs
Description : They experimented with light transmission cables through bundle of fibers and lead to the development of flexible fiberscope
Last Answer : Van Heel, Hopkins and Kapany
Description : __________ defines how a user gets control of the channel so as to allow transmission.
Last Answer : channel access
Description : Used for transmission of PCM encoded time – division multiplexed digital signal.
Last Answer : T carriers
Description : does its best to get a transmission through to its destination, but with no guarantees
Last Answer : best-effort delivery
Description : It is logically equivalent to making telephone call through the DDD network except no direct end-to-end connection is made
Last Answer : Virtual call
Last Answer : 80-132.
Description : What is framing? A. Is concerned of synchronous system B. Refers to parallel transmission C. Is concerned with the boundaries between characters D. Is concerned with individual bits
Last Answer : C. Is concerned with the boundaries between characters
Description : The several types of white blood cells are sometime collectively referred to as: a) erythrocytes (pron: eh-rith-row-cites) b) leukocytes (pron: lew-kah-cites) c) erythroblasts (pron: eh-rith-rah-blast) d) thrombocytes (pron: throm-bow-cites)
Last Answer : ANSWER: B -- leukocytes
Description : In __________ transmission, a unique SYNC character is transmitted at the beginning of each message. A. asynchronous B. synchronous C. digital D. analogue
Last Answer : B. synchronous
Description : ____ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer.
Last Answer : UDP
Description : _______ refers to the structure or format of the data, meaning the order in which they are presented.
Last Answer : Semantics
Description : A ________ is a set of rules that governs data communication
Last Answer : protocol
Description : Sixteen different levels (symbols) are used to encode binary data. The channel bandwidth is 36 MHz. The maximum channel capacity is
Last Answer : 288 Mbps
Description : It is proposed network designed by major telephone companies in conjunction with the ITU-T with the intent of providing worldwide telecommunications support for voice, data, video and facsimile information within the same networ
Last Answer : ISDN
Description : It is how the primary designates the secondary as the designation of recipient of data
Last Answer : Selection
Description : Variation of biphase that is used for encoding SMPTE time code data and for recording on video tapes
Last Answer : Biphase – M
Description : Set rules implementing and governing an orderly exchange of data between layers of two devices, such as line control units and front – end processors.
Last Answer : Data Link Protocol
Description : A modulation technique where data rates in excess of 56 kbps can be achieved over telephone circuits
Last Answer : Trellis Code Modulation
Description : Classification of protocol that interprets a frame of data as a group of successive bit combined into predetermined pattern of fixed length, usually 8 bits each.
Last Answer : Character and Byte-oriented protocols
Description : Dividing the data block by a constant produces a remainder that is used for error detection.
Last Answer : Cyclic redundancy check
Description : A _______ is a connecting device that operates in the physical and data link layers of the Internet model.
Last Answer : bridge
Description : IEEE has defined the specifications for a wireless LAN, called _______, which covers the physical and data link layers.
Last Answer : . IEEE 802.11
Description : In the ________ traffic model, the rate of the data flow changes in time, with the changes smooth instead of sudden and sharp.
Last Answer : variable bit rate
Description : In IPv4, what is the value of the total length field in bytes if the header is 28 bytes and the data field is 400 bytes?
Last Answer : 428
Description : The ________ is a function of three values: average data rate, peak data rate, and maximum burst size.
Last Answer : Effective bandwidth
Description : Modem is referred to as ______. A. Universal asynchronous Rx/Tx B. Data communication equipment C. Universal synchronous Rx/Tx D. Data terminal equipment
Last Answer : B. Data communication equipment
Description : At what frequency compared to the cutoff frequency of a waveguide will the wavefronts be reflected back and forth across the guide (setting up standing waves) and no energy
Last Answer : UHF receiving antenna
Description : The magnetic field of an antenna is perpendicular to the earth. The antenna’s polarization ___
Last Answer : is horizontal
Description : It is the ratio of the power density radiated in a particular direction to the power density radiated to the same point by a reference antenna, assuming both antennas are radiating the same amount of power
Last Answer : directive gain
Description : The property of interchangeability for the transmitting and receiving operations is known as ____
Last Answer : reciprocity
Description : The fields surrounding the antenna do not collapse their energy back into the antenna but rather radiate it out in space
Last Answer : radiation field