CS601 Data Communication final term current paper fall February 2011-2012

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FINALTERM EXAMINATION

Fall 2009

CS601- Data Communication

Question No: 1 ( Marks: 1 ) - Please choose one





An unauthorized user is a network ___________ issue.



► Performance



► Reliability



► Security



► All of the given





Question No: 2 ( Marks: 1 ) - Please choose one





Which is not an element of protocol





► semantics



► timing



► communication service module





Question No: 3 ( Marks: 1 ) - Please choose one





_______ is a multipoint topology.



► Ring



► Mesh



► Tree



► Bus





Question No: 4 ( Marks: 1 ) - Please choose one





Unidirectional traffic movement is overcome by dual ring technology.



► True



► False





Question No: 5 ( Marks: 1 ) - Please choose one





Physical layer define characteristics of interface between device and _________





► transmission medium



► another device



► another peer physical layer at other side



► modem





Question No: 6 ( Marks: 1 ) - Please choose one





________ layer deals with syntax and semantics of information exchange.



► presentation



► session



► application



► physical





Question No: 7 ( Marks: 1 ) - Please choose one





To allow access to network resources is the function of ___________



► application layer



► physical layer



► network layer





Question No: 8 ( Marks: 1 ) - Please choose one





Time domain plot show changes in signal phase with respect to time.



► True



► False





Question No: 9 ( Marks: 1 ) - Please choose one





In 8QAM each signal shift or one baud represents ______.



► 4 bits



► 2 bits



► 5 bits



► 3 bits





Question No: 10 ( Marks: 1 ) - Please choose one





Modulation of an analog signal can be accomplished through changing the ___________ of the carrier signal.



► amplitude



► frequency



► phase



► all of the given





Question No: 11 ( Marks: 1 ) - Please choose one





EIA 449 provides much better functionality than EIA ________



► 232



► 223



► 262



► 222





Question No: 12 ( Marks: 1 ) - Please choose one





Which of the following is an example of ITU-T modem standards:



► T-series



► X-series



► N-series



► V-series





Question No: 13 ( Marks: 1 ) - Please choose one





Traditional modems are wide spread now to a data rate of __________.



► 56 Kbps



► 72 Kbps



► 42 Kbps



► 96 Kbps





Question No: 14 ( Marks: 1 ) - Please choose one





In case of uploading at the switching station, data is converted to digital signal using ___________.



► TCP



► PCM



► ICP



► TDM





Question No: 15 ( Marks: 1 ) - Please choose one





The RG number gives us information about ________.



► Twisted pairs



► Coaxial cables



► Optical fibers



► all of the given





Question No: 16 ( Marks: 1 ) - Please choose one





The _________ is an association that sponsors the use of infrared waves.



► IrDA



► EIA



► FCC



► PUD





Question No: 17 ( Marks: 1 ) - Please choose one





Optical fibers are defined by the ratio of the ___________ of their core to the diameter of their cladding.



► Diameter



► Radius



► Length



► Width





Question No: 18 ( Marks: 1 ) - Please choose one





The section of EM spectrum defined as Radio Communication is divided into _____ ranges called BANDS.



► 8



► 10



► 5



► 6





Question No: 19 ( Marks: 1 ) - Please choose one





Radio wave transmission utilizes ___________ different types of propagation.



► Four



► Three



► Two



► Five





Question No: 20 ( Marks: 1 ) - Please choose one





The VLF and LF bands use _________ propagation for communications.



► Ground



► Sky



► Line of sight



► Space