Description : A ______is the end-to-end portion of the network between two STS multiplexers. A) section B) line C) path D) none of the above
Last Answer : path
Description : _______ allow insertion and extraction of signals. A) regenerators B) ADMs C) STS multiplexer/demultiplexers D) none of the above
Last Answer : regenerators
Description : SONET network topologies can be__________. A) linear B) ring C) mesh D) all of theabove
Last Answer : ring
Description : In SONET, STS stands for: a. Synchronous Transport Signal b. Synchronous Transport System c. Synchronous Transmission Signal d. Synchronous Transmission System
Last Answer : a. Synchronous Transport Signal
Description : A ring SONET network can be _________. A) unidirectional B) bidirectional. C) either (a) or (b) D) neither (a) nor (b)
Last Answer : bidirectional.
Description : Which of the following statement is incorrect? a. Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line b. HDLC is a standard ... indicates that it is ready to accept data d. RTS/CTS is the way the terminal indicates ringing
Last Answer : RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCW indicates that it is ready to accept data
Description : Membership in a VLAN can be based on _________. A) port numbers B) MAC addresses C) IP addresses D) all of theabove
Last Answer : all of theabove
Description : In SQL, the CREATE TABLESPACE isused A. to createa place in the databasefor storageof scheme objects, rollback segments, andnaming the data files to comprise the tablespace B. to createa database trigger C. to add/rename data files, to change storage D. All of theabove E. None of the above
Last Answer : to createa place in the databasefor storageof scheme objects, rollback segments, andnaming the data files to comprise the tablespace
Description : The simplest type of switching fabric is the ______ switch. A) crosspoint B) crossbar C) TSI D) STS
Last Answer : crossbar
Description : An STS multiplexer is a ______ device. A) one-layer B) two-layer C) three-layer D) four-layer
Last Answer : two-layer
Description : A ________ is a repeater. A) regenerator B) ADM C) STS multiplexer/demultiplexer D) none of the above
Last Answer : STS multiplexer/demultiplexer
Description : An STS-3 frameis madeof ________columns. A) 9 B) 90 C) 270 D) none of the above
Last Answer : none of the above
Description : An STS-3 frameis madeof ______ rows. A) 1 B) 9 C) 27 D) none of the above
Last Answer : 27
Description : An STS-1 frameis made______columns A) 1 B) 9 C) 90 D) none of the above
Last Answer : 90
Description : An STS-1 frameis madeof ________rows A) 1 B) 9 C) 90 D) none of the above
Last Answer : 1
Description : An ______signal is the optical modulation of an STS-n (or STM-n) signal. A) OC-n B) TDM-n C) FDM-n D) none of the above
Last Answer : TDM-n
Description : SONET is a _______ TDM system. A) asynchronous B) synchronous C) statistical D) none of the above
Description : Each ________in a SONET framecancarry a digitized voice channel. A) bit B) byte C) frame D) none of the above
Last Answer : byte
Description : In SONET, for each byte, the bitsare transmitted ____________. A) from least significant to the most significant B) from most significant tothe least significant C) two at atime D) three at atime
Last Answer : from least significant to the most significant
Description : In SONET, for each frame, the bytes are transmitted __________. A) from left to the right, top to bottom B) from right to theleft, bottom to top C) from left to the right, bottom to top D) from right to the left, top to bottom
Last Answer : from left to the right, bottom to top
Description : To make SONET backward-compatible with the current hierarchy, its framedesign includes asystem of. A) OCs B) STMs C) STSs D) VTs
Last Answer : VTs
Description : A linear SONET network can be __________. A) point-to-point B) multipoint C) either (a) or (b) D) neither (a) nor (b)
Last Answer : point-to-point
Description : In SONET each frame lasts _______ microseconds. A) 20 B) 64 C) 128 D) none of the above
Last Answer : 64
Description : SONET sends ________ frames per second A) 1000 B) 2000 C) 4000 D) 8000
Last Answer : 2000
Description : SONET defines _______ layers. A) two B) three C) four D) five
Last Answer : four
Description : ______ isa standard developed by ITU-T. A) SONET B) SDH C) either (a) or (b) D) neither (a) nor (b)
Last Answer : either (a) or (b)
Description : isa standard developed by ANSI for fiber-opticnetworks. A) SONET B) SDH C) either (a) or (b) D) neither (a) nor (b)
Last Answer : SDH
Description : . In order to use arecord management system A. You needto understand thelow-level details of how informationin stored B. You needto understand the model the record management system uses. C. Both (a)and (b) D. All of theabove E. None of the above
Last Answer : You needto understand the model the record management system uses.
Description : Queries to a database A. are written in English B. can use aggregatefunctions like SUM and COUNT C. both (a)and (b) D. All of theabove E. None of the above
Last Answer : can use aggregatefunctions like SUM and COUNT
Description : Data integrity control A. is used to set upper and lower limits on numeric data B. requires the use of passwords toprohibit unauthorized access tothe file C. has the data dictionary keep thedate and time ... back-up,and most recent modificationfor all files D. All of theabove E. None of the above
Last Answer : has the data dictionary keep thedate and time of lastaccess last back-up,and most recent modificationfor all files
Description : To connect a computer with a device inthe same room, you might be likely to use A. a coaxial cable B. a dedicated line C. a groundstation D. All of theabove
Last Answer : a coaxial cable
Description : To connect a computer with a device inthe same room, you might be likely to use A. a coaxial cable B. a dedicated line C. a groundstation D. All of theabove E. None of the above
Description : Which of the following statements is correct for the use of packet switching? A. the subdivision of information into individuallyaddressed packets in conjunction with alternativerouting arrangementenabled the transmission path ... capacity could be achieved. D. All of theabove E. None of the above
Last Answer : All of theabove
Description : If an Ethernet destination address is08:07:06:05:44:33, then this is a ______ address. A) unicast B) multicast C) broadcast D) any of theabove
Last Answer : unicast
Description : f an Ethernet destination address is07:01:02:03:04:05, then this is a ______ address. A) unicast B) multicast C) broadcast D) any of theabove
Last Answer : multicast
Description : A repeater is a connecting devicethat operates in the _______ layer of theInternet model. A) physical B) data link C) network D) all of theabove
Last Answer : physical
Description : 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
Last Answer : 7
Description : In______ schemes, the voltagesare on the both sidesof the time axis. Forexample, thevoltage level for 0 can bepositive and thevoltage level for 1 can be negative. A) polar B) bipolar C) unipolar D) all of theabove
Last Answer : polar
Description : Ina _____scheme,all the signal levels are onone sideof the time axis,either above or below. A) polar B) bipolar C) unipolar D) all of theabove
Last Answer : unipolar
Description : _________can impair a signal. A) Attenuation B) Distortion C) Noise D) All of theabove
Description : In ATM, connection between two endpoints is accomplishedthrough_______. A) TPs B) VPs C) VCs D) all of theabove
Description : ______ eliminates the varying delay times associated withdifferent-size packets. A) X.25 B) Frame Relay C) ATM D) all of theabove
Last Answer : ATM
Description : A command that lets youchange one or more fields in a record is A. Insert B. Modify C. Look-up D. All of theabove E. None of the above
Last Answer : Modify
Description : The database administration function includes A. application programming B. computer operations management C. databaseaccessplanning D. All of theabove E. None of the above
Last Answer : databaseaccessplanning
Description : Which commandis usedto selectdistinct subject (SUB) from thetable (BOOK)? A. SELECT ALL FROM BOOK B. SELECT DISTINCT SUB FROM BOOK C. SELECT SUB FROM BOOK D. All of theabove E. None of the above
Last Answer : SELECT DISTINCT SUB FROM BOOK
Description : In SQL, which commandis used to select only onecopy of each setof duplicablerows A. SELECT DISTINCT B. SELECT UNIQUE C. SELECT DIFFERENT D. All of theabove E. None of the above
Last Answer : SELECT DISTINCT
Description : A logical schema A. is the entire database B. is a standard wayof organizing information into accessible parts C. describes how data is actually stored on disk D. All of theabove E. None of the above
Last Answer : is a standard wayof organizing information into accessible parts
Description : Data encryption techniquesare particularly useful for A. reducingstorage space requirements B. improving data integrity C. protecting data indata communication systems D. All of theabove E. None of the above
Last Answer : protecting data indata communication systems
Description : Database management systems are intended to: A. eliminatedata redundancy B. establishrelationships among records in different files C. manage file access D. maintaindata integrity E. All of theabove
Description : Subschema can be used to A. create very different, personalized views of the samedata B. present information in different formats C. hide sensitive informationby omitting fields from thesub¬schema's description D. All of theabove E. None of the above