Data Communication Systems
Review Questions
Course Introduction
Data Communication Systems explores the fundamental concepts and technologies involved in the reliable exchange of data between devices and networks. The course covers key topics such as signal transmission, data encoding, error detection and correction, communication protocols, network architecture, and data link controls. Students will gain an understanding of both wired and wireless systems, the OSI and TCP/IP models, and practical applications in modern networking environments. Emphasis is placed on how data is transmitted efficiently and securely across various types of communication channels, preparing students for further study or careers in networking, telecommunication, and information systems.
Recommended Textbook
Data and Computer Communications 10th Edition by William Stallings
Available Study Resources on Quizplus
24 Chapters
1079 Verified Questions
1079 Flashcards
Source URL: https://quizplus.com/study-set/3953 Page 2
Chapter 1: Data Communications, data Networks,
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78892
Sample Questions
Q1) Convergence refers to the merger of previously distinct telephony and information technologies and markets.
A)True
B)False
Answer: True
Q2) Networks that generally cover a large geographical area,require the crossing of public right-of-ways,consist of a number of interconnected switching nodes, and rely on circuits provided by a common carrier are ________.
Answer: Wide Area Networks (WANs)
Q3) The key elements of a simple communications model are ________.
A)source,transmission,destination
B)signal,transmission,receiver
C)source,signal,destination
D)source,signal,receiver
Answer: A
Q4) There is a potential for error in all communication systems,therefore,_________ and correction are required in circumstances where errors cannot be tolerated.
Answer: error detection
To view all questions and flashcards with answers, click on the resource link above.
3
Chapter 2: Protocol Architecture, tcpip, and
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78891
Sample Questions
Q1) Electronic mail,remote logon,network management and Web access are examples of ________ applications.
A)elastic
B)real-time
C)file transfer
D)transport
Answer: A
Q2) The primary function of a gateway is to relay data from one network to the other on its route from the source to the destination end system.
A)True
B)False
Answer: False
Q3) The two commonly used transport level protocols used as part of the TCP/IP protocol suite are TCP and ________.
Answer: User Datagram Protocol (UDP)
Q4) The services between adjacent layers in a protocol architecture are expressed in terms of ________ and parameters.
Answer: primitives
To view all questions and flashcards with answers, click on the resource link above. Page 4
Chapter 3: Data Transmission
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78890
Sample Questions
Q1) A guided transmission medium is ________ if it provides a direct link between two devices and those are the only two devices sharing the medium.
A)multipoint
B)simplex
C)point-to-point
D)wireless
Answer: C
Q2) In full-duplex operation both stations may transmit,but only one at a time.
A)True
B)False
Answer: False
Q3) For any given medium,the greater the bandwidth transmitted,the greater the cost.
A)True
B)False
Answer: True
Q4) A technique known as ________ is used to provide a flicker free image without increasing the bandwidth requirement.
Answer: interlacing
To view all questions and flashcards with answers, click on the resource link above. Page 5
Chapter 4: Transmission Media
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78889
Sample Questions
Q1) The characteristics and quality of a data transmission are determined both by the characteristics of the medium and the characteristics of the signal.
A)True
B)False
Q2) The parabolic reflective antenna is a type of antenna used in terrestrial microwave and satellite applications.
A)True
B)False
Q3) Used for amateur radio,CB radio,and international broadcasts such as BBC and Voice of America,________ propagation is a signal from an earth based antenna reflected from the ionosphere back down to earth.
Q4) Coaxial cable is used to transmit both analog and digital signals.
A)True
B)False
Q5) Wireless transmission frequencies in the range of about 1 GHz to 40 GHz are referred to as ________ frequencies.Highly directional beams are possible at these frequencies.
Q6) A thin,flexible medium capable of guiding an optical ray is an ________.
To view all questions and flashcards with answers, click on the resource link above. Page 6
Chapter 5: Signal Encoding Techniques
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78888
Sample Questions
Q1) A distinction needs to be made between data rate (expressed in bits per second)and ________ rate (expressed in baud)when signal encoding techniques are used.
Q2) In ________ signaling one logic state is represented by a positive voltage level and the other by a negative voltage level.
Q3) In ________ the phase of the carrier signal is shifted to represent data.
A)MFSK
B)ASK
C)FSK
D)PSK
Q4) Amplitude shift keying is less susceptible to error than binary frequency shift keying.
A)True
B)False
Q5) The most familiar use of transmitting digital data using analog signals is the public telephone network.
A)True
B)False
Q6) The process of converting analog data into digital data is known as ________.
Q7) NRZI is an example of ________ encoding.
To view all questions and flashcards with answers, click on the resource link above. Page 7
Chapter 6: Error Detection and Correction
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78887
Sample Questions
Q1) The ratio of redundant bits to data bits,(n - k)/k ,is called the __________ of the code.
A)redundancy
B)coding gain
C)code rate
D)fixed parity
Q2) The ________ is a measure of how much additional bandwidth is required to carry data at the same data rate as without the code.
Q3) In ________ transmission systems,an error occurs when a bit is altered between transmission and reception.
A)analog
B)digital
C)idle
D)guided
Q4) Redundant bits are not used by the receiver for error detection.
A)True
B)False
Q5) Redundant bits are used by the _________ for the purpose of error detection or correction.
To view all questions and flashcards with answers, click on the resource link above. Page 8
Chapter 7: Data Link Control Protocols
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78886
Sample Questions
Q1) Containing virtually all of the features found in other data link control protocols,________ is a widely used data link control protocol.
Q2) The initiation,maintenance,and termination of a sustained data exchange require management procedures for the exchange.
A)True
B)False
Q3) An error detecting code calculated from the remaining bits of the frame, exclusive of flags,is the ________.
Q4) The receiver must be able to distinguish control information from the data being transmitted.
A)True
B)False
Q5) In a data link control protocol,________ control is achieved by retransmission of damaged frames.
A)DLHC
B)data
C)error
D)flow
Q6) The most important data link control protocol is ________.
Page 9
To view all questions and flashcards with answers, click on the resource link above.
Chapter 8: Multiplexing
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78885
Sample Questions
Q1) With time division multiplexing,modulation equipment is needed to move each signal to the required frequency band and multiplexing equipment is needed to combine the modulated signals.
A)True
B)False
Q2) Synchronous TDM is called synchronous because synchronous transmission is used.
A)True
B)False
Q3) In FDM,because multiple carriers are to be used,each is referred to as a ________.
A)subcarrier
B)channel
C)WDM
D)subscriber
Q4) Synchronous time division multiplexing can be used with ________ signals.
A)analog
B)digital signals or analog signals carrying digital data
C)digital
D)digital signals carrying digital data
Q5) The digital subscriber line combines FDM and ________ technologies.
To view all questions and flashcards with answers, click on the resource link above. Page 10
Chapter 9: Wan Technology and Protocols
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78884
Sample Questions
Q1) The packet switching network is a distributed collection of packet switching nodes.Because the nodes are distributed,there is a time delay between a change in status in one portion of the network and knowledge of that change elsewhere.
A)True
B)False
Q2) Three types of delays are: propagation delay,transmission time and ________ delay.
Q3) ________ switching is used in public telephone networks.
Q4) ________ switching was designed to provide a more efficient facility for bursty data traffic.The attached stations must organize their data into packets for transmission.
Q5) Priorities cannot be used with packet switching.
A)True
B)False
Q6) Dynamic use of bandwidth is utilized with ________.
A)virtual circuit packet switching and circuit switching
B)datagram packet switching and virtual circuit packet switching
C)circuit switching and datagram packet switching
D)space division switching and circuit switching
To view all questions and flashcards with answers, click on the resource link above. Page 11
Chapter 10: Cellular Wireless Networks
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78883
Sample Questions
Q1) In a mobile environment one of the two antennas is moving relative to the other,therefore the relative location of various obstacles moves also,so as not to hinder transmission.
A)True
B)False
Q2) The dominant technology for third generation systems is ________.
A)IMT-TC
B)UMTS
C)CDMA
D)TDMA
Q3) Nonselective,or ________,is the type of fading in which all frequency components of the received signal fluctuate in the same proportions simultaneously.
A)slow fading
B)fast fading
C)diverse fading
D)flat fading
Q4) Cells in areas of high usage can be split into smaller cells.
A)True
B)False
To view all questions and flashcards with answers, click on the resource link above. Page 12
Chapter 11: Local Area Network Overview
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78882
Sample Questions
Q1) Local Area Networks are usually owned by the organization that is using the network to interconnect equipment.
A)True
B)False
Q2) The function of a ________ protocol is to control access to the transmission medium in order to provide for an orderly and efficient use of that capacity.
Q3) The ________ specifies the mechanisms for addressing stations across the medium and for controlling the exchange of data between two users.
A)MAC
B)LLC
C)LAN
D)PDU
Q4) A ________ is where the destination MAC address indicates that all devices on the LAN should receive a copy of the frame.
A)unicast address
B)multicast address
C)simulcast address
D)broadcast address
To view all questions and flashcards with answers, click on the resource link above. Page 13
Chapter 12: Ethernet
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78881
Sample Questions
Q1) A variety of signal encoding techniques are used in the various LAN standards to achieve efficiency and to make the high data rates practical.
A)True
B)False
Q2) One of the strengths of the Fast Ethernet approach is that it readily supports a mixture of existing 10-Mbps LANs,100-Mbps LANs, and newer 16-Gpbs LANs.
A)True
B)False
Q3) Ethernet is now the preferred carrier wire line vehicle for bridging wireless technologies such as WiFi and WiMAX into local Ethernet networks.
A)True
B)False
Q4) Two frames interfering with each other at the receiver so that neither gets through is known as ________.
A)a collision
B)a backlog
C)a backoff
D)scrambling
To view all questions and flashcards with answers, click on the resource link above. Page 14
Chapter 13: Wireless Lans
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78880
Sample Questions
Q1) Enabling an employee returning from a trip to transfer data from a personal portable computer to a server in the office is an example of Nomadic access.
A)True
B)False
Q2) IEEE ________ embodies changes in three general areas: use of MIMO, enhancements in radio transmission,and MAC enhancements.
Q3) "Recommended practice for the evaluation of 802.11 wireless performance" is the scope of the ________ standard.
A)IEEE 802.11,2
B)IEEE 802.11f
C)IEEE 802.11r
D)IEEE 802.11a
Q4) A user module acts as an interface to a wireless LAN.. A)True
B)False
Q5) A hub topology,with a MAC algorithm such as CSMA to control,is appropriate for ad-hoc LANs.
A)True
B)False
To view all questions and flashcards with answers, click on the resource link above. Page 15
Chapter 14: The Internet Protocol
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78879
Sample Questions
Q1) A protocol is concerned with exchanging data between two entities.
A)True
B)False
Q2) IP addresses are usually written in ________ notation,with a decimal number representing each of the octets of the 32-bit address.
Q3) In the IPv4 Header ________ specifies how long,in seconds,a datagram is allowed to remain in the internet.
Q4) A Class C network is defined as few networks,each with many hosts.
A)True
B)False
Q5) An entity may transmit data to another entity in such a way that each PDU is treated independently of all prior PDUs.This is known as ________ data transfer.
Q6) A function performed by a receiving entity to limit the amount or rate of data that is sent by a transmitting entity is ________.
A)flow control
B)error control
C)transmission control
D)data control
To view all questions and flashcards with answers, click on the resource link above. Page 16
Chapter 15: Transport Protocols
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78878
Sample Questions
Q1) In the case of a single network,________ refers to an attached network device.
A)Port
B)Host
C)Socket
D)Entity
Q2) One header must serve to perform all protocol mechanisms.This header has a minimum length of ________ octets.
A)20
B)16
C)8
D)10
Q3) The SYN segment functions both as a connection request and as a connection acknowledgment.
A)True
B)False
Q4) A ________ timer is reset with each outgoing segment.If this timer ever expires the protocol entity is required to send a segment,even if it duplicates a previous one.
Q5) The two facilities that TCP provides for labeling data are push and ________.
Q6) In TCP the combination of port and host is referred to as a ________.
Page 17
To view all questions and flashcards with answers, click on the resource link above.
Chapter 16: Advanced Data Communications Topics
Available Study Resources on Quizplus for this Chatper
44 Verified Questions
44 Flashcards
Source URL: https://quizplus.com/quiz/78877
Sample Questions
Q1) The LFSR implementation of a cyclic error-correcting encoder is the same as that of the CRC error-detecting code.
A)True
B)False
Q2) Bose-Chaudhuri-Hocquenghem is an example of a _________ code.
Q3) When only analog transmission facilities are available,modulation is required to convert the digital data to analog form.
A)True
B)False
Q4) With the exception of the repeat-accumulate code,the LDCP code is systematic. A)True B)False
Q5) Frequency modulation and phase modulation are special cases of _________ modulation.
Q6) The syndrome indicates which of the individual parity-check equations do not equal 0.
A)True B)False
Q7) _________ codes are a widely used subclass of nonbinary BCH codes.
To view all questions and flashcards with answers, click on the resource link above. Page 18
Chapter 17: Wireless Transmission Techniques
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78876
Sample Questions
Q1) MIMO-MAC systems outperform point-to-point MIMO.
A)True
B)False
Q2) _________ antenna architecture has become a key technology in evolving high-speed wireless networks,including IEEE 802.11 Wi-Fi LANs and WiMAX.
Q3) OFDMA subcarriers are divided into groups and each group is named a ______ .
A)chip
B)hop
C)subchannel
D)SCG
Q4) MIMO systems are characterized by the number of antennas at each end of the wireless channel.
A)True
B)False
Q5) The ________ reverses the FFT operation.
Q6) The two types of MIMO transmission schemes are spatial diversity and __________ .
Q7) _______ is a multiplexing technique used with spread spectrum.
Q8) The first type of spread spectrum developed is known as _________ .
To view all questions and flashcards with answers, click on the resource link above. Page 19
Chapter 19: Routing
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78875
Sample Questions
Q1) The ________ function seeks to design routes through the network for individual pairs of communicating end nodes so that the network is used efficiently.
Q2) When the internal operation of the network is ________,a routing decision is made individually for each packet.
A)datagram
B)robust
C)internal virtual circuit
D)virtual circuit
Q3) Fairness is a requirement for a routing function.
A)True
B)False
Q4) In a ________ network,each node will remember the routing decision that was made when the virtual circuit was established,and simply pass on the packets without making a new decision.
Q5) The disadvantage of fixed routing is ________.
A)its lack of flexibility
B)its simplicity
C)it does not work with virtual circuits
D)it does not work with datagrams
To view all questions and flashcards with answers, click on the resource link above. Page 20
Chapter 20: Congestion Control
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78874
Sample Questions
Q1) When a TCP entity retransmits a segment using fast retransmit it assumes that a segment was lost,even though it has not yet timed out on that segment.
A)True
B)False
Q2) Congestion control on the basis of implicit signaling requires action on the part of network nodes.
A)True
B)False
Q3) ________ algorithm addresses RTT variance estimation.
Q4) The size of TCP's send window can have a critical effect on whether TCP can be used efficiently without causing congestion.
A)True
B)False
Q5) ________ is a measure used in the implementation of TCP congestion control measures.
A)Fast recovery
B)Slow start
C)Exponential RTO backoff
D)All of the above
To view all questions and flashcards with answers, click on the resource link above. Page 21
Chapter 21: Internetwork Operation
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78873
Sample Questions
Q1) IGMP _____ enabled a host to request to be unsubscribed from a group.
A)v1
B)v2
C)v3
D)v4
Q2) In multicasting only a single copy of the packet is ever transmitted.
A)True
B)False
Q3) A mobile node is assigned to a particular network,known as its ______ .
Q4) A ________ is a host or router that changes its point of attachment from one network or subnetwork to another.
Q5) ______ is a separate routing protocol,independent of any existing unicast routing protocol,and is designed to extract needed routing information from any unicast routing protocol and may work across multiple ASs with a number of different unicast routing protocols.
Q6) The OpenFlow specification defines three types of tables: flow table,group table,and _______ table.
Q7) Spamming of multicast groups is difficult.
A)True B)False
To view all questions and flashcards with answers, click on the resource link above. Page 22
Chapter 22: Internetwork Quality of Service
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78872
Sample Questions
Q1) A flowspec contains the following elements: service class,Rspec and ______.
A)Bspec
B)Tspec
C)Dspec
D)Sspec
Q2) The act of sending a packet from a source to multiple destinations is referred to as
Q3) A key element of the ________ is that a high percentage of transmitted packets will be successfully delivered.
A)routing service
B)best effort service
C)controlled load service
D)guaranteed service
Q4) RSVP takes a ________,or connectionless,approach in which the reservation state is cached information in the routers that is installed and periodically refreshed by end systems.
Q5) A router is able to anticipate congestion and prevent applications from causing an overload.
A)True
B)False
To view all questions and flashcards with answers, click on the resource link above. Page 23
Chapter 23: Multiprotocol Label Switching
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78871
Sample Questions
Q1) A routing algorithm develops information that can be used in determining how to handle packets with different service needs.
A)True
B)False
Q2) MPLS is intended to provide connection-oriented QoS with features similar to those found in ________.
A)Integrated Services
B)IETF
C)Differentiated Services
D)ISA
Q3) The essence of MPLS functionality is that traffic is grouped into ________.
A)FECs
B)ECN
C)LIBs
D)LSPs
Q4) Prior to the routing and delivery of packets in a given FEC,a path through the network,known as a ________,must be defined and the QoS parameters along that path must be established.
Q5) The MPLS architecture supports two routing options: hop-by-hop and ________.
To view all questions and flashcards with answers, click on the resource link above. Page 24
Chapter 24: Electronic Mail, dns, and Http
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78870
Sample Questions
Q1) _______ are server programs that hold information about a portion of the domain name tree structure and the associated RRs.
A)MIME
B)Name servers
C)DNS databases
D)Domain name space
Q2) _______ is a section in a DNS message.
A)Header
B)Question
C)Authority
D)All of the above
Q3) __________ is a facility that allows users at workstations and terminals to compose and exchange messages.
Q4) ________ supplements SMTP and allows the encapsulation of multimedia (nontext)messages inside of a standard SMTP message.
A)ADMD
B)MIME
C)DNS
D)IMAP
To view all questions and flashcards with answers, click on the resource link above. Page 25
Chapter 25: Internet Multimedia Support
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/78869
Sample Questions
Q1) The _______ is designed to support digital and analog phones and connect to IP-based networks using VoIP,as well as provide if needed a connection to the public switched telephone network using traditional technology.
Q2) The term ___________ refers to the use of multiple forms of information,including text,still images,audio,and video.
Q3) An application-level firewall may prevent the forwarding of RTP packets.
A)True
B)False
Q4) In ________ real-time applications,a deterministic upper bound on jitter and high reliability takes precedence over network utilization considerations.
Q5) A _________ is any network element that sends SIP requests and receives SIP responses.
Q6) An example of servers are _________ .
A)proxies
B)redirect servers
C)registrars
D)all of the above
Q7) The term _______ refers to software operating on a PC that implements VoIP.
Page 26
To view all questions and flashcards with answers, click on the resource link above.