Data Communications Study Guide Questions
Course Introduction
Data Communications is a foundational course that explores the principles, techniques, and technologies involved in the exchange of data between computers and networks. The course covers essential topics such as transmission media, data encoding, error detection and correction, multiplexing, data link protocols, and network topology. Students will learn about the OSI and TCP/IP models, the roles of various network devices, and the fundamentals of local and wide area networking. Through practical demonstrations and theoretical study, students gain a solid understanding of how data is transmitted efficiently, securely, and reliably across modern digital communication systems.
Recommended Textbook
Data Communications and Computer Networks A Business Users Approach 7th Edition by Curt
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13 Chapters
1238 Verified Questions
1238 Flashcards
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Chapter 1: Introduction to Computer Networks and Data Communications
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Sample Questions
Q1) The bottom layer in the OSI model-the ____ layer-handles the transmission of bits over a communications channel.
A)data link
B)application
C)physical
D)network
Answer: C
Q2) ____ is the design, installation, and support of a network and its hardware and software.
A)Convergence
B)Voice network
C)Data network
D)Network management
Answer: D
Q3) Network architectures are cohesive layers of protocols defining a set of communication services.
A)True
B)False
Answer: True
Page 3
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Chapter 2: Fundamentals of Data and Signals
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Q1) The primary advantage of a bipolar scheme is that when all the voltages are added together after a long transmission, there should be a total voltage of ____. A)-2 B)-1
C)0
D)1
Answer: C
Q2) The ASCII character set exists in a few different forms, including a ____ version that allows for 128 possible combinations of textual symbols.
A)3-bit
B)5-bit
C)6-bit
D)7-bit
Answer: D
Q3) The control character ____________________ (CR) provides control between a processor and an input/output device.
Answer: carriage return
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Chapter 3: Conducted and Wireless Media
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103 Flashcards
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Sample Questions
Q1) ____ systems transmit data over a wide range of frequencies rather than limiting transmissions to a narrow, fixed band of frequencies.
A)WiFi
B)Bluetooth
C)Ultra-wideband
D)Free space optics
Answer: C
Q2) Satellites that are always over the same point on Earth can be used for long periods of high-speed data transfers.
A)True
B)False
Answer: True
Q3) Much of the Category 3 wire sold today is used for new computer network installations.
A)True
B)False Answer: False
Q4) Multimode fiber-optic cable is labeled ____________________ cable. Answer: 62.5/125
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Chapter 4: Making Connections
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Sample Questions
Q1) During the early years of computing, a mainframe computer was called the ____.
A)secondary
B)terminal
C)dumb end
D)primary
Q2) A ____ port is a connection in which eight data lines transmit an entire byte of data at one moment in time.
A)serial
B)parallel
C)DIN
D)USB
Q3) What are the primary organizations involved in making interface standards?
Q4) What are the standards that conform the EIA-232F interface standard?
Q5) If transmitting a digital signal, use a Manchester code. Because a Manchester code always has a signal transition in the middle of each bit, the receiver can anticipate this signal transition and read the incoming data stream with no errors. A Manchester-encoded digital signal is an example of a self-clocking signal.
Q6) In ____________________, the primary creates a packet of data with the address of the intended terminal and transmits the packet.
Page 6
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Chapter 5: Making Connections Efficient: Multiplexing and Compression
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Q1) In ____________________ multiplexing, the frames of the multiplexor's output stream are divided into 24 separate digitized voice/data channels of 64 kbps each.
Q2) To allow multiple users to share a single medium, FDM assigns each user a separate ____.
A)time slot
B)transmission code
C)channel
D)amplitude
Q3) Multiplexing is a technique typically performed at the network access layer of the TCP/IP protocol suite.
A)True
B)False
Q4) Three types of synchronous time division multiplexing that are popular today are T-1 multiplexing, ____ multiplexing, and SDH.
A)EIA-232F
B)IPS/SPX
C)SONET
D)RS-232
Q5) What are the major disadvantages of frequency division multiplexing?
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Chapter 6: Errors, Error Detection, and Error Control
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Sample Questions
Q1) Error detection can be performed in several places within a communications model. One of the most common places is the TCP/IP ____ layer.
A)network
B)application
C)network access/data link
D)physical
Q2) Causes of jitter can include electromagnetic interference, ____, passing the signal through too many repeaters, and the use of lower-quality equipment.
A)coding
B)sampling
C)compression
D)crosstalk
Q3) A ____ protocol's function is simply to inform the transmitter what piece of data is expected next.
A)CRC-16
B)CRC-32
C)stop-and-wait
D)sliding window
Q4) How does frame relay control errors?
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Chapter 7: Local Area Networks: Part I
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Sample Questions
Q1) In a shared segment network, each workstation then has a private or dedicated connection.
A)True
B)False
Q2) The main hardware of the switch is called the ____________________.
Q3) A local area network cannot interface with other local area networks.
A)True
B)False
Q4) The interval during which the signals propagate down the bus and back is the ____.
A)exponential backoff
B)collision window
C)attenuation
D)bounce window
Q5) A(n) ____________________ protocol is one in which you cannot calculate the time at which a workstation will transmit.
Q6) A(n) _________________________ is a communications network that interconnects a variety of data communications devices within a small geographic area and broadcasts data at high data transfer rates.
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Chapter 8: Local Area Networks: Part II
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Sample Questions
Q1) ____ software allows a user to access all of the possible functions of a personal computer workstation from a mobile or remote location.
A)Network monitoring
B)Sniffer
C)Remote access
D)Antispyware
Q2) The wireless LAN standards call a single-cell wireless LAN a(n)
Q3) In the ____, or ad hoc, layouts configuration, there is no access point at the center of a cell.
A)peer-to-peer
B)multiple-cell
C)single-cell
D)random-cell
Q4) In a(n) ____________________ operating system, multiple programs can be running at the same time.
Q5) A(n) ____________________ is a single unit or box that supports many networking functions.
Q6) What are the functions performed by a network operating system?
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Chapter 9: Introduction to Metropolitan Area Networks and
Wide Area Networks
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Sample Questions
Q1) A network that is connected in a ____ is one in which neighbors are connected only to neighbors.
A)star
B)mesh
C)bus
D)star-bus
Q2) The ____-switched network is most often found in networks designed to transfer computer data (such as the Internet).
A)circuit
B)packet
C)protocol
D)port
Q3) A connection-oriented network application provides what is called a(n) ___________ service.
Q4) When all the routing information is in one place, it is difficult to make updates to the routing information.
A)True
B)False
Page 11
Q5) The ability to reroute in the event of a failure is called ____________________.
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Chapter 10: The Internet
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Q1) When the user wants to send an e-mail message, the e-mail program takes the e-mail message and passes it to the transport layer of the software.
A)True
B)False
Q2) During the late 1960s, ARPA created one of the country's first wide area packet-switched networks, the ____________________.
Q3) An e-mail program creates a(n) ____ document and attaches it to the e-mail message.
A)Multipurpose Internet Mail Extensions (MIME)
B)Address Resolution Message (ARM)
C)Transport Control Protocol (TCP)
D)Internet Protocol (IP)
Q4) The Window field of the TCP header cannot be set to zero.
A)True
B)False
Q5) Intranets use essentially the same hardware and software that is used by other network applications.
A)True
B)False
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Chapter 11: Voice and Data Delivery Networks
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Sample Questions
Q1) ____ means that users have the ability to control a call-for example, set up a conference call-without being a part of it.
A)Third-party call control
B)Unified messaging
C)Fax-back
D)Integrated voice recognition and response
Q2) When a VCC transmits network management and routing signals, it is called the ____.
A)virtual path connection (VPC)
B)virtual interface connection (VIC)
C)network-network interface
D)network-user interface
Q3) Frame relay was originally designed and used to transfer packets of data between two sites more cost effectively than leased lines could.
A)True
B)False
Q4) ____________________ is a slower format compared to ADSL; also known as Universal DSL, G.Lite, and splitterless DSL.
Q5) What are the advantages and disadvantages of ATM?
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Chapter 12: Network Security
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Sample
Questions
Q1) Public key cryptography is also called ____________________ encryption.
Q2) The physical protection of a computer system or a computer network consists of protecting the equipment from physical damage.
A)True
B)False
Q3) A(n) ______________________________ is either specialized software on a network or a trusted third-party organization or business that issues and manages certificates.
Q4) The ___________________________________ was selected by the U.S. government to replace DES.
Q5) If e-mail messages have a return address of someone other than the person actually sending the e-mail, then the sender is ____.
A)e-mail bombing
B)spoofing
C)smurfing
D)firewalling
Q6) ____________________ techniques that observe and record some aspect of the user, such as voiceprints, fingerprints, eyeprints, and faceprints, appear to be the wave of the future to replace passwords.
Page 14
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Chapter 13: Network Design and Management
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Sample Questions
Q1) Analyzing and designing a new computer system can be time-consuming and expensive.
A)True
B)False
Q2) Computer simulations are easy to create, mainly because it is difficult to make mistakes in the modeling process and easy to discover them.
A)True
B)False
Q3) Two technologies in computer networking that often generate revenue are wireless LANs and network security.
A)True
B)False
Q4) Capacity planning is a fairly easy and fast operation.
A)True
B)False
Q5) In order to create a(n) ____________________ connectivity map, the modeler begins by identifying each site or location in which the company has an office.
Q6) What are the SDLC phases?
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