Data Communications
Chapter Exam Questions
Course Introduction
Data Communications explores the fundamental principles and technologies involved in the transmission of data between devices and networks. The course covers key topics such as data representation, transmission media, encoding techniques, multiplexing, error detection and correction, and the OSI and TCP/IP reference models. Students will gain an understanding of the hardware and protocols that enable reliable communication, the functioning of local and wide area networks, and the impact of emerging technologies on data exchange. Practical exercises and case studies provide hands-on experience with configuring and analyzing data communication systems, preparing students for roles in networking and information technology fields.
Recommended Textbook Network+ Guide to Networks 5th Edition by Tamara Dean
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Chapter 1: An Introduction to Networking
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Q1) ____ are the distinct units of data that are exchanged between nodes on a network. A) Segments
B) Data packets
C) Topologies
D) Protocols
Answer: B
Q2) A ____ is a specialized device that allows multiple networks or multiple parts of one network to connect and exchange data.
A) segment
B) host
C) node
D) connectivity device
Answer: D
Q3) Describe license tracking in networks.
Answer: License tracking determines how many copies of a single application are currently in use on the network and ensures that number does not exceed the number of licenses purchased.This information is important for legal reasons,as software companies are vigilant about illegally copying software or using more than the authorized number of copies.
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Chapter 2: Network Standards and the OSI Model
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Q1) The ____ is a fixed number associated with a device's NIC.
A) LLC address
B) frame address
C) logical address
D) physical address
Answer: D
Q2) Which OSI model layer manages data encryption?
A) Physical
B) Session
C) Application
D) Presentation
Answer: D
Q3) An international society composed of engineering professionals with goals of promoting development and education in the electrical engineering and computer science fields.
Answer: C
Q4) Network functions are associated with only one layer of the OSI model.
A)True
B)False
Answer: False
Page 4
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Chapter 3: Transmission Basics and Networking Media
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Q1) The use of 1s and 0s to represent information is characteristic of a(n)____________________ system.
Answer: binary
Q2) Describe a drawback of analog signals.
Answer: One drawback to analog signals is that their voltage is varied and imprecise.Thus,analog transmission is more susceptible to transmission flaws such as noise,or any type of interference that may degrade a signal,than digital signals.
Q3) Part of the network that does not contain end nodes.
Answer: G
Q4) Describe two benefits of digital signaling that make it worthwhile even though extra signaling pulses are involved.
Answer: Because digital transmission involves sending and receiving only a pattern of 1s and 0s,represented by precise pulses,it is more reliable than analog transmission,which relies on variable waves.In addition,noise affects digital transmission less severely.
Q5) 3____________________ transmission involves one transmitter and multiple receivers.
Answer: Point-to-multipoint
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Page 5
Chapter 4: Introduction to TCP/IP Protocols
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Q1) ____ is a utility that can verify that TCP/IP is installed,bound to the NIC,configured correctly,and communicating with the network.
A) ARP
B) PING
C) Telnet
D) FTP
Q2) In most cases,BOOTP has been surpassed by the more sophisticated IP addressing utility,____.
A) DNS
B) RARP
C) DHCP
D) APIPA
Q3) A(n)____ address represents any one interface from a group of interfaces,any one of which can accept a transmission.
A) anycast
B) unicast
C) multicast
D) singlecast
Q4) Describe the Time to Live (TTL)field in an IP datagram.
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Chapter 5: Topologies and Ethernet Standards
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Q1) Given their long-distance capabilities,10GBase-ER and 10GBase-EW are best suited for use on ____.
A) VANs
B) MANs
C) LANs
D) WANs
Q2) The most common 1-Gigabit Ethernet.
Q3) A physical topology ____.
A) specifies device types
B) depicts a network in broad scope
C) specifies connectivity methods
D) specifies addressing schemes
Q4) All Ethernet networks,independent of their speed or frame type,use an access method called ____.
A) CSMA
B) CSMA/DC
C) CSAM/CD
D) CSMA/CD
Q5) Follows the 5-4-3 rule of networking.
Q6) Refers to the PoE device that supplies the power.
Page 7
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Chapter 6: Network Hardware
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Q1) A ____ is a repeater with more than one output port.
A) bridge
B) switch
C) hub
D) router
Q2) The primary difference between the two USB standards is ____.
A) connector pin organization
B) security limitations
C) speed
D) transceiver placement
Q3) Have no means to interpret the data they retransmit.
Q4) Explain why network engineers value VLANs.Include a discussion on reasons for using VLANs.
Q5) Explain hybrid routing protocols.Describe an example.
Q6) It is best to perform connectivity tests on a computer connected to a live network.
A)True
B)False
Q7) Define wireless NICS.Include a description of disadvantages with their use.
Q8) Describe advantages of VLAN trunking.
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Chapter 7: WANs and Remote Connectivity
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Q1) In a star topology,a single connection failure will halt all traffic between all sites.
A)True
B)False
Q2) Describe two important considerations when designing a VPN.
Q3) A ____ converts digital signals into analog signals for use with ISDN phones and other analog devices.
A) terminal adapter
B) DSLAM
C) smart jack
D) terminator
Q4) ____ is the standard for connecting home computers to an ISP via DSL or broadband cable.
A) SLIP
B) SLIPoE
C) PPP
D) PPPoE
Q5) Occurs when each site is directly connected to no more than two other sites in a serial fashion.
Q6) Define a fractional T1 and explain why an organization might implement it.
Page 9
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Chapter 8: Wireless Networking
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Q1) The locations of the transmitter and receiver do not move.
Q2) Transmission from a satellite transponder to an earth-based dish-shaped antenna.
Q3) ____ is an 802.11n feature that allows two adjacent 20-MHz channels to be combined to make a 40-MHz channel.
A) Channel bonding
B) Channel aggregation
C) Frame aggregation
D) Frame bonding
Q4) Using Bluetooth version 2.0,communicating nodes can be as far as ____ meters apart.
A) 30
B) 100
C) 300
D) 330
Q5) Spread spectrum is a popular way of making wireless transmissions more secure.
A)True
B)False
Q6) Describe the original design intentions for Bluetooth.Follow this with an explanation of why Bluetooth proved to be impractical for business LANs and what the technology supports today.
Page 10
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Chapter 9: Network Operating Systems
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Q1) Describe the key difference between freely distributable UNIX and proprietary implementations.
Q2) The primary function of the UNIX ____ is to coordinate access to all your computer's hardware,such as the disks,memory,keyboard,and monitor.
A) kernel
B) root
C) directory system
D) pipe system
Q3) The support and use of multiple processors to handle multiple threads is known as ____.
A) multiprocessing
B) multitasking
C) multithreading
D) multisharing
Q4) A benefit to using an NTFS partition is that it can be read by older operating systems,such as Windows 95,Windows 2000 Professional,and early versions of UNIX.
A)True
B)False
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Chapter 10: In-Depth TCP/IP Networking
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Q1) When using classful IPv4 addressing,a network ID always ends with an octet of ____.
A) 0
B) 00000000
C) 1
D) 255
Q2) The gateways that make up the Internet backbone are called ____ gateways.
A) proxy
B) core
C) Internet
D) default
Q3) The TCP/IP administration utility for use with Windows NT,2000,XP,Vista,Server 2003,and Server 2008 operating systems.
Q4) The TCP/IP configuration and management utility used on UNIX and Linux systems.
Q5) An example of a popular mail server is ____.
A) Eudora
B) Microsoft Outlook
C) AOL mail
D) Microsoft Exchange Server
Q6) Useful only on networks that run Windows-based operating systems and NetBIOS.
Page 12
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Chapter 11: Voice and Video Over IP
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Q1) A computer programmed to act like an IP telephone is known as a(n)____.
A) video phone
B) softphone
C) streaming server
D) compu-phone
Q2) Using VoIP over a WAN allows an organization to avoid paying long-distance telephone charges,a benefit known as ____.
A) charge bypass
B) distance bypass
C) toll bypass
D) easypass
Q3) IP telephones are directly connected to the local loop.
A)True
B)False
Q4) Explain why MGCs are especially advantageous on large VoIP networks.
Q5) Describe five features unique to IP telephones.
Q6) Besides being extremely mobile,describe another advantage to softphones.
Q7) Any node that provides audio,visual,or data information to another node.
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Q8) Helps voice and video networks overcome UDP's shortcomings.
Q9) The nerve center for networks that adhere to H.323.
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Page 14
Chapter 12: Network Security
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Q1) ____ is a method of encrypting TCP/IP transmissions.
A) PGP
B) IPSec
C) PAP
D) SSL
Q2) A firewall that protects only the computer on which it is installed.
Q3) A ____ attack occurs when an Internet chat user sends commands to a victim's machine that cause the screen to fill with garbage characters and requires the victim to terminate their chat sessions.
A) flashing
B) denial-of-service
C) war driving
D) phishing
Q4) A ____ attack occurs when a hacker uses programs that try a combination of a user ID and every word in a dictionary to gain access to the network.
A) flashing
B) denial-of-service
C) dictionary
D) brute force
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Chapter 13: Troubleshooting Network Problems
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Q1) A help desk is typically staffed with ____________________ - people proficient in workstation and network troubleshooting.
Q2) Resistance is measured in ____.
A) ohms
B) hertz
C) centimeters
D) volts
Q3) Describe three advantages of using wireless network tools.
Q4) A ____ usually results from a bad NIC.
A) jabber
B) ghost
C) giant
D) runt
Q5) The device used to measure resistance.
Q6) List five questions that may help a network professional determine whether a problem's symptoms are truly reproducible and,if so,to what extent.
Q7) Describe how a network administrator should react upon discovering that a network change has generated a problem.
Q8) Instrument that checks whether a cable is conducting current.
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Chapter 14: Ensuring Integrity and Availability
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Q1) Define mirroring and server mirroring.Describe the necessary requirement for server mirroring.
Q2) Power that is free from noise is called "____" power.
A) clear
B) clean
C) filtered
D) white
Q3) Describe an alert known as a hoax.
Q4) ____ is a type of media capable of storing digitized data and that uses a laser to write data to it and read data from it.
A) Tape backup media
B) Optical media
C) Fiber optic media
D) USB
Q5) Many bots spread through the _________________________,a protocol that enables users running IRC client software to communicate instantly with other participants in a chat room on the Internet.
Q6) Describe a backup rotation scheme and explain the goal of a good scheme.
Q7) Describe how an organization implements anti-malware software.
Page 17
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Chapter 15: Network Management
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Q1) The most critical type of software upgrade you will perform is an upgrade to your
A) database
B) application
C) NOS
D) backbone
Q2) The most common type of caching is ____ caching.
A) online
B) Web
C) Internet
D) device
Q3) Describe how to select an asset management tool.
Q4) ____is the local storage of frequently needed files that would otherwise be obtained from an external source.
A) Swapping
B) Paging
C) Caching
D) Segmentation
Q5) Describe the preparation and implementation requirements when upgrading a networked printer.
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