Data Communications and Networking Textbook Exam
Questions
Course Introduction
Data Communications and Networking provides an introduction to the fundamental concepts and technologies that enable the exchange of data in modern computer networks. The course covers the principles of data transmission, network hardware and media, network architecture, and the layered network models such as OSI and TCP/IP. Students explore protocols for error and flow control, switching and routing, local and wide area networks (LANs and WANs), and wireless communication. Emphasis is placed on practical applications, network security, and emerging trends in networking, preparing students to understand and troubleshoot data communication systems in a variety of environments.
Recommended Textbook
Network Guide to Networks 6th Edition by Tamara Dean
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Chapter 1: An Introduction to Networking
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Sample Questions
Q1) To prepare to enter the networking field, a student should master a number of general networking technologies.
A)True
B)False
Answer: True
Q2) Besides an aptitude for logical and analytical thinking, describe additional skills desirable in the networking field.
Answer: Aspiring network professionals also should acquire these skills:
· Installing, configuring, and troubleshooting network server software and hardware
· Installing, configuring, and troubleshooting network client software and hardware
· Understanding the characteristics of different transmission media
· Understanding network design
· Understanding network protocols
· Understanding how users interact with the network
· Constructing a network with clients, servers, media, and connectivity devices
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Chapter 2: Network Standards and the OSI Model
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Sample Questions
Q1) Each network node has ____ types of addresses.
A) two
B) three
C) four
D) five
Answer: A
Q2) Which type of protocol is useful when data must be transferred quickly?
A) connection-oriented
B) connectionless
C) TCP
D) IP
Answer: B
Q3) ____ is the process of reconstructing segmented data.
A) Reassembly
B) Reengineering
C) Resegmenting
D) Realigning
Answer: A
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Chapter 3: Transmission Basics and Networking Media
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Sample Questions
Q1) Explain how half-duplex transmissions work.
Answer: In half-duplex transmission, signals may travel in both directions over a medium but in only one direction at a time. Half-duplex systems contain only one channel for communication, and that channel must be shared for multiple nodes to exchange information.
Q2) The more twists per foot in a pair of wires, the more resistant the pair will be to ____.
A) throughput
B) attenuation
C) cross talk
D) latency
Answer: C
Q3) Which connector is used in RS-232 transmissions?
A) DB-25
B) ST
C) BNC
D) Cat-5
Answer: A
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Chapter 4: Introduction to TCP/IP Protocols
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Sample Questions
Q1) Describe the subnet mask and how they are assigned.
Q2) Define and describe Zeroconf (Zero Configuration).
Q3) A UDP header contains ____fields.
A) four
B) six
C) eight
D) ten
Q4) If your network does not need or use APIPA, it must be uninstalled to avoid conflicts.
A)True
B)False
Q5) The command used to view IP information on a Windows workstation is ipconfig.
A)True
B)False
Q6) In IPv4 addressing, an IP address whose first octet is in the range of 192-223 belongs to a Class ____ network.
A) A
B) B
C) C
D) D
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Chapter 5: Topologies and Ethernet Standards
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Sample Questions
Q1) The smallest LANs do not have a backbone.
A)True
B)False
Q2) On an Ethernet network, a(n) ____ is the portion of a network in which collisions occur if two nodes transmit data at the same time.
A) collision domain
B) crash domain
C) interference domain
D) duplicate domain
Q3) Given their long-distance capabilities, 10GBase-ER and 10GBase-EW are best suited for use on ____.
A) VANs
B) MANs
C) LANs
D) WANs
Q4) Explain why it is important to understand logical topologies.
Q5) Explain how the distributed backbone is connected. Include a description of its benefits.
Q6) What does the SFD identify?
Q7) Explain the 5-4-3 rule of networking.
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Chapter 6: Network Hardware, Switching, and Routing
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Sample Questions
Q1) A(n) ____________________ NIC is integrated into the motherboard.
Q2) Describe two popular types of gateways.
Q3) A ____ can interpret physical addressing information.
A) repeater
B) switch
C) hub
D) bridge
Q4) A computer's ____________________ is the circuit, or signaling pathway, used by the motherboard to transmit data to the computer's components, including its memory, processor, hard disk, and NIC.
Q5) Each time a computer starts up, the device drivers for all its connected peripherals are loaded into ____.
A) ROM
B) EEPROM
C) RAM
D) CMOS
Q6) Describe the IS-IS routing protocol.
Q7) A(n) ____________________ is software that enables an attached device to communicate with the computer's operating system.
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Chapter 7: Wide Area Networks
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Sample Questions
Q1) List and describe the key strengths of SONET.
Q2) What sets ATM apart from Ethernet is its ____ size.
A) channel
B) frame
C) variable packet
D) fixed packet
Q3) A(n) ____________________ uses TDM (time division multiplexing) over two wire to divide a single channel into multiple channels.
Q4) A ____ connection is one in which a user connects her computer, via a modem, to a distant network and stays connected for a finite period of time.
A) remote
B) direct
C) dial-up
D) virtual
Q5) Describe the fundamental properties WANs and LANs have in common.
Q6) Define the term xDSL and name the better known DSL varieties.
Q7) Why is SONET technology typically not implemented by small or medium-size businesses?
Q8) Describe an important difference between frame relay and X.25.
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Chapter 8: Wireless Networking
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Sample Questions
Q1) ____ may use either the 2.4-GHz or 5-GHz frequency range.
A) 802.11a
B) 802.11b
C) 802.11g
D) 802.11n
Q2) To establish a satellite Internet connection, each subscriber must have a ____.
A) dish antenna
B) line-of-sight antenna
C) dish pathway
D) source pathway
Q3) Wireless networks are laid out using the same topologies as wired networks.
A)True
B)False
Q4) What is the purpose of the Frame Control field in an 802.11 frame?
Q5) In the case of connecting two WLANs, access points could be as far as ____ feet apart.
A) 500
B) 800
C) 1000
D) 1200
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Chapter 9: In-Depth TCP/IP Networking
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Sample Questions
Q1) IMAP4 servers require less storage space and usually more processing resources than POP servers do.
A)True
B)False
Q2) SMTP operates from port ____.
A) 25
B) 11
C) 110
D) 250
Q3) Explain how hiding IP addresses on private networks allows network managers more flexibility in assigning addresses.
Q4) The ____ utility allows you to view a host's routing table.
A) nbstat
B) pathping
C) dig
D) route
Q5) The combination of additional bits used for subnet information plus the existing network ID is known as the ____________________.
Q6) Explain why SNAT is considered static and describe why this is useful.
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Chapter 10: Virtual Networks and Remote Access
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Sample Questions
Q1) Where do virtual switches or bridges and their configuration reside?
Q2) Using a virtualization program, you can create dozens of different VMs.
A)True
B)False
Q3) In the NAT networking mode, a vNIC relies on the ____ to act as a NAT device.
A) guest machine
B) reference machine
C) host machine
D) management machine
Q4) In a(n) ____________________ VPN, clients, servers, and other hosts establish tunnels with a private network using a remote access server or VPN gateway.
Q5) Describe the L2TP technology.
Q6) To connect to a network, a virtual machine requires a ____.
A) virtual switch
B) virtual adapter
C) physical switch
D) virtual MAC address
Q7) The software required to establish VPNs is usually expensive.
A)True
B)False
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Chapter 11: Network Security
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Sample Questions
Q1) Human errors, ignorance, and omissions cause more than half of all security breaches sustained by networks.
A)True
B)False
Q2) A NOS that contains a "back door"is an example of a risk associated with ____.
A) people
B) transmission and hardware
C) protocols and software
D) Internet access
Q3) Describe the three-way handshake used in CHAP.
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
Q5) Define and describe PAP.
Q6) Describe one potential flaw in CHAP and MS-CHAP authentication and explain how it is resolved.
Page 13
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Chapter 12: Voice and Video Over IP
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Sample Questions
Q1) Many network engineers consider ____ to be superior to MGCP.
A) SIP
B) RTCP
C) MEGACO
D) MGC
Q2) One drawback to ____ video is that content may not be edited before it's distributed.
A) on demand
B) live streaming
C) streaming server
D) VoIP
Q3) Describe six functions performed by signaling protocols.
Q4) A(n) ____ is a computer that manages multiple media gateways.
A) MPLS
B) MGCP
C) MEGACO
D) MGC
Q5) How does implementing VoIP assist in centralizing voice and data network management?
Page 14
Q6) Aside from extreme mobility, describe another advantage to softphones.
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Chapter 13: Troubleshooting Network Problems
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Sample Questions
Q1) ____ is the telltale factor for ascertaining where faults in a cable lie.
A) Resistance
B) Impedance
C) Voltage
D) Current
Q2) Rather than issue an electrical signal over the cable as twisted pair cable testers do, a(n) ____________________ transmits light-based signals of different wavelengths over the fiber.
Q3) A ____ is a document (preferably online) that lists every service and software package supported within an organization, plus the names of first- and second-level support contacts for those services or software packages.
A) call tracking list
B) help desk program list
C) supported services list
D) change management list
Q4) A sophisticated ____________________ will include a TDR (time domain reflectometer) that issues a signal on a cable and then measures the way the signal bounces back (or reflects) to the TDR.
Q5) Describe five functions all network monitoring tools perform.
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Chapter 14: Ensuring Integrity and Availability
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Sample Questions
Q1) ____________________ is the process of restoring your critical functionality and data after an enterprise-wide outage that affects more than a single system or a limited group of users.
Q2) Describe the key to fault tolerance in network design. Provide examples of fault tolerant topologies.
Q3) ____ 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
Q4) ____ scanning techniques attempt to identify malware by discovering "malware-like" behavior.
A) Integrity checking
B) Polymorphic
C) Signature
D) Heuristic
Q5) What is integrity checking?
Q6) Describe how an organization implements anti-malware software.
Page 16
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Chapter 15: Network Management
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Sample Questions
Q1) Explain how to gather baseline data on a network.
Q2) ____ upgrades typically overwrite some system files on the workstation, so their installation may affect other applications adversely.
A) Principle
B) Application
C) Patch
D) Full
Q3) The most comprehensive and complex upgrade involving network hardware is a ____ upgrade.
A) cabling
B) printer
C) NOS
D) backbone
Q4) A(n) ____ is a graphical representation of a network's wired infrastructure.
A) Multi Router Traffic Grapher
B) network diagram
C) wiring schematic
D) event viewer
Q5) Describe the preparation and implementation requirements when upgrading a network printer.
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