Computer Networks
Mock Exam
Course Introduction
Computer Networks explores the principles, architectures, protocols, and technologies that enable communication between computers and devices over local and wide-area networks. This course covers fundamental topics such as network models (OSI and TCP/IP), data transmission, switching, routing algorithms, congestion control, and network security. Students will also study application-layer protocols, wireless and mobile networking, network management, and emerging trends such as the Internet of Things (IoT). Through lectures, hands-on labs, and projects, students gain practical experience in designing, implementing, and troubleshooting network solutions.
Recommended Textbook
Data Communications and Computer Networks A Business Users Approach 8th Edition by Curt
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13 Chapters
1235 Verified Questions
1235 Flashcards
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Chapter 1: Introduction to Computer Networks and Data Communications
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Sample Questions
Q1) A dictionary might define "____________________" as the process of coming together toward single point.
Answer: convergence
Q2) Explain what is meant by personal area network-to-workstation connections.
Answer: The personal area network was created in the late 1990s and is one of the newer forms of computer networks.Using wireless transmissions with devices such as personal digital assistants (PDAs),laptop computers,and portable music players,an individual can transfer voice,data,and music from handheld devices to other devices such as microcomputer workstations.Likewise,a user can download data from a workstation to one of these portable devices.For example,a user may use a PDA to record notes during a meeting.Once the meeting is over,the user can transmit the notes over a wireless connection from the PDA to his or her workstation.The workstation then runs a word processor to clean up the notes,and the formatted notes are uploaded to a local area network for corporate dissemination.
Q3) The top layer in the OSI model is the ____________________ layer,where the application using the network resides.
Answer: application
Q4) ____________________ are sets of rules used by communication devices. Answer: Protocols
Page 3
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Chapter 2: Fundamentals of Data and Signals
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Sample Questions
Q1) Attenuation in a medium such as copper wire is a logarithmic loss and is a function of distance and the resistance within the wire.
A)True
B)False
Answer: True
Q2) ASCII is one of the supported code charts in Unicode.
A)True
B)False
Answer: True
Q3) The ____ encoding scheme has a voltage change at the beginning of a 1 and no voltage change at the beginning of a 0.
A) nonreturn to zero inverted (NRZI)
B) nonreturn to zero-level (NRZ-L)
C) Manchester
D) Differential Manchester
Answer: A
Q4) Converting analog data to digital signals is generally called
Answer: digitization
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Chapter 3: Conducted and Wireless Media
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103 Flashcards
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Sample Questions
Q1) ____ transmission uses a slightly thicker fiber cable and an unfocused light source,such as an LED.
A) Multimode
B) Reflection
C) Single-mode
D) Refraction
Answer: A
Q2) ____ technology uses digital signaling in which the cable carries only one channel of digital data.
A) Broadband coaxial
B) CAT 7
C) Baseband coaxial
D) Fiber optic
Answer: C
Q3) Two major coaxial cable technologies exist and are distinguished by the type of signal each carries: baseband and ____________________.
Answer: broadband
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) To prepare a data character for transmission,a ____ bit is added to the beginning of the character and informs the receiver that an incoming data frame is arriving.
A) start
B) stop
C) end
D) parity
Q2) A(n)____________________ bit performs an error check on only the data bits.
Q3) SCSI is a ____ interface and not just an interface technique for hard disk drives.
A) systems
B) terminal
C) server
D) driver
Q4) The ____ component of an interface describes how the particular circuits are used to perform an operation.
A) electrical
B) functional
C) procedural
D) mechanical
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Chapter 5: Making Connections Efficient: Multiplexing and Compression
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Sample Questions
Q1) ____ gives each incoming source signal a turn to be transmitted,proceeding through the sources in round-robin fashion.
A) Statistical time division multiplexing (Stat TDM)
B) Empirical time division multiplexing (ETDM)
C) Synchronous time division multiplexing (Sync TDM)
D) Fixed time division multiplexing (FTDM)
Q2) One way to make a connection between two devices more efficient is to compress the data that transfers over the connection.
A)True
B)False
Q3) One of the more common and simpler examples of lossless compression is ____________________-length encoding.
Q4) Each STS level supports a particular data rate and is supported by a physical specification called a(n)____________________.
Q5) ____________________ is a modulation technique that involves a four-bit code in which eight phase angles have a single amplitude,and four phase angles have double amplitudes.
Q6) How does time division multiplexing work?
Page 7
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Chapter 6: Errors, Error Detection, and Error Control
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Sample Questions
Q1) Returning a message was one of the first error-control techniques developed.
A)True
B)False
Q2) Installing proper shielding on cables prevents ____.
A) white noise
B) impulse noise
C) attenuation
D) crosstalk
Q3) TCP performs error detection at the end points of the connection.
A)True
B)False
Q4) ____ is the result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one device to another.
A) White noise
B) Jitter
C) Attenuation
D) Echo
Q5) A(n)_________________________ is an industry-approved bit string that is used to create the cyclic checksum remainder.
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Chapter 7: Local Area Networks: Part I
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Sample Questions
Q1) A(n)____________________ is a logical subgroup within a local area network that is created via switches and software rather than by manually moving wiring from one network device to another.
Q2) Designed for LANs,the ____________________ observes network traffic flow and uses this information to make future decisions regarding frame forwarding.
Q3) The tap is a(n)____________________,as it does not alter the signal and does not require electricity to operate.
Q4) All bus networks share a major disadvantage: In general,it is difficult to add a new workstation if no tap currently exists.
A)True
B)False
Q5) In IEEE 802.3 standard for CSMA/CD,frames shorter than 64 bytes are considered ____________________,or frame fragments.
Q6) A hub is designed to perform much faster than a switch. A)True
B)False
Q7) How does a star-wired bus topology work?
Q8) What are some of the application areas where a LAN can be an effective tool?
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Chapter 8: Local Area Networks: Part II
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Sample Questions
Q1) When peer-to-peer networks first appeared roughly 30 years ago,they were serverless networks.
A)True
B)False
Q2) ____ software is the application or set of programs that stores Web pages and allows browsers from anywhere in the world to access those Web pages.
A) Remote access
B) Network monitoring
C) Web server
D) Antivirus
Q3) _____________________________________________ is a collection of techniques for interfacing multiple hard disk drives to a computer.
Q4) On most network operating systems,the client workstation must be loaded with a substantial set of software.With ____,all a user needs on his or her client workstation is a Web browser.
A) NetWare 3
B) NetWare 4
C) NetWare 5
D) NetWare 6
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Chapter 9: Introduction to Metropolitan Area Networks and
Wide Area Networks
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Sample Questions
Q1) In a(n)____________________ packet-switched network,each data packet can follow its own,possibly unique,course through the sub-network.
Q2) 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
Q3) Ciccuit-switched networks will someday replace packet-switched networks.
A)True
B)False
Q4) When a user stores data in "the cloud",the data is stored on the user's premise in what is called a "cloud server".
A)True
B)False
Q5) You can assign many meanings to the weights in a weighted network graph. A)True
B)False
Q6) Provide and explain an example of a circuit-switched network.
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Chapter 10: The Internet
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Sample Questions
Q1) Intranets use essentially the same hardware and software that is used by other network applications.
A)True
B)False
Q2) ____ is a client/server protocol in which e-mail is received and held for you at your Internet server.
A) Hypertext Transfer Protocol (HTTP)
B) File Transfer Protocol (FTP)
C) Domain Name Service (DNS)
D) Internet Message Access Protocol (IMAP)
Q3) Like its counterpart IP,TCP is a fairly streamlined protocol.
A)True
B)False
Q4) ___________________________________ was introduced in 1998 by the Internet Engineering Task Force specifically for supporting the transfer of voice over the Internet.
Q5) HTML pages are simple,static text documents that browsers read,interpret,and display on the screen.
A)True
B)False
Page 12
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Chapter 11: Voice and Data Delivery Networks
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Sample Questions
Q1) When a VCC transmits user-to-network control signaling,the connection is called the
Q2) ____ is a popular format that transmits the downstream data at a faster rate than the upstream rate.
A) Asymmetric digital subscriber line (ADSL)
B) Consumer DSL (CDSL)
C) DSL Lite
D) High bit-rate DSL (HDSL)
Q3) The frame relay service can only be a long-distance service.
A)True
B)False
Q4) MPLS on Internet routers and VPNs (virtual private networks)are gaining in popularity in the data network market.
A)True
B)False
Q5) Frame relay is called a layer 6 protocol.
A)True
B)False
Q6) What does a business or home user need to establish a DSL connection?
Page 13
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Chapter 12: Network Security
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Sample Questions
Q1) The ____ is a commonly employed encryption method used by businesses to send and receive secure transactions.
A) firewall
B) Trojan horse
C) Data Encryption Standard (DES)
D) TCP
Q2) ____ usually involves having a software program that monitors every transaction within a system.
A) Firewalling
B) Routing
C) Access rights
D) Computer auditing
Q3) A ____ virus mutates with every infection,thus making them difficult to locate.
A) polymorphic
B) macro
C) boot sector
D) file infector
Q4) A(n)____________________ is a system or combination of systems that supports an access control policy between two networks.
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Chapter 13: Network Design and Management
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Sample Questions
Q1) One technique used to model a corporation's network environment is to create
A) link shadows
B) node approaches
C) dots model
D) connectivity maps
Q2) A very popular sniffer that can be used on Unix and Windows networks is Ethereal/Wireshark.
A)True
B)False
Q3) In a payback analysis,the ____ values are the running sums of the Time-Adjusted Benefits over all the years.
A) Time-Adjusted Benefits
B) Cumulative Time-Adjusted Benefits
C) Cumulative Time-Adjusted Costs
D) Time-Adjusted Costs
Q4) ______________________________ is the average time necessary to repair a failure within the computer network.
Q5) What are the SDLC phases?
Q6) What are the skills needed by a network administrator?
Page 15
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