Computer Networks
Exam Practice Tests
Course Introduction
Computer Networks is a comprehensive course that explores the principles, protocols, and architectures underlying modern computer networking. Students will learn about network models, data transmission techniques, LANs, WANs, wireless networks, and foundational protocols such as TCP/IP and UDP. The course covers crucial concepts including routing, switching, network security, congestion control, and application-layer services. Through both theoretical study and hands-on lab exercises, students develop a practical understanding of how information is exchanged across networks, enabling them to design, implement, troubleshoot, and secure networked systems in a variety of real-world settings.
Recommended Textbook
Business Data Communications Infrastructure Networking and Security 7th Edition by William Stallings
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Chapter 1: Introduction
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Q1) The concept that describes the merger of previously distinct telephony and information technologies and markets is called ___________.
A)unification
B)outsourcing
C)merger
D)convergence
Answer: D
Q2) In the past,the data processing function was organized around a single computer.Today,it is much more common to find many computers linked by networks.This approach to data processing is called:
A)decentralized computing
B)client computing
C)distributed computing
D)connected computing
Answer: C
Q3) A __________ is the element that provides UC users with a unified user interface across communication devices.
Answer: RTC (real-time communications)dashboard
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Chapter 2: Business Information
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Q1) Response time is extremely important when implementing email systems.
A)True
B)False
Answer: False
Q2) Which of the following represents the most basic unit of digital information?
A)byte
B)nibble
C)pixel
D)bit
Answer: D
Q3) When transmitting video information,compression ratios can range as high as 100:1 with little loss of perceived quality.
A)True
B)False
Answer: True
Q4) The _________ (IRA)character set is the most common format for English language text files.
Answer: ASCII
Q5) A representation of images that uses an array of pixels is called ______. Answer: raster graphics
Page 4
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Chapter 3: Distributed Data Processing
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Q1) Replicated databases involve copying all or part of the database to additional computers.
A)True
B)False
Answer: True
Q2) The three types of requirements for networking resulting from DDP are connectivity,availability,and performance.
A)True
B)False
Answer: True
Q3) _________ are specialized computers that provide services for clients such as database services,printing services,and communication services.
Answer: Servers
Q4) An _________ provides users of client devices with applications associated with the Internet but isolated within the organization.
Answer: intranet
Q5) ________ is the creation of a virtual,rather than actual,version of something. Answer: Virtualization
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Chapter 4: Data Transmission
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Q1) The _________ of a signal is defined as the distance between two points of corresponding phase of two consecutive cycles,such as maximum amplitudes or where the wave crosses zero.
Q2) The loudness of a signal is measured by its amplitude.
A)True
B)False
Q3) The four categories of noise are: thermal noise,intermodulation,impulse noise,and
Q4) Refraction refers to the bending of the signal.
A)True
B)False
Q5) Delay distortion is due to:
A)wait times between keyboard entry and actual transmission of data
B)portions of the signal arriving at the destination at different times
C)varying levels of signal strength
D)signals generated by internetworking equipment
Q6) Impulse noise is the primary source of error in digital data communication.
A)True
B)False
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Q7) The width of the range of frequencies that comprise the signal is the ________.
Chapter 5: Data Communication Fundamentals
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Q1) If a carrier wave is modulated with 4 amplitudes and 4 phase changes,how many possible signal combinations are there?
A)4
B)8
C)16
D)32
Q2) ________ are electric or electromagnetic representations of data.
Q3) Analog encoding of digital information modulates a wave known as the carrier in terms of its phase,frequency or amplitude.
A)True
B)False
Q4) Error detection requires that extra bits be introduced into the data stream.
A)True
B)False
Q5) Each signal change or element is called a:
A)bit
B)byte
C)baud
D)signal
Q6) The mapping from binary digits to signal elements is the ________ scheme.
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Chapter 6: Data Link Control and Multiplexing
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Q1) The two commonly used forms of ARQ are "stop-and-wait" and "go back N".
A)True
B)False
Q2) _________ is possible when the data rate of the transmission medium exceeds the required data rate of signals to be transmitted and a number of digital signals,or analog signals carrying digital data,can be carried simultaneously by interleaving portions of each signal in time.
Q3) A __________ frame is a recognizable frame that arrives,but some of the bits have been altered during transmission.
Q4) Most cordless digital telephone systems used in homes employ ________ or time division duplexing along with FDM.
A)TDMA
B)GSM
C)ITU-T
D)SDH
Q5) To prevent interference,the channels are separated by ________,which are unused portions of the spectrum.
Q6) The set of time slots dedicated to one source,from frame to frame,is called a
Page 8
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Chapter 7: The Internet
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Q1) Commercial use of the Internet was discouraged until approximately 1988.
A)True
B)False
Q2) _______ provides a universal language for remote computer terminals.
Q3) The ________ is a global information system logically linked together by a globally unique address space based on the Internet Protocol or its subsequent extensions / follow-ons.
Q4) Hosts connected to the Internet are identified by a unique 24-bit number that identifies a network and specific host within that network.
A)True
B)False
Q5) If you receive an IP address automatically,the address of the DNS server can be provided at the same time.
A)True
B)False
Q6) The Internet is a central component of most enterprise networks.
A)True
B)False
Q7) The networks connected at an IXP are owned and operated by _________.
Page 9
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Chapter 8: Tcp / Ip
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Q1) Two protocol architectures have served as the basis for the development of interoperable protocol standards: the OSI reference model and the ________.
Q2) Subnetworks are connected by devices referred to as __________,which provide a communications path and perform the necessary relaying and routing functions so that data can be exchanged between devices attached to different subnetworks in the internet.
Q3) ________ is an Internet-based standard and is the framework for developing a complete range of computer communications standards.
Q4) TCP / IP is a protocol architecture.
A)True
B)False
Q5) Transport PDUs are typically called ________.
A)channels
B)segments
C)bridges
D)frames
Q6) A _________ is a facility that provides a data transfer service among devices attached to the network.
Q7) Features of ________ include mailing lists,return receipts,and forwarding.
10
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Chapter 9: Client Server, intranet, and Cloud Computing
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Q1) Advantages of a web / database system as compared to a more traditional database approach include:
A)improved functionality and ease of administration
B)ease of administration and transaction tracking
C)rapid development and flexible information presentation
D)easy deployment and improved functionality
Q2) Intranets are expensive to implement,but inexpensive to maintain.
A)True
B)False
Q3) The client / server architecture is a blend of decentralized and centralized computing.
A)True
B)False
Q4) In a ________ processing configuration,the application processing is performed in an optimized fashion,taking advantage of the strengths of both client and server machines and of the distribution of data.
A)host-based
B)server-based
C)client-based
D)cooperative
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Chapter 10: Internet-Based Applications
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Q1) In general,public and Internet mail systems offer access to a wider range of services and more robust applications.
A)True
B)False
Q2) The ________ service supports the communication of individual pictures,charts,or drawings.
Q3) MIME subtypes of the multi-part type are used to describe how the different parts of a message go together.
A)True
B)False
Q4) When using HTTP,an application program that accepts connections in order to service requests by sending back responses is called a ___________.
A)client
B)server
C)host
D)resource
Q5) The term "multimedia" refers to four distinct types of media: text,graphics,video,and ________.
Q6) A _______ is a network data object or service that can be identified by a URL.
Page 12
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Chapter 11: Internet Operation
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Q1) Both the broadcast and multiple unicast strategies are inefficient because they generate unnecessary copies of the source packet.
A)True
B)False
Q2) To identify a host on the Internet,each host is assigned a unique IP address,which consists of two logical components: a network component and a ________ component.
Q3) _________ is an identifier for a set of interfaces in which a packet is delivered to all interfaces identified by that address.
Q4) In an internet environment,multicasting is an easier undertaking.
A)True
B)False
Q5) The IP address is obtained either by looking it up in a configuration file or dynamically,via the ______________.
Q6) Typically,more complex routing protocols are used between autonomous systems within a larger internet and relatively simple routing protocols are used within each autonomous system.
A)True
B)False
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Chapter 12: Lan Architecture and Infrastructure
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Q1) Cables and associated connecting hardware whose transmission characteristics are specified up to _________ fall into Category 5 UTP cabling.
A)50 MHz
B)100 MHz
C)150 MHz
D)200 MHz
Q2) A factory ________ should be: of high capacity,able to handle a variety of data traffic,capable of having a large geographic footprint,highly reliable,and able to specify and control transmission delays.
Q3) Higher-level data,such as an IP datagram,are passed down to LLC,which appends control information as a header,creating an LLC ___________.
Q4) The capacity of optical fiber cable is more than 1000 times greater than coaxial cables.
A)True
B)False
Q5) Ethernet requires that each segment be no more than ___________ in length, including the installed cabling and patch cables at either end,for 10-Mbps and 100-Mbps transmissions.
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Chapter 13: Ethernet, switches, and Virtual Lans
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Q1) The original commercial Ethernet,as well as the original IEEE 802.3 standard,operated at 100 Mps.
A)True
B)False
Q2) This option supports 1-Gbps links among devices located within a single room or equipment rack,using copper jumpers (specialized STP cable that spans no more than 25 m).Each link is composed of a separate STP running in each direction.
A)1000BASE-SX
B)1000BASE-T
C)1000BASE-LX
D)1000BASE-CX
Q3) On a bus topology LAN,each station can send and receive data to or from another station independent of other bus activity.
A)True
B)False
Q4) The strength of Ethernet lies in its backward compatibility, industry support,and simplicity.
A)True
B)False
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Chapter 14: Wireless Lans
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Q1) When using wireless network,roaming occurs when a mobile stations moves from one access point (or cell)to another.
A)True
B)False
Q2) For privacy ,802.11 defined the __________ algorithm.
Q3) The physical layer for IEEE 802.11 has been issued in _______ stages.
A)3
B)5
C)7
D)9
Q4) A set of one or more interconnected BSSs and integrated LANs that appear as a single BSS to the LLC layer at any station associated with one of these BSSs.
A)MPDU
B)ESS
C)MSDU
D)DS
Q5) Infrared LANs are an economic alternative to spread spectrum LANs. A)True
B)False
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Chapter 15: Wan Technology and Protocol
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Q1) It is desirable to have only one path from sender to receiver to avoid excess costs.
A)True
B)False
Q2) Which of the following is a feature of Wide Area Networks?
A)strategic control
B)reliability
C)security
D)all of the above
Q3) ________ are the means by which the network is managed and by which calls are established,maintained,and terminated.
Q4) Communication via circuit switching involves three phases: circuit establishment,________,and circuit disconnect.
Q5) In circuit switching networks,channel capacity between each pair of stations and / or nodes along the connection path must be reserved regardless if used or not.
A)True
B)False
Q6) ________ signals identify a subscriber.
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Chapter 16: Wan Services
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Q1) Congestion recovery procedures are used to preserve the network during instances of high congestion when the network has begun to drop frames.
A)True
B)False
Q2) Typically initiated when the network has begun to drop frames due to congestion,congestion _________ procedures are used to prevent network collapse in the face of severe congestion.
Q3) X.25 uses out-of-band signaling.
A)True
B)False
Q4) __________ indicates a request that a frame should be discarded instead of other frames in which this bit is not set,when it is necessary to discard frames.
Q5) WAE uses _________ connectivity to deliver high-speed WAN service.
Q6) The _________ field indicates the type of information in the information field.
A)PT
B)VPI
C)GFC
D)CRC
Q7) Most WAE implementations use __________to interconnect network endpoints.
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Chapter 17: Wireless Lans
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Q1) In 4G networks,IP telephony is the norm as are IP packet- switched connections for Internet access.
A)True
B)False
Q2) Each mobile telecommunications switch office is connected to one base station and provides a management interface between that base station and the rest of the network.
A)True
B)False
Q3) Which of the following is NOT one of the ways that frequency spectrum can be divided among active users?
A)frequency division multiple access
B)time division multiple access
C)code division multiple access
D)cell division multiple access
Q4) The idea of universal personal telecommunications refers to the capability of using one's terminal in a wide variety of environments to connect to information services.
A)True
B)False
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Chapter 18: Computer and Network Security Threats
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Q1) Most viruses carry out their work in a manner that is specific to a particular operating system.
A)True
B)False
Q2) Which of the following is a type of scanning strategy?
A)hit list
B)topological
C)local subnet
D)all of the above
Q3) One type of attack on the security of a computer system or network that impacts the availability of a system (e.g.destruction of a resource in the system)is referred to as
A)interruption
B)interception
C)modification
D)all of the above
Q4) A backdoor is the same as a trapdoor.
A)True
B)False
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Chapter 19: Computer and Network Security Techniques
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Q1) The Host-based IDS monitors network traffic for particular network segments or devices and analyzes network,transport, and application protocols to identify suspicious activity.
A)True
B)False
Q2) A security intrusion is defined as a successful attempt by a user to gain access to a system or system resource without proper authorization.
A)True
B)False
Q3) The _________ mechanism assures that a received packet was,in fact,transmitted by the party identified as the source in the packet header
Q4) The Secure Sockets Layer (SSL)and the follow-on Internet standard known as __________ provide a reliable end-to-end secure transport service over TCP.
Q5) The most complex part of SSL is the ___________ Protocol.
A)Handshake
B)Change Cipher Spec
C)Alert
D)Record
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