A The Internet Layer B The Transport Layer C Both A and B D Neither A nor B Answer: B Diff: 3 Page Ref: 31 12 ________ the physical arrangement of a network's computers, switches, router
Trang 1Business Driven Data Communications (Gendron)
Chapter 1 ICT Introductory Concepts
1.1 Multiple Choice Questions
1) 42.18.248 is an address
A) IP
B) ethernet
C) Either A or B
D) Neither A nor B
Answer: A
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2) When a fluorescent light interferes with UTP transmission, this is
A) terminal crosstalk interference
B) EMI
C) crosstalk interference
D) All of the above
Answer: B
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3) Internet infrastructure standards are created by the
A) Internet Association
B) OSI
C) ISO
D) IETF
Answer: D
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4) In optical fiber, light travels through the
A) cladding
B) core
C) buffer
D) None of the above
Answer: B
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5) The protocol provides an encrypted connection to a remote computer that typically allows login and commands to be executed on the remote computer
A) DNS
B) DHCP
C) SSL
D) SSH
Answer: D
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Trang 26) Today, the main benefit of optical fiber compared to UTP is .
A) the ability to transmit signals faster
B) lower cost
C) the ability to span greater distances
D) durability
Answer: C
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7) In the UTP wiring used in LANs, how many wire pairs are there in a cord?
A) 1
B) 2
C) 4
D) 8
Answer: C
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8) When one pair in a UTP cord interferes with signals in other pairs, this is
A) EMI
B) crosstalk interference
C) internal noise
D) Both A and B
Answer: D
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9) In an internet, different individual networks are connected by
A) trunk lines
B) carrier switches
C) routers
D) All of the above
Answer: D
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10) Routers make packet forwarding decisions based on a packet's
A) destination IP address
B) source IP address
C) Both A and B
D) Neither A nor B
Answer: A
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Trang 311) Which layer in the TCP/IP-OSI hybrid architecture governs end-to-end transmission between two hosts across an internet?
A) The Internet Layer
B) The Transport Layer
C) Both A and B
D) Neither A nor B
Answer: B
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12) the physical arrangement of a network's computers, switches, routers, and
transmission links
A) Physical Layer standards are
B) Network architecture is
C) Network layout is
D) Network typology is
Answer: D
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13) Which of the following is reliable?
A) UDP
B) TCP
C) Both A and B
D) Neither A nor B
Answer: B
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14) In LANs, optical fiber is typically used in
A) access lines
B) trunk lines
C) Both A and B
D) None of the above
Answer: B
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15) A noise spike is
A) the maximum noise energy
B) a large brief increase in the noise energy
C) the average noise energy
D) the minimum noise energy
Answer: B
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Trang 416) Which of the following is connectionless?
A) TCP
B) IP
C) Both A and B
D) None of the above
Answer: B
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17) Routers are usually connected in a typology
A) point-to-point
B) mesh
C) star
D) ring
Answer: B
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18) operates at the Internet Layer
A) TCP
B) IP
C) Both A and B
D) Neither A nor B
Answer: B
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19) A(n) specifies a particular application on a particular host
A) port number
B) IP address
C) socket
D) None of the above
Answer: C
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20) T-1 leased lines run at a speed of about
A) 10 kbps
B) 50 kbps
C) 750 kbps
D) 1.5 Mbps
Answer: D
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Trang 521) Because of greater distances, WAN transmission speeds are LAN transmission speeds
A) faster than
B) about the same as
C) slower than
D) much faster than
Answer: C
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22) UDP
A) is unreliable
B) performs error checking, but not error correction
C) Both A and B
D) Neither A nor B
Answer: C
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23) A POP is
A) a publicly owned telephone company
B) a sudden electrical noise in a telephone circuit
C) a jump in a hop-by-hop transmission
D) a place where telephone carriers interconnect
Answer: D
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24) A connection is a point-to-point typology that allows two hosts or devices to communicate through a circuit that interconnects the devices
A) modem
B) codec
C) bandpass filter
D) All of the above
Answer: A
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25) The dominant scheme for encoding data by a computer is
A) ISO 8858-1
B) JCT1
C) Unicode
D) None of the above
Answer: C
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Trang 626) Analog data include .
A) sound
B) temperature
C) time
D) All of the above
Answer: D
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27) Bits are commonly grouped into sets of bytes, called
A) 4, quartets
B) 6, sextets
C) 8, octets
D) None of the above
Answer: C
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28) is a special case of EMI in which conductors in a cable interfere with each other A) Attenuation
B) Noise
C) Crosstalk
D) Signal-to-noise
Answer: C
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29) As signals propagate they become weaker due to which propagation effect?
A) EMI
B) Crosstalk
C) Attenuation
D) Signal-to-noise
Answer: C
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30) A signal transmitted one bit at a time is known as communication
A) serial
B) parallel
C) full-duplex
D) half-duplex
Answer: A
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31) allows communication simultaneously between two hosts
A) Serial
B) Parallel
C) Full-duplex
D) Half-duplex
Answer: C
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32) A(n) can be used to synchronize a receiver to an incoming data stream
Trang 7A) sync word
B) bit
C) octet
D) None of the above
Answer: A
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33) The process by which digital data are converted to sound is known as
A) multiplexing
B) modulation
C) demodulation
D) Both A and B
Answer: B
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34) A is an example of a modulator
A) modem
B) router
C) switch
D) None of the above
Answer: A
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35) Telecommunications is measured in per second and in multiples of A) Mbps, 1000
B) bits, 1000
C) bits, 1024
D) Mbps, 1024
Answer: B
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36) T-3 carrier circuits offer speeds of about
A) 1544 kbps
B) 10 Mbps
C) 43000 kbps
D) 104 Mbps
Answer: C
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37) T-1, T-3, and DSL are all examples of
A) internet service providers
B) frequency ranges
C) carrier circuits
D) None of the above
Answer: C
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38) By following standards and protocols when manufacturing hardware, vendors ensure of their products
Trang 8A) interoperability
B) low cost
C) ease of use
D) interconnectedness
Answer: A
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39) The portion of the hybrid architecture involves Layers 1 and 2, while the
portion deals with Layers 3 through 5
A) TCP/IP, OSI
B) OSI, TCP/IP
C) TCP, IP
D) None of the above
Answer: B
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40) The mandate that electronic equipment may not emanate more than a specified level of radio interference
A) IEEE
B) ISOC
C) ITU-T
D) FCC
Answer: D
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41) is the correct order for the geographic scope of computer networks from smallest
to largest
A) WAN, MAN, LAN
B) LAN, MAN, WAN
C) LAN, WAN, MAN
D) MAN, WAN, LAN
Answer: C
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42) The ISO committee that governs information technology that are applied to Layers 1 and 2 of the hybrid TCP/IP-OSI architecture is the
A) ITU-T
B) JCT1
C) ATM
D) IEEE
Answer: B
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Trang 943) are examples of Layer 5 devices, while are examples of Layer 2
devices
A) Hosts, hubs
B) Hubs, switches
C) Routers, hosts
D) Hosts, switches
Answer: D
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44) A network where all hosts are attached to one common media that allows communication among the hosts is known as a typology
A) point-to-point
B) bus
C) star
D) mesh
Answer: B
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45) A network typology is one that uses a series of interconnecting routers that creates multiple pathways between points on a network
A) star
B) ring
C) mesh
D) point-to-point
Answer: C
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46) The network typology is the most common LAN typology in which hosts are interconnected through a series of hubs and switches
A) bus
B) star
C) point-to-point
D) mesh
Answer: B
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47) The worldwide phone system is based on switching, where an electrical circuit is created each time data are sent
A) packet
B) circuit
C) Both A and B
D) Neither A nor B
Answer: B
Diff: 1 Page Ref: 27
Trang 1048) In the worldwide phone system, the media between the customer premises and the local switch is called the , while a carrier circuit that interconnects switches is called a
A) local loop, trunk line
B) trunk line, local loop
C) trunk, loop line
D) loop line, trunk
Answer: A
Diff: 2 Page Ref: 28
49) A is any 5 layer telecommunication device capable of propagating data
A) router
B) hub
C) host
D) switch
Answer: C
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50) The process of converting human-friendly names into numeric addresses is known as
A) addressing
B) encapsulation
C) decapsulation
D) name resolution
Answer: D
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51) The process of putting a message inside of another message so it can be transmitted is called
A) transport
B) decapsulation
C) TCP
D) None of the above
Answer: D
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52) ports are in the range of 49152-65535 and are randomly chosen by a host as source ports
A) Registered
B) Well-known
C) Ephemeral
D) Transport
Answer: C
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Trang 1153) IP_ADDRESS:PORT_NUMBER represents a .
A) transport port
B) PDU
C) socket
D) None of the above
Answer: C
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54) Network Layers are needed to carry a message across the Internet
A) Within
B) Among
C) Between
D) End-to-End
Answer: C
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55) In order to get a message from a sending host to a receiving host, layers of the TCP/IP-OSI architecture are needed
A) 2
B) 3
C) 4
D) 5
Answer: D
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56) The Data Link Layer is layer number
A) 4
B) 2
C) 3
D) 5
Answer: B
Diff: 1 Page Ref: 37
57) The Layer is responsible for signaling
A) Application
B) Internet
C) Physical
D) Data Link
Answer: C
Diff: 2 Page Ref: 37
Trang 1258) The Layer is responsible for between-network routing.
A) Application
B) Internet
C) Physical
D) Data Link
Answer: B
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59) is a WAN technology used to interconnect LANs
A) Point-to-Point
B) Fiber Distributed Data Interface
C) Frame Relay
D) TCP
Answer: C
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60) The purpose of DHCP is to:
A) provide an encrypted connection to a remote computer
B) provide secure communications for Internet communication
C) allow a local client to access e-mail on a remote server
D) assign an IP address and other identifiers to a host
Answer: D
Diff: 2 Page Ref: 31
1.2 True/False Questions
1) Hardware network addresses are called MAC addresses
Answer: TRUE
Diff: 1 Page Ref: 32
2) A protocol detects errors but it does not correct them It is reliable
Answer: FALSE
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3) Transmission speed normally is measured in bits per second
Answer: TRUE
Diff: 1 Page Ref: 15
4) Application Layer standards govern how two applications work with each other, even if they are from different vendors
Answer: TRUE
Diff: 2 Page Ref: 30
5) For their transmission medium, cable television companies primarily use coaxial cable to the premise
Answer: TRUE
Diff: 1 Page Ref: 33
Trang 136) ICT infrastructure includes components directly accessed by the user and the back office components that provide network services and network connectivity
Answer: TRUE
Diff: 2 Page Ref: 1
7) Technology infrastructure affects both internal operations and external interactions with suppliers, distributors, and customers
Answer: TRUE
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8) A LAN is generally used when a business wants to communicate from one building to another when those buildings are separated by a large distance
Answer: FALSE
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9) Switches are Layer 3 devices that allow communication with a LAN
Answer: FALSE
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10) The PDU at Layer 4 is known as a TCP Segment or UDP Datagram.
Answer: TRUE
Diff: 1 Page Ref: 37
1.3 Essay Questions
1) Explain the differences between digital and analog data, including why they are important and how they are represented
Answer: Analog data are also known as "continuous data" and include metrics such as sound, temperature, time, and weight These data are continuous because all numbers, including
fractions, are included Digital data are a representation of real-world analog data and are needed for a computer to manipulate, store, and transmit that information In order to convert analog data into digital data, the data is coded as a number of bits The bits are commonly grouped into sets of 8 bytes, called octets, which are the basis of digital character representation
Diff: 2 Page Ref: 6,7
Trang 142) Define interoperability and discuss how it is important for vendors and customers.
Answer: The key to making ICT hardware work is interoperability Interoperability means that vendors must build hardware that seamlessly works together by following guidelines, called standards, which dictate how their hardware must operate The vendor is responsible for the design and manufacture of its equipment, but in order to be interoperable it must operate the same as any other hardware that follows the same standards Hardware may have differences, such as the size and shape of their components, or the inclusion of vendor-specific options, but in order to interoperate, they must adhere to a governing set of standards When ICT is built in accordance with existing standards, competition is affected Standards create a marketplace for hardware and software because multiple vendors offer solutions that do the same or similar functions These standards force vendors to compete on price, availability of options, and other features In this competitive market, vendors have an incentive to innovate their products and compete on price This competitive marketplace is good for consumers because it can motivate vendors to create innovative products as well as cause more attractive pricing
Diff: 3 Page Ref: 19
3) Describe half- and full-duplex transmission and how they differ
Answer: When two telecommunication devices communicate, it is possible to transmit in either full or half duplex Both half- and full-duplex communications allow for communication in both directions The difference is whether you can transmit in both directions simultaneously, or if you can only transmit in one direction at a time In half-duplex communication, only one party can be transmitting at a time, while in full-duplex communication both parties can transmit
simultaneously
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