Data Communication and Networking

DUiit
Data Communication and Networking
Book: Data Communication and Networking
By- Forouzan


 

kkkk
Md. Abdullah Al Kamal
MIT, PGDIT IIT, University of Dhaka

 


1. CORRECT The _______ is the physical path over which a message travels.

A) Protocol
B) Medium
C) Signal
D) All the above


2. The information to be communicated in a data communications system is the _______.

A) Medium
B) Protocol
C) Message
D) Transmission


3. Frequency of failure and network recovery time after a failure are measures of the _______ of a network.

A) Performance
B) Reliability
C) Security
D) Feasibility


4. An unauthorized user is a network _______ issue.

A) Performance
B) Reliability
C) Security
D) All the above


5 Which topology requires a central controller or hub?

A) Mesh
B) Star
C) Bus
D) Ring


6 Which topology requires a multipoint connection?

A) Mesh
B) Star
C) Bus
D) Ring


7 Communication between a computer and a keyboard involves ______________ transmission.

A) simplex
B) half-duplex
C) full-duplex
D) automatic


8 CORRECT A television broadcast is an example of _______ transmission.

A) simplex
B) half-duplex
C) full-duplex
D) automatic


9 A _______ connection provides a dedicated link between two devices.

A) point-to-point
B) multipoint
C) primary
D) secondary


10 In a _______ connection, more than two devices can share a single link.

A) point-to-point
B) multipoint
C) primary
D) secondary


11 In _______ transmission, the channel capacity is shared by both communicating devices at all times.

A) simplex
B) half-duplex
C) full-duplex
D) half-simplex


12 In the original ARPANET, _______ were directly connected together.

A) IMPs
B) host computers
C) networks
D) routers


13 This was the first network.

A) CSNET
B) NSFNET
C) ANSNET
D) ARPANET


14 Which organization has authority over interstate and international commerce in the communications field?

A) ITU-T
B) IEEE
C) FCC
D) ISOC


15 _______ are special-interest groups that quickly test, evaluate, and standardize new technologies.

A) Forums
B) Regulatory agencies
C) Standards organizations
D) All of the above


16 Which agency developed standards for physical connection interfaces and electronic signaling specifications?

A) EIA
B) ITU-T
C) ANSI
D) ISO


17  _______ is the protocol suite for the current Internet.

A) TCP/IP
B) NCP
C) UNIX
D) ACM


18 _______ refers to the structure or format of the data, meaning the order in which they are presented.

A) Semantics
B) Syntax
C) Timing
D) All of the above


19 ________ defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation.

A) Semantics
B) Syntax
C) Timing
D) None of the above


20 _______ refers to two characteristics: when data should be sent and how fast it can be sent.

A) Semantics
B) Syntax
C) Timing
D) none of the above


21 Data flow between two devices can occur in a _______ way.

A) simplex
B) half-duplex
C) full-duplex
D) all of the above


22 In a ______ connection, two and only two devices are connected by a dedicated link.

A) multipoint
B) point-to-point
C) (a) and (b)
D) none of the above


23 In a ________ connection, three or more devices share a link.

A) multipoint
B) point-to-point
C) (a) and (b)
D) none of the above


24 ______ refers to the physical or logical arrangement of a network.

A) Data flow
B) Mode of operation
C) Topology
D) None of the above


25 Devices may be arranged in a _____ topology.

A) mesh
B) ring
C) bus
D) all of the above


26 A _______ is a data communication system within a building, plant, or campus, or between nearby buildings.

A) MAN
B) LAN
C) WAN
D) none of the above


27 A ______ is a data communication system spanning states, countries, or the whole world.

A) MAN
B) LAN
C) WAN
D) none of the above


28 ________ is a collection of many separate networks.

A) A WAN
B) An internet
C) a LAN
D) None of the above


29 There are ______________ Internet service providers.

A) local
B) regional
C) national and international
D) all of the above


30 CORRECT A ________ is a set of rules that governs data communication.

A) forum
B) protocol
C) standard
D) none of the above


31 CORRECT ________ is an idea or concept that is a precursor to an Internet standard.

A) RCF
B) RFC
C) ID
D) none of the above


kkkk_______________________________________
Practice:02
________________________________________


1 The Internet model consists of _______ layers.

A) Three
B) Five
C) Seven
D) Eight


2 The process-to-process delivery of the entire message is the responsibility of the _______ layer.

A) Network
B) Transport
C) Application
D) Physical


3 The _______ layer is the layer closest to the transmission medium.

A) Physical
B) Data link
C) Network
D) Transport


4 Mail services are available to network users through the _______ layer.

A) Data link
B) Physical
C) Transport
D) Application


5 As the data packet moves from the upper to the lower layers, headers are _______.

A) Added
B) Removed
C) Rearranged
D) Modified


6 The _______ layer lies between the network layer and the application layer.

A) Physical
B) Data link
C) Transport
D) None of the above


7 Layer 2 lies between the physical layer and the _______ layer.

A) Network
B) Data link
C) Transport
D) None of the above


8 When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s _______ layer.

A) Physical
B) Transport
C) Application
D) None of the above


9 The _______ layer changes bits into electromagnetic signals.

A) Physical
B) Data link
C) Transport
D) None of the above


10 Which of the following is an application layer service?

A) Remote log-in
B) File transfer and access
C) Mail service
D) All the above


11 Why was the OSI model developed?

A) Manufacturers disliked the TCP/IP protocol suite.
B) The rate of data transfer was increasing exponentially
C) Standards were needed to allow any two systems to communicate
D) None of the above


12 The _______ model shows how the network functions of a computer ought to be organized.

A) CCITT
B) OSI
C) ISO
D) ANSI


13 The physical layer is concerned with the movement of _______ over the physical medium.

A) programs
B) dialogs
C) protocols
D) bits


14 The OSI model consists of _______ layers.

A) three
B) five
C) seven
D) eight


15  In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______.

A) added
B) removed
C) rearranged
D) modified


16 In the OSI model, when data is transmitted from device A to device B, the header from A’s layer 5 is read by B’s _______ layer.

A) physical
B) transport
C) session
D) presentation


17 In the OSI model, what is the main function of the transport layer?

A) node-to-node delivery
B) process-to-process message delivery
C) synchronization
D) updating and maintenance of routing tables


18 In the OSI model, encryption and decryption are functions of the ________ layer.

A) transport
B) session
C) presentation
D) application


19 When a host on network A sends a message to a host on network B, which address does the router look at?

A) port
B) logical
C) physical
D) none of the above


20 To deliver a message to the correct application program running on a host, the _______ address must be consulted.

A) port
B) IP
C) physical
D) none of the above


21 CORRECT IPv6 has _______ -bit addresses.

A) 32
B) 64
C) 128
D) variable


22 ICMPv6 includes _______.

A) IGMP
B) ARP
C) RARP
D) a and b


23 The ______ layer is responsible for moving frames from one hop (node) to the next.

A) physical
B) data link
C) transport
D) none of the above


24 The ______ layer adds a header to the packet coming from the upper layer that includes the logical addresses of the sender and receiver.

A) physical
B) data link
C) network
D) none of the above


25 The_________ layer is responsible for the delivery of a message from one process to another.

A) physical
B) transport
C) network
D) none of the above


26 The Internetworking Protocol (IP) is a ________ protocol.

A) reliable
B) connection-oriented
C) both a and b
D) none of the above


27 _______ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer.

A) TCP
B) UDP
C) IP
D) none of the above


28 __________ provides full transport layer services to applications.

A) TCP
B) UDP
C) ARP
D) none of the above


29 The ________ address, also known as the link address, is the address of a node as defined by its LAN or WAN.

A) port
B) physical
C) logical
D) none of the above


30 Ethernet uses a ______ physical address that is imprinted on the network interface card (NIC).

A) 32-bit
B) 64-bit
C) 6-byte
D) none of the above


31 A port address in TCP/IP is ______ bits long.

A) 32
B) 48
C) 16
D) none of the above


32 The ____ created a model called the Open Systems Interconnection, which allows diverse systems to communicate.

A) OSI
B) ISO
C) IEEE
D) none of the above


33 The seven-layer _____ model provides guidelines for the development of universally compatible networking protocols.

A) OSI
B) ISO
C) IEEE
D) none of the above


34 The physical, data link, and network layers are the ______ support layers.

A) user
B) network
C) both (a) and (b)
D) neither (a) nor (b)


35 The session, presentation, and application layers are the ____ support layers.

A) user
B) network
C) both (a) and (b)
D) neither (a) nor (b)


36 The _______ layer links the network support layers and the user support layers.

A) transport
B) network
C) data link
D) session


37 The _______ layer coordinates the functions required to transmit a bit stream over a physical medium.

A) transport
B) network
C) data link
D) physical


38 The _______ layer is responsible for delivering data units from one station to the next without errors.

A) transport
B) network
C) data link
D) physical


39 The ______ layer is responsible for the source-to-destination delivery of a packet across multiple network links.

A) transport
B) network
C) data link
D) physical


40 The ________ layer is responsible for the process-to-process delivery of the entire message.

A) transport
B) network
C) data link
D) physical


41 The ______ layer establishes, maintains, and synchronizes the interactions between communicating devices.

A) transport
B) network
C) session
D) physical


42 The _______ layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format.

A) transport
B) network
C) data link
D) presentation


43 The _________ layer enables the users to access the network.

A) transport
B) application
C) data link
D) physical


44 TCP/IP is a ______ hierarchical protocol suite developed ____ the OSI model.

A) seven-layer; before
B) five-layer; before
C) six-layer; before
D) five-layer; after


45 The TCP/IP _______ layer is equivalent to the combined session, presentation, and application layers of the OSI model.

A) application
B) network
C) data link
D) physical


46 The ________ address, also known as the link address, is the address of a node as defined by its LAN or WAN.

A) physical
B) IP
C) port
D) specific


47 The ____ address uniquely defines a host on the Internet.

A) physical
B) IP
C) port
D) specific


48 The_____ address identifies a process on a host.

A) physical
B) IP
C) port
D) specific


kkkk_______________________________________
Practice:03
________________________________________


1 Transmission media are usually categorized as _______.

A) fixed or unfixed
B) guided or unguided
C) determinate or indeterminate
D) metallic or nonmetallic


2 Transmission media lie below the _______ layer.

A) physical
B) network
C) transport
D) application


3 _______ cable consists of an inner copper core and a second conducting outer sheath.

A) Twisted-pair
B) Coaxial
C) Fiber-optic
D) Shielded twisted-pair


4  In fiber optics, the signal is _______ waves.

A) light
B) radio
C) infrared
D) very low-frequency


5 Which of the following primarily uses guided media?

A) cellular telephone system
B) local telephone system
C) satellite communications
D) radio broadcasting


6 Which of the following is not a guided medium?

A) twisted-pair cable
B) coaxial cable
C) fiber-optic cable
D) atmosphere


7 What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?

A) inner conductor
B) diameter of cable
C) outer conductor
D) insulating material


8 In an optical fiber, the inner core is _______ the cladding.

A) denser than
B) less dense than
C) the same density as
D) another name for


9 The inner core of an optical fiber is _______ in composition.

A) glass or plastic
B) copper
C) bimetallic
D) liquid


10 When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.

A) reflection
B) refraction
C) incidence
D) criticism


11 When the angle of incidence is _______ the critical angle, the light beam bends along the interface.

A) more than
B) less than
C) equal to
D) none of the above


12 Signals with a frequency below 2 MHz use _______ propagation.

A) ground
B) sky
C) line-of-sight
D) none of the above


13 Signals with a frequency between 2 MHz and 30 MHz use ______ propagation.

A) ground
B) sky
C) line-of-sight
D) none of the above


14 Signals with a frequency above 30 MHz use _______propagation.

A) ground
B) sky
C) line-of-sight
D) none of the above


15 A parabolic dish antenna is a(n) _______ antenna.

A) omnidirectional
B) bidirectional
C) unidirectional
D) horn


16 A(n) _____ medium provides a physical conduit from one device to another.

A) guided
B) unguided
C) either (a) or (b)
D) none of the above


17 ________ cable consists of two insulated copper wires twisted together.

A) Coaxial
B) Fiber-optic
C) Twisted-pair
D) none of the above


18 _______ cable is used for voice and data communications.

A) Coaxial
B) Fiber-optic
C) Twisted-pair
D) none of the above


19 __________ consists of a central conductor and a shield.

A) Coaxial
B) Fiber-optic
C) Twisted-pair
D) none of the above


20 _____ cable can carry signals of higher frequency ranges than _____ cable.

A) Twisted-pair; fiber-optic
B) Coaxial; fiber-optic
C) Coaxial; twisted-pair
D) none of the above


21 ______ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.

A) Coaxial
B) Fiber-optic
C) Twisted-pair
D) none of the above


22 ______ cables carry data signals in the form of light.

A) Coaxial
B) Fiber-optic
C) Twisted-pair
D) none of the above


23 In a fiber-optic cable, the signal is propagated along the inner core by _______.

A) reflection
B) refraction
C) modulation
D) none of the above


24 _________ media transport electromagnetic waves without the use of a physical conductor.

A) Guided
B) Unguided
C) Either (a) or (b)
D) None of the above


25 Radio waves are _________.

A) omnidirectional
B) unidirectional
C) bidirectional
D) none of the above


26 Microwaves are _________.

A) omnidirectional
B) unidirectional
C) bidirectional
D) none of the above


27 _______ are used for cellular phone, satellite, and wireless LAN communications.

A) Radio waves
B) Microwaves
C) Infrared waves
D) none of the above


28 ________ are used for short-range communications such as those between a PC and a peripheral device.

A) Radio waves
B) Microwaves
C) Infrared waves
D) none of the above


copy righy @ Md. Abdullah Al Kamal
MIT
, PGDIT, IIT, IT, BSC (CSE), DU, University of Dhaka, BUET
CCIE (R&S), CCNP, CCNA-Security, CCNA-Voice, CCNA (R&S), CCNA Vendor

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