1.Which layer is responsible for data translating
1.Application
2.Network
3.presentation
4.data link
1.End-to-End connectivity is provided from host to host in
1.network layer
2.session layer
3.data link layer
4.transport layer
In OSI model, which of the following layers transforms information from machine format
into that understandable of user
1.application
2.presentation
3.session
4.physical
Which layer of OSI determines the interface of the system with the user
1.network
2.application
3.data link
4.session
The OSI model consists of _________ layers
1.three
2.five
3.seven
4.eight
The _________ layer divides the location of synchronization points
1.transport
2.session
4.application
The end-to-end delivery of the entire message is the responsibility of the ______ layer
2.transport
The ______ layer is the layer almost to the transmission medium
1.physical
2.data link
3.network
4.transport
In the __________ layer , the data unit is called a frame
Description and encryption of data are the responsibilities of the _______ layers
dialog control is the function of the _____________ layer
mail services and directory services are available to network users through the
_________ layers
1.data link
3.transport
Node-to-Node delivery of the data unit is the responsibility of the _____ layers
4.network
As the data packets move from the lower to the upper layers, headers are
1.added
2.subtracted
3.rearranged
4.modified
The ________ layer lies between the network layer and the session layers
4.presentation
When data are transmitted from device A to device B, the headers from A's layer 5
is read by B's _____________ layers
which topology feature is a point-to-point line configuration
1.mesh
2.ring
3.star
4.all of these
In a _________ link , the only traffic is between the two connected devices
1.secondary
2.primary
3.dedicated
4.none of these
In a network with 25 computers which topology would require the most extensive cabling
2.star
3.bus
4.Ring
With respect to the channel access methods in broadband network, which of the following
statements is in correct
1.token passing is a more fair method than CDMA/CD
2.token passing is stable in binary traffic conditions
3.CSMA /CD is more stable in heavy traffic conditions
4.Adding and removing nodes to CSMA /CD Lan its easier than to token passing LAN
Local area networks can transmit
1.slower than telecommunications over public telephone lines
2.faster than telecommunications over public telephone lines
3.using twisted pair wiring or coaxial cables
4.both (a) and (c)
The application layer of a network
1.establishes , maintains and terminates virtual circuits
2.consists of software being run on the computer connected to the network
3.defines the user's post into the network
4.all of the above
devices on the network can communicate with devices on another network via
1.file server
2.printer server
3.utility server
4.gateway
A distributed network configuration in which all data/ instructions pass through a central
computr is
1.bus network
2.ring network
3.star network
4.point-to-point network
The communication mode that supports two way traffic but only one direction at a time is
1.simplex
2.half duplex
3.duplex
4.multiplex
the central omputer surrounded by one or more satellite computer is called a
4.All of these
FDDI is a
1.ring network
2.star network
3.mesh network
4.bus based network
How many pairs of stations can simulenously communicate on ethernet LAN
1.1
2.3
3.2
the communication mode that supports data in both directions at the same time is
2.half simplex
3.full simplex
modulation is the process of
1.sending a file from one computer to anther computer
2.converting digital sigmals to analog signals
3.converting analog signals to digital signals
4.echoing every character that is received
which layer is international standard organization's OSI model responsible for creating and
recognizing frame boundaries
1.physical layer
2.data link layer
3.transport layer
4.network layer
Why was the OSI developed
1.manufactures disliked the TCP/IP protocol suite
2.The rate of data transfer was increasing exponentially
3.standards were needed to allow any two systems to communicate
4.None of the above
Ip is responsible for ________ communication while TCP is responible for ___________ communication
1.host-to-host, process to process
2.process-to-process, host-to-host
3.process-to-process, process-to-process
4.Node-to-node, node-to-node
In token ring, the token can be removed by
1.the nearest downstream neighbor
2.the receiving station
3.the ring monitor
4.the nearest upstream neighbor
who strips the data frame from the token ring network
1.destination station
2.the first station which wants to transmit next
3.the sending station
4.the station next to the destional station
match list I with List II and select the correct answer using the codes given below the lists
List I List II
P: Data link layer 1.Ensures reliable transport of data over a physical point to point link
Q: Network layer 2.Encodes/Decodes data for physical transmission
R: Transport layer 3.Allows end-to-end communication between two processors
4.routes data from one network to the next
1.p-1 , q-4,r-3
2.p-2,q-3,r-1
3.p-2,q-4,r-1
4.p-1,q-3,r-2
the physical layer is concerned with the transmission of ________ over the physical medium
1.programs
2.dialogs
3.protocols
4.bits
computers in a LAN can be interconnected by radio and infrared technolgies with
1.Wireless LAN
2.Network topologies
3.multiplexers
4.modem
A device that links two homogenious packet-broadcast local network is
1.hub
2.bridge
3.repeater
Distributed queue dual bus is a standard for
1.LAN
2.MAN
3.WAN
4.LAN and MAN
The teleprocessing system may consists of
1.user systems
2.communication systems
3.computer centre systems
4.All of the above
which layer of OSI determines the interface of the system with the user
TCP is
1.operated at the data link layer
2.connection oriented and unreliable
3.connection oriented and reliable
4.connectionless and unreliable
Which of the following statements is correct
1.protocols converters are the same as multiplexers
2.protocol converters are the same as TDMs
3.protocol converters are usually not operated in pairs
4.protocol converters are usually operated in pairs
protocols are
1.agreements on how communication components are DTE's are to communicate
2.logical communication channels used for transferring data
3.physical communications channels used for transferring data
4.none of the above
Which of the following is wrong example of a network layer
1.Internet protocol - (IP - ARPANET
2.x.25 packet level protocol (PLP) - ISO
3.source routing and domain naming USENET
4.x.25 level 2-ISO
HDLC is
1.bit oriented
2.code transparent
3.both (a) and (b)
Baud means
1.the number of bits transmitted per unit time
2.the number of bytes transmitted per unit time
3.the rate at which signal changes
Frame relay requires error checking at the _________ layer
2.network
which of the following layer protocol are responsible for user and the applicaiton programme
support such as passwords , resource sharing file transfer and network management
1.layer 7 protocols
2.layer 6 protocols
3.layer 5 protocols
4.layer 4 protocols
1.aggrements on how communication components and DTE's are to communicate
3.physical communication channels used for transfering data
In broadcast network, a layer that is often thin or non-existent is
2.transport layer
3.prentation layer
4.application layer
For pure ALOHA , the maximum channel utilization is
1.100 %
2.50 %
3.36 %
4.18 %
The network that requires human intervention to route signal is called a
4.T-switched network
Baseband is
1.transmission of signals without modulation
2.a signal all of whose energy is contained within a finite frequency range
3.the simultenous transmission of data to a number of stations
Working of the WAN generally involves
1.satellite
2.frame relay
3.ATM
Which of the following has the smallest default maximum physical receive packet size
1.ARCNET
2.Eithernet
3.Token ring [ 4 mbit/s]
4.token ring [ 16 mbit/s]
The x.25 standard specified a
1.technique for dial access
2.technique for start stop data
3.data bit rate
4.DTE/DCE interface
the frame relay committed information rate represents
1.maximum data rate on the network
2.steady state data on the network
3.minimum data rate on the network
4.interface data rate
ALOHA
1.is used for channel allocation problem
2.is used for data transfer
3.is uded for buffering
pure ALOHA
1.does not require global time synchronization
2.does required global time synchronization
slotted ALOHA
1.divide time into discrete intervals
2.require global time synchronization
CSMA/CD
1.in an important protocol
2.is IEEE 802.3
which of the following is not a class of LAN
1.boradband
2.CSMA/CD
3.token bus
4.token ring
different computers are connected to a LAN by a cable and
1.modem
2.interface card
3.special wires
4.telephone lines
The topology with higest relability is
1.bus topology
2.star topology
3.ring topology
4.mesh topology
In the carrier sense network, if the prevailling condition is a channel busy then
if the technique used is
1.non-persistent, then it results in randomized wait and sense
2.I-persistent, then the channel is continually sensed
3.P-persistent , then randomized retransmission is done
4.both (a) and (b)
In a client / server networking environment the processing
1.takes place only on the client side
2.of requests by the client is handled by the server
3.takes place only on the server side
What is the maximum size of data that the application layer can pass on the TCP layer below
1.any size
2.116 byte
3.2 power 16 byte
4.1500 byre
the parameter which gives the probability of the transport layer itself spontaneously
terminating a connection due to internal problem is called
1.protection
2.resilience
3.option negotiation
4.transfer failure
The division of a message into segments is a function of the
Which layer deals with file system, transfer, vertical terminates implementation and interprocess
communication
In token ring, the tokens can be removed by
1.the nearest down stream neighvour
4.the nearest upstream neighbour
who strips the data frame the token ring network
3.The sending station
4.The station next to the destination station
The data communication support should include but is not restricted to
1.file and data base access
2.file transfer and transaction processing
3.terminal support electronic mail and voice grames
A decrease in a magnitude of current, voltage, a power of a signal in transmission between paints, is known as
1.attenuation
2.ALOHA
3.amplitude
4.carrier
x.25 is
1.a method of determining which device access to the transmission medium at any time
2.a very common bit-oriented data link protocol issued by ISO
3.a method access control technique for multiple access transmission media
4.network access standard for connecting stations to a circuit switched network
which of the following network access standard is used for connecting stations to a packet switched network
1.x.3
2.x.21
3.x.25
4.x.75
Which of the commonly used unit for measuring the speed of data transmission
1.bit per second
2.baud
3.byte per second
4.Either b or c
which of the following might be used by company to satisfy its growing communication speeds
1.from end processor
2.controller
3.multiplexer
4.concentration
A distributed data processing configuration in which all activities must pass
through a centrally located computer is called a
1.hierarchical network
2.spider network
3.ring network
4.data control network
A communication device that combines transmission from several I/O devices into
one line is a
1.modifier
2.concentrator
4.full duplex line
to make possible the efficient online servicing of many teleprocessing systems users on
large computer systems , designers are developing
1.multiprogramming systems
3.virtual storage systems
which of the following is not a major capability of information systems
1.provide high speed low volume numerical computation
2.store huge amounts of information
3.allpw fast access to informations
4.enable communication and collabration any where any time
which type of network covers a limited geographic distance such as an office building or a group of
building in close proximatly to each other
All of the following are types of PDA's except
1.palms
2.handsprinting
3.pocket pcs
4.pocket palms
which of the following can be shared in a peer-to-peer network
1.information
2.software
3.hardware devices
A computer network is two or more connected computers that share
3.pheripheral devices
the speed of a DSL line varies based on which of the following factors
1.cpu speed
2.type of connection used
3.distance from phone company
4.number of users online
which of the following is not an advantage of DLS
1.always on
2.faster than telephone modem
3.constant speed
4.can talk and be online at the same time
Hand -held wireless devices such as TDAs may be used to access the internet over
wireless networks which of the following operating systems are not used in these devices
1.windows xp
2.packet pc
3.palm
4.window CE
which network consists of one or more computers providing services to other computers
1.peer-to-peer
2.wireless
3.internet
4.client/server
which of the following describes a set of rules used by every computer to
transfer information
1.communication protocol
2.communication method
3.network software
4.satellite modem
A local area network using wireless technology is termed a
1.WLAN
2.Wireless local area network
3.LAWN
which of the following is measured in kbps , mbps and gbps
1.memory capacity
2.network transmission speed limits
3.PDA speed
4.bandwidth
which of the following networks uses software to establish a secure channel on the iternet
for transmitting data
1.wireless network
2.secure public network
3.virtual public network
4.virtual private network
All of the following are basic principle of networks, except
1.only one computer must have a network card
2.there must be communications media connecting the network hardware devices
3.several computer must have a network card
A(n) _____ consists of two or more computers connected so that they can communicate with each other
and shared information software, pheripheral devices and or processing power
1.computer network
2.distributed system
3.operating system
A(n)_______ is a network in which a small number of computers share hardware , software
and/or information
1.Half duplex network
2.multipoint network
3.peer-to-peer network
________ is a high speed interval connection , using phone lines which allows you to
use yout phone for voice communication of the same time
1.Data subscriber line
2.digitial subscriber line
3.digital switching line
4.3000 bit/s
The physical layer in the reference to the OSI model defines
1.data link procedures that provide for the exchange of data via frames that can be sent and received
2.the interface between x.25 network and packet node device
3.the virtual interface to packet switched services
which out the following is not the principle of ISDN
1.support of voice and non-voice application
2.support of switched and non-switched applications
3.Intelligence in the network
4.limited configuration
layered protocols which of the offer following advantages
1.It breaks the design problem into more manageable and smaller pieces
2.It allows protects to be changed without affecting higher or lower ones
which data communication method is used to send data over a serial communication line
2.full duplex
3.half duplex
what is the main difference between synchronus and asynchronus transmission
1.the bandwidth required is different
2.the pulse height is different
3.the clocking is derived from the data in synchronous transmission
4.the clocking is mixed with the data in synchronus transmission
The transfer of data from a CPU to pheripheral devices of a computer is achieved through
1.computer parts
2.nodems
3.interfaces
4.buffer memory
In asynchronous transmission receiver
1.In asynchronous transmission receiver
2.know when a data unit is sent
3.does not recognize begining and end of data unit
Which of the following are sub layers of data link layer
1.logical link control, data link control
2.data link cotrol, logical link control
3.physical layer control, data line control
4.media access control, logical link control
Interoperability is the function of
2.presentation layer
maximum data rate of channel of 3000 Hz bandwidth and S/N ratio of 30 DB is
1.30000 bit/s
2.60000 bit/s
3.75000 bits/s
A voice grade telephone line carries a continuous electromagnetic signals ranging between 3300 Hz
what is the channel capacity if the signal to raise ratio is 30 dB
1. 29.02 kbit/s
2. 29.9 kbit/s
3. 28.6 kbit/s
4. 30.13 kbit/s
what is a MAC
1.It is the network layer address, of a NIC , that can not be modified
2.It is the network layer address of a NIC that can be modified
3.It is the data link layer address of a NIC that can not be modified
4.It is the data link layer address of a NIC, that can be modified
which of the following are the tasks performed by data link layer
1.Frame synchronization
2.flow control
3.Error control
The _________ resources the number of lost or garbled messages as a fraction of the total
set in the sampling period
1.residual error rate
2.transfer failure probability
3.connection release failure probability
4.connection establishment failure probability
The file transfer protocol (FTP) requires a reliable transport service. which protocol
of the TCP/IP suite does it use
1.tranmission control protocol
2.UDP
3.telnet
which of the following statemtents are correct
1.TCP is connection oriented and UDP is connectionless
2.UDP is connection oriented and TCP is connectionless
3.Both TCP and UDP are connection oriented
4.Both TCP and UDP are connectionless
Both TCP and UDP are connectionless, which of the following is a characteristic of a LAN
1.parallel transmission
2.unlimited expansion
3.low cost access for low bandwidth elements
4.application independent interfaces
which of the following is possible in a token passsing bus network
1.unlimited number of stations
2.unlimited distance
3.In service expansion
4.multiple time division channels
A voice / data multiplexer will not flow control
1.voice
2.data
3.time slots
4.odd channels
An example of an analog communication method is
1.laser beam
2.micro waves
3.voice grade telephone line
4.all of above
If communication software can be called traffic cap of a micro communication system,
then what sould the modem be called
1.park
3.interface
4.link
The linking of computers with a communication system is called
1.networking
2.pairing
3.interfacing
4.assembling
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