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WorksheetsĐề Thi Cuối Kỳ I Mạng Máy Tính
Total questions: 94
Worksheet time: 47mins
Computer network is ___________________.
Collection of hardware components and computers.
Interconnected by communication channels.
Sharing of resources and information.
All of the mentioned answers.
Which of the following networks is considered as the first computer network?
ARPANET.
CNNET.
NSFNET.
ASAPNET.
How many layers does OSI Model have?
4.
5.
6.
7.
Which layers of the OSI model are host-to-host layers?
Transport, Session, Presentation, Application.
Network, Transport, Session, Presentation.
Datalink, Network, Transport, Session.
Physical, Datalink, Network, Transport.
How many layers are in the TCP/IP model?
4 layers.
5 layers.
6 layers.
7 layers.
A computer network operating spanning states, countries, or the whole world is ____________________.
PAN.
LAN.
MAN.
WAN.
A computer network operating within a building or campus is _________.
PAN.
LAN.
MAN.
WAN.
Which layer in the OSI model is concerned with the syntax and semantics of the information transmitted?
Application.
Presentation.
Session.
Transport.
Which layer in the OSI model determines how packets are routed from source to destination?
Application.
Presentation.
Transport.
Network.
Which layers of the OSI model are operating as same function as the Application layer of the TCP/IP model?
Transport, Session, Application.
Network, Transport, Presentation.
Network, Transport, Session.
Session, Presentation, Application.
Which layer of OSI model provides inter network connectivity?
Physical.
Data Link.
Network.
Transport.
Which of the followings is a function of the Data link layer?
Defines the electrical characteristics of signals passed between the computer and communication devices.
Provides error detection and correction.
Select path for transferring data.
None of the mentioned.
Which of the followings is the correct arrangement of data units of the OSI model based on top-down approach?
Data, Frame, Packet, Segment, Bit.
Data, Packet, Segment, Frame, Bit.
Data, Segment, Packet, Frame, Bit.
Data, Segment, Frame, Packet, Bit.
Which of the following types of networks are classified by scale?
Peer – to – Peer, Client – Server.
Circuit Switching.
PAN, LAN, MAN, WAN.
Wired, Wireless.
Which of the following types of networks are classified by function?
Peer – to – Peer, Client – Server.
Packet Switching.
PAN, LAN, MAN, WAN.
Wired, Wireless.
A ________________ communication network takes messages from a single sender and transmits to all endpoints on the network.
Point – to – Point.
Broadcast.
Multicast.
None of the mentioned.
A _________________ is a set of established rules that dictates how to format, transmit and receive data.
Host.
Protocol.
Application.
Server.
What is the commonly used unit for measuring the speed of data transmission?
Byte.
Bit per second.
Nano second.
Mega Hertz.
_________________ is inflexible once a path is established for transmission, it doesn’t change during the duration of a session.
Circuit Switching.
Packet Switching.
Broadcast.
None of the mentioned.
________________ is flexible as each packet may travel through a different route to reach its destination.
Circuit Switching.
Packet Switching.
Peer-to-peer.
None of the mentioned.
Which layer of the OSI model does a Hub work in?
Physical layer.
Data link layer.
Network layer.
Transport layer.
Which layer of the OSI model does a Switch work in?
Physical layer.
Data link layer.
Network layer.
Transport layer.
Which layer of the OSI model does a Router work in?
Physical layer.
Data link layer.
Network layer.
Transport layer.
What is the use of Ping command?
To test a bug in an application.
To test a hard disk fault.
To test a device on the network is reachable.
To test a printer quality.
Which of the following commands is used to manage the IP address assigned to the machine that it is running in?
Ping.
Route.
Nslookup.
Ipconfig.
A data unit on physical layer is known as ______________.
Bit.
Frame.
Packet.
Segment.
Which layer of the OSI model are operating as same function as the Internet layer of the TCP/IP model?
Transport.
Presentation.
Session.
Network.
UTP cable has __________________ cables.
2 pair.
3 pair.
4 pair.
5 pair.
What is the purpose of twisting of the wires for twisted pair cable?
Increase electric interference.
Reduce cross-talk interference.
Distinguish cable pairs.
Protect cable pairs.
How to classify twisted pair UTP cables?
Length of cable.
Material.
Length of twist.
All of the mentioned answers.
Category 5e UTP cable is most often used in ______________ network.
Ethernet.
Telephone.
Wireless.
None of the mentioned.
The maximum end-to-end cable length of a single UTP cable that is sufficient for data communication over a computer network is _____________.
120m.
100m.
150m.
90m.
The maximum end-to-end cable length of a single coaxial cable that is sufficient for data communication over a computer network is _____________.
200m.
300m.
400m.
500m.
The maximum end-to-end cable length of a single fiber optic cable that is sufficient for data communication over a computer network is ___________.
1 km.
2 km.
3 km.
4 km.
Which of the following cables is not affected by electromagnetic interference?
Fiber optic cable.
Coaxial cable.
UTP.
STP.
Which of the following physical phenomena is applied in optical fiber transmission?
Scattering phenomenon.
Total internal reflection.
Dispersion phenomenon.
Refraction.
Which of the following cables is usually used for cable television?
Fiber optic cable.
Coaxial cable.
UTP.
STP.
Which device is used for increasing the power of a signal and retransmitting it?
Hub.
Switch.
Router.
Repeater.
Which of the following radiations can be used for communication?
Radio wave, microwave, infrared radiation.
Visible light, ultraviolet radiation.
X-rays, Gamma rays.
All of the mentioned answers.
Which applications/services are radio waves used?
Radar, radio and TV communication.
Microwave ovens.
Sterilizing purpose.
All of the mentioned answers.
Which of the following types of waves are commonly used in remote control devices?
Radio waves.
Microwaves.
Infrared waves.
Gamma rays.
Given the following types of waves: (1) Radio waves; (2) Microwaves; (3) Infrared waves, which one is omnidirectional?
(1)
(2)
(3)
(1), (2), (3)
Given the following types of waves: (1) Radio waves; (2) Microwaves; (3) Infrared waves, which one is directional?
(1), (2)
(2), (3)
(1), (3)
(1), (2), (3)
What is the difference between wired network and wireless network?
Mobility.
Security.
Speed.
All of the mentioned answers.
The process of encoding bits into their corresponding signals is called _____________________.
Digital line coding.
Multiplexing.
De-multiplexing.
None of mentioned answers.
Which of the following technique is used for combining multiple signals into one signal over a shared medium?
Digital modulation.
Multiplexing.
De-multiplexing.
None of mentioned answers.
Which of the following technique is used for reconverting a signal containing multiple signal streams back into the original separate and unrelated signals?
Digital modulation.
Multiplexing.
De-multiplexing.
None of mentioned answers.
Which of the following cables is used for connecting computers to switches?
Straight-through cable.
Crossover cable.
Rollover cable.
None of mentioned answers.
Which of the following cables is used for connecting computers together directly?
Straight through cable.
Crossover cable.
Rollover cable.
None of mentioned answers.
What is the color code for T568A standard?
White/Green, Green, White/Orange, Orange, White/Blue, Blue, White/Brown, Brown.
White/Green, Green, White/Orange, Blue, White/Blue, Orange, White/Brown, Brown.
White/Green, Green, White/Blue, Blue, White/Orange, Orange, White/Brown, Brown.
White/Green, Green, White/Orange, Blue, Orange, White/Blue, White/Brown, Brown.
What is the difference between wiring codes T568A and T568B?
Difference in color codes wires.
Difference in number of wires.
Difference in length of wires.
Difference in manufactures standards.
Which of the following metric is used for measuring of data transferring speed?
b/s.
Mb/s.
Tb/s.
All of the mentioned answers.
What does “bps” stand for?
bits per second.
bytes per second.
kilobits per second.
None of mentioned answers.
Which layer in the OSI model controls transmission errors?
Physical.
Data Link.
Network.
Presentation.
Which of the following functions of data link layer helps slow receivers are not swamped by fast senders?
Providing a well-defined service interface to the network layer.
Dealing with transmission errors.
Regulating the flow of data.
None of mentioned answers.
A data unit on data link layer is known as ______________.
Bit.
Frame.
Packet.
Segment.
How many bits are there in the MAC address?
64 bits.
48 bits.
32 bits.
16 bits.
Which of the following addresses is the physical address?
0F-1F-2F-3F-4F.
0F-1F-2F-3F-4F-5F.
0F-1F-2F-3F-4F-5F-6F.
0F-1F-2F-3F-4F-5F-6F-7F.
A _______________ is a unique identifier assigned to a network interface controller.
Port address.
MAC address.
IP address.
Port and IP address.
Assume that the original data is 00001111 00110011 01111110. Determine the bit sequence to be transmitted with the framing technique using flag bytes with byte stuffing? With byte FLAG = 01111110 and byte ESC = 00001111.
01111110 00001111 00110011 01111110 01111110.
00001111 00110011 00110011 00110011 01111110.
00001111 00001111 00110011 00001111 01111110.
01111110 00001111 00110011 00001111 01111110.
Assume that the original data is 10000011 00001111 01111110. Determine the bit sequence to be transmitted with the framing technique using flag bytes with byte stuffing? With byte FLAG = 01111110 and byte ESC = 00001111.
00001111 10000011 00001111 00001111 01111110.
00001111 00001111 01111110 00001111 00001111.
10000011 00001111 00001111 01111110 00001111.
10000011 00001111 00001111 00001111 01111110.
Assume that receiver receives a correct data frame containing a bit sequence: 10111110 0000111 00001111 0000111 01111110 00110011. Determine the original data by using flag bytes with byte stuffing of the framing technique? With byte FLAG = 01111110 and byte ESC = 00001111.
00001111 10111110 01111110 00110011.
10111110 00001111 01111110 00110011.
00110011 00001111 01111110 10111110.
01111110 00001111 10111110 00110011.
Assume that receiver receives a correct data frame containing a bit sequence: 00001111 00001111 00111111 00001111 01111110. Determine the original data by using flag bytes with byte stuffing of the framing technique? With byte FLAG = 01111110 and byte ESC = 00001111.
00001111 00111111 00001111.
00111111 00001111 01111110.
00001111 00001111 01111110.
00001111 00111111 01111110.
Assume that the original data is 011000101111. Determine the bit sequence to be transmitted by using single bit parity scheme with odd code?
0110001011110.
0110001011111.
0011000101111.
1011000101111.
Assume that the original data is 011000101111. Determine the bit sequence to be transmitted by using single bit parity scheme with even code?
0110001011110.
0110001011111.
0011000101111.
1011000101111.
Assume that the original data is 11011011000101111. Determine the bit sequence to be transmitted by using single bit parity scheme with odd code?
011011011000101111.
111011011000101111.
110110110001011111.
110110110001011110.
Assume that receiver receives a correct data frame containing a bit sequence: 0110001011110. Determine the original data by using single bit parity scheme with odd code?
011000101111.
010001011111.
011000101111.
101100010111.
Assume that receiver receives a correct data frame containing a bit sequence: 0110001011111. Determine the original data by using single bit parity scheme with even code?
101100010111.
010001011111.
011000101111.
011000101111.
Assume that receiver receives a correct data frame containing a bit sequence: 11010011000101111. Determine the original data by using single bit parity scheme with even code?
1110011000101111.
1101011000101111.
1101001100010111.
1010011000101111.
Which of the following techniques is capable of detecting and correcting single bit error?
Single bit parity scheme.
Two-dimensional parity scheme.
Cyclic redundancy check.
All of the mentioned answers.
Assume that the original data is 10101 11110 01110. Determine the bit sequence to be transmitted by using two-dimensional parity scheme with even code and matrix (no. of rows N=3, no. of columns M=5)?
101010 111100 011101 001011.
101011 111101 011101 001010.
101011 111100 011101 001010.
101010 111100 011100 001010.
Assume that receiver receives a correct data frame containing a bit sequence: 101011 111100 011101 001010. Determine the original data by using two-dimensional parity scheme with even code and matrix (no. of rows N=3, no. of columns M=5)?
10101 11100 01101 01011.
11011 11110 01110 00101.
10101 11110 01110 00101.
11010 11100 01110 00101.
Determine the bit pattern from the international standards generator CRC-12= x^12 + x^11 + x^3 + x^2 + x +1?
1110000001111.
1100000001110.
1100000001111.
1100000011111.
Determine the bit pattern from the international standards generator CRC-16= x^16 + x^15 + x^2 +1?
11000000000000101.
11000000000000111.
11000000000000100.
11000000000000011.
Determine the bit pattern from the international standards generator CRC-CCITT= x^16 + x^12 + x^5 +1?
10001000000010001.
10001000000100010.
10001000000100011.
10001000000100001.
Assume that the original data is 10100001. Determine the bit sequence to be transmitted by using Cyclic Redundancy Check (CRC) technique with Generator G(x) = x^3 +1?
10100001 101
10100001 110
10100001 011
10100001 111.
Assume that the original data is 10100011. Determine the bit sequence to be transmitted by using Cyclic Redundancy Check (CRC) technique with Generator G(x) = x^3 +1?
10100011 100.
10100011 001.
10100011 101.
10100011 111.
Which of the following protocols is responsible for resolving IP address to MAC address?
ARP.
HTTP.
ICMP.
DHCP.
Which of the following devices forwarding data based on the destination MAC address?
Hub.
Switch.
Router.
Repeater.
Which of the followings is a characteristic of the Switch?
Plug-and-play.
Self-learning.
Routing.
Plug-and-play and Self-learning.
Which of the following methods is usually applied for controlling multiple accesses in a computer network?
channel partitioning
random access
token passing
no need an access control method.
Which of the following protocols is the random accessing protocols applying for the MAC layer of a computer network?
TDMA
FDMA
ALOHA
CDMA
Which of the following statements is true for the Slotted ALOHA protocol?
In the Slotted ALOHA, time is divided into equal size slots and nodes transmit data at the end of each time-slot.
In the Slotted ALOHA, time is divided into equal size slots and nodes transmit data at the start of each time-slot.
In the Slotted ALOHA, time is divided into equal size slots and node transmits data immediately once it has data.
In the Slotted ALOHA, time is divided into variable size slots and node transmits data immediately once it has data.
Which of the following statements is true for the ALOHA protocol?
In the ALOHA, time is divided into equal size slots and nodes transmit data at the end of each time-slot.
In the ALOHA, time is divided into equal size slots and nodes transmit data at the start of each time-slot.
In the ALOHA, time is divided into equal size slots and node immediately transmits data once it has.
In the ALOHA, node immediately transmits data once it has.
Considering transmission efficiency of three protocols: ALOHA, Slotted ALOHA and CSMA protocols. Which of the following answers is true if the transmission efficiency of those protocols is in ascent order?
CSMA – ALOHA – Slotted ALOHA
ALOHA – Slotted ALOHA – CSMA
Slotted ALOHA – ALOHA – CSMA
CSMA – Slotted ALOHA - ALOHA
Which of the random access protocols does the Ethernet apply?
CSMA/CD
CSMA/CA
ALOHA
Slotted ALOHA
Which of the random access protocols does the Wi-Fi apply?
CSMA/CD
CSMA/CA
ALOHA
Slotted ALOHA
Given the following statement regarding to mechanism for controlling medium access of a computer network: “When the medium is idle for a period of greater than a Distributed InterFrame Space (DIFS), node can transmit data immediately”. Which of the following computer networks applies above-mentioned mechanism?
WiMAX
Ethernet
Wi-Fi
Bluetooth
What is the size of the MAC address?
48 bits
16 bits
32 bit
64 bits
Which of the following addresses is considered as a MAC address?
192.168.1.1
172.16.10.0/24
FE80::250:56FF:FE87:20FB
60-F6-77-BE-A3-2F
Which of the following statements is true for the Address Resolution Protocol (ARP)?
It is used to resolve IP addresses to domain names.
It is used to translate IP addresses to MAC addresses.
It is used to translate MAC addresses to domain names.
It is used to resolve domain names to IP addresses.
In the Slotted ALOHA, collisions could be occurred at
the beginning of the slot
the end of the slot
in the middle of the slot
in any point of the slot
Which of the following statements is true for the Slotted ALOHA and ALOHA (suppose that the network has N nodes)?
the maximum efficiency of the Slotted ALOHA is equal to that of ALOHA.
the maximum efficiency of the Slotted ALOHA is double to that of ALOHA.
the maximum efficiency of the Slotted ALOHA is smaller than that of ALOHA.
the maximum efficiency of the Slotted ALOHA is 100%.
Which of the following algorithms that a network node running CSMA/CA applies for delaying the transmission in order to avoid the collision?
the exponential back-off algorithm
the collision avoid
the carrier sense (CS) algorithm
the multiple access (MA) algorithm
