MCQs in Introduction to Datacom and NetworkingChoose the letter of the best answer in each questions.

1. There are ______________ Internet service providers.

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

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

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

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

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

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

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

5. Which topology requires a multipoint connection?

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

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

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

7. 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

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

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

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

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

10. Frequency of failure and network recovery time after a failure are measures of the _______of a network.

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

11. A television broadcast is an example of _______ transmission.

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

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

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

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

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

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

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

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

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

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

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

17. This was the first network.

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

18. Devices may be arranged in a _____ topology.

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

19. _______ is the protocol suite for the current Internet.

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

20. ________ is a collection of many separate networks.

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

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

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

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

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

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

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

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

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

25. Which topology requires a central controller or hub?

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

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

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

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

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

28. _______ 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

29. An unauthorized user is a network _______ issue.

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

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

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

31. 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

All of the above

Topology

WAN

Point-to-point

Bus

Protocol

Point-to-point

Message

Semantics

Reliability

Simplex

All of the above

Forums

EIA

LAN

Timing

ARPANET

All of the above

TCP/IP

An internet

Multipoint

FCC

IMP's

Simplex

Star

Medium

Multipoint

Syntax

Security

RFC

Full-duplex

MCQs in Network Models Set 1Choose the letter of the best answer in each questions.

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

A)   data link

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

2. Which of the following is an application layer service?

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

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

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

4. __________ provides full transport layer services to applications.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

A)   connection-oriented B)   reliable

C)   both a and b D)   none of the above

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

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

14. ICMPv6 includes _______.

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

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

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

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

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

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

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

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

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

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

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

20. The _______ layer changes bits into electromagnetic signals.

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

21. IPv6 has _______ -bit addresses.

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

22. The_____ address identifies a process on a host.

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

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

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

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

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

1. Network

2. All of the above

3. Transport

4. TCP

5. Transport

6. Data link

7. Data link

8. User

9. Network

10. Transport

11. Transport

12. None of the above

13. Transport

14. IGMP and ARP

15. IP

16. Physical

17. Network

18. Application

19. ISO

20. Physical

21. 128

22. Port

23. Transport

24. Application

MCQs in Network Models Set 2Choose the letter of the best answer in each questions.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

32. The OSI model consists of _______ layers.

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

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

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

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

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

35. Why was the OSI model developed?

A)   The rate of data transfer was increasing exponentially B)   Standards were needed to allow any two systems to communicate

C)   Manufacturers disliked the TCP/IP protocol suite. D)   None of the above

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

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

37. 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)   session B)   physical C)   transport D)   presentation

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

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

39. The Internet model consists of _______ layers.

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

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

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

41. _______ 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)   IP B)   TCP C)   UDP D)   none of the above

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

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

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

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

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

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

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

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

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

A)   logical

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

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

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

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

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

Application

26. Logical

27. Added

28. Bits

29. Port

30. 6-byte

31. Physical

32. Seven

33. Physical

34. Network

35. Standards were needed to allow any two systems to communicate

36. Removed

37. Session

38. OSI

39. Five

40. Process-to-process message delivery

41. UDP

42. Session

43. 16

44. Presentation

45. Five-layer; before

46. Physical

47. OSI

48. Presentation

MCQs in Data and SignalsChoose the letter of the best answer in each questions.

1. If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.

A)   2 B)   1 C)   -2 D)   between -2 and 2

2. _________ can impair a signal.

A)   Noise B)   Attenuation C)   Distortion D)   All of the above

3. ________is the rate of change with respect to time.

A)   Time B)   Frequency C)   Amplitude D)   Voltage

4. A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.

A)   P2 equals P1 B)   P2 is zero C)   P2 is much larger than P1 D)   P2 is much smaller than P1

5. Baseband transmission of a digital signal is possible only if we have a ____ channel.

A)   bandpass B)   low-pass C)   high rate D)   low rate

6. ________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.

A)   Distortion B)   Attenuation C)   Noise D)   Decibel

7. A sine wave in the ______ domain can be represented by one single spike in the _____ domain.

A)   time; phase B)   frequency; time C)   time; frequency D)   phase; time

8. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?

A)   5 KHz B)   47 KHz C)   57 KHz D)   10 KHz

9. In a time-domain plot, the horizontal axis is a measure of ________.

A)   phase B)   signal amplitude C)   frequency

D)   time

10. _______ data are continuous and take continuous values.

A)   digital B)   analog C)   (a) or (b) D)   none of the above

11. Frequency and period are ______.

A)   proportional to each other B)   inverse of each other C)   the same D)   none of the above

12. When propagation speed is multiplied by propagation time, we get the ________.

A)   wavelength of the signal B)   throughput C)   distance a signal or bit has traveled D)   distortion factor

13. A _________ sine wave is not useful in data communications; we need to send a _______ signal.

A)   single-frequency; composite B)   composite; single-frequency This is the correct answer. C)   single-frequency; double-frequency D)   none of the above

14. The _________ product defines the number of bits that can fill the link.

A)   delay-amplitude B)   frequency-amplitude C)   bandwidth-period D)   bandwidth-delay

15. _______ signals can have only a limited number of values.

A)   Digital

B)   Analog C)   (a) or (b) D)   None of the above

16. Before data can be transmitted, they must be transformed to ________.

A)   periodic signals B)   electromagnetic signals C)   aperiodic signals D)   low-frequency sine waves

17. Data can be ________.

A)   digital B)   analog C)   (a) or (b) D)   none of the above

18. ________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.

A)   Noise B)   Distortion C)   Attenuation D)   Decibel

19. Signals can be ________.

A)   digital B)   analog C)   either (a) or (b) D)   neither (a) nor (b)

20. A sine wave is ________.

A)   periodic and discrete B)   aperiodic and discrete C)   periodic and continuous D)   aperiodic and continuous

21. _______ data have discrete states and take discrete values.

A)   Analog B)   Digital C)   (a) or (b) D)   None of the above

22. For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.

A)   noiseless B)   noisy C)   low-pass D)   bandpass

23. What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?

A)   1 KHz B)   3 MHz C)   4 MHz D)   none of the above

24. _____ signals can have an infinite number of values in a range.

A)   Analog B)   Digital C)   (a) or (b) D)   None of the above

25. A(n)_________ signal is a composite analog signal with an infinite bandwidth.

A)   digital B)   analog C)   either (a) or (b) D)   neither (a) nor (b)

26. A periodic signal completes one cycle in 0.001 s. What is the frequency?

A)   1 Hz B)   100 Hz C)   1 KHz D)   1 MHz

27. The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.

A)   period B)   bandwidth C)   frequency D)   amplitude

28. ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.

A)   Noise B)   Distortion C)   Attenuation D)   Decibel

29. _______ describes the position of the waveform relative to time 0.

A)   Amplitude B)   Phase C)   Frequency D)   Voltage

30. Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.

A)   one-half B)   twice C)   the same as D)   indeterminate from

31. As frequency increases, the period ________.

A)   increases B)   decreases C)   doubles D)   remains the same

32. If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.

A)   low-pass B)   low rate C)   bandpass D)   high rate

33. For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.

A)   low-pass B)   bandpass C)   noisy D)   noiseless

34. In a frequency-domain plot, the horizontal axis measures the ________.

A)   phase B)   frequency C)   slope D)   peak amplitude

1. -2

2. All of the above

3. Frequency

4. P2 equals P1

5. Low-pass 

6. Attenuation

7. Time; frequency

8. 57 KHz

9. Time

10. Analog

11. inverse of each other

12. distance a signal or bit has traveled

13. single-frequency; composite

14. Bandwidth-delay

15. Digital

16. Electromagnetic signals

17. Analog or Digital

18. Distortion

19. Either analog or digital

20. Periodic and continuous

21. Digital

22. Noisy

23. 3 MHz

24. Analog

25. Digital

26. 1 KHz

27. Bandwidth

28. Noise

29. Phase

30. Twice

31. Decreases

32. Bandpass

33. Noiseless

34. Frequency