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Basic VoIP - Voice Over IP MCQ

1. What is the maximum number of telephone calls that can be made from an ISDN PRI (for T1) simultaneously?

Answer

Correct Answer: 23

Note: This Question is unanswered, help us to find answer for this one

2. Which of the following factors can affect QoS (Quality of Service) on a VoIP call?

Network delay

Signal attenuation

Poor compression

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

3. What is the speed of a T1 line?

128 kbps

144 kbps

2.048 Mbps

1.544 Mbps

Answer

Correct Answer: 1.544 Mbps

Note: This Question is unanswered, help us to find answer for this one

4. Which of the following are voice compression techniques?

Waveform algorithms

Frequency algorithms

Source algorithms

Encoding algorithms

Answer

Correct Answer: Waveform algorithms
Source algorithms
Encoding algorithms

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

5. Is it possible for a POTS line running broadband DSL service to support VoIP telephony in the home?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

6. Which of the following can correct small amounts of packet loss in VoIP network?

Header Compression

Fragmentation

Codec

Resource Reservation Protocol

Answer

Correct Answer: Codec

Note: This Question is unanswered, help us to find answer for this one

7. Which of the following protocols does VoIP use at the transport layer of the TCP/IP model?

TCP

UDP

SMTP

None of the above

Answer

Correct Answer: UDP

Note: This Question is unanswered, help us to find answer for this one

8. On which layer of the OSI model does TCP & UDP work?

Transport Layer

Session Layer

Presentation Layer

Network Layer

Answer

Correct Answer: Transport Layer

Note: This Question is unanswered, help us to find answer for this one

9. What are the two steps involved in the process of conversion of digital signals into analog signals?

Sampling

Decoding

Converting

Filtering

Answer

Correct Answer: Sampling
Filtering

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

10. Which of the following cables is mostly used in traditional telephones?

CAT 5 cable

Copper wire

Fibre Optic

All of the above

Answer

Correct Answer: Copper wire

Note: This Question is unanswered, help us to find answer for this one

11. Which protocol is used to reduce the size of RTP/UDP/IP headers from 40 bytes to 2 bytes (mostly) to save bandwidth and provide better throughput?

Real-time Transport Protocol (RTP)

Resource Reservation Protocol (RSVP)

Compressed Real-time Transport Protocol (CRTP)

Real-time Transport Control Protocol (RTCP)

Answer

Correct Answer: Compressed Real-time Transport Protocol (CRTP)

Note: This Question is unanswered, help us to find answer for this one

12. Which of the following services are provided by Real-time Transfer Protocol(RTP)?

Time stamping

Acknowledgements

Sequence numbering

Delivery monitoring

Answer

Correct Answer: Time stamping
Sequence numbering
Delivery monitoring

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

13. Which of the following modes of delivery are supported by IPsec?

Transport

Encapsulation

Tunnel

All of the above

Answer

Correct Answer: Transport
Tunnel

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

14. Into how many smaller bandwidth channels can a T1 line be subdivided?

Answer

Correct Answer: 24

Note: This Question is unanswered, help us to find answer for this one

15. Which of the following encryption technologies cannot be used on international networks?

IPSec

DES

3DES

None of the above

Answer

Correct Answer: IPSec

Note: This Question is unanswered, help us to find answer for this one

16. Which of the following are the major framing standards used for Channel Associated Signaling (CAS) by T1?

Super Frame (SF)

Multi Frame (MF)

Super Extended Frame (SEF)

Extended Super Frame (ESF)

Answer

Correct Answer: Super Frame (SF)
Extended Super Frame (ESF)

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

17. Which of the following is a telephony signaling protocol suite used to set up most of the world

PCM

SS6

ISDN

SS7

Answer

Correct Answer: SS7

Note: This Question is unanswered, help us to find answer for this one

18. Which QoS technique is used to define the maximum size of data packets to prevent excessive serialization delays?

Resource Reservation Protocol

Fragmentation

Queuing

Congestion Avoidance

Header Compression

Answer

Correct Answer: Fragmentation

Note: This Question is unanswered, help us to find answer for this one

19. Between Asymmetric and Symmetric transmissions, which statement is true of Symmetric transmission?

In Symmetric transmission, the upstream data rate is more than the downstream data rate

In Symmetric transmission, the upstream data rate is less than the downstream data rate

In Symmetric transmission, the upstream data rate is the same as the downstream data rate

Symmetric transmission is less expensive as compared to Asymmetric transmission

Answer

Correct Answer: In Symmetric transmission, the upstream data rate is the same as the downstream data rate

Note: This Question is unanswered, help us to find answer for this one

20. Which of the following signaling protocols is used in a common channel to signal all other channels in ISDN?

Q.933A

ANSI

Q.931

DPNSS

Answer

Correct Answer: Q.931

Note: This Question is unanswered, help us to find answer for this one

21.
State whether true or false:
RTP (Real-time Transport Protocol) requests retransmission if a voice packet is lost.

True

False

Answer

Correct Answer:

False

Note: This Question is unanswered, help us to find answer for this one

22. Which of the following are the functions of a voice gateway?

Transcoding digital & analog voice

Connecting IP voice to devices such as IVR systems or fax machines

Providing voice mail service

All of the above

Answer

Correct Answer: Transcoding digital & analog voice
Connecting IP voice to devices such as IVR systems or fax machines

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

23. What are the three elements of a security policy necessary for a VoIP network?

Transport Security

Data Security

Network Security

Intrusion Detection

Answer

Correct Answer: Transport Security
Network Security
Intrusion Detection

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

24.
State whether true or false:
You have to use an H.323 proxy if the firewall does not support dynamic access control.

True

False

Answer

Correct Answer:

True

Note: This Question is unanswered, help us to find answer for this one

25. How many bits are there in a MAC address?

32 bits

48 bits

24 bits

16 bits

Answer

Correct Answer: 48 bits

Note: This Question is unanswered, help us to find answer for this one

26. Which of the following VoIP protocols is an emerging standard for PSTN gateway control?

SIP

MGCP

RTP

H.323

Answer

Correct Answer: MGCP

Note: This Question is unanswered, help us to find answer for this one

27. On which of the following IP enabled devices can VoIP telephone services work?

Computer

Personal Digital Assistant (PDA)

IP telephone

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

28. Which of the following QoS techniques can be used to ensure consistent delivery and throughput of voice packets?

Queuing

Congestion Avoidance

Header Compression

Resource Reservation Protocol

Fragmentation

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

29. What are the three main steps required in the analog-to-digital conversion process?

Compression

Encoding

Filtering

Recording

Sampling

Quantization

Answer

Correct Answer: Sampling
Quantization

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

30. Which of the following are ITU standards for voice compression?

G.701

G.711

G.726

G.728

G.729

G.729A

All of the above

Answer

Correct Answer: G.711
G.726
G.728
G.729
G.729A

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

31. Which of the following devices is used to physically connect all network devices like PCs, IP phones etc. to the LAN?

Router

Switch

Firewall

Server

Answer

Correct Answer: Switch

Note: This Question is unanswered, help us to find answer for this one

32. Which of the following are examples of CCS?

QSIG

Q.933A

SS7

DPNSS

All of the above

Answer

Correct Answer: QSIG
SS7
DPNSS

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

33.
State whether true or false
VoIP runs only on the internet. It cannot run on any other network.

True

False

Answer

Correct Answer:

False

Note: This Question is unanswered, help us to find answer for this one

34. Through which protocols can VPNs be implemented at layer 2?

NTP

PPTP

RTCP

L2TP

Answer

Correct Answer: NTP
PPTP
L2TP

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

35. For which of the following services is SS7 responsible?

Basic call setup, management and tearing down of connections

Call forwarding

Calling party number display

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

36. Which of the following statements are true regarding circuit-switched networks (POTS) and packet-switched networks?

In POTS, if any line is down, a call cannot be made

In POTS, the line never goes down

In packet-switched networks, if any line goes down, the voice packets can still reach their destination by selecting the best alternate route from the available routes

None of the above

Answer

Correct Answer: In POTS, if any line is down, a call cannot be made
In packet-switched networks, if any line goes down, the voice packets can still reach their destination by selecting the best alternate route from the available routes

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

37. Which of the following protocols is used in a VoIP call at the application layer of the TCP/IP model?

NTP

RTCP

RTP

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

38.
State whether true or false:
QSIG is implemented on PRI interfaces only.

True

False

Answer

Correct Answer:

True

Note: This Question is unanswered, help us to find answer for this one

39. Which of the following has the correct sequence (from the lowest layer to the highest)?

Physical, Network, Data Link, Session, Transport, Presentation, Application

Physical, Data Link, Network, Transport, Session, Presentation, Application

Transport, Session, Data Link, Application, Presentation, Network, Physical

Physical, Data Link, Network, Transport, Presentation, Session, Application

Answer

Correct Answer: Physical, Data Link, Network, Transport, Session, Presentation, Application

Note: This Question is unanswered, help us to find answer for this one

40. Which of the following is the reason for using UDP instead of TCP for voice transmission?

UDP is more reliable as compared to TCP

UDP is fast as compared to TCP

UDP re-transmits any packet lost during transmission whereas TCP does not

All of the above

Answer

Correct Answer: UDP is fast as compared to TCP

Note: This Question is unanswered, help us to find answer for this one

41. Which of the following VoIP protocols define end-to-end call signaling methods?

SIP

MGCP

RTP

H.323

Answer

Correct Answer: SIP
H.323

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

42. Which of the following can be used to hide internal network addresses and allow several computers on LAN to simultaneously share the router's global IP address?

DHCP

Firewall

NAT

None of the above

Answer

Correct Answer: NAT

Note: This Question is unanswered, help us to find answer for this one

43. What is the path of wires that connect the subscriber's telephone to the telephone company's switch located at the latter's central office known as?

Trunk

Local Loop

Demarcation Point

Point of Presence

Answer

Correct Answer: Local Loop

Note: This Question is unanswered, help us to find answer for this one

44. Which of the following classes are used for host addressing?

Class A

Class B

Class C

Class D

Class E

All of the above

Answer

Correct Answer: Class B
Class C
Class D

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

45. Which of the following protocols are assigned ports for each voice call?

RTP in transmit direction

RTCP in transmit direction

RTP in receive direction

RTCP in receive direction

Answer

Correct Answer: RTP in transmit direction
RTCP in transmit direction
RTP in receive direction
RTCP in receive direction

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

46. According to the ITU standard G.114, what is the maximum delay acceptable for high quality voice?

100 ms

125 ms

150 ms

200 ms

Answer

Correct Answer: 150 ms

Note: This Question is unanswered, help us to find answer for this one

47. Which of the following statements regarding CRTP is/are false?

CRTP is usually used on slow links i.e. links that have a speed less than 2 Mbps

Enabling CRTP does not add up to processing overhead

Enabling compression on both sides of the link is not required

CRTP can be used to conserve bandwidth on a WAN interface

CRTP is not recommended to be used on fast links i.e. links that have a speed more than 2 Mbps

Answer

Correct Answer: Enabling CRTP does not add up to processing overhead
CRTP can be used to conserve bandwidth on a WAN interface
CRTP is not recommended to be used on fast links i.e. links that have a speed more than 2 Mbps

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

48. What is the minimum bandwidth required for VoIP to deliver high quality services?

32 kbps

64 kbps

128 kbps

256 kbps

Answer

Correct Answer: 64 kbps

Note: This Question is unanswered, help us to find answer for this one

49. Which of the following methods is most commonly used to remove echo in telephone networks these days?

Echo Avoidance

Echo Suppression

Echo Cancellation

All of the above

Answer

Correct Answer: Echo Cancellation

Note: This Question is unanswered, help us to find answer for this one

50. What do you call a medium which allows multiple channels?

Multi mode

Single mode

Broadband

Baseband

Answer

Correct Answer: Broadband

Note: This Question is unanswered, help us to find answer for this one

51. Which of the following are the major VoIP protocols?

SIP

H.323

SMTP

MGCP

FTP

RTP

RTCP

Answer

Correct Answer: SIP
H.323
MGCP
RTP
RTCP

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

52. Which of the following is one of the most important things common in all IP phones?

Global Positioning System (GPS)

Bluetooth

Network Interface Card (NIC)

None of the above

Answer

Correct Answer: Network Interface Card (NIC)

Note: This Question is unanswered, help us to find answer for this one

53. Which of the following are the components of local loop signaling?

Supervisory Signaling

Address Signaling

Trunk Signaling

All of the above

Answer

Correct Answer: Supervisory Signaling
Address Signaling

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

54. What is the range of the frequency of a telephone channel?

10 Hz to 9000 Hz

300 Hz to 3400 Hz

200 Hz to 20000 Hz

16 Hz to 1600 Hz

Answer

Correct Answer: 300 Hz to 3400 Hz

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55. Which of the following is the most common trunk signal type used by E&M signaling?

Wink-start

Immediate-start

Delay-start

Loop-start

Answer

Correct Answer: Wink-start

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56.
State whether true or false:
Stateful firewalls do not remember the previous traffic that has occurred earlier in the session

True

False

Answer

Correct Answer:

False

Note: This Question is unanswered, help us to find answer for this one

57. Which of the following provide transport security by using encryption, data integrity and data authentication?

VPNs

Firewalls

Antivirus

IPSec

Answer

Correct Answer: VPNs
IPSec

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

58. Which of the following is responsible for electrical echo on telephone networks?

Speakerphones

Impedance mismatch

Incorrect voltage

All of the above

Answer

Correct Answer: Impedance mismatch

Note: This Question is unanswered, help us to find answer for this one

59. Which of the following signaling protocols can be used with gateways over a VoIP network?

SIP

H.264

H.323

MGCP

Answer

Correct Answer: SIP
H.323
MGCP

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

60. Which of the following are types of address signaling?

TDM

Pulse dialing

DTMF

FDM

Answer

Correct Answer: TDM
Pulse dialing
DTMF
FDM

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

61. Which layer of the TCP/IP model ensures the quality and deliverability of VoIP packets?

Application

Transport

Internetwork

Physical

Answer

Correct Answer: Application

Note: This Question is unanswered, help us to find answer for this one

62. How many bits are there in a Class B address in Net ID (Network portion) and Host ID (Host Portion) fields by default?

Net ID=8 bits & Host ID=24 bits

Net ID=16 bits & Host ID=16 bits

Net ID=24 bits & Host ID=8 bits

None of the above

Answer

Correct Answer: Net ID=16 bits & Host ID=16 bits

Note: This Question is unanswered, help us to find answer for this one

63. According to the OSI model, which layer performs the function of transforming bits of data into electrical signals and sending those signals across the media?

Network

Data Link

Transport

Physical

Answer

Correct Answer: Physical

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64. How many voice conversations are possible on an E1 line simultaneously?

Answer

Correct Answer: 30

Note: This Question is unanswered, help us to find answer for this one

65. Which of the following ITU standards delivers faxed documents as e-mail attachments over a VoIP netwok?

T.30

T.37

T.38

All of the above

Answer

Correct Answer: T.37

Note: This Question is unanswered, help us to find answer for this one

66. Which of the following signaling protocols is based on the ISDN Q.931 standard?

Q.933A

DPNSS

QSIG

SS7

Answer

Correct Answer: QSIG

Note: This Question is unanswered, help us to find answer for this one

67. Which of the following is used by an exchange to convert analog audio to digitized audio?

SS7

PCM

ISDN

DSL

Answer

Correct Answer: PCM

Note: This Question is unanswered, help us to find answer for this one

68. What is the length of IP v4 addresses (in bits)?

16 bits

32 bits

48 bits

64 bits

Answer

Correct Answer: 32 bits

Note: This Question is unanswered, help us to find answer for this one

69. What is the full form of PSTN?

Public Switched Telephone Network

Packet Service of Telephone Network

Plain Switched Telephone Network

Public Subscriber Trunk Network

Answer

Correct Answer: Public Switched Telephone Network

Note: This Question is unanswered, help us to find answer for this one

70. Which protocol provides end-to-end delivery services for data that requires real-time support such as interactive voice and video?

Real-time Transport Protocol (RTP)

Resource Reservation Protocol (RSVP)

Compressed Real-time Transport Protocol (CRTP)

Real-time Transport Control Protocol (RTCP)

Answer

Correct Answer: Real-time Transport Protocol (RTP)

Note: This Question is unanswered, help us to find answer for this one

71. What is the full form of TDM?

Time Division Multiplexing

Telephone Domain Management

Transmission Division Multiplexing

Time Domain Multiplexing

Answer

Correct Answer: Time Division Multiplexing

Note: This Question is unanswered, help us to find answer for this one

72. What is the full form of SS7?

Secure Signal 7

Secure System 7

Signaling System 7

Switch Signal 7

Answer

Correct Answer: Signaling System 7

Note: This Question is unanswered, help us to find answer for this one

73. Is it possible to transport fax and modem traffic over a VoIP network?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

74. What is the full form of DPNSS?

Dedicated Private Network Signaling Services

Digital Public Network Signaling System

Dual Primary Network System Signaling

Digital Private Network Signaling System

Answer

Correct Answer: Digital Private Network Signaling System

Note: This Question is unanswered, help us to find answer for this one

75. What is a soft phone?

It is a hardware phone especially made for VoIP

It is a software that works on a laptop, desktop or a pocket PC

It is the traditional phone that we use these days

None of the above

Answer

Correct Answer: It is a software that works on a laptop, desktop or a pocket PC

Note: This Question is unanswered, help us to find answer for this one

76. What is the full form of DSL?

Digital Subscription Line

Digital Super Link

Digital Speed Line

Digital Subscriber Line

Answer

Correct Answer: Digital Subscriber Line

Note: This Question is unanswered, help us to find answer for this one

77. Which TCP port number is used by H.323 protocol for call setup?

5060

1720

1718

2727

Answer

Correct Answer: 1720

Note: This Question is unanswered, help us to find answer for this one

78. What is the function of D (Data) channel in ISDN?

It is used for carrying data

It is used for carrying voice

It is used for carrying signaling information

All of the above

Answer

Correct Answer: It is used for carrying signaling information

Note: This Question is unanswered, help us to find answer for this one

79. What is the full form of CCS?

Conditional Channel Signaling

Combined Channel Signaling

Common Channel Signaling

Collective Channel Signaling

Answer

Correct Answer: Common Channel Signaling

Note: This Question is unanswered, help us to find answer for this one

80. What are the functions of Call Control?

Call setup

Call maintenance

Call termination

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

81. What is the full form of L2TP?

Level 2 Technology Protocol

Level 2 Transmission Protocol

Layer 2 Transport Protocol

Layer 2 Tunneling Protocol

Answer

Correct Answer: Layer 2 Tunneling Protocol

Note: This Question is unanswered, help us to find answer for this one

82. What is the full form of POTS?

Public Old Telephone Service

Plain Old Telephone Service

Plain Old Telecommunication System

Protocols Of Telecommunication System

Answer

Correct Answer: Plain Old Telephone Service

Note: This Question is unanswered, help us to find answer for this one

83. What is the full form of BGP?

Border Gateway Protocol

Border Gateway Police

Border Global Position

Border Global Protocol

Answer

Correct Answer: Border Gateway Protocol

Note: This Question is unanswered, help us to find answer for this one

84. What is the full form of 3DES?

Triple Decoding Encoding Standard

Triple Data Encryption Standard

Triple Data Encoding Standard

Triple Digital Encryption Service

Answer

Correct Answer: Triple Data Encryption Standard

Note: This Question is unanswered, help us to find answer for this one

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Basic VoIP - Voice Over IP MCQ

1. What is the maximum number of telephone calls that can be made from an ISDN PRI (for T1) simultaneously?

2. Which of the following factors can affect QoS (Quality of Service) on a VoIP call?

3. What is the speed of a T1 line?

4. Which of the following are voice compression techniques?

5. Is it possible for a POTS line running broadband DSL service to support VoIP telephony in the home?

6. Which of the following can correct small amounts of packet loss in VoIP network?

7. Which of the following protocols does VoIP use at the transport layer of the TCP/IP model?

8. On which layer of the OSI model does TCP & UDP work?

9. What are the two steps involved in the process of conversion of digital signals into analog signals?

10. Which of the following cables is mostly used in traditional telephones?

11. Which protocol is used to reduce the size of RTP/UDP/IP headers from 40 bytes to 2 bytes (mostly) to save bandwidth and provide better throughput?

12. Which of the following services are provided by Real-time Transfer Protocol(RTP)?

13. Which of the following modes of delivery are supported by IPsec?

14. Into how many smaller bandwidth channels can a T1 line be subdivided?

15. Which of the following encryption technologies cannot be used on international networks?

16. Which of the following are the major framing standards used for Channel Associated Signaling (CAS) by T1?

17. Which of the following is a telephony signaling protocol suite used to set up most of the world

18. Which QoS technique is used to define the maximum size of data packets to prevent excessive serialization delays?

19. Between Asymmetric and Symmetric transmissions, which statement is true of Symmetric transmission?

20. Which of the following signaling protocols is used in a common channel to signal all other channels in ISDN?

21. State whether true or false:RTP (Real-time Transport Protocol) requests retransmission if a voice packet is lost.

22. Which of the following are the functions of a voice gateway?

23. What are the three elements of a security policy necessary for a VoIP network?

24. State whether true or false:You have to use an H.323 proxy if the firewall does not support dynamic access control.

25. How many bits are there in a MAC address?

26. Which of the following VoIP protocols is an emerging standard for PSTN gateway control?

27. On which of the following IP enabled devices can VoIP telephone services work?

28. Which of the following QoS techniques can be used to ensure consistent delivery and throughput of voice packets?

29. What are the three main steps required in the analog-to-digital conversion process?

30. Which of the following are ITU standards for voice compression?

31. Which of the following devices is used to physically connect all network devices like PCs, IP phones etc. to the LAN?

32. Which of the following are examples of CCS?

33. State whether true or falseVoIP runs only on the internet. It cannot run on any other network.

34. Through which protocols can VPNs be implemented at layer 2?

35. For which of the following services is SS7 responsible?

36. Which of the following statements are true regarding circuit-switched networks (POTS) and packet-switched networks?

37. Which of the following protocols is used in a VoIP call at the application layer of the TCP/IP model?

38. State whether true or false:QSIG is implemented on PRI interfaces only.

39. Which of the following has the correct sequence (from the lowest layer to the highest)?

40. Which of the following is the reason for using UDP instead of TCP for voice transmission?

41. Which of the following VoIP protocols define end-to-end call signaling methods?

42. Which of the following can be used to hide internal network addresses and allow several computers on LAN to simultaneously share the router's global IP address?

43. What is the path of wires that connect the subscriber's telephone to the telephone company's switch located at the latter's central office known as?

44. Which of the following classes are used for host addressing?

45. Which of the following protocols are assigned ports for each voice call?

46. According to the ITU standard G.114, what is the maximum delay acceptable for high quality voice?

47. Which of the following statements regarding CRTP is/are false?

48. What is the minimum bandwidth required for VoIP to deliver high quality services?

49. Which of the following methods is most commonly used to remove echo in telephone networks these days?

50. What do you call a medium which allows multiple channels?

51. Which of the following are the major VoIP protocols?

52. Which of the following is one of the most important things common in all IP phones?

53. Which of the following are the components of local loop signaling?

54. What is the range of the frequency of a telephone channel?

55. Which of the following is the most common trunk signal type used by E&M signaling?

56. State whether true or false:Stateful firewalls do not remember the previous traffic that has occurred earlier in the session

57. Which of the following provide transport security by using encryption, data integrity and data authentication?

58. Which of the following is responsible for electrical echo on telephone networks?

59. Which of the following signaling protocols can be used with gateways over a VoIP network?

60. Which of the following are types of address signaling?

61. Which layer of the TCP/IP model ensures the quality and deliverability of VoIP packets?

62. How many bits are there in a Class B address in Net ID (Network portion) and Host ID (Host Portion) fields by default?

63. According to the OSI model, which layer performs the function of transforming bits of data into electrical signals and sending those signals across the media?

64. How many voice conversations are possible on an E1 line simultaneously?

65. Which of the following ITU standards delivers faxed documents as e-mail attachments over a VoIP netwok?

66. Which of the following signaling protocols is based on the ISDN Q.931 standard?

67. Which of the following is used by an exchange to convert analog audio to digitized audio?

68. What is the length of IP v4 addresses (in bits)?

69. What is the full form of PSTN?

70. Which protocol provides end-to-end delivery services for data that requires real-time support such as interactive voice and video?

71. What is the full form of TDM?

72. What is the full form of SS7?

73. Is it possible to transport fax and modem traffic over a VoIP network?

74. What is the full form of DPNSS?

75. What is a soft phone?

76. What is the full form of DSL?

77. Which TCP port number is used by H.323 protocol for call setup?

78. What is the function of D (Data) channel in ISDN?

79. What is the full form of CCS?

21.
State whether true or false:
RTP (Real-time Transport Protocol) requests retransmission if a voice packet is lost.

24.
State whether true or false:
You have to use an H.323 proxy if the firewall does not support dynamic access control.

33.
State whether true or false
VoIP runs only on the internet. It cannot run on any other network.

38.
State whether true or false:
QSIG is implemented on PRI interfaces only.

56.
State whether true or false:
Stateful firewalls do not remember the previous traffic that has occurred earlier in the session