VoIP - Voice Over IP Quiz # 3

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

True

False

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

Transport Security

Data Security

Network Security

Intrusion Detection

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

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

True

False

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

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

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

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

PCM

SS6

ISDN

SS7

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)

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

IPSec

DES

3DES

None of the above

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

6

12

24

48

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

Transport

Encapsulation

Tunnel

All of the above

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

Time stamping

Acknowledgements

Sequence numbering

Delivery monitoring

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)

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

CAT 5 cable

Copper wire

Fibre Optic

All of the above

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

Sampling

Decoding

Converting

Filtering

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

Transport Layer

Session Layer

Presentation Layer

Network Layer

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

TCP

UDP

SMTP

None of the above

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

Header Compression

Fragmentation

Codec

Resource Reservation Protocol

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

Yes

No

Which of the following are voice compression techniques?

Waveform algorithms

Frequency algorithms

Source algorithms

Encoding algorithms

What is the speed of a T1 line?

128 kbps

144 kbps

2.048 Mbps

1.544 Mbps

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

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

2

16

23

24

Quiz:	VoIP - Voice Over IP Quiz # 3
Subject:	Basic Voice Over Ip Test
Total Questions:	24 MCQs
Time:	24 Minutes

VoIP - Voice Over IP Quiz # 3

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

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

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

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

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

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

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

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

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

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

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

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

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

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?

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

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

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

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

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

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

Which of the following are voice compression techniques?

What is the speed of a T1 line?

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

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

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

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