Question 81 Telephone systems based on -------- digitize analog voice, compress

Question

Question 81

Telephone systems based on -------- digitize analog voice, compress it, and put into packets. An important point is that this format, the IP, is compatible with existing data networks. Therefore, voice can travel on the same infrastructure as data and video.

ATM

PSTN

VoIP

PSDN

Question 78

Connections on --------- and -------- run at wire speed

layer 3 switches, hubs

layer 2 switches, hubs

hubs, switches

layer 2, layer 3 switches

Question 77

The ------ is a device that connects n inputs to m outputs.

modem

crosspoint

RAM

crossbar

ATM

PSTN

VoIP

PSDN

Question 78

Connections on --------- and -------- run at wire speed

layer 3 switches, hubs

layer 2 switches, hubs

hubs, switches

layer 2, layer 3 switches

Question 77

The ------ is a device that connects n inputs to m outputs.

modem

crosspoint

RAM

crossbar

Explanation / Answer

Answer:

81) The description given matches the features of VoIP.

78) Layer 2 and Layer 3 switches both operates at wire speed

77) A crossbar switch connects n imputs to m outputs

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