VoIP Overview

Question 1

Provides IP endpoints for voice communications.

Answer 1

IP Phones

Question 2

Provides Call Admission Control (CAC), bandwidth control and management, and address translation.

Answer 2

Gatekeeper

Question 3

Interfaces with public switched telephone networks (PSTNs) and VoIP networks. They also provide physical access for local analog and digital voice devices, such as telephones, fax machines, key sets, and private branch exchanges (PBX).

Answer 3

Gateway

Question 4

Provides real-time connectivity for participants in multiple locations to attend the same videoconference or meeting.

Answer 4

Multipoint Control Unit (MCU)

Question 5

Provides call control for IP phones, CAC, bandwidth control and management, and address translation. Unlike a gatekeeper, which in a Cisco environment typically runs on a router, a call agent typically runs on a server platform. Cisco Unified Communications Manager is an example of a call agent.

Answer 5

Call Agent

Question 6

Provide services such as voicemail, unified messaging, and Cisco Communications Manager Attendant Console.

Answer 6

Application Servers

Question 7

Provides access for end-user participation in videoconferencing. Also contains a video capture device for video input and a microphone for audio input. A user can view video streams and hear audio that originates at a remote user station.

Answer 7

Videoconference station

Question 8

Required VoIP functionality includes these functions:

Answer 8

Signaling

Database services

Bearer control

Codecs

Question 9

Known also as triple-play services networks, are networks that can transmit data, voice, and video, or any combination of these services over the same networks

Answer 9

Converged Network

Question 10

The set of techniques that are used to manage network resources by controlling the bandwidth, delay, delay variation (jitter), and packet loss parameters.

Answer 10

Quality of Service (QOS)

Question 11

Cisco collaboration components can be organized into five areas:

Answer 11

Infrastructure
Call Control
Collaboration applications (IM and Presence, Voice messaging and Customer contact)
Conferencing (Cisco Webex, Cisco Meeting Server)
Endpoints (Phones, Cisco TelePresence and Software clients)

Question 12

An action sequence formed by a series of images, and each image in the series succeeds the previous one in the timeline of the action sequence to be displayed

Answer 12

Video Frame

Question 13

A process by which the overall size of the video information is compacted

Answer 13

Compression in IP Video Solutions

Question 14

Compression reduces the video size so that it can be transmitted more easily. The primary compression methods for IP video are?

Answer 14

Lossless

Lossy

Question 15

Both video compression methods can use the following techniques to reduce the video size so that it can be transmitted more efficiently:

Answer 15

Intraframe

Interframe

Question 16

IP video compression produces, on the decompression end, an exact copy of the image that was originally submitted at the input of the compression process. Lossless video compression is rarely used in IP video solutions, because it creates a large quantity of information that poses difficulties for streaming.

Answer 16

Lossless

Question 17

Video compression is based on the premise that not all the video information is relevant or capable of being perceived by the viewer. Therefore, some video information is intentionally discarded during the compression process.

Answer 17

Lossy

Question 18

This technique consists of compressing the contents of a single video frame at a time, without considering previous or succeeding video frames.

Answer 18

Intraframe

Question 19

Is a complete image, like a JPG or BMP image file.

Answer 19

I‑frame (intracoded picture)

Question 20

Holds only the changes in the image from the previous frame

Answer 20

P‑frame (predicted picture)

Question 21

Saves even more space by using differences between the current frame and both the preceding and following frames to specify its content.

Answer 21

B‑frame (bidirectional predicted picture)

Question 22

The key features of Cisco TMS include the following:

Answer 22

Scalable provisioning
Centralized administration
Flexible scheduling
One-Button-to-Push (OBTP)
Phone book management