Cisco CIVND Flashcards
What is the basis of analog video broadcasting?
Frequency Division Multiplexing (FDM)
What are the analog video broadcasting standards?
NTSC, PAL, and SECAM
What are the video signaling protocols?
ISDN, H.323, SIP, SCCP
Explain the two variations of ISDN.
BRI = 1 D channel plus 2 Bearer channels (64 Kbps each) PRI = 1 D plus 23 B
Describe the protocols that make up H.323.
H.225 - signaling
H.245 - negotiate media (ports, codecs, etc.)
H.450 - supplementary services (hold, transfer, retrieve, etc.)
What are the 5 components of SIP?
User Agent Client User Agent Server Registrar Server Proxy Server Redirect Server
What carries the media stream after signaling establishes the connection?
RTP (Real-Time Transport Protocol)
How does RTP know the correct order to deliver packets?
RTP includes a sequence number.
What is the RTP port range?
16384 - 32768
Explain RTCP as it relates to RTP.
It provides call statistics and always uses the odd number port immediately after the even number RTP port.
List the video codecs.
MPEG-1
MPEG-2
MPEG-4 / H.264
List the audio codecs and associated bandwidth.
G.711 (64 Kbps), G.729 (8 Kbps), and iLBC (15.2 Kbps)
Explain the properties of the MPEG-4 / H.264 codec.
Bandwidth efficient, AAC, DRM, high quality, low bit-rate.
How many FPS is 50I?
25 frames per second
Explain the difference between Interlacing and Progressive.
Interlacing splits each frame into 2 - 1 with odd lines and another with even lines. Progressive shows the entire frame.
Explain the difference between multipoint/multisite and multiway.
This refers to telepresence endpoint capabilities to support multiple parties in the same call. Multipoint/multisite is the ability of the endpoint itself to mix the streams. Multiway engages external hardware resource called an MCU.
What is maximum number of participants supported on a Cisco telepresence endpoint with the multisite license?
4 (endpoint hosting the conference plus 3 others)
Explain the difference between VCS Control/Expressway and Expressway Core/Edge.
VCS Control is used to register endpoints and call control.
VCS Expressway allows firewall traversal for external calls.
Expressway Core/Edge allow an endpoint outside the firewall to register with CUCM inside the firewall. It does not provide call control.
Describe the benefits of Cisco Discovery Protocol (CDP)
CDP can discover the amount of PoE power needed for an endpoint.
CDP sends the voice VLAN information.
What is the open standard equivalent of Cisco Discovery Protocol (CDP)?
LLDP[-MED] - MED provides supplementary services like PoE power and voice VLAN info.
What is the DHCP option that points an endpoint to the TFTP server for configuration download?
Option 150. Option 66 is an lesser-used alternative that uses hostname/DNS to lookup the TFTP server.
