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36 Cards in this Set

  • Front
  • Back
State the default bandwidth setting for serial interfaces on Cisco routers.
On serial interfaces, the default bandwidth setting is T1 speed - regardless of the actual bandwidth.
What are the default units when specifying the bandwidth of an interface?
Bandwidth is specified in kbps

ie: "bandwidth 1544"
State the QoS tools that affect Bandwidth directly.
Compression, CAC (Call Admission Control) and Queuing
State 8 types of "delay"
Serialization, Propagation, Queuing, Forwarding / Processing, Shaping, Network, Codec, Compression
Which types of delay are "fixed"?
Serialization, Propogation, Codec
Which types of delay are "variable"?
Queuing, Forwarding / Processing, Shaping, Network, Compression
Formula for serializaion delay?
Serialization delay =

number of bits sent / link speed (in bits per second)
Formula for propagation delay?
Propagation delay =

Length of Link (meters) / 3.0 x 10^8 meters/sec
Serialization delay is affected by what two variables?
Link speed and the size of the packet.
Which QoS tools affect delay?
Queuing, LFI, Compression, Traffic Shaping
Which QoS tools affect Jitter?
Queuing, LFI, Compression, Traffic Shaping
Which QoS tools affect Loss?
Random Early Detection, Queuing
What is the bit rate for voice payload using the G.711 PCM codec?
64 kbps

160 bytes payload per packet for 20ms of voice
Excluding layer 2 headers and trailers what is the bit rate for voice payload using the G.726 ADPCM codec?
32 kbps

80 bytes payload per packet for 20ms of voice
What is the bit rate for voice payload using the G.729 codec?
8 kbps

20 bytes payload per packet for 20 ms of voice
How to classify H.323/H.225 protocol
TCP Port 1720
How to classify H.323/H.245
TCP ports 11xxx
How to classify H.323/H.245
TCP port 1720 (Fast Connect)
How to classify H.323/H.225 RAS
TCP Port 1719
How to classify "Skinny" protocol?
TCP Ports 2000-2002
How to classify Simple Gateway Control Protocol (SGCP)
TCP Port 2000-2002
How to classify Media Gateway Control Protocol (MGCP)
UDP port 2427, TCP port 2428
How to classify Intra-Cluster Communications Protocols (ICCP)
TCP port 8001-8002
How to classify Real Time Transport Protocol (RTP)
UDP ports 16384-32767, even ports only
How to classify Real Time Control Protocol (RTCP)
UDP ports 16385-32767, odd ports only; uses RTP port + 1
The actual bandwidth used for a voice payload call depends on what factors?
Codec, Packet overhead (IP/UDP/RTP), Data-Link Framing, Compression
ITU Acceptable range of one-way delay for voice?
150ms
Cisco's acceptable range for one-way delay for voice?
200ms
Identify three types of delay unique to voice traffic?
Codec Delay, Packetization Delay, De-Jitter Buffer Delay
What is the default initial playout delay in Cisco IOS Gateways?
40ms
Real Time Streaming Protocol Ports
TCP or UDP port 554
Cisco recommend that no more than what percentage of a link be reserved for video traffic?
33%
When configuring queuing tools for video you should allocate what percentage more than the average bandwidth to deal with the variability in video traffic flows?
20%
What is the typical video delay budget for high quality video conferencing?
200ms
True or False...

Using RED or video or voice traffic flows is good idea
False
Three steps for planning and implementing QoS?
1) Identify traffic
2) Divide traffic into classes
3) Define QoS policies for each class.