1. Quality of Service What is QoS? When is it needed?
How is it implemented?

2. What is Quality of Service
Providing preferential/priority treatment of certain types of traffic

3. When is Quality of Service Needed?
When there is the possibility of congestion
When congestion will unduly affect the quality of the user experience for some traffic

4. How is Quality of Service Implemented?
Implemented through Queueing
Default is FIFO except serial interfaces at E1 or below
WFQ (Weighted Fair Queueing) default on serial interfaces at E1 or below
Automatically gives low volume traffic streams preferential treatment

5. How is Quality of Service Implemented?
CBWFQ (Class Based Weighted Fair Queueing)
Traffic priorities are established
Network management traffic is always given the highest priority
Voice and video usually next
Traffic classifications are established

6. How is Quality of Service Implemented?
Priority queues are created and configured
Priority traffic is identified and classified
Packet content inspection
IP precedence/TOS field – DSCP codes
Outgoing traffic is placed in proper queue
Queue is serviced

7. How is Quality of Service Implemented?
LLQ (Low Latency Queueing)
Adds a strict priority queue
All packets in strict priority queue serviced without sharing bandwidth with other traffic