EC147 - Drag and drop QoS mechanisms

[gustav]

I agree with the following 3 points in the given answer:

• DSCP => portion of the IP header used to claccify packets
  

• CoS => portion of the 802.1Q header used to classify packets
  
• Policing => tool to enforce rate-limiting on ingress/egress
  

...and then I see the following connections:

• Shaping is a bandwidth management technique which delay datagramms.
  

• Service Policy is a mechanism to apply a QoS policy to an interface.
  for example:
  interface serial 1/0
    service-policy output myPolicyMap
  

• Policy Map is a mechanism to create a scheduler for packets prior to forwarding.
  for example:
  policy-map MyPolicyMap
   class VIDEO
     bandwidth 256
   class BUSINESS
     bandwidth 256
   class class-default
     fair-queue
  (so here we have queues for different priority data and they need a CBWFQ scheduler)
  

Agree with my suggestion? And the big question, how does cisco think?