CCNP SP MPLS FAQ: MPLS and Quality of Service Q1. How many bits in the IP header can be used for QoS? Answer: Three bits in the IP header can be used for QoS if the precedence bits are used, and six bits can be used if the DSCP bits are used. Q2. How many AF classes exist? Answer: Four AF classes exist. Q3. Name the three MPLS DiffServ models. Answer: Uniform model, Pipe … [Read more...]