Some early review answers for the 642-642 QoS exam

May 2nd, 2008 Bryan Posted in Cisco, QoS |

What is the ’best’ solution for reducing delay on a link? increase the bandwidth of the link
What are three characteristics of converged network traffic? constant small-traffic flow, time sensitive packets, and brief outages are unacceptable
How much one-way delay can a voice packet tolerate? 150ms
Which transport layer protocol is used for voice traffic? UDP
What are three advantages of using MQC? reduction in configuration time, ability to apply one policy to multiple interfaces, and seperation of classification from policy definition
Which QoS model is least scalable? Integrated Services
What three QoS mechanisims work together to provide a set of complete integrated services? Weighted Random Early Detection, Weighted Fair Queueing, Resource Reservation Protocol
What is the most important advantage of the DiffServ QoS model? High Scalability
Services are provided to which DiffServ entitity? Classes of Traffic
How many bits is the DSCP field of the IP Header? 6
If DSCP were respectively set to 101000, 011000, 111000 and 001000, which packet would have the greatest probability of timely forwarding? 111000
Which QoS mechanism is used on both input and output interfaces? Traffic Policing

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