CCIE SP OEQ 4

SP QoS quiz !

Q1.
How many bits in the IP header can be used for QoS?

Q2.
How many AF classes exits?

Q3.
Name the 3 MPLS DffServ models

Q4.
What it the difference between the Pipe and Short Pipe models?

Q5.
What is the interface command to encapsulate all IP packets with an explicit NULL label?

Q6.
What is TOS reflection?

Q7.
What feature is used in Cisco IOS to alter the EXP bits?

Q8.
What is the problem with PHP and QoS?

Q9.
What is the solution to the problem in quesion 8?

Q10.
On which labels can you change the EXP bits value?

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A1.
3 bits for IP precedence or 6 bits for DSCP

A2.
4

A3.
Uniform model, Pipe model and Short pipe model

A4.
Pipe model using the LSP DiffServ information to forward packets on egress LSR
Short pipe model useing the Tunnel DiffServ information to forward packets on egress LSR

A5.
mpls ip encapsulate explicit-null

A6.
The default behavior of copying the precedence value of an IP packet to the EXP bits of all imposed labels

A7.
MQC

A8.
the EXP bits value is not copied to the newly exposed MPLS label or precedence/DiffServ bits in the IP header, if the packet becomes unlabeled

A9.
explicit NULL label or qos-group

A10.
the top label and the pushed label