Which ingress classification offers the optimal performance and provides the minimum number of actions that match the service provider QoS requirements?

A service provider offers four classes of service for MPLS VPN customer with the following IPP/EXP values

i. voice=5

ii. video=4

iii. priority-data =3

iv. best-effort data=0

The service provider also supports multicast VPN services in the priority data and best-effort classes. Multicast VPN is implemented as a draft-rosen profile. On a P router, in the MPLS core, the ingress. QoS policy-map must classify all incoming packets, so that different classes of traffic can be properly handled in fabric queues and egress queues. All types of packets in the core network must be covered’

Which ingress classification offers the optimal performance and provides the minimum number of actions that match the service provider QoS requirements?
A . class-map match-any VOICE
match mpls experiment topmost 5
class-map match-any VIDEO
match mpls experiment topmost 4
class-map match-any CONTROL
match mpls experiment topmost 6
class-map match-any PRIORITY
match mpls experimental topmost 3
!
policy-map INGRESS
class VOICE
set qos-group 5
class VIDEO
set qos-group 4
class CONTROL
set qos-group 6
class PRIORITY
set qos-group 3
class class-default
B . class-map match-any VOICE
match mpls experiment topmost 5
class-map match-any VIDEO
match mpls experiment topmost 4
class-map match-any CONTROL
match mpls experiment topmost 6 7
match ip precedence ipv4 internet network
class-map match-any PRIORITY
match mpls experimental topmost 3
match ip precedence ipv4 flash
!
policy-map INGRESS
class VOICE
set qos-group 5
class VIDEO
set qos-group 4
class CONTROL
set qos-group 6
class PRIORITY
set qos-group 3
class class-default
C . class-map match-any VOICE
match mpls experiment topmost 5
match ip precedence ipv4 critical
class-map match-any VIDEO
match mpls experiment topmost 4
match ip precedence ipv4 flash-override
class-map match-any PRIORITY
match mpls experimental topmost 3
match ip precedence ipv4 flash
!
policy-map INGRESS
class VOICE
set qos-group 5
class VIDEO
set qos-group 4
class PRIORITY
set qos-group 3
class class-default

View Answer

Answer: C