— Exhibit –-
— Exhibit —
This diagram details the network connectivity from an NSX network and the supporting physical ne
twork. Locations C and D may be required to process packets with QoS tags.
Based on the diagram, which statement details proper processing of packets if they are QoS
tagged?
A.
Locations C and D will trust the QoS tags of the encapsulated frame when passing packets.
B.
Location B should trust the QoS tags of the encapsulated frames that are switched.
C.
Location A will mark the inner header of the encapsulated frame.
D.
Location B should trust the QoS tags of the external header.
For virtualized environments, the hypervisor presents the trusted boundary, meaning it sets the respective QoS values for the different traffic types. In this case, the physical switching infrastructure is expected to “trust” these values. No
reclassification is necessary at the server-facing port of a leaf switch. If there were a congestion point in the physical switching infrastructure, the QoS values would be looked at to determine how traffic should be sequenced—and potentially dropped—or prioritized.
This question isn’t very clear. They should first of all state emphatically that VTEP tunnels are being used so we definitely know whether or not there is an “outer header” Or perhaps, maybe thats the trick? Thus option D is the only one that makes sense? [SInce this would need to allow for traffic that may not involve VTEP tunnels at all?]
Design guide page 69
NSX-v allows trusting the DSCP marking originally applied by a virtual machine or to explicitly modify and set the DSCP value at the logical switch level. In both cases, the DSCP value is then propagated to the outer IP header of VXLAN encapsulated frames. This enables the external physical network to prioritize the traffic based on the DSCP setting on the external header.
Answer is D
update, it’s P 103 – Design guide