Which are the two purposes of the MPLS label value 1? (Choose two.) 

Answer options:

A. it is used for MPLS OAM packets.
B. it indicates an implicit null label.
C. it is used for VPNv6 packets.
D. it is used to carry the QoS value in the label stack.
E. it indicates an explicit null label.
F. it indicates a router alert label.

CF

http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/4649-mpls-faq-4649.html#qa3 http://www.iana.org/assignments/mpls-label-values/mpls-label-values.xhtml IPv4 Explicit NULL Label ----> 0 Router Alert Label ----> 1 - IPv6 Explicit NULL Label -----> 2 Implicit NULL Label -----> 3 - OAM Alert Labe -----> 14