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A. To provide a visible extension of MPLS TTL functionality in a non MPLS-enabled domain
B. To improve the IGP convergence time
C. To hide visibility to the core (provider) routers in the MPLS network
D. To provide a visible extension of IP TTL functionality in an MPLS-enabled domain

A. When a router receives a failure response, it stops querying authentication methods.
B. When a router receives an error response, it stops querying authentication methods.
C. If the router receives a failure response from an authentication method, it queries the next method.
D. The router does not differentiate between failure and error responses; the authentication process is always interrupted.
E. If it receives no response from the authentication method, a router will determine the error condition On its own; the router also has the option to proceed to the next method in a list if configured accordingly.