Exhibit

Study the exhibit which displays an MPLS cell-mode network that is using default label distribution.
When the label request for Network X is sent from router Certkiller A to the MPLS-enabled ATM Switch Certkiller C, which if the following statements are true?

A.
The MPLS-enabled ATM switch Certkiller C will reply with the local label if it already has the next-hop label. Or it will not reply with the local label if it does not have the next-hop label and it will forward the label request to the MPLS-enabled ATM Switch Certkiller D.

B.
The MPLS-enabled ATM switch Certkiller C will reply with the local label then it will send its own label request to MPLS-enabled switch Certkiller D.

C.
Since MPLS-enabled ATM Switch Certkiller C cannot perform IP routing lookup, it will forward the label request to router Certkiller E (an ATM edge LSR) and Router Certkiller E will then reply with its local label to Router CertkillerA (also an ATM edge LSR).

D.
Since the MPLS-enabled ATM Switch Certkiller C cannot perform IP routing lookup, it will reject the label request from Certkiller A.