My answer is BD
It cannot be A, as Junos has an options to automatically assign site identifiers to VPLS sites:
https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/topics/concept/vpns-configuring-vpls-routing-instances.html#id-11510150__id-11568648
B is confirmed as correct on:
https://www.juniper.net/documentation/us/en/software/nce/feature-guide-virtual-private-lan-service/topics/task/vpls-ldp-signaling-solutions.html
D is correct, because as we are not relying on LDP for signalling, we can use RSVP and LDP is signal the LSPs.
B,D are correct. B: For LDP signaling within a VPLS routing instance, the Junos OS supports the following values only: Control Bit = 0; D: L2VPNs decouple the service from the transport by using
MPLS label stacking: the outer label takes the tunneled packets to the egress PE, and
the inner label identifies the VPN service.As for the PSN Tunnels, they are simply MPLS LSPs so all of the options discussed in
Chapter 2 apply here, too: LDP, RSVP-TE, BGP-LU, and SPRING.
https://www.juniper.net/documentation/us/en/software/nce/feature-guide-virtual-private-lan-service/topics/task/vpls-ldp-signaling-solutions.html Juniper supports Control bit 0 for LDP based VPLS . So answer should be B,D
Not 'C' for sure, Layer2 VPN official course page 404 mentions that every remote PE needs to be manually configured. If you want auto-discovery, FEC129 or BGP0-signaled VPLS is required.
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