Which two statements are correct about VPLS tunnels? (Choose two.)
Which two statements are correct about VPLS tunnels? (Choose two.)
LDP-signaled VPLS tunnels only support control bit 0, which means that as far as control bits are concerned, only bit 0 is used in these tunnels. Also, BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers. This is because the signaling method (BGP in this case) is separate from the underlying transport method (RSVP or LDP).
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.
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.
A,C are correct
CB are the correct answers
BD, not CB
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