Exam JN0-649 topic 1 question 19 discussion

A. VXLAN could be implemented on your network across this service provider network. could be a valid option. B. Each campus switch shown must have a C-Tag 300 configured. no, since the provider is using S-Tag 300 and QinQ, you can use C-Tag 300 but also other, it's not a must. C. L2PT is required on the SP network to support the spanning tree protocol. yes, is needed! D. Each campus switch shown must have S-Tag 300 configured. no, the S-Tag is taken care of the providers QinQ

AC is correct.

Is fair to say, that considering that this is not an EVPN related question, CD do seem to be correct

A can be correct as we have layer 3 access to the all Camnpus's switche loopback ip address.

i think bc s-tag is handled by SP.

VXLAN , L2PT and S-Tag(service VLAN) are handled by ISP. C-Tag (customer VLAN) is handled by customer. In fact, in customer view, 2 campus switches are direct connected to each others so that they have to configure same vlan info whatever it is trunk or access port.

https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/ref/statement/layer2-protocol-tunneling-edit-vlans-l2pt-ex-series.html