Free Juniper JN0-683 Actual Exam Questions - Question 8 Discussion

It’s A because the border spine devices are designed for stitching VLANs like Blue across DCs in ERB. The Red and Green VLANs usually get routed, so stitching them isn’t necessary here.

It’s D because adding a lean super spine makes sense when stretching all VLANs and stitching is needed across DCs, covering both inter-VLAN routing and VLAN extension in one place.

Not B, because the interconnect between SRX devices and adding a transit VNI for Red and Green VLANs doesn’t fit the ERB architecture logic here. The Blue VLAN definitely needs to be stretched across DCs.

C/D? I’m thinking C because Red and Green VLANs need stitching since they’re different VLANs, while Blue VLAN gets stretched to be the same across DCs. D sounds overkill with adding a lean super spine; seems unnecessary when the question only stresses Blue VLAN continuity. The super spine idea feels more like a full scaling solution rather than specific to these VLAN needs. So, stitching Red and Green at the leaf level and stretching Blue fits best here.

It’s C, because Red and Green VLANs are separate, so stitching them while stretching Blue fits best.

It’s A. The key is that the Blue VLAN needs to be the same across both DCs, so stitching it makes sense. Also, since both DCs have EVPN-VXLAN with ERB, the eight spine devices acting as border spines and having full mesh interconnect matches that design. The other options talk about stretching or stitching Red and Green VLANs which isn’t required here—they only need to communicate, not necessarily be stretched. So A stands out as the one aligning with the multi-DC EVPN fabric design principles in this context.

Maybe C