Choose the most suitable technology for the DCI (Data Center Interconnect) when Data Centers are geographically not in the same building:

Question

Options

• AVSX
• BERPS + VRRP
• CSTP
• DVSF

• A
  4% (2)
• B
  74% (34)
• C
  15% (7)
• D
  7% (3)

Explanation

ERPS + VRRP is correct because geographically separated data centers require a combination of Layer 2 ring protection and Layer 3 gateway redundancy over WAN links. ERPS (ITU-T G.8032) provides fast sub-50ms failover for Ethernet ring topologies spanning long distances, while VRRP ensures default gateway redundancy so hosts maintain connectivity if one DC loses its router.

VSX (HPE's Virtual Switching Extension) requires a low-latency, high-bandwidth ISL between peer switches - practical only within the same building or campus, not across geographic distances. VSF (Virtual Switching Framework) is a local stacking technology with the same distance constraint; it physically chains switches together, making it impossible to deploy across separate sites. STP is a legacy loop-prevention protocol with slow convergence (up to 50 seconds for classic STP) and no gateway redundancy - entirely unsuitable for DCI where fast failover and uptime are critical.

Memory tip: If the question mentions geographic separation, eliminate any "stacking/virtual chassis" technology (VSX, VSF) immediately - they need close proximity. ERPS handles the ring between distant sites; VRRP handles the router failover. Ring + Router = Remote DCI.

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