300-610 · Question #205
An engineer must interconnect customer data centers by using a 10-Gbps, unicast-only, Layer 3 circuit. The requirement is to stretch the Layer 2 connection over the tunnel, isolate STP traffic, and cr
The correct answer is D. VXLAN EVPN. An engineer needs to interconnect data centers over a 10-Gbps unicast-only Layer 3 circuit, stretching Layer 2, isolating STP, and supporting millions of logical network segments.
Question
An engineer must interconnect customer data centers by using a 10-Gbps, unicast-only, Layer 3 circuit. The requirement is to stretch the Layer 2 connection over the tunnel, isolate STP traffic, and create more than two million logical network segments. Which solution meets these requirements?
Options
- AIPsec over GRE
- BOTV
- Cdark fiber
- DVXLAN EVPN
How the community answered
(21 responses)- A5% (1)
- B5% (1)
- C14% (3)
- D76% (16)
Why each option
An engineer needs to interconnect data centers over a 10-Gbps unicast-only Layer 3 circuit, stretching Layer 2, isolating STP, and supporting millions of logical network segments.
IPsec over GRE provides a secure tunnel for IP traffic but does not inherently offer Layer 2 extension, STP isolation, or the scalability for millions of logical network segments as required.
OTV (Overlay Transport Virtualization) provides Layer 2 extension and STP isolation over an IP underlay but is typically limited in scalability compared to VXLAN EVPN for millions of segments, and it might have different operational complexities than EVPN in certain designs.
Dark fiber provides a dedicated physical connection but is not a technology for stretching Layer 2, isolating STP, or creating logical network segments; it simply provides the raw physical medium.
Concept tested: Data Center Interconnect Layer 2 extension with VXLAN EVPN
Source: https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/cisco-nexus-9000v-vxlan-evpn-configuration-guide.html
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