352-001 · Question #56
Company X will be integrating an IPv6 application into their network and wants to develop a test environment to evaluate application performance across the network. This application will require…
The correct answer is C. DMVPN. DMVPN is the only listed technology that natively supports both IPv6 unicast and multicast transport over an existing IPv4-only infrastructure, satisfying the application's dual communication requirements.
Question
Company X will be integrating an IPv6 application into their network and wants to develop a test environment to evaluate application performance across the network. This application will require both unicast and multicast communications. The company can do this implementation only in certain areas of its existing IPv4-only network, but wants all areas to communicate with each other. When developing the design to provide connectivity between these testing locations, what tunneling technology would work in this scenario?
Options
- AISATAP
- B6to4
- CDMVPN
- D6vPE
- E6PE
How the community answered
(40 responses)- A10% (4)
- B5% (2)
- C83% (33)
- D3% (1)
Why each option
DMVPN is the only listed technology that natively supports both IPv6 unicast and multicast transport over an existing IPv4-only infrastructure, satisfying the application's dual communication requirements.
ISATAP is an intra-site automatic tunneling mechanism that does not support IPv6 multicast, making it incompatible with the application's multicast requirement.
6to4 provides unicast-only automatic IPv6-over-IPv4 tunneling using shared relay infrastructure and lacks reliable multicast support for a controlled test environment.
DMVPN uses multipoint GRE tunnels over an IPv4 underlay and supports the forwarding of IPv6 unicast and multicast traffic across the IPv4 backbone, allowing geographically separated IPv6 test sites to communicate without requiring a full network-wide IPv6 upgrade; this flexibility makes it the right fit for a partial-deployment test environment.
6vPE is an MPLS-based IPv6 VPN technology that requires an MPLS-enabled core, which is not present in the described IPv4-only network.
6PE also requires an MPLS backbone to carry IPv6 prefixes between PE routers and cannot function over a plain IPv4-only infrastructure.
Concept tested: IPv6 unicast and multicast tunneling over IPv4 infrastructure
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/15-e/ipv6-15-e-book/ip6-over-ipv4-tunls.html
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