Cisco
352-001 · Question #356
352-001 Question #356: Real Exam Question with Answer & Explanation
The correct answer is C: 6RD on CE routers and 6RD border relays at the peering locations. 6RD (IPv6 Rapid Deployment) enables IPv6 services over a pure IPv4-only routed backbone by encapsulating IPv6 packets in IPv4 tunnels between CE routers and 6RD border relays, requiring no MPLS or backbone upgrades.
Question
Which technique can be used to deploy IPv6 services in an IPv4-only routed backbone network?
Options
- ANAT64 at the peering locations
- B6PE in the backbone network
- C6RD on CE routers and 6RD border relays at the peering locations
- Ddual-stack lite and NAT44 at the peering locations
Explanation
6RD (IPv6 Rapid Deployment) enables IPv6 services over a pure IPv4-only routed backbone by encapsulating IPv6 packets in IPv4 tunnels between CE routers and 6RD border relays, requiring no MPLS or backbone upgrades.
Common mistakes.
- A. NAT64 translates between IPv6 and IPv4 address spaces but does not provide a mechanism to tunnel or carry IPv6 traffic across an IPv4-only backbone; it addresses protocol translation at network edges, not transit.
- B. 6PE (IPv6 Provider Edge) requires an MPLS-enabled backbone to carry IPv6 prefixes as labeled routes; it cannot operate over a pure IPv4 routed backbone that has no MPLS label forwarding.
- D. Dual-stack Lite (DS-Lite) does the opposite - it carries IPv4 traffic over an IPv6 access network back to an IPv4 Internet via AFTR, not IPv6 over an IPv4 backbone; NAT44 is also unrelated to IPv6 service delivery.
Concept tested. IPv6 over IPv4 backbone deployment using 6RD
Community Discussion
No community discussion yet for this question.