352-001 · Question #85
When creating a design plan for IPv6 integration, you decide to use stateless encapsulation of IPv6 packets into IPv4 tunnels between subscriber CPEs and a border relay. Which deployment technique all
The correct answer is A. 6rd. 6rd (IPv6 Rapid Deployment) uses stateless encapsulation to tunnel IPv6 packets over IPv4 infrastructure between subscriber CPEs and a 6rd Border Relay.
Question
When creating a design plan for IPv6 integration, you decide to use stateless encapsulation of IPv6 packets into IPv4 tunnels between subscriber CPEs and a border relay. Which deployment technique allows for this functionality?
Options
- A6rd
- BDual-Stack Lite
- C4rd
- DDSTM
How the community answered
(33 responses)- A94% (31)
- B3% (1)
- C3% (1)
Why each option
6rd (IPv6 Rapid Deployment) uses stateless encapsulation to tunnel IPv6 packets over IPv4 infrastructure between subscriber CPEs and a 6rd Border Relay.
6rd encapsulates IPv6 packets inside IPv4 using a stateless mechanism where the CPE automatically derives its IPv6 prefix from its IPv4 address and the ISP-assigned 6rd prefix. The 6rd Border Relay (BR) decapsulates traffic heading to native IPv6, requiring no per-subscriber tunnel configuration on the provider side.
Dual-Stack Lite tunnels IPv4 traffic over an IPv6 network toward an AFTR for NAT, which is the opposite encapsulation direction from what is described.
4rd (IPv4 Residual Deployment) is designed to carry IPv4 over IPv6 infrastructure, not to encapsulate IPv6 into IPv4 tunnels.
DSTM uses DHCPv6 to assign temporary global IPv4 addresses to IPv6-only hosts and does not perform stateless IPv6-in-IPv4 encapsulation to a border relay.
Concept tested: 6rd stateless IPv6-in-IPv4 tunnel deployment
Source: https://www.rfc-editor.org/rfc/rfc5969
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