300-320 · Question #401
What is the preferred protocol for a router that is running an IPv4 and IPv6 dual stack configuration?
The correct answer is C. IPv6. In a dual-stack environment, IPv6 is the preferred protocol because it is the designated successor to IPv4 and modern operating systems and devices prioritize it when both stacks are available.
Question
What is the preferred protocol for a router that is running an IPv4 and IPv6 dual stack configuration?
Options
- AIPX
- Bmicrosoft Netbios
- CIPv6
- DIPv4
How the community answered
(47 responses)- A2% (1)
- B2% (1)
- C89% (42)
- D6% (3)
Why each option
In a dual-stack environment, IPv6 is the preferred protocol because it is the designated successor to IPv4 and modern operating systems and devices prioritize it when both stacks are available.
IPX is a legacy Novell network-layer protocol entirely unrelated to IPv4/IPv6 dual-stack operation.
Microsoft NetBIOS is a session-layer API and naming service, not a network-layer routing protocol relevant to dual-stack selection.
RFC 6724 and modern OS implementations define a default address selection policy that prefers IPv6 over IPv4 in dual-stack configurations. IPv6 was designed to replace IPv4, offering a larger address space and improved features, and preference for IPv6 ensures a smooth migration path as the internet continues its transition away from IPv4.
IPv4 is not preferred in a dual-stack environment; the standard behavior is to prefer IPv6 when both addresses are available for a destination.
Concept tested: IPv6 preference in dual-stack address selection
Source: https://www.rfc-editor.org/rfc/rfc6724
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