What are three requirements for a static IPv6-in-IPv4 tunnel? (Choose three.)

Question

Options

• AA static IPv6 address must be configured.
• BA dynamic IPv6 address must be configured.
• CCisco Express Forwarding must be enabled.
• DEach tunnel endpoint must support IPv4 and IPv6.
• EA static IPv4 address must be configured.
• FA dynamic IPv4 address must be configured.

• A
  87% (53)
• B
  8% (5)
• C
  3% (2)
• F
  2% (1)

Explanation

A static IPv6-in-IPv4 tunnel (also called a manual tunnel or configured tunnel, per RFC 4213) encapsulates IPv6 packets inside IPv4 packets for transport across an IPv4 network. A is correct - A static IPv6 address must be assigned to the tunnel interface so that IPv6 packets can be forwarded into it. D is correct - Both tunnel endpoints (source and destination routers) must run a dual-stack configuration supporting both IPv4 and IPv6, since they must understand both protocols to encapsulate/decapsulate traffic. E is correct - Static IPv4 addresses are required for both the tunnel source and tunnel destination, as the IPv4 addresses define the tunnel endpoints; dynamic IPv4 addresses are not supported in static tunnel configurations. Option B (dynamic IPv6) is incorrect - dynamic addresses are used in automatic tunneling mechanisms (6to4, ISATAP), not static tunnels. Option C (CEF) is not a strict requirement for tunnel operation, though it aids performance. Option F (dynamic IPv4) is incorrect for the same reason as B.

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