What are two features of dual-stack? (Choose two.)

Question

Options

• AIt is implemented without excessive processing power.
• BIt supports IPv4 and IPv6 traffic on the same infrastructure.
• CIt allows an engineer to stack multiple Layer 2 switches to serve as a single switching unit.
• DIt requires tunneling IPv6 traffic over an IPv4 infrastructure.
• EIt securely routes and tunnels traffic between separate sites over the Internet.

• A
  92% (24)
• C
  4% (1)
• E
  4% (1)

Explanation

Dual-stack is an IPv4-to-IPv6 transition strategy where devices run both protocol stacks simultaneously on the same network infrastructure, making B its defining characteristic. It is also designed to be lightweight and efficient, meaning it does not require excessive processing power - making A correct as well.

Why the distractors are wrong:

• C describes switch stacking (e.g., Cisco StackWise), a physical/logical hardware feature unrelated to IP addressing.
• D describes tunneling (e.g., 6to4 or ISATAP), which is a different IPv6 transition mechanism - dual-stack avoids tunneling by running both protocols natively.
• E describes VPNs or site-to-site tunneling technologies, not dual-stack.

Memory tip: The word "dual" = two protocols (IPv4 + IPv6) running natively side by side on the same gear - no tunneling, no heavy lifting. If an answer mentions tunneling or stacking switches, it's describing something else entirely.

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