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To determine which version to use when sending a packet to a destination, the source host queries which of the following?

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To determine which version to use when sending a packet to a destination, the source host queries which of the following?

(a) Dual stack

(b) Domain Name Server

(c) Header information

(d) Transport layer

This question was addressed to me in semester exam.

My doubt stems from Transition from IPV4 to IPV6 in section TCP/IP Protocol Suite of Computer Network

1 Answer

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The correct answer is (b) Domain Name Server

Easy explanation: Source host queries DNS to determine which version to use when sending a packet to a destination. The DNS contains both, the IPv4 and IPv6 addresses of the modern dual stack host servers.

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