Cisco 300-101 Question Answers

300-101 Question 5

Which method allows IPv4 and IPv6 to work together without requiring both to be used for a single connection during the migrati
on process?


A. dual-stack method
B. 6to4 tunneling
C. GRE tunneling
D. NAT-PT


Correct Answer: A
Explanation/Reference:
Dual stack means that devices are able to run IPv4 and IPv6 in parallel. It allows hosts to simultaneously reach IPv4 and IPv6  content, so it offers a very flexible coexistence strategy. For sessions that support IPv6, IPv6 is used on a dual stack endpoint. If both endpoints support IPv4 onl y, then IPv4 is used. Benefits:
 . Native dual stack does not require any tunneling mechanisms on internal networks
 . Both IPv4 and IPv6 run independent of each other
 . Dual stack supports gradual migration of endpoints, networks, and applications.
Reference: http://www.cisco.com/web/strategy/docs/gov/IPV6at_a_glance_c45-625859.pdf