Session 1: IPv6 Flashcards
Why did the change from IPv4 to IPv6 happen so much faster in India than other countries?
Most of the users in India use mobile devices, which is a lot easier to translate to IPv6, since they don’t have legacy applications
Do applications need to be aware of running over IPv6?
To make full use of IPv6 yes, but in most cases no.
What happens when an IPv6 using client needs to communicate with an IPv4 only server?
The client makes the request in an IPv6 format as usual, but along the way NAT64 (DNS64 for DNS requests) translates the IPv6 request to an IPv4 request. The response then gets translated from IPv4 to IPv6 for the client.
(Fun fact, not part of syllabus) How many IPv6 addresses are there you think?
42,535,295,865,117,307,932,921,825,928,971,026,432 (forty-two unidecillion) IPv6 addresses, or about six octillion for each person on the planet.
Which elements got removed in the name of efficiency compared to IPv4?
Option field got replaced by extension header mechanism (which only gets added to packet if really necessary), header checksum removed, no fregmentation at intermediate nodes (except through extension headers) and ARP is no longer needed, integrated stateless address autoconfiguration also takes care of mapping.
