关于第八次更新的一道题目

aizheni2011

用VCE测试pdf里给的答案是BDF，vce里是ABF,哪个对啊？

thegodfather

楼主看这儿
http://bbs.hh010.com/forum.php?m ... 4&fromuid=24897

aizheni2011

回复 thegodfather 的帖子

谢谢哈~~

allencheng

BDF
大家在Google 英文中search ipv6, check this link:

http://en.wikipedia.org/wiki/IPv6#Dual_IP_stack_implementation 有一段话：

Proxying and translation for IPv6-only hosts
Main article: IPv6 transition mechanisms
After the regional Internet registries have exhausted their pools of available IPv4 addresses, it is likely that hosts newly added to the Internet might only have IPv6 connectivity. For these clients to have backward-compatible connectivity to existing IPv4-only resources, suitable IPv6 transition mechanisms must be deployed.

One form of address translation is the use of a dual-stack application layer proxy server, for example a web proxy.

NAT-like techniques for application-agnostic translation at the lower layers in routers and gateways have been proposed. The NAT-PT standard was dropped due to a number of criticisms,[42] however more recently the continued low adoption of IPv6 has prompted a new standardization effort under the name NAT64.
所以我认为D是对的

angch

D怎麼會是對的?題目不是要求由IPv4到IPv6嗎?而D選項把V6崁入V4與題意剛好相反.