k313106 发表于 2019-4-13 22:48:48

題庫的題目是不是錯了呀？

QUESTION 479
Which three approaches can be used while migrating from an IPV4 addressing scheme to an IPV6
scheme.(choose three)
A. statically map IPV4 address to IPV6 addresses
B. configuration IPv4 tunnels between IPV6 islands
C. use DHCPv6 to map IPV4 addresses to IPV6 addresses
D. use proxying and translation to translate IPV6 packets into IPV4 packets
E. configure IPV6 directly
F. enable dual-stack routing
題庫答案是ＡＢＦ
但應該是ＢＤＦ呀？不是嗎？


Which three options are types of slow VLAN connectivity? (Choose three.)
A. slow collision domain connectivityB. slow application domain connectivityC. slow routing domain connectivityD. slow inter-VLAN connectivityE. slow broadcast domain connectivityF. slow default gateway connectivity

這題Ａ和Ｅ已確定正確
但Ｂ的選項應該換成Ｄ比較好？
是嗎？

bzzz 发表于 2019-4-13 22:48:49

上面的問題, ABF 沒錯
dual-stack, tunnel and translation.
mapping is translation.   you dont need proxy.

jac19901112 发表于 2019-4-25 08:13:59

如版主上面的問題, 此題答案 ABF 沒錯

之前有看到類似版帖

nickjr 发表于 2019-5-28 14:46:03

Connecting IPv6 islands with tunnels
An IPv6 island is a network made of IPv6 links directly connected by IPv6 routers. In the early days of IPv6 deployment, there are many IPv6 islands.
IPv6 in IPv4 tunnels are used to connect those islands together. In each island, one (or more) dual stack routers are designated to encapsulate and decapsulate IPv6 packets within IPv4 packets. Different mechanisms have been developed to manage tunnels: automatic tunnels3, configured tunnels3, tunnel brokers3, 6over43, 6to43,…
Reference 2:
http://www.petri.co.il/ipv6-transition.htm
Network Address Translation – Protocol Translation (NAT-PT)
The NAT-PT method enables the ability to either statically or dynamically configure a translation of a IPv4 network address into an IPv6 network address and vice versa. For those familiar with more typically NAT implementations, the operation is very similar but includes a protocol translation function.
NAT-PT also ties in an Application Layer Gateway (ALG) functionality that converts Domain Name System (DNS) mappings between protocols.
Dual Stack
The simplest approach when transitioning to IPv6 is to run IPv6 on all of the devices that are currently running IPv4. If this is something that is possible within the organizational network, it is very easy to implement.
However, for many organizations, IPv6 is not supported on all of the IPv4 devices; in these situations other methods must be considered.
Reference: http://www.opus1.com/ipv6/howdoitransitiontoipv6.html
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