RS 400-101 笔试题库 个别易混淆题 求证

mangangcs

目前有三道题，不知道该怎么选，求指教~~~~
" [* _0 b8 T% O9 O3 u  I
一：
* U: t2 ^1 L9 w: I4 g; |: R1 k0 KIn which two modes do IPv6-in-IPv4 tunnels operate? (Choose two.)
9 Y5 I6 Y4 v- D' M& d7 w4 CA. tunnel mode
$ F/ a1 w/ N+ a6 L$ }, w- FB. transport mode
1 B' V% f* g. V; k+ o5 yC. 6to4 mode
' H- q/ z. C* `4 F6 Y- eD. 4to6 mode
/ G- H& w. K% ?* k# {/ Y9 pE. ISATAP mode

2 e6 t, N, J$ tQ986 Q1096这道题选AB    Q50里面选CE


二：
) @. k$ @9 f; s% ^# D还有这道：
Which statement about NAT64 is true?
1 O$ x; W4 d7 UA. NAT64 provides address family translation and translates IPv4 to IPv6 and
IPv6 to IPv4.
B. NAT64 provides address family translation and can translate only IPv6 to
: P, J0 d4 Q, m6 AIPv4.
C. NAT64 should be considered as a permanent solution.
. O' {$ d$ X0 GD. NAT64 requires the use of DNS64

有的题库选A，有的选B   ，能看懂的同学，给详细解释一下吧

) S* Q4 D1 n' ^& W三：
还有一道Q22里面的题：
- H7 f  w4 D3 P0 k. Vwhat are two requirements for NSF operation in an MPLS L3 VPN?
) _" }* G: T" N: o. tA.SSO must be active
B.Graceful restart must be configured in BGP
C.Stateful HA must be deployed
1 i, U0 q+ ^" d" J! ]% OD.ISSU must be active
E.The NSF must bve configured for Layer 2 traffic
/ s  ?0 K( `+ Y8 {* N( C& ZF.Graceful restart must be configured in LDP

: D* B; p* m6 x( F8 W3 c# \, M6 U这道题Q1069里面选AD    Q22里面选的是BF

mangangcs

顶顶顶顶顶~~~~~~~~~~~~

luopoxy

同求 NAT64 这题确实有2种答案，求高手解答