【2018.12.03】CCNP排错（300-135）题库V2.0

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jiashanpeng 发表于 2018-12-3 18:56
  n$ ^* G/ l, ~' x1 G6 z确实，这道题，两个版本答案不一样，期待乔帮主解决。

在300-135 offical cert guide，有兩題
3 O( T& T% P# Q$ j9 L
# ]5 @, h- Z# H% Y6 }7 a) J11. Which statements are true about GRE tunnels?
a. The original packet is encapsulated in a GRE header only.
3 i# _6 X5 _9 ]5 t0 G" y' fb. The original packet is encapsulated in a GRE header, and then a new IP header is
$ Y# t* n: `( J6 _6 g; i. L4 _. B9 xadded.
c. The original packet is encapsulated in an IP header, and then a GRE header is
% R9 ~' s8 ~6 a  U! @1 vadded.
! g) c5 ^% j) w- w1 pd. The original packet header is rewritten by the GRE header.
8 Z# ?# i) A9 h$ h% X0 D/ a答案是B
12. When creating a virtual tunnel interface, what is the default tunnel mode?
8 ?# P7 o$ B% }% g+ b: |a. GRE/IP
b. GRE/IPv6
c. IPv6/IP
d. GRE/Multipoint
) O' x. p3 C+ S1 P* g5 E答案是A
4 v- M% ]: `1 g" B( U
我認為GRE/IP為by default，GRE encapsulate original packet，加上new IP header是正確的，
9 r: P+ |" D) h2 b$ p& S所以選BC應該沒錯

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