【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
9 ?9 ]- Q2 a4 s$ H: a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

+ w9 l$ @7 T" d; b3 P11. Which statements are true about GRE tunnels?
a. The original packet is encapsulated in a GRE header only.
b. The original packet is encapsulated in a GRE header, and then a new IP header is
added.
1 n$ ?; c- v$ U. ]0 Dc. The original packet is encapsulated in an IP header, and then a GRE header is
/ g$ l9 I# j8 B& B3 b5 N2 Sadded.
" H- H1 V* Q* i8 Q1 ld. The original packet header is rewritten by the GRE header.
答案是B
12. When creating a virtual tunnel interface, what is the default tunnel mode?
' \+ z" X' t8 f' k3 _) ?* p' q) sa. GRE/IP
4 B2 h! ?6 S( d0 z/ z$ H( I" Wb. GRE/IPv6
2 x( ~3 |+ [% E) [% ]  Q; P5 k) B8 Lc. IPv6/IP
d. GRE/Multipoint
答案是A
7 O  N$ Y/ m, `6 g0 i* y
我認為GRE/IP為by default，GRE encapsulate original packet，加上new IP header是正確的，
所以選BC應該沒錯

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