請問 300-101 題庫（2017.5.12 ) 的 Q202.222.228

javie

QUESTION 202
When unicast reverse path forwarding is configured on an interface, which action does
the interface take first when it receives a packet?
. y$ f! n. D# WA. It check the ingress access list
6 k, m6 V/ \1 m/ `# F7 b& xB. It check the egress access list
0 P1 Z2 ^+ Y0 z( _; zC. It verifies that the source has a valid CEF adjacency
) [5 a# _( y' N3 @D. It verifies a reverse path via the FIB to the source
Correct Answer: A
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QUESTION 222
What’s uRPF checking first when the packet enters the interface ? or when unicast reverse patch
$ M1 c) C  a1 Q- Gforwarding is configured on interinterface.
1 z. v, L1 a4 ^7 ?7 ^8 m2 XA. it check the ingress access list
/ m% o9 ~7 r9 o) {B. it check the egress access list
( \7 Q8 \1 m) _& z5 aC. Route available in FIB ot it verifies a reverse patch via the fib to the source
D. it verify that the source has a......
, v, B# W% ?# QCorrect Answer: C
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2 ^3 U9 r- i' R. j- i5 ZQUESTION 228
4 v& w* A! ~4 O' z/ y( }# d) bWhen unicast reverse path forwarding is configured on an interface, which action does the interface
7 f/ {1 F: K& V- i9 c) F% y# e" Ztake first when it receives a packet?
4 e$ {7 u6 @( q" CA. it verifies that the source has a valid VEF adjacency.
6 k/ F, Z: e8 Z( |; h* v% Z$ XB. It checks the egress access lists.
. a  }5 @7 `# i1 P) J/ V5 dC. it verifies a reverse path via the FIB to the source.
D. It checks the ingress access lists.
7 h  l& D0 z$ h( rCorrect Answer: C

* R, m: T, Y/ P# H% ?5 m( k6 N+ D這三題意思是一樣的吧？為何 Q202 答案和其他兩題不同
而且 Q202 和 Q228 題目完全一樣答案卻不同
我的認知是選「It checks the ingress access lists.」
- A$ T" }* W0 o' |請版上先進解惑~謝謝
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killu0008

推一個~! 近期要考 感謝大大幫忙整理

smilemhfish

可以参考下闫辉老师最新的路由视频，Q202选D

javie

感謝回覆

weng200504546

smilemhfish 发表于 2017-5-24 21:25
可以参考下闫辉老师最新的路由视频，Q202选D

三个都选择这个答案吗？