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初级工程师
  
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发表于 2019-11-16 18:28:11
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HSRP这道CASE题第4小问选哪个啊,我看之前的视频是选B,最新的题库选的是C,R4和R5为啥会有DHCP的问题,有点不明白,有大神讲解一下吗
& S! Y( }+ m2 F( H8 xQUESTION 48 E. @! U7 e0 l
Examine the configuration on R5. Router R5 do not see any route entries learned from R4; what could be
5 ~ F, h' ]+ L6 B5 K9 W% w9 sthe issue?
' R. a3 D: y2 i7 ~" d3 j3 nA. HSRP issue between R5 and R4% ?! Y' f) u0 m6 r" A
B. There is an OSPF issue between R5and R4
; r1 m: D! d5 G3 X% `/ w+ XC. There is a DHCP issue between R5 and R40 j' ]1 Y4 \8 `" H9 j
D. The distribute-list configured on R5 is blocking route entries
7 J; V$ r4 z- U: T# A) [5 bE. The ACL configured on R5 is blocking traffic for the subnets advertised from R4.
) C; |3 Z y/ l$ ?3 y, aCorrect Answer: C
) g6 L, Z5 s+ n' {Section: (none)
8 q7 I) ^2 l! j0 h4 UExplanation
3 l" z6 i/ I! S8 X: CExplanation/Reference:- T. q; W- l$ ^: Q
R5 configuration :-. U7 I6 E% m2 O& A) Y$ E( ^- U$ I7 {
int gig0/0( M% @2 {! y7 c5 v2 r. V
ip address dhcp
1 ]1 m( X* H& u6 LThis interface not getting dhcp ip address from R4. So even though OSPF configuration was like 0.0.0.0! f, C9 y, v; r$ y4 z u) p
0.0.0.0 area 0 , because this interface does not get correct ip address from DHCP it can’t participate in; u- e$ W$ m/ [, ?4 G
OSPF.
0 U; |- C( k4 x3 u3 d4 n0 r+ y6 GR4 configuration :-
" ~/ |% h. U' lip dhcp exlude address
: E; U3 c2 m' ` [. ~ip dhcp pool ine4 Q4 r) k1 `- J7 E
network x.x.x.x x.x.x.x
# I# `9 ~( B( P; K6 |" ki think default router command was missing here . not sure
4 D% ? s& P7 K$ n9 R0 @but& r8 `7 e7 Y. j8 q6 E
Int gig0/0- f+ U) y, u4 x- V: q4 `+ ^6 _
ip address dhcp .3 \7 z1 E/ c4 B8 o; P
This interface on R4 should have ip address configured on it instead of ” ip address dhcp ” . Hence its not
3 }7 g. ?& U# |) Uable to provide dhcp lease address to R5.1 a; _7 H- f3 }
R4 also had ospf configured as network 0.0.0.0 0.0.0.0 area 0. So all interface can participate if they are1 A8 @5 ^2 V0 p; A/ }
up and if they have ip address.
$ P4 x% b3 u7 C2 } R. h: y4 qBut because R5 interface connected to R4 could not obtail correct dhcp ip address from R4 due to DHCP
. d% F' l1 Y; u* C: ^) sissue they wont form ospf neighborship., D3 R- l1 Q5 ]1 }/ `$ b
So correct answer is DHCP issue between R5 & R4. |
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