300-101的493题答案是不是错的？（3.29版）

邪玩哒 · 发表于 2018-3-30 16:17:06

我看了下感觉不太对，自己用GNS3模拟了下

R4#show ip route
1 o' c3 t7 W9 G6 u; i5 t: t5 ~Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP3 n0 {8 W9 P# V7 B- Y; X' E
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
, s; E$ O3 t4 ]/ }0 g    N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
) W8 i" B" X$ o  m: x    E1 - OSPF external type 1, E2 - OSPF external type 2
1 W. t9 X( Q' M    i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
( w& ?1 r& C: X& c# F+ A    ia - IS-IS inter area, * - candidate default, U - per-user static route. u" ?; {! |: U( l& |
   o - ODR, P - periodic downloaded static route& T+ i3 P$ G; E! y1 B
* Y2 q3 L+ f% {1 j
Gateway of last resort is not set# H) h7 U" k( o# z9 j
& c- R$ `+ V' m7 S
   34.0.0.0/24 is subnetted, 1 subnets
8 a2 c- j' ~, [5 I+ MC    34.1.1.0 is directly connected, FastEthernet1/0
, F; \9 _: w! N7 v0 w$ S! ]2 C" r    1.0.0.0/24 is subnetted, 1 subnets" X4 p5 W7 p3 n+ Z6 W
D    1.1.1.0 [90/158720] via 34.1.1.3, 00:00:24, FastEthernet1/0
: D" v6 I+ W4 x. }+ ?- T' y4 d             [90/158720] via 24.1.1.2, 00:00:24, FastEthernet3/0
- C& J9 O% X6 l6 X  B( Y8 l. I    2.0.0.0/24 is subnetted, 1 subnets4 o* ~- |. F) r
D    2.2.2.0 [90/156160] via 24.1.1.2, 00:00:23, FastEthernet3/0
: f9 H& s) K5 H' e    3.0.0.0/24 is subnetted, 1 subnets: \0 U1 S) \3 J
D    3.3.3.0 [90/156160] via 34.1.1.3, 00:00:23, FastEthernet1/0
5 D  H- \( U+ u' X" b) p/ U    4.0.0.0/24 is subnetted, 1 subnets
6 i1 D8 E+ G8 A  o" {, DC    4.4.4.0 is directly connected, Loopback0
. h, r3 M- F3 y. |( l1 [    24.0.0.0/24 is subnetted, 1 subnets
! ^! ]( f) f- _* p; n2 q2 kC    24.1.1.0 is directly connected, FastEthernet3/0
8 t4 J& I% Z9 K, e8 I; }- |    12.0.0.0/24 is subnetted, 1 subnets
: w1 v" Z9 {5 D8 K5 ~& ~D    12.1.1.0 [90/30720] via 24.1.1.2, 00:00:30, FastEthernet3/0
( E: ~! @! P2 |6 b3 k- Q8 w! E    13.0.0.0/24 is subnetted, 1 subnets
' g0 I; j# n, m- W! BD    13.1.1.0 [90/30720] via 34.1.1.3, 00:00:30, FastEthernet1/03 n+ v8 \6 Q. T! m, ]
4 L9 z8 B- M9 H

4 x* I0 X* `' M5 M- y' M- V. W- X& W* E( S3 I7 P# o
R4(config-router)#distance 89 24.1.1.2 0.0.0.0
, z8 }1 \- b8 q$ z& y- N
  d5 R& }" @, h  B3 [! K) Y- P. J' p
R4#show ip route 7 E8 x/ P8 C- C9 k& Y
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
7 Y! m1 q6 A1 \; v" M& C# q    D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area ; a1 Q9 Z3 a. Z2 Y# I
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2. y6 L9 n: }8 b/ C/ `4 a  P
   E1 - OSPF external type 1, E2 - OSPF external type 2
$ `8 X- {7 _" [    i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
6 F+ s, D: A+ v1 `    ia - IS-IS inter area, * - candidate default, U - per-user static route& A% _; [8 z" M
   o - ODR, P - periodic downloaded static route
* X5 J7 v0 P; v1 b0 r& J" g* K2 O' C9 h
Gateway of last resort is not set
' X2 o3 d' ?( z9 ^! C8 }4 Y/ e; ?. X5 u3 j
   34.0.0.0/24 is subnetted, 1 subnets$ A. s) V1 f. K! m- h
C    34.1.1.0 is directly connected, FastEthernet1/0. C7 g2 I5 I( l( P
   1.0.0.0/24 is subnetted, 1 subnets) S, q. D: O6 v5 g! Y3 [
D    1.1.1.0 [89/158720] via 24.1.1.2, 00:00:08, FastEthernet3/0
- L: p- H+ J4 o: B1 T    2.0.0.0/24 is subnetted, 1 subnets" l- }/ z# ?5 `3 Q- X$ Y
D    2.2.2.0 [89/156160] via 24.1.1.2, 00:00:07, FastEthernet3/0
* O! H( @' @: @, c. ?! j    3.0.0.0/24 is subnetted, 1 subnets# x3 {, a* T7 m% O! ?5 H
D    3.3.3.0 [89/161280] via 24.1.1.2, 00:00:08, FastEthernet3/0
5 L+ [. \, l! a0 L  n    4.0.0.0/24 is subnetted, 1 subnets
2 r" f+ H  {) wC    4.4.4.0 is directly connected, Loopback0) k+ N1 E  R  c- |, F
   24.0.0.0/24 is subnetted, 1 subnets5 }$ r! ~9 y1 [, h
C    24.1.1.0 is directly connected, FastEthernet3/0% y" V. W0 o5 P* t) A# A
   12.0.0.0/24 is subnetted, 1 subnets8 T! a" h! _9 I7 P( x8 g: a/ ?- D
D    12.1.1.0 [89/30720] via 24.1.1.2, 00:00:29, FastEthernet3/0  p# S9 K) Q2 u$ m- \4 ?
   13.0.0.0/24 is subnetted, 1 subnets
5 p' C5 ]3 I" P1 oD    13.1.1.0 [89/33280] via 24.1.1.2, 00:00:29, FastEthernet3/0

同时发现R2上面到3.3.3.3也不再负载均衡，不知道为啥。

anubis_amon · 发表于 2018-3-30 17:28:00

这道题我感觉不是用实验去验证的事，是英文理解的问题。题目既然说的是 51那条路由 prefer over 52那条路由，我也询问过在国外留学的人，都说题目的意思就是说要选路51那条，那就应该改小51路由的AD值，但是答案给的是减小52路由的AD值。

anderscai · 发表于 2018-3-31 04:55:52

题目的要求就是不再要负载均衡，修改AD值后，就会走R2-R4 。

邪玩哒 · 发表于 2018-3-31 09:50:27

anderscai 发表于 2018-3-31 04:55
4 N0 A: {% z& R/ v- u题目的要求就是不再要负载均衡，修改AD值后，就会走R2-R4 。

题目要求是优选51那条路，如果只是不要负载均衡，正确的答案就有好几个了

邪玩哒 · 发表于 2018-3-31 09:58:18

原题：

The excerpt was taken from the routing table of router SATX. Which option ensures that routes from
$ c2 G5 f( D4 b" R4 e6 A51.51.51.1 are preferred over routes from 52.52.52.2?) a6 L4 z* c0 V8 j2 Z
A. SATX(config-router)#distance 90 51.51.51.10.0.0.03 [/ x# B8 \0 O& A O% u! X( s+ U4 O
B. SATX(config-router)#distance 89.52.52.52.2 0.0.0.0) @: B( b+ m5 o2 g" _
C. SATX(config-router)#distance 90.52.52.52.2 0.0.0.0( G3 z2 f L6 I0 k7 ?2 H6 V9 @
D. SATX(config-router)#administrative distance 91 51.51.510.0.0.0! \' D. B) r1 @; x) R
E. SATX(config-router)#distance 89 51.51.51.10.0.0.0
+ n7 R) m" w9 C& rF. SATX(config-router)#administrative distance 91 52.52.52.2 0.0.0.0
! y( t1 ]1 \: c
3 x& a% e! l- d) C% {" l3 T* `Correct Answer: B* ~' `4 ^% j4 v4 C( S# I, o9 ?/ {$ g
Section: part 10
3 L8 c- i5 v& T0 O, @& W+ ~& PExplanation

anderscai · 发表于 2018-4-3 04:10:31

是啊，既然R2-R4优先，那就没LB什么事了，什么情况都走优的。

~777~ · 发表于 2018-4-7 18:40:50

來參考一下~~

Hosea178 · 发表于 2018-4-21 12:01:09

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水水水水水水 · 发表于 2018-5-9 14:55:38

给力

deanke · 发表于 2018-6-26 09:19:17

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[其他] 300-101的493题答案是不是错的？（3.29版）

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