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10鸿鹄币
本帖最后由 bei612 于 2014-5-1 23:49 编辑
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问题已经解决
5 r. z# q; p0 H' z; T8 U2道题都是关于DTP的，请问2端口DTP是否协商成为trunk又和VTP有什么关系？
: b/ q4 K2 }& O5 h' N. ]4 @switchport mode 后面什么时候能跟on 和 off 了？
1 z5 W- U' \, m" y. @' M% R* ^还有怎么理解“trunk is not comming up”？
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QUESTION 42
" D+ n$ E* Y6 j* fThe network administrator is trying to add Switch1 to the network, but the 802.1 Q trunk is not coming up. Switch1 was previously tested in the laboratory and itstrunk configuration worked fine. What are three possible causes of this problem? (Choose three.)
Z' A( W3 H' {, pA. The trunking configuration mode on Switch1 is set to Off.
) Q: p: D8 o4 T0 Y5 P& X0 q f ?8 JB. The trunking configuration mode on the other end is set to On.
( y1 Q. V" I) FC. The trunking configuration mode on the other end is set to Desirable.
0 y/ E0 I; ]4 n+ B1 y% TD. Cisco Discovery Protocol is not running on the other end.9 T- ~" j9 W0 a7 y2 h5 p& |' J I
E. There is a VTP domain name mismatch.
9 U v1 X5 P3 V+ ?# j" Z0 f/ OF. Switch1 does not support 802.1Q.
/ Q! w7 f( g; ~: \' ?$ DCorrect Answer: AEF
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5 ~0 r+ n4 J, bQUESTION 448 q0 v9 u. V/ H0 d5 |8 o7 i. G" O
An 802.1Q trunk is not coming up between two switches. The ports on both switches are configured as "switchport mode desirable." Assuming that there is nophysical issue, choose two possible causes. (Choose two.)$ l: i* M( z* R, J4 E: B
A. Incorrect VTP domain+ U" x3 Q: V# i" r9 H W
B. Incorrect VTP password+ z; w' M! m) D& [4 ~
C. Incorrect VTP mode9 o4 l0 x: f: w f$ z/ o c9 i7 S4 h% m1 V
D. Incorrect VTP configuration revision0 C n+ w* u4 ?
Correct Answer: AB
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刚看了国外题库的答案：/ A7 b. g/ o' B& E* d
On: sets the port to permanent trunking mode5 \6 Q# ~& f* M% m$ y2 t
Off: sets the port to permanent non-trunking mode% l1 I+ D+ v$ @3 Y0 E2 n
这样B,C就排除了
$ H; ?$ h4 z" |. A. ?而VTP确是和DTP协商有关系：) N+ P: K# t+ |
If your VTP domains do not match on each side of a trunk link, then DTP will NOT work. You need to watch out for this as the ports will be up/up, but trunking will not be negotiated. You’ll need to either make both VTP domains the same, or hard-set the trunks with “switchport nonegotiate”.
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In this example, one side of the trunk is in VTP domain CCIE, and the other is in VTP domain FAILED:+ H* v( H* C' f1 W8 k- m5 u
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sw1(config-if-range)#^Z
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*Mar 1 05:58:26: %SYS-5-CONFIG_I: Configured from console by console
( a3 y- H6 Z. h% G% e E *Mar 1 05:58:27: %LINK-3-UPDOWN: Interface FastEthernet0/13, changed state to up" A1 I# C5 X( ?0 g* \+ }$ j' P
*Mar 1 05:58:27: %LINK-3-UPDOWN: Interface FastEthernet0/14, changed state to up
& Q2 ^. U8 k. [$ [ *Mar 1 05:58:27: %LINK-3-UPDOWN: Interface FastEthernet0/15, changed state to down
w- r) H$ V+ |) Q *Mar 1 05:58:28: %DTP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port Fa0/13 because of VTP domain mismatch.3 t0 b+ y) u( u* B4 n0 M) c7 m
*Mar 1 05:58:28: %DTP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port Fa0/14 because of VTP domain mismatch./ P" R$ \% G" X2 M
*Mar 1 05:58:28: %DTP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port Fa0/15 because of VTP domain mismatch.
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最佳答案
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楼主理解错误了，这里不是说是on，off这种开关的意思~on Switch1 is set to Off意思是，在SW1上，Trunk的动态协商是关闭的
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发表于 2014-5-1 16:11:18
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