- 积分
- 92
- 鸿鹄币
- 个
- 好评度
- 点
- 精华
- 注册时间
- 2012-6-30
- 最后登录
- 1970-1-1
- 阅读权限
- 20
- 听众
- 收听
助理工程师
|
The network administrator is trying to add Switch1 to the network, but the 802.1Q trunk is not coming up. Switch1 was previously tested in the laboratory and its8 f; I* X( a& H. P$ o
trunk configuration worked fine. What are three possible causes of this problem? (Choose three)% E; D1 V8 m, F( G2 n" O
A. The trunking configuration mode on Switch1 is set to Off.
, V! M3 K9 {+ O1 ] {B. The trunking configuration mode on the other end is set to On.
}$ r7 m4 |/ {$ g" P9 a5 l5 `C. The trunking configuration mode on the other end is set to Desirable.) X* i" R* U9 y
D. Cisco Discovery Protocol is not running on the other end.2 L+ } ~1 v, U" Q; J
E. There is a VTP domain name mismatch.; Y: ?8 J W7 |; i8 n% ^/ |
F. Switch1 does not support 802.1Q.
0 y8 ~+ W3 p0 e. o) q* m
8 B' e$ r4 j1 @1 I之前的答案里都是CEF或BCE,不过我觉得应该是ACE" o$ U. z/ {3 b8 I( W3 W; O
$ e/ W( R' i3 L2 qA,在官网http://www.cisco.com/en/US/products/hw/switches/ps4324/products_tech_note09186a0080094713.shtml里提到off就是Puts the port into permanent non-trunking mode.
?$ t3 ]" o, G5 pB,如果对端为trunk=on,switch1除了off都能起trunk。因为选了A,所以这里认为switch1不会是off。那么B不对。
5 n1 p, u5 o! OC,如果对端为Desirable,switch1在on, desirable, 或 auto都能起trunk,那么如果switch是Nonegotiate ,那么就不能建立trunk
1 L0 Q3 J0 H2 ]6 Q! F6 m2 U/ MD,CDP和这个没关系
! j. U) m& f' Z# {4 B$ p8 y1 j: N! QE,VTP域名不一致将无法成功协商trunk。
) t" _2 }6 `3 \F,虽说不支持802.1Q当然不行,但从实际上看,cisco肯定支持1Q(我不知道哪款不支持)。另外在实验室环境测试是好的,我认为这里不会忽略掉1q的测试。2 z! t9 N) i# v
, m* K) I! E& P- G5 N T" N( B G( u" r/ E) A& a. m z6 x, x
|
|