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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 its
! \# ^- f- S- I+ L0 atrunk configuration worked fine. What are three possible causes of this problem? (Choose three)9 b' ^2 p5 x1 V. s" f* K- K
A. The trunking configuration mode on Switch1 is set to Off.( h, r. v7 t! d7 l
B. The trunking configuration mode on the other end is set to On.
+ `- y2 t4 M1 W0 `( yC. The trunking configuration mode on the other end is set to Desirable.
8 N7 ~' Y- e, n! W FD. Cisco Discovery Protocol is not running on the other end.) J) j7 g. w0 o! `
E. There is a VTP domain name mismatch.7 P$ c; S) K+ }6 C
F. Switch1 does not support 802.1Q.
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4 w4 q# F: t1 I之前的答案里都是CEF或BCE,不过我觉得应该是ACE/ y/ b& L4 ^3 V: r8 S4 m# D# @
- h+ T& H) f7 U2 f+ e) T& sA,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. ! B0 ?, n, O; J! f% {! S
B,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。
2 x" J0 h, A3 G! \# @) l0 i; MC,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! R# `( V" X9 w% d; `
D,CDP和这个没关系, G9 i6 F! n8 i% g3 p; y/ b
E,VTP域名不一致将无法成功协商trunk。
' J! |' o0 |+ E1 M+ h- E+ G) X; [0 rF,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。: p P9 F+ t. G
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