【汇总】CCNP最新题库（大虾专用导航） 不断更新~~

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qiansipan

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augustine55

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asmiller

QUESTION 335
Which two statements about the various implementations of STP are true? (Choose two.)
9 C3 ~" F( y; t( b+ w. QA. Common Spanning Tree maintains a separate spanning-tree instance for each VLAN configured in the
+ v: r; w$ d; D( c/ b  ]network.
, t  k! f0 _' g  cB. The Spanning Tree Protocol (STP) is an evolution of the IEEE 802.1w standard.
C. Per-VLAN Spanning Tree (PVST) supports 802.1Q trunking.
! Q4 J( t1 `/ |  g0 D3 X3 PD. Per-VLAN Spanning Tree Plus(PVST+) is an enhancement to 802.1Q specification and is supported
only on Cisco devices.
E. Rapid Spanning Tree Protocol (RSTP) includes features equivalent to Cisco PortFast, UplinkFast, and
- p" J  c" V* b8 H8 QBackboneFast for faster network reconvergence.
F. Multiple Spanning Tree (MST) assumes one spanning-tree instance for the entire Layer 2 network,
6 w3 d8 `* q8 u! D$ ?regardless of the multiple number of VLANs.
3 C' f& D0 C; u& CAnswer: DE
Section: Mixed Practice Questions 5
- m+ y* r  Q+ N1 L' `8 p  Q  u/ yExplanation/Reference:
PVST+对802.1D改进，只有CISCO设备支持。D选项的802.1Q有笔误，要改成802.1D。
) U- R( Y: Q* s4 U9 f7 |- \8 QMST使用instance，一个instance映射多个VLAN。
这一题的答案跟解释不符合。按解释选择的话应该选的是D,F

4 c; F' G4 T, y- c不知哪位高手能告诉我一下。谢谢