請教300-115的一題考題的正解

1738t

請教一下，下面答案的正解是BC還是BE
Which statements about RSPAN are true? (Choose two.)
A. It supports MAC address learning.
* r' g% P& n& O! z. [1 ~B. RSPAN VLANs can carry RSPAN traffic only.
C. Only one RSPAN VLAN can be configured per device.
' N/ E! p* R- F7 RD. RSPAN VLANs are exempt from VTP pruning.
E. MAC address learning is not supported.
, H" y+ j1 [. R" ]# J/ {4 jF. RSPAN uses are GRE tunnel to transmit captured traffic.
1 c# }" k8 p$ c- T( }, @4 X

siukai

我認為是BE

RSPAN VLAN
$ R7 |7 i; O. |The RSPAN VLAN carries SPAN traffic between RSPAN source and destination sessions. It has these special characteristics:

; L4 s8 N. C/ C$ v7 h, U7 f•All traffic in the RSPAN VLAN is always flooded.

, e/ @. h$ t1 E2 w1 [: K•No MAC address learning occurs on the RSPAN VLAN.

: }0 X1 z  Y9 q, J+ a•RSPAN VLAN traffic only flows on trunk ports.
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•RSPAN VLANs must be configured in VLAN configuration mode by using the remote-span VLAN configuration mode command.

•STP can run on RSPAN VLAN trunks but not on SPAN destination ports.
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* L4 M' S: K- @9 Y3 @% A3 L* z•An RSPAN VLAN cannot be a private-VLAN primary or secondary VLAN.
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! \# X1 G' V# J8 {- xFor VLANs 1 to 1005 that are visible to VLAN Trunking Protocol (VTP), the VLAN ID and its associated RSPAN characteristic are propagated by VTP. If you assign an RSPAN VLAN ID in the extended VLAN range (1006 to 4094), you must manually configure all intermediate switches.

It is normal to have multiple RSPAN VLANs in a network at the same time with each RSPAN VLAN defining a network-wide RSPAN session. That is, multiple RSPAN source sessions anywhere in the network can contribute packets to the RSPAN session. It is also possible to have multiple RSPAN destination sessions throughout the network, monitoring the same RSPAN VLAN and presenting traffic to the user. The RSPAN VLAN ID separates the sessions.
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+ \3 {& }8 W" thttps://www.cisco.com/c/en/us/td ... 3560scg/swspan.html

超人小尼玛

B E

bbsboy

All traffic in the RSPAN VLAN is always flooded.
: _- u/ v$ _& |7 @2 M2 ZNo MAC address learning occurs on the RSPAN VLAN.
% l% I4 T/ O  ^3 ?) e0 ^1 }RSPAN VLAN traffic only flows on trunk ports.
RSPAN VLANs must be configured in VLAN configuration mode by using the remote-span VLAN configuration mode command.
STP can run on RSPAN VLAN trunks but not on SPAN destination ports.
An RSPAN VLAN cannot be a private-VLAN primary or secondary VLAN.
1 _3 s+ r! E3 l3 `/ [: q) }For VLANs 1 to 1005 that are visible to VLAN Trunking Protocol (VTP), the VLAN ID and its associated RSPAN characteristic are propagated by VTP. If you assign an RSPAN VLAN ID in the extended VLAN range (1006 to 4094), you must manually configure all intermediate switches.
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* g5 N7 Y0 `% uIt is normal to have multiple RSPAN VLANs in a network at the same time with each RSPAN VLAN defining a network-wide RSPAN session. That is, multiple RSPAN source sessions anywhere in the network can contribute packets to the RSPAN session. It is also possible to have multiple RSPAN destination sessions throughout the network, monitoring the same RSPAN VLAN and presenting traffic to the user. The RSPAN VLAN ID separates the sessions.
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" B: Z; P& E$ y$ H& @1 }' }9 QBE

1738t

siukai 发表于 2018-1-24 11:05
我認為是BE

RSPAN VLAN

; f& f6 |$ F& u) z' u8 Z' ?! Q感謝您的解惑感謝！

1738t

bbsboy 发表于 2018-1-24 12:56
4 T8 i- v- P. D, L; |( [7 ?1 uAll traffic in the RSPAN VLAN is always flooded.
No MAC address learning occurs on the RSPAN VLAN.
...

1 ?- p+ X7 k( R! M% d' X感謝您的解惑感謝！

1738t

超人小尼玛 发表于 2018-1-24 11:44
B E

感謝你

永无止境注册了

我认为应该是BE  
% L  P1 `0 Y5 p  `2 K4 Q" S, cF，说的是 ERSPAN
/ k- A- {8 s  D" WD,  VTP pruning 会修剪 端口，这个我在web-iou 上做实验验证的（没有真机环境，各位有环境的做个试验）
C, 真机3560上我可以配置多个RSPAN VLAN  。 可以配置2个 RSPAN vlan 的monitor seesion
" ~2 d: [0 z' kA和E ，   相互矛盾，肯定选一个，那就是E了，不能学习mac
% [. @) U5 p1 E* z& W2 }. UB，只能选他了。  但是RSPAN vlan 不仅仅支持RSPAN vlan，我认为在trunk端口上还支持 STP（个人观点）。这个选项也有点问题。
% F" B3 {8 s) P) L6 I' `第402题选择正确的，答案排除了 D选项  RSPAN VLAN does not support any protocols 。
1 _1 ?  y: }$ I  v8 z第293题，答案是C,  而A选项是 . RSPAN VLAN does not support any protocols  没有选择
           B选项和本题的C选项一样，也没有选择，B. On a switch there can be only one RSPAN VLAN  
只能选BE了，有可能我的理解错了， 有可能题出的不严谨，有可能是题库拍的不全，有可能是誊写的时候疏忽。好在1-2题只会影响到满分，不会影响到通过