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【单项选择题】

Which of these statements best describes VPLS?（）

A、A. Neither broadcast nor multicast traffic is ever flooded in VPLS.

B、B. Multicast traffic is flooded but broadcast traffic is not flooded in VPLS.

C、C. VPLS emulates an Ethernet switch, with eachEMS being analogous to a VLAN.

D、D. Because U-PE devices act as IEEE 802.1 devices, the VPLS core must use STP.

E、E. When the provider experiences an outage, IP re-routing restores PW connectivity and MAC relearning is needed.

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第3题
[多选题] Which two of these are advantages of placing the VPN device in the DMZ on the firewall?（）

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第4题
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第5题
[多选题] Which two of these statements regarding RSTP are correct? （）

A、RSTP cannot operate with PVST+.  B、RSTP defines new port roles.  C、RSTP defines no new port states.  D、RSTP is a proprietary implementation of IEEE 802.1D STP.  E、RSTP is compatible with the original IEEE 802.1D STP.  

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第6题
[多选题] Which two of these statements regarding RSTP are correct? （）

A、RSTP cannot operate with PVST+.  B、RSTP defines new port roles.  C、RSTP defines no new port states.  D、RSTP is a proprietary implementation of IEEE 802.1D STP.  E、RSTP is compatible with the original IEEE 802.1D STP.  

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第7题
[多选题] Which two of these statements regarding RSTP are correct?（）

A、RSTP cannot operate with PVST+.  B、RSTP defines new port roles.  C、RSTP defines no new port states.  D、RSTP is a proprietary implementation of IEEE 802.1D STP.  E、RSTP is compatible with the original IEEE 802.1D STP.  

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第8题
[单选题] These are the principles（）alone a new world recognizing the brotherhood of man and the fatherhood of God can be established.

A、for which  B、in which  C、upon which  

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第9题
[多选题] The statements below compare and contrast link state and distance vector routing protocols. Which of these are true?（）

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第10题
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