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單項選擇題

Which issue or set of issues does the Lightweight Access Point Protocol （LWAPP） address？（）

A. reduction of processing in wireless controllers
B. distributed approach to authentication， encryption， and policy enforcement
C. provides security by blocking communication between access points and wireless clients
D. access point discovery， information exchange， and configuration

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單項選擇題

Refer to the exhibit. Which Virtual Router Redundancy Protocol （VRRP） statement is true about the  roles of the master virtual router and the backup virtual router？（）

A. Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails，  Router B will become the master virtual router. When Router A recovers， Router B will maintain the role of  master virtual router.
B. Router A is the master virtual router， and Router B is the backup virtual router. When Router A fails，  Router B will become the master virtual router. When Router A recovers， it will regain the master virtual  router role.
C. Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails，  Router A will become the master virtual router. When Router B recovers， Router A will maintain the role of  master virtual router.
D. Router B is the master virtual router， and Router A is the backup virtual router. When Router B fails，  Router A will become the master virtual router. When Router B recovers， it will regain the master virtual  router role.
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