下述磁于课题管理原则的陈述中正确的选项是（）
A. 科学性原则、服务性原则、目的性原则、计划性原则
B. 计划性原则，系统性原则、服务性原则、先进行原则
C. 目的性原则、计划性原则，科学性原则、组织性原则
D. 服务性原则、整体性原则、教育性原则、科学性原则
PartoftheroutingtableofrouterPG1isdisplayedbelow: Fromanalyzingtheabovecommandoutput,whatistheadministrativedistanceoftheexternalEIGRProutes（）
A. 24
B. 32
C. 90
D. 170
E. 27316
F. Noneoftheotheralternativesapply
Refer to the exhibit. Which three statements accurately describe this GLBP topology？（）
A. Router A is responsible for answering ARP requests sent to the virtual IP address
B. If Router A becomes unavailable， Router B will forward packets sent to the virtual MAC address ofRouter A
C. If another router were added to this GLBP group， there would be two backup AVGs
D. Router B is in GLBP listen state
E. Router A alternately responds to ARP requests with different virtual MAC addresses
F. Router B will transition from blocking state to forwarding state when it becomes the AVG
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 route
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 virtualrouter 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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