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单选题
Which of the following protocols enables a group of routers to form a single virtual router， and then use the real IP address of a router as the gateway address， as defined in RFC 2338？（）
A
Proxy ARP
B
HSRP
C
IRDP
D
VRRP
E
GLBP
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HSRPB
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Proxy ARPD
GLBPE
VRRPF
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Proxy ARPB
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VRRPE
GLBP
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