多选题Which two features prevent routing loops between the OSPF sites of a customer when the sites aremultihomed or a backdoor link is used between the sites？ （）Asham linkBdown bitCvirtual linkDSite of OriginEdomain tag
多选题
Which two features prevent routing loops between the OSPF sites of a customer when the sites aremultihomed or a backdoor link is used between the sites？ （）
A
sham link
B
down bit
C
virtual link
D
Site of Origin
E
domain tag
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