多选题Which two are characteristics of the IS -IS protocol but not OSPF?（）Aforms adjacencies with all neighborsBsupports demand circuit routingCprovides routing support for multiple network layer protocolsDutilizes SPF algorithmEprovides for network scalability by allowing the network to be separated into areasFthree layers of hierarchical routing
多选题
Which two are characteristics of the IS -IS protocol but not OSPF?（）
A
forms adjacencies with all neighbors
B
supports demand circuit routing
C
provides routing support for multiple network layer protocols
D
utilizes SPF algorithm
E
provides for network scalability by allowing the network to be separated into areas
F
three layers of hierarchical routing
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