单项选择题

Which statement is true about the frequency of OSPF LSA transmissions？（）

A. They are configured per OSPF area.
B. They are configured per virtual router.
C. They are configured per OSPF process.
D. They are configured per OSPF interface.

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单项选择题

What type of router cannot exist within a stub area？（）

A. ABR
B. ASBR
C. internal router
D. non-backbone router

单项选择题

If all OSPF routers on a broadcast network have the same OSPF priority， what parameter is used to determine the new BDR at the time of a DR failure？（）

A. area ID
B. router ID
C. loopback address
D. IP address of interface on broadcast network