单项选择题

Routers A and B are connected with a point-to-point OC-3 interface. Each routers OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in different areas. How many IS-IS adjacencies exist between the two routers?（）

A.0
B.1
C.2
D.3

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多项选择题
What are two attributes of the Extended IS-Reachability TLV 22?（）

A. system-ID
B. band-width
C. wide-metrics
D. authentication
多项选择题
In JUNOS software, which three routing protocols can be used to route IPv6?（）

A. IS-IS
B. Static
C. RIPv2
D. OSPFv2
E. MP-BGP
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