多项选择题

Which two statements are correct regarding IS-IS?（）

A. Routers maintain a single link-state database per area.
B. Routers maintain a separate Level 1 link-state database.
C. Routers maintain a separate Level 2 link-state database.
D. Routers maintain a single Level 1 link-state database across multiple areas.

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多项选择题

Which two forwarding classes have bandwidth assigned when CoS is not explicitly configured inJUNOS software?（）

A. best effort (BE)
B. network control (NC)
C. assured forwarding (AF)
D. expedited forwarding (EF)

多项选择题

What are two reasons for using a virtual link in OSPF?（）

A. Provides fast convergence times.
B. Supports connections of multiple backbones.
C. Eliminates the need for a Designated Router.
D. Supports non direct connections to the backbone.

单项选择题

By default, to which peers will a BGP router advertise routes learned from IBGP peers?（）

A. all BGP peers
B. all IBGP peers
C. all EBGP peers
D. all MBGP peers