单项选择题

What is a function of the OSPF Type 7 LSA？（）

A.It describes the reachability of routes in stub areas.
B.It describes the reachability of routes in totally-stubby areas.
C.It describes the reachability of routes in not-so-stubby areas.
D.It describes the reachability of routes in partially-stubby areas.

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多项选择题

Which three authentication options does IS-IS support？（）

A.MD5
B.DES
C.Kerberos
D.Unauthenticated
E.Simple password

多项选择题

Which four components make up the Network Entity Title （NET） of an IS-IS router？（）

A.AF
B.AFI
C.MAC
D.Area
E.SysID
F.A-Selector
G.N-Selector
H.IP-address

单项选择题

Routers A and B are connected with a point-to-point OC-3 interface. Each router’s 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