单项选择题

What does the LSP Holdtime field in an IS-IS database indicate?（）

A. the LSP age
B. the LSP refresh interval
C. the LSP elapsed lifetime
D. the LSP remaining lifetime

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单项选择题

An Intermediate System experiencing memory problems indicates that it may have incomplete data by setting which bit in its LSP?（）

A. more bit
B. partition bit
C. attached bit
D. overload bit

单项选择题

Which IS-IS authentication method is supported on the ERX Edge Router?（）

A. simple password
B. HMAC message digest 5
C. Password Authentication Protocol
D. Challenge Handshake Authentication Protocol

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 the same area.
How many IS-IS adjacencies exist between the two routers?（）

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