An authentication request for a PPP over ATM client has been returned to the router with an address of 255.255.255.254. What does this indicate to the router?（）
- A、A static IP address is used.
- B、An unnumbered address is used.
- C、The returned RADIUS address is used.
- D、The IP address-pool configuration is used.
正确答案:D
答案解析:有
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