单项选择题
A.It is used to detect loops.
B.It is an interface identifier.
C.It selects a compression algorithm.
D.It specifies the transmission media.
单项选择题 Which software process sorts client login requests and assigns them to a virtual router for RADIUS service?（）
单项选择题 When sending an LCP Configuration Request, what can the ERX Edge Router possibly negotiate?（）
单项选择题 When configuring PPP over ATM interfaces, what does the profile utility accomplish?（）