单项选择题

Which CLI command displays FECN and BECN information on a Frame Relay interface configured on serial interface 4/0:3/1 ?（）

A.A
B.B
C.C
D.D

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多项选择题

Which two services protect the ERX Edge Router from unauthorized CLI logins?（）

A.A
B.B
C.C
D.D

多项选择题

Which two features protect the ERX Edge Router from denial-of-service attacks?（）

A.A
B.B
C.C
D.D

单项选择题

A customer's application requires 30 virtual paths on a four port OC3 card.
Which command allows this functionality?（）

A.A
B.B
C.C
D.D