On a 3-port CT3 card, how many HDLC controllers does each port support?（）

单项选择题You would like to configure an Ethernet interface with the following characteristics: Which set of configuration commands accurately completes this task?（）

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

单项选择题You would like to configure an Ethernet interface with the following characteristics: Fast Which set of configuration commands accurately completes this task?（）

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

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

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