A.HUB. is the data link layer device

B.HUB connects multiple terminal devices together to form a star network through ports

C.HU is a physical layer device

D.The shared bus technology is used inside the HUB device, and the CSMA/CD technology is used for interaction

A.B1, B2, B3 can only detect the odd number of errors in a block, and the even number of errors cannot be detected

B.Bit error means that after receiving, judging, and regenerating, some bits in the digital code stream have errors.

C.Through B1, B2, B3, the bit errors of the regeneration section, multiplex section and high-order channel can be detected respectively

D.B1, B2, B3 can only detect the even number of errors in a block, and the odd number of errors cannot be detected

A.ODUk SNCP Protection

B.In-board 1+1 protection

C.Tributary SNCP Protection

D.Client side 1+1 protection

A.Preemptive Mode

B.Port MAC address

C.VRRP group ID

D.Priority

A.False

B.True