Manual configuration will clear data on the NE side.
A. TRUE
B. FALSE
When a bridge uses the IVL learning mode, the entry in the MAC address table is created according to the source MAC address and source port of the data frame. This entry is valid for all VLANs.
A. TRUE
B. FALSE
Which of the following is the maximum number of OSN 3500 subracks that can be installed in a 2.2 m cabinet?
A. 1
B. 2
C. 3
D. 4
Both PDH and SDH have globally unified standards.
A. TRUE
B. FALSE
A 1510 nm optical supervisory channel can be effectively amplified after it passes an EDFA.
A. TRUE
B. FALSE
When multiple users need to share the same VCTRUNK and use the same VLAN ID, the QinQ technology can be used.
A. TRUE
B. FALSE
Optical supervisory channels are intended for the supervisory of WDM optical transmission systems. In ITU-T recommendations, 1510 nm wavelengths at a ( ) rate are preferentially used.
A. 64 kbit/s
B. 192 kbit/s
C. 2Mbit/s
D. 576 kbit/s
A two-fiber ring topology consisting of three NEs is arranged in the counterclockwise sequence as A, B, and C. Services between A and C occupy the 48th VC-12 timeslot in the first VC-4 on the short path, and services between B and C also occupy the 48th VC-12 timeslot in the first VC-4 on the short path. In this case, which of the following is the subnet type of the ring protection?
A. Unidirectional path protection ring
B. SNCP ring
C. Bidirectional MSP ring r
D. All of the above
EPL services exclusively use ports and bandwidths, and different users may need to share resources. Which of the following methods can be used to isolate user data?
A. VLANID
B. MPLS label
C. QinQ technology
D. All of the above
Which of the following layers defines the protocols that control the network layer? The protocols of the layer work on logical links, that is end-to-end connections between two devices.
A. Network layer
B. Data link layer
C. Transport layer
D. Application layer
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