Which of the following statement about DCN network planning is wrong? (Multiple choice)
A . The network management server communicates with each managed network element using in-band networking or out-of-band networking. The in-band networking refers to the networking mode where the U2000 manages the devices on the network by using the service channels provided by the managed devices.
B . Huawei transmission domain network elements support three communication protocols for DCN networking. The HWECC protocol is a private communication protocol developed by Huawei for the transmission domain network element DCN networking.
C . The IP address of U2000 is 129.9.0.100/24, its management GNE IP address is 129.9.0.2/24. If the U2000 needs to communicate with an NE whose IP address is 133.168.0.2/24 connected to the gateway NE through IP Over DCC, the U2000 must be directly connected to the gateway N
E . Huawei transmission domain network elements all support the HWECC protocol. The default physical transmission channel is D1 to D12 bytes. When the network element ID is set, ECC communication can be performed without any configuration by plugging in the optical fiber.
Answer: CD