Huawei HCIA-Transmission V2.5 (H31-311_V2.5) Free Practice Test
Question 1
FAS is the frame alignment overhead with a length of 6 bytes. The 1st to 3rd bytes are 3 OA1 bytes, each OA1 is always "1111 0110"; the 1st to 6th bytes are 3 OA2 bytes, each OA2 is always "0010 1000".
OA1 and OA2 are the frame alignment bytes of this frame signal, which are equivalent to A1 A2 in the SDH frame structure.
OA1 and OA2 are the frame alignment bytes of this frame signal, which are equivalent to A1 A2 in the SDH frame structure.
Correct Answer: B
Question 2
In the network interface of OTN, the network interface within the same operator is the intra-domain interface, which is further divided into the interface between equipment from different manufacturers, IaVI, and the interface within the subnet of equipment from the same manufacturer, IrVI, according to the different equipment manufacturers.
Correct Answer: A
Question 3
When the rate of the SNCP ring composed of four OptiX OSN2500 devices is 2.5 Gbit/s, the service capacity of the network can carry a maximum of () 2 Mbit/s signal
Correct Answer: A
Question 4
The essence of OPSK modulation is to select four possible values on the phase of the optical field so as to reduce the baud rate of the optical signal by half without reducing the line rate. This multiplexing method can reduce the spectral bandwidth of the optical signal by half, making multi-wavelength ULH transmission with 50GH interval and 40G line rate possible.
Correct Answer: B
Question 5
The segment overhead of STM-4 is () bytes/frame.
Correct Answer: D
Question 6
Which of the following bytes is used to monitor the bit error of the regeneration section signal stream?
Correct Answer: D
Question 7
When multiple users need to share the same VCTRUNK and use the same VLAN ID, QinQ technology can be used.
Correct Answer: B
Question 8
What are the main advantages of WDM? (Multiple choice)
Correct Answer: A,B,C,D
Question 9
The number of error blocks in each VC4 channel is detected by B3 at the receiving end. At the same time, this information is sent back to the transmitting end by which of the following items? and reported as HP.REI and OHP-FEBBE at the transmitting end.
Correct Answer: D