H31-311-ENU Online Training Archives

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1. When a fiber cut test is performed on a normal MSP ring, which of the following alarms is reported? (Multiple Choice)

TU-AIS

R-LOS

APSJNDI

BD STATUS

2. 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.

TRUE

FALSE

3. Compared with a dense wavelength division multiplexing (DWDM) system, a coarse wavelength division multiplexing (CWDM) system provides a certain number of wavelengths and a transmission distance within ( ) km, which greatly reduces system cost and has strong flexibility.

100

200

4. The SNCP switching speed can be improved if you classify the SNCP services that have the same source, sink, or route into groups.

TRUE

FALSE

5. The standard Ethernet frame length should not be less than 64 bytes.

Which of the following factors cause this limitation? (Multiple Choice)

Minimum transmission distance

Maximum transmission distance

Working mechanism of conflict detection

MAC address

6. The device IP addresses of the gateway NE and non-gateway NEs must be set in the same network segment.

TRUE

FALSE

7. Which of the following are the service board types of MSTP devices? (Multiple Choice)

Interface board

Service processing board

Service processing board with interfaces

Auxiliary board

8. When the LCAS function is used, which of the following overhead bytes are used to transmit control information? (Multiple Choice)

9. Which of the following are the electrical-layer overheads of OTN? (Multiple Choice)

OPUk

ODUk

OCh

OTUk

10. The working mode of a port determines the flow control mode of the port.

When the working mode is 100 Mbit/s full duplex, which of the following flow control modes can be used?

Auto-negotiation flow control mode

Non-auto-negotiation flow control mode

Both of the above

None of the above

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11. When the SXCS board is configured for an OSN 3500, which of the following is the access capacity of the subrack in full configuration?

35G

58.75G

80G

155G

12. When LMSP is configured, there are two switching modes: single-ended switching and dual-ended switching. The protection protocol does not need to be enabled for single-ended switching.

TRUE

FALSE

13. Which of the following statements about the optical-layer interfaces OTM-n.m and OTM-nr.m of OTN is incorrect?

n indicates the number of wavelengths carried by the maximum capacity,

m indicates the rate. The value can be 1, 2, or 3.

r indicates OTM without the OSC function..

OTM-nr.m with OSC signals is OTM-n.m.

14. Which of the following statements about the multiplex section remote error indication (MS-REI) is correct?

① The B2 byte indicates the transmission channel.

② The M1 byte indicates the transmission channel.

③ MS-REI is transmitted from the sink to the source.

④ MS-REI is transmitted from the source to the sink.

⑤ Indicates the number of detected bit errors after the sink receives the MS signals.

①④⑤

②④⑤

①③⑤

②③⑤

15. Which of the following is the frame whose VC-4 J1 byte is indicated by the current frame's AU pointer?

Current frame

Next frame

Previous frame

None of the above

16. When multiple users need to share the same VCTRUNK and use the same VLAN ID, the QinQ technology can be used.

TRUE

FALSE

17. Which of the following statements about the 1+1 protection of cross-connect boards are correct? (Multiple Choice)

The source service board sends services to the active and standby cross-connect boards.

After service cross-connections are completed, the active and standby cross-connect boards send the data of the active cross-connect board to the sink service board.

The sink service board can receive only the data from the active cross-connect board.

The buses of the two cross-connect modules work independently and do not interfere with each other.

The dual-bus system structure indicates that the service board performs dual feeding of data to the cross-connect side and selective receiving of the data on the cross-connect side.

Two cross-connect boards have the same configuartion. Service boards will selectively receive services from one of them based on the quality of services and status of cross-connect boards.

18. In a WDM system, using a dielectric thin film filter (TFF) is ideal when fewer than () wavelengths are used.

19. According to the formula of "ODUk rate = 239/(239-k) x STM-N frame rate”, the ODU4 rate is equal to 239/235 x STM-N frame rate.

TRUE

FALSE

20. Linear MSP (LMSP) has two modes: 1+1 and 1:1. Extra services can be configured for the protection channel only in the 1:1 mode of LMSP.

TRUE

FALSE