1. Which option is correct about the order of the SDH interface and the module units where the crossed unit's signal flow flows?

2. If there is no plug-in board on the hardware, which light of SSN1PQ1 will light in red?

3. Which of the following is a class B address 154.19.2.3 network address?

4. The subnet mask 255.255.255.248, according to the formula, calculates and gets the results that it can accommodate 23 devices, which are 8 units.

5. As for the alarm AU-AIS, which of the following statement is correct?

6. There are many types of optical wavelength division multiplexer, which of the followings do belong to the optical wavelength division multiplexer? (Multiple choice)

7. MPLS label allocation is divided into static allocation and dynamic allocation, in which there is no allocation principle for static allocation label, as long as the label values are guaranteed to be different.

8. The SDH network will not change the structure and rate of the client-side signal.

9. Which followings are the basic requirements that DWDM system request the light source?

10. Which are the functions that SDH overhead bytes complete? (Multiple choice)

11. G.707 multiplexed circuit diagram can only multiplex 2M34M140M signal into the STM-N.

12. Which of the following description on OTUk frame format is wrong?

13. What is the reason that the luminous power that RAMAN amplifier's pump light outputs is very high?

14. SDH for any rate's signal can be transmitted in SDH system by packaging.

15. In OTN, which of the following maintenance signal is passed from the downstream site to the upstream site?

16. The so-called full-duplex, that is, data can be sent and received simultaneously, without disturbing each other.

17. TTL, during the survival time, its role is mainly used to limit the hop number that IP data packets in the network pass through the router, such as TTL=1 on behalf that the packet can only be transmitted in their own LAN.

18. Which of the following statements are correct for pointer adjustments? (Multiple choice)

19. OCI indicates an open connection indication. A signal sent to downstream, indicates that the connected function's upstream releases management command and opens the matrix connection, after which the detected signal loss state at the termination point may be related to the open matrix.

20. Which of the following statement is correct? (Multiple choice)