Prepare for HCIA-Transmission V2.5 Certification Exam with DumpsBase’s H31-311_V2.5-ENU Dumps Questions

1. FAS is the frame alignment overhead, the length is 6 bytes, and it is located in the 1st to 6th columns of the first row. The 1st to 3rd bytes are 3 OA1 bytes, and each OA1 is always "1111 0110", that is, 16 F6 in hexadecimal; the 4th to 6th bytes are 3 OA2 bytes, and each OA2 is always "0010 1000", that is, 28 in hexadecimal.

2. The LDG supports electrical layer scheduling at the ODU1 level.

3. The number of network elements (including REG) in the two -fiber bidirectional multiplex section sharing protection ring can exceed 16.

4. In Ethernet, the frame length has a lower limit, which is mainly due to which of the following considerations?

5. When the PM segment of the ODUk generates seriously errored seconds, the network management will report the ODUk_PM_ES alarm.

6. If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex to full-duplex may occur.

7. Which of the following options are in the low-loss area of single-mode fiber? (Multiple choice)

8. What are the following steps for low-speed services to be multiplexed into high-speed SDH services? (Multiple choice)

9. OSN 3500 branch line business has strong up and down capabilities, with 16 branch line outlet slots, 504 2M, 32 E4, 117 E3/DS3, 132 STM-1e up and down subracks, providing STM-1/4/ 16/64 group rate.

10. The levels of forced switching, fiber cut switching, manual switching, and practice switching are arranged from high to low.

11. Physical port: also known as MAC port, is the external port of the board.

12. Which of the following is not included in the basic architecture of MPLS L2VPN?

13. If a bit error is detected in the B1 byte, which of the following alarms will be reported by the peer end?

14. For the OSN6800 device, which of the following slots does not have an electrical layer crossover backplane bus?

15. Complex flow classification refers to classifying packets according to the ToS (Type of Service ) field of IP packets , user priority or EXP field of MPLS packets to identify traffic with different priority characteristics.

16. The communication network can be divided into local area network and wide area network according to the geographical scope it covers, and a metropolitan area network between the local area network and the wide area network. The wide area network is characterized by low delay, high data rate and reliable transmission.

17. The advantages of WDM mainly include the following. (Multiple choice)

18. The dispersion coefficient is the delay difference caused by the optical wavelength signal passing through the unit length of optical fiber in the unit wavelength interval, so which of the following is the unit of the dispersion coefficient?

19. When inserting LCK to the ODUk signal at the local end, what processing will the downstream station system not perform?

20. Which of the following is related to pointer adjustment?

21. Which of the following statements about reuse is correct?

In the process of byte interleaved multiplexing, the information payload and pointer bytes of each frame are interleaved and multiplexed according to the original value, and the segment overhead is also multiplexed accordingly.

22. The U2000 client supports installation on Windows, Solaris, and SUSE Linux operating systems.

23. The optical monitoring channel is set up for the monitoring of the WDM optical transmission system. ITU-T recommends that the wavelength of 1510nm is preferred, and the capacity is 2MHz/s .

24. The half-duplex mode must have a collision detection and avoidance mechanism to avoid the situation where multiple devices seize the line at the same time. This mechanism is the so-called CSMA/CD, and the Chinese name is carrier sense multiple access/collision detection .

25. The current sparse wavelength division multiplexing system generally works in the band from 1271nm to 1611nm. Which of the following is the channel spacing?

26. Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)

27. The most effective subnet mask for a point-to-point WAN link is 255.255.255.252 .

28. The OSN 7500 supports a maximum of 2M service boards. Which of the following is correct.

29. Which of the following alarms is not a switching condition for a two- fiber bidirectional multiplex section protection ring?

30. Which of the following are the main functions of U20 0 0 network management? (Multiple choice)

a. topology management

B. Performance management

C. Troubleshooting

D. End-to-end business management

31. Both QinQ and MPLS can provide users with L2 VPN service, but QinQ is cheaper and easier than MPLS.

32. Which of the following descriptions of MPLS is incorrect? (Multiple choice)

33. Which of the following is the database used by U2000 on PC/WIN2003?

34. Which of the following is correct for optical amplifiers and regenerators? (Multiple choice)

35. The frame structure of ODU4 is four times that of ODU1.

36. The SDH equipment can judge the quality of the clock signal according to the S 1 byte. The larger the value of S 1 is, the higher the quality of the corresponding clock is.

37. Which of the following elements does a data communication network have in terms of equipment? (Multiple choice)

38. MPLS is a label forwarding technology, which of the following was originally designed for?

39. R-LOS, R-LOF, AU-AIS, TU-AIS alarms are all generated and reported on the circuit board.

40. All bytes in the SDH frame structure will be scrambled.

41. Chromatic dispersion includes material dispersion and waveguide dispersion. Generally, only material dispersion and waveguide dispersion are considered in single-mode fiber.

42. QinQ technology can be interpreted as 802.1Q in 802.1Q, in other words, a layer of 802.1Q label is added on top of the 802.1Q label , the outer layer is C-VLAN and the inner layer is S-VLAN , two bytes more than a normal 802.1Q frame .

43. What are the differences between the AU pointer and the TU pointer? (Multiple choice)

44. The SDH network is composed of multiple network nodes (network elements) connected to each other through optical fibers; network topology generally refers to the shape of the network, that is, the geometric arrangement of network nodes and transmission lines, which reflects the logical connection of the network.

45. Regarding the processing of data frames by the data board port, which of the following is correct? (Multiple choice)

46. After mapping and multiplexing, 4 channels of ODU2 signals can be multiplexed into 1 channel of OTU3[ V ] signal, while for ODU2e signal, only 3 channels are needed to be multiplexed into 1 channel of OTU3 [V] signal.

47. Which of the following situations can cause the board to reinsert the BDI maintenance signal to the upstream site? (Multiple choice)

48. K1 and K2 bytes can transmit APS switching signaling, and can also indicate that the signal of the multiplex section is invalid.

49. Which of the following is the monitoring overhead for monitoring and reporting OTUk_DEG and OTUk_EXC alarms?

50. Which of the following statements is incorrect.

51. QinQ technology is a technology of VLAN nesting. QinQ complies with IEEE 802.1q recommendations, and it is also a technology of VLAN extension.

52. Which of the following boards supports the QinQ function?

53. If a bit error occurs in the SDH network, the service signal recovered after the signal is decapsulated must have a bit error.

54. The comb filter is an active optical device, its main function is to couple or separate odd and even waves in the same band.

55. Which of the following descriptions are correct? (Multiple choice)

56. TM is a terminal multiplexer. Its function is: the line port inputs/outputs one STM-N signal, and the branch port can output/input multiple low-speed branch signals.

57. If a bit error is detected in the B2 byte, the peer end will report the following alarm.

58. The physical layer of LAN is often used for the interconnection of routers and switches. Although it is called a local area network, if a 10GBase-LR or -ER optical module is used, the transmission distance can reach 80 kilometers.

59. Which of the descriptions about the FIU board is correct?

60. The maximum transmission distance of Ethernet depends on factors such as line quality and signal attenuation .