Advance Your Career by Using Online H31-311_V2.5-ENU Dumps

1. The bits in the S1 byte indicate the clock quality level. Which side below indicates the highest clock quality level?

2. Which of the following aspects are the main advantages of SDH? (Multiple choices)

3. Mapping is a process of adapting tributary signals into ( ) at the SDH network boundary.

4. When the rate of the SNCP ring composed of four OptiXOSN2500 devices is 2.5Gbit/s, the service capacity of the network can carry ()2Mbit/s signals at most

5. For the management unit pointer adjustment, when the rate of VC>AU, which of the following adjustments will occur in the device?

6. In the case of 1+1 linear MSP, which of the following switching modes does not require the APS protection protocol to be enabled? (Multiple choice)

7. The information payload area stores only the information payload.

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

9. Both OTUk and ODUkP support obtaining LOF and LOM information by detecting FAS and MFRS overhead .

10. MS-REI is transmitted from source to sink.

Indicates the number of bit errors detected by the receiver after receiving the MS signal.

11. Which of the following refers to Optical module parameter L-64.1?

12. The RAMAN amplifier utilizes which of the non-linear effects?

13. Regarding the B1 byte, which of the following statements are correct? (Multiple choice)

14. According to the calculation formula of OUTk signal rate: OTUk rate = 255/(239-k) xSTM -N frame rate , so the rate of OTU4 signal is 255/235 x 99 532800 kbit /s .

15. OTUk_UAS is the unavailable second of the optical transmission segment. The unavailable second refers to the severe errored second lasting for more than 10 seconds, and the unavailable time starts from the 11th second, but the 10 seconds of the severely errored second are also counted. Enter the unavailable time, when the severe errored second continues to disappear for more than 10 seconds, it will enter the available time from the 11th second, and the 10 seconds without serious errored seconds are also counted as available time.

16. Which of the following layers defines the protocols that control the network layer?

The protocols at this layer apply to logical links, which are end-to-end connections between two devices.

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

18. When the J1 bytes do not match, report () an alarm and the service may be interrupted.

19. PDM uses a polarizing beam splitter to split the laser into two perpendicular directions: x and y.

20. Which of the following device domains can be managed by U2000? (Multiple choice)

21. The OLT is connected to the switch through ( ), using the V5.2 interface protocol.

22. After the network sends a fiber cut, which of the following alarms does not appear when the 1+1 linear multiplex section protection is configured?

23. The communication network is a system that interconnects geographically dispersed user terminal equipment to realize communication and information exchange, and is mainly composed of user equipment and transmission equipment.

24. HONET integrated service access network belongs to ( ) access mode.

25. OCh means use of electrical monitoring techniques.

26. The management scope of OMSn is the path from the input optical port on the multiplexer unit of the sending site to the output optical port on the demultiplexer unit of the receiving site, called the optical multiplex section (OMS) path.

27. Which of the following logical function blocks is used to generate an R-LOS alarm?

28. 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 .

29. Which of the following description for the OTUk frame format is wrong?

30. Which of the following statements is incorrect.

31. OCI stands for open connection indication, a signal sent downstream, indicating that the upstream management command in the connection function has opened the matrix connection, and the signal loss state detected at the terminal point may be related to the opened matrix.

32. On the network management system, the network element performance monitoring time is set to () minutes and () hours.

33. 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.

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

35. EPL service exclusively uses ports and bandwidth, and different users may need to share resources.

Which of the following methods can be used to isolate user data?

36. Which of the following IP addresses is a Class C IP address?

37. 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?

38. OTN electrical layer SM, PM, and TCMi overheads all contain a 1-byte BIP8 field, and the frame structure ranges they monitor are different.

39. In the OTN mapping path, the ODUk signal can only be obtained by mapping the OPUk signal at the same level .

40. 1000BaseSX adopts single-mode fiber, and uses light with a wavelength of 1300nm working window to transmit services.

41. SP3D board supports 63 E1 services

42. Which of the following situations occurs, the ODUk_PM_DEG alarm will be reported on the network management?

43. NEA and NEB are adjacent NEs. Which of the following performance events are reported by the NEA if day 3 and lower order bit errors occur in the direction A>day and day 1082, B3 and lower order bit errors occur in the direction B>A? (Multiple choice)

44. Which of the following statements about OTN's optical layer interfaces OTM-n.m and OTM-nr.m are incorrect?

45. In terms of protection capability, which of the following topological structures has the strongest protection capability?

46. 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.

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

48. Which of the following layers of overhead belong to the electrical layer overhead of OTN? (Multiple choices)

49. The clock unit can only access the external clock source through the external clock interface as the timing signal source of the system. Additionally, it can output a processed clock and provide a clock source for other devices that require timing.

50. One-way ring means that under normal network conditions, the routes of business sending and receiving are inconsistent. We call the business of separating routing as one-way business.

51. If the OTUk layer overhead is damaged, the board may report OTUk_SM_AIS to indicate the abnormal situation.

52. Which of the following options are correct? (Multiple choice)

53. TTL, time to live, its function is mainly to limit the number of hops that IP data packets can pass through the router in the network, such as TTL=1, it means that the data packet can only be transmitted in its own LAN.

54. Which of the following statements about overhead bytes is incorrect?

55. The difference between dispersion compensation fiber and ordinary fiber is that the dispersion compensation fiber has a negative dispersion coefficient at ().

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

57. Which of the following is not a passive optical device? (Multiple choice)

58. Which of the following network element forms completes the cross-multiplexing between branches and lines, between lines and lines, and service up and down?

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

60. In the case of SNCP, line boards selectively receive service. Therefore, SNCP can protect the service on the line.

61. When carrying out Ethernet service transmission, which of the following encapsulation protocols is used for the mixed connection of equipment from different manufacturers?

62. Tunnel/ VC are two kinds of labels in MPLS, which of the following is the value range?

63. Which standard encapsulation protocols are defined in MSTP? (Multiple choice)

64. In the OSN550, the CX plug contains a function board integrated system control and communication (SCC) unit cross-connect unit and clock unit. There are various types of function boards according to the functions and access functions provided by the OSN550.

65. Which of the following alarms did the peer report when a bit error was detected in the B2 byte?

66. Which of the following can be used as the central wavelength of the pump source in EDFA? (Multiple choice)

67. The SCC board can generate an optical supervisory channel.

68. The switch receives a data frame, searches the MAC forwarding table according to the destination MAC address of the data frame, and the search result is one or a group of ports, and sends the data packet to the sending queue of the corresponding port according to the search result .

69. Which of following is the switching mode of 1:N linear multiplex section?

70. 1310nm and 1550nm transmission windows are low loss windows. In DWDM systems, only the 1550nm transmission window is used. Which of the following is the main reason?

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

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

73. 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 .

74. Which of the following is the procedure for multiplexing low-speed services into high-speed SDH services? (Multiple choice)

75. Which of the following items does the MAC forwarding table contain? (Multiple choice)

76. Adjacent concatenation can be converted into virtual concatenation, but virtual concatenation cannot be converted into adjacent concatenation .

77. The "2" in the optical module parameter "L-64.2" indicates which of the following working windows?

78. Which of the following is the adjustment unit of AU-PTR?

79. The MAC address of the computer network card is uniformly assigned to each manufacturer by the IETF, and is unique in the world.

80. Which of the following bridges are used to forward data according to the MAC address and VLANID carried in the data?

81. The VLAN domain can isolate the unicast packets of different users, and also isolate the broadcast packets of different VLAN.

82. The single-fiber bidirectional wavelength division multiplexing system uses only one optical fiber to realize simultaneous transmission of optical signals in two directions in one optical fiber, and the optical signals in the two directions should be arranged at different wavelengths.

83. Which of the following is the main structure of the WDM system with N-channel wavelength multiplexing? (Multiple choice)

84. The process from C4 to VC4 in the multiplexing process is rate adaptation.

85. The 2Mbit/s signal is currently used the most. Which of the following steps are involved in the process of multiplexing the 2Mbit/s signal into the STM-N? (Multiple choice)

86. Which of the following is not an advantage of using QinQ technology?

87. GFP-F (Frame-Mapped GFP) is a block-oriented data encoding (such as Fiber Channel, ESCON) processing mode.

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

89. Which of the following is a functional unit that provides a high-speed signal interface and processes the corresponding signal?

90. The encapsulation formats of TMD E1 service PWE3 mainly include SAToP mode and CESoPSN mode, the main difference is whether to perceive the structure of TDM signal and processing overhead.

91. Which of the following bytes can be used for wired telephony between two REG devices?

92. Which of the following is not an advantage of WDM?

93. Which of the following levels does the U2000 network management belong to?

94. There are many types of optical wavelength division multiplexers. Which are the following types of optical wavelength division multiplexers? (Multiple choice)

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

96. Only one TCM can be used at one site.

97. Use CLI to log in to the subrack, enter ( ) and press Enter to view the subrack number .

98. When setting the LCAS mode, please follow the following principles: 1 If the equipment at both ends is Huawei equipment, please set it to "standard mode" 2 If Huawei equipment is interconnected with third-party equipment, please use the mode supported by the third-party equipment Set interconnected devices to the same mode.

99. Which of the following statements about the U2000 license is incorrect?

100. The frame rates of STM-1, STM-4, STM-16, and STM-64 signals are all the same at 8000 frames per second.

101. RU on node detects OTS_LOS alarm and inserts OTS_BDI alarm into node A when fiber between node and node B is open RU on node A reports OTS_BDI alarm ・ Line board on downstream node C reports OCh_SSF alarm.

102. When setting the VLAN tag value, all ports of the same device should be configured with the same VLAN ID.

103. The receiver performs a BIP8 check on the scrambled STM-16. If the BIP-8 check result is XORed, the value 10001100 of the B1 byte contained in the next STM-16 frame indicates that there is a ( ) bit error block in the STM-16 frame.

104. After TCM monitoring is enabled, when the upstream station detects a LOF alarm, it will insert the IAE, and the local station will report the ODU1_TCMn_IAES performance event.

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

106. Which of the following is not a condition for triggering multiplex section protection (MSP)?

107. G.707 multiplexing circuit diagram can only multiplex 2M34M140M signals into STM-N.

108. Which of the following are communication quality alerts? (Multiple choice)

109. In OTN, which of the following maintenance signals is transmitted from the downstream station to the upstream station?

110. Which of the following statements about cross-connect board 1+1 protection are correct? (Multiple choice)

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

112. Which of the following is the multiplexing method of SDH?

113. Which of the following overheads does not belong to the ODUk overhead?

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

115. Which of the following is wrong about LCAS?

116. The unit of physical layer data in the OSI reference model is (), and the unit of data link layer data is ().

117. The SDH frame structure is a rectangular block frame with which of the following options as the unit?

118. For SDH equipment, in the frame structure of STM-N , the rate corresponding to each bit is () b/s.

119. During service configuration, there are two slot modes. Huawei uses the staggered slot mode by default.

120. When the U2000 is synchronizing, the same network element data as the U2000 will not be uploaded to the U2000, and the data that exists on the 2000 but not on the network elements will be deleted.

121. Light propagates at different speeds in different media, and it seems that different media impede the propagation of light with different resistances .

122. In the process of adjusting the side of the data service, we often use the PING command to verify whether the Ethernet service at both ends of the device is established. If the port with the IP address 129.9.0.1 is continuously PING 200 times with a packet length of 1000 bytes, which is the command of DOS?

123. Which of the following is the main advantage of SDH? (Multiple choice)

124. The rate represented by STM-1 is ().

125. OptiX OSN3500 supports a variety of cross-connect boards, and provides 40G/80G/120G/200G high-order cross-connect capacity and 5G/20G/40G/120G low -order cross-connect capacity according to different board models.

126. 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.

127. Both PDH and SDH have global unified standards .

128. Which of the following statements about extended ECC is incorrect?

129. Which of the following is the maximum number of OSN 2500 subracks that can be placed in a 2.2m cabinet?

130. The value of the MFAS byte increases with the sequence number of the OTUk/ODUk base frame, and includes the most () base frames

131. Which of the following is the electrical layer overhead of OTN? (Multiple choice)

132. For Huawei equipment, the NODE ID is the unique identifier of the intelligent network element on the control plane. After the network is configured with intelligent services, it is recommended not to modify the NODE ID.

133. Four network elements form an STM-4 bidirectional multiplex section protection ring. Which of the following is the maximum service capacity on the network?

134. Which of the following local maintenance terminals can be used to manage MSTP devices?

135. 1510nm optical monitoring channel can be effectively amplified after passing through EDFA.

136. The frame structure of TU3 is a bit incomplete, and the gap needs to be filled. Which of the following phenomena can be effectively prevented by doing so?

137. 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 .

138. Which of the following communication protocols are used for DCN management of Huawei equipment? (Multiple choice)

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

140. Which of the following statements about basic LCAS functions are correct? (Multiple choice)

141. Tunnel is a mechanism for transparently carrying information on the network. It is used to carry PW, and one PW can be carried on one Tunnel.

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