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1. When the coverage radius of OLT is (), the comprehensive cost is optimal.

2. In a GPON system, which queue scheduling method is recommended to ensure priority forwarding of important services?

3. In a typical access network, when a large number of IPTV users are connected through the OLT, in order to prevent a large number of IGMP Join and leave messages impact edge router performance. What features are generally recommended for enabling on the OLT?

4. Regarding the principles of ONU/ONT networking construction, which of the following statements is incorrect?

5. The correct multicast MAC address corresponding to the multicast IP address 227.120.1.32 is ().

6. eSight provides automatic discovery methods based on network segments, ARP, and routing. It also supports creating exclusion lists for network segments or IP addresses of devices that do not need to be connected. These exclusion lists will be automatically skipped during automatic device discovery.

7. A campus project uses XGS PON technology N1 standard (link attenuation range of 14-29d8). ONUs are used for AP backhaul. Each ONU has a concurrent upstream and downstream bandwidth of 150Mbps/300Mbps. Excluding splitting loss, the maximum link loss is 10dB. What splitting ratio should the optical splitter use in this project?

8. To replace an ONU in the eSight system, which of the following options can be used to reselect the ONU?

9. Which of the following options is incorrect in describing the NCE-FAN HSI template configuration?

10. When configuring multicast services on the MA5600T/MA5680T, multicast WLAN programs are configured statically. Which of the following options must be configured? Otherwise, multicast programs may not be viewable.

11. Which of the following descriptions of the characteristics of large-scale and small-scale concentrated beam splitting is incorrect?

12. When configuring VolP services, which type of DBA is recommended?

13. The Max-Forwards field can be used in SIP messages to solve loop problems and avoid endless message forwarding.

14. For PITPP mode, the VBAS request message is encapsulated in the PADS message and sent to the OLT.

15. To improve link reliability, the OLT device configures two uplink ports 0/19/0 and 0/20/0 as a port aggregation group. Each member port in the aggregation group distributes packets based on the source MAC address, and the operating mode is LACP aggregation. Which of the following configurations is correct?

16. Type B protection provides redundant protection for both the OLTPON port and the trunk fiber. When the OLT, OLTPON port, or trunk fiber fails, manual switching to another fiber is performed.

17. Which of the following conditions will not trigger GPON? Type B single-homing protection switching?

18. Ethernet port protection group refers to configuring the uplink ports of a device into a protection group. Among them, the working port carries services, while the protection port does not carry services and is in backup state.

19. In the Ethernet port protection group, the data sending and receiving functions of the working port are turned on, and there is business transmission on the link, while the protection port can only receive but not send, and there is no business transmission on the link.

20. In an OLT system, an ONT cannot be added successfully. Which of the following options is the reason for the impossibility?

21. Which of the following options describes the H.248 connection model correctly?

22. 1. User A and User B belong to different domain servers, and both have only one landline phone available for calls . If user A calls user B while user B is out, the number of transactions in the entire conversation is ().

23. When setting up FTTX service networks and planning data, user security must be considered. Which of the following measures can prevent inter-user attacks?

24. In an IPTV service scenario, a black screen appears during a program. Detection shows that the program stream has reached the ONU user port. What is the cause of this phenomenon?

25. If multiple users on the same PON port of the OLT experience Internet disconnection, the possible cause of this failure is ().

26. Which of the following descriptions of Ethernet link aggregation group types is incorrect?

27. When implementing QoS for home broadband services, the DBA rate limit function is configured. Where does it take effect?

28. ERPS is a standard protocol released by ITU-T to implement Ethernet ring network protection functions.

29. After the DHCP simulation is started, it will automatically stop when the system default timeout period is reached, and the simulation results will be deleted at the same time.

30. HSI services use VLAN tags to precisely bind users. If an OLT has 5,000 FTTH users, which VLAN switching solution is recommended?

31. Which of the following options describes the PITP mode correctly?

32. The ONT terminal under a certain PON port cannot be automatically discovered. Which of the following options is the impossible reason?

33. Which of the following descriptions of network security vulnerabilities is correct?

34. Enable DHCP Option 82 in global and VLAN service template mode. Allow user-side DHCP messages to carry Option 82 information on ports and service virtual ports. When the access device receives a user-side DHCP Option 82 message, the processing strategy is ().

35. In NCE-FAN network management, emergency alarms have the highest priority.

36. Under the H.248 protocol, if the signaling IP and media IP are both 10.1.1.100/8 and the voice gateway is 10.1.1.1, which of the following commands is incorrect when configuring the VolP service?

37. A device periodically sends and receives LACP packets to prevent information loss. If no packets are received within () LACP packet exchange periods, the system considers the port faulty.

38. Which of the following descriptions of the PC roaming process between different APs is incorrect?

39. The traditional POL ODN splicing solution uses centralized optical splitting, requires a large fiber baking workload, and has low construction efficiency.

40. What is the default OLT queue scheduling mode?

41. In Type B protection mode, when all ONUs connected to the PON port are offline, which of the following options is correct?

42. The dual-rate three-color marking (TrTCM) algorithm can guarantee the user's basic bandwidth (CIR) and allow users to obtain additional bandwidth services (PIR) when the network is idle, thereby improving the utilization of network resources.

43. GPON only supports downstream AES-128 encryption, while XG-PON supports bidirectional AES-128 encryption.

44. When the OLT service board processes upstream QoS, which specific process is involved?

45. Compared with GPON, XGS-PON can cover more users and provide higher bandwidth rates without changing the ODN network architecture.

46. The GPON system can ensure the security of Internet service data forwarding. Which of the following statements regarding data security planning is incorrect?

47. Which of the following descriptions of how the Time Delay mode works is incorrect?

48. During SIP voice service activation, which port corresponds to the default VLAN on the user side of the ONT?

49. The maximum concurrent upstream and downstream bandwidth required by the ONU is 200 Mbps upstream and 500 Mbps downstream. When using GPON access, what is the maximum splitting ratio that should be planned?

50. When configuring FTTH TPTV services using NCE-FAN, which template will be used?