1. Which of the following options is wrong in the description of NCE-FAN HSI service configuration?

2. GPON only supports downlink AES-128 encryption, XG-PON supports bidirectional AES-128 encryption

3. Among the following options, which of the following descriptions about the configuration of the NCE-FAN HSI template is wrong?

4. When the ONU is replaced in the eSight system, which of the following options can be used to reselect the ONU?

5. The automatic discovery methods provided by eSight include network segment method, ARP method and routing method. At the same time, it supports creating the network segment or IP address of the device that does not need to be connected as an exclusion list, and automatically skips the network segment or IP address configured in the exclusion list during the process of automatic device discovery.

6. In the Type C protection mode, which switching type is not supported?

7. Which of the following descriptions about the type of Ethernet link aggregation group is wrong?

8. In the FTTX network, which of the following principles is wrong when planning data for broadband services?

9. The traditional fusion splicing scheme of POL ODN has centralized light splitting, heavy fiber baking workload and low construction efficiency.

10. Which of the following descriptions is wrong about how Time delay mode works?

11. For the PITP P mode, the VBAS request message is encapsulated in a PADS message and sent to the OLT.

12. The GPON system can realize the security of Internet service data forwarding. Which one is wrong in the description of the data security plan?

13. In the GPON system, in order to ensure the priority forwarding of important services, which queue scheduling method is recommended?

14. Deploying QoS can solve the problem of user service quality in the process of network communication. Its purpose does not include?

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

16. Which of the following options is correct about congestion management?

17. During the implementation of QoS for home broadband services, the DBA speed limit function is configured. Where is it taking effect?

18. When configuring the multicast service on the MA5600T/MA5680T, the multicast WLAN program adopts the static configuration mode. Which of the following options must be configured, otherwise the multicast program may not be able to be viewed?

19. Compared with GPON, XGS-PON can cover more users and provide higher bandwidth rate on the premise of the same ODN network architecture.

20. After the anti-ipattack function is enabled on the OLT, the device cannot be managed remotely via telnet.

21. During the SIP voice service provisioning process, what is the port corresponding to the default VLAN on the user side of the ONT?

22. After the ONU is powered on, the unconfigured ONU cannot be automatically discovered on the OLT. What is the reason for the impossibility?

23. Which of the following descriptions about the characteristics of large concentration and small concentration is wrong?

24. Both XGS-PON and GPON have asymmetric upstream and downstream rates.

25. The number of users under the OLT can also decide whether the VLAN is a single-layer or double-layer VLAN. When the number of users is small, a single-layer VLAN can be used. When the required VLAN to distinguish the number of services and users is greater than ( ), a double-layer LAN must be used.