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

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

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 ().

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

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

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

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

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.

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?

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

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

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

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

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?

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

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