Huawei HCSA-Presales-Transmission & Access Exam Practice Tests and PDFs

GPON (Gigabit Passive Optical Network) does not use AES-128 encryption for downstream traffic. Instead, GPON uses AES-128 encryptiononly for upstream trafficto ensure data security between the Optical Network Unit (ONU) and the Optical Line Terminal (OLT). Downstream traffic in GPON is broadcasted to all ONUs, and encryption is not applied because the data is intended for multiple users. The encryption key is dynamically managed by the OLT and distributed securely to the ONUs. This behavior is defined in theITU-T G.984 standard, which specifies the GPON architecture and security mechanisms. For downstream traffic, the security relies on higher-layer protocols (e.g., IPsec or application-level encryption). Reference: ITU-T G.984 Standard - GPON Architecture and Security Huawei GPON Technical Documentation

POL (Passive Optical LAN) is a solution designed for enterprise campus environments, leveraging PON technology to provide converged voice, data, and video services. While POL is highly versatile and can be deployed in various scenarios such as education, healthcare, hospitality, and office environments, itcannot always be sold independentlyin all office scenarios. The deployment of POL depends on factors such as the existing infrastructure, customer requirements, and the scale of the network. In some cases, additional components like Wi-Fi access points, routers, or switches may be required to complement the POL solution. Therefore, POL is typically sold as part of an integrated solution tailored to the customer's specific needs. Reference: Huawei Campus OptiX Solution Guide POL Deployment Best Practices

TheCampus OptiX solutionis a comprehensive offering that integrates multiple components to deliver a complete Passive Optical LAN (POL) solution. The main sale products include: OLT (Optical Line Terminal):Central device for managing the network. ODN (Optical Distribution Network):Passive infrastructure for signal distribution. ONU/ONT (Optical Network Unit/Terminal):Customer-side devices for connecting end-users. eSight:Huawei's network management system (NMS) for centralized monitoring and management of the entire network. While options like "OLT + ODN + ONU" or "OLT + ONT" represent subsets of the solution, the inclusion ofeSightis critical for effective network management and operation, making option A the most complete and accurate choice. Reference: Huawei Campus OptiX Solution Guide eSight Product Documentation

A Passive Optical Network (PON) system consists of three primary components: OLT (Optical Line Terminal):The central device located at the service provider's premises. It connects to the core network and manages communication with multiple ONUs. ONU (Optical Network Unit):The customer-side device located at the user's premises. It converts optical signals into electrical signals for end-user devices. ODN (Optical Distribution Network):The passive infrastructure that includes optical fibers, splitters, and connectors to distribute signals between the OLT and ONUs. WDM (Wavelength Division Multiplexing) is a technology used in optical networks but is not a basic component of a PON system. It is often used in advanced PON systems like XG-PON or NG-PON2 to separate upstream and downstream wavelengths. Reference: ITU-T G.984 Standard - PON Architecture Huawei PON System Design Guide

In asafe city scenario, outdoor monitoring is a critical requirement. Huawei recommends usingoutdoor monitoring ONTslike theEG8084PandPowerCube500for such deployments. These devices are ruggedized and designed to operate in harsh environmental conditions, making them ideal for outdoor surveillance applications. While indoor monitoring ONTs and pre-connection ODN are useful in other scenarios, they are not specifically optimized for outdoor safe city deployments. Similarly, small and medium OLTs like the EA5801 and EA5800-X2 are suitable for smaller-scale networks but are not directly related to the safe city use case. Reference: Huawei Safe City Solution Guide Campus OptiX (POL) Deployment Scenarios