# Looking Glass Looking Glass is Zenlayer’s online network probing and visualization tool, designed for global users to evaluate real-time network path quality, latency, ISP performance, and acceleration effectiveness. It covers Zenlayer’s global PoP (Point of Presence) nodes and supports multiple protocols (e.g., Ping, MTR, BGP) for both private and public network analysis. Looking Glass is composed of several specialized modules, each designed to analyze different aspects of global network performance: * **Route Explorer**: Diagnose routing paths and network link quality from Zenlayer PoPs to target IPs or domains using Ping, MTR, and BGP. * **Last-mile Performance**: Gain insights into the quality of last-mile connectivity by exploring each PoP's coverage of local ISPs (eyeball networks) and their corresponding average ping latency (ms). Ideal for evaluating regional network performance and user experience. * **Private Backbone Latency**: Visualize real-time latency across Zenlayer’s premium global private backbone with full-mesh connectivity. This module supports planning and optimization of **Private Connect (Layer 2)** and **Cloud Router (Layer 3)** deployments by providing accurate latency measurements between PoPs. * **Public Transit Latency**: Analyze real-time latency across Zenlayer’s 220+ Tbps global IP transit network. This module reveals routing performance between public-facing PoPs, helping benchmark public internet routes against private backbone alternatives. * **Global Acceleration Test**: Simulate real-world download scenarios by measuring the time to fetch a 1 MB test file from your selected source region. Use this module to assess the impact of Zenlayer acceleration on cross-border content delivery and user experience. Together, these modules provide a comprehensive view of global network health — from core backbone routing to end-user last-mile performance — helping users monitor, troubleshoot, and optimize their network experience across Zenlayer’s global infrastructure. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.console.zenlayer.com/welcome/platform/looking-glass.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.