Juniper JN0-1103 - Design - Associate (JNCIA-Design)

In an ESI-LAG configuration, both VTEPs (leaf switches) advertise reachability to the same Ethernet Segment Identifier, ensuring redundancy and load balancing. To make this work correctly with LACP, thesystem ID must be identical on both leafs so that the downstream device sees them as a single LAG endpoint.

These elements directly impact port density and scaling requirements in a campus switching design. Understanding the number of unmanned devices, fixed user workstations with IP phones, and standalone VoIP phones is critical for calculating the total number of access ports needed and ensuring the infrastructure can support current and future capacity demands.

To establish an accurate network baseline, it's essential to understand the expected application behavior and gather a comprehensive history of performance metrics over time. This helps identify deviations and troubleshoot issues effectively.

The REST API on Junos devices supports standard HTTP methods such as GET (to retrieve data) and DELETE (to remove configuration elements). However, it is not enabled by default, and HTTPS is typically required for secure communication.

A Secure Web Gateway (SWG) provides proxy services to inspect and filter web traffic and includes firewall capabilities to enforce security policies, block threats, and control access to internet resources.

When placing access points on the same channel, the recommended signal strength threshold to minimize co-channel interference is −65 dBm. This ensures adequate coverage while avoiding signal overlap that can degrade wireless performance.

BGP multipath with multiple-as is required in an EBGP underlay to enable ECMP across multiple autonomous system paths. In an IBGP underlay, Route Reflectors help scale the control plane by reducing the need for a full mesh of BGP sessions among all fabric nodes.

The exhibit shows a hierarchical structure with Leaf, Spine, and Super Spine layers. This architecture is characteristic of a 7-stage IP fabric, which is used in large-scale data centers to provide high scalability and bandwidth. It extends the 3-stage fabric by adding an additional spine layer (Super Spine) for interconnecting multiple spine layers.