JN0-1103 Juniper Design - Associate (JNCIA-Design) Free Practice Exam Questions (2025 Updated)

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.

Since only the core switches support EVPN-VXLAN, and the access switches do not, the appropriate design is a Campus Fabric core-distribution model. This design allows EVPN-VXLAN at the core while maintaining compatibility with non-fabric-capable access switches using traditional Layer 2 or Layer 3 connectivity.

In a 3-stage IP fabric, each leaf node must connect to every spine node to ensure full mesh connectivity at Layer 3 between leafs via the spine layer. This design supports ECMP and optimal traffic distribution across the fabric.

The highlighted device connects to multiple servers and also connects upstream to spine switches. This placement and function identify it as a leaf node in a leaf-spine architecture, responsible for connecting endpoints (such as servers) into the fabric.

A greenfield deployment refers to a new deployment in an environment with no existing infrastructure, offering fewer restrictions and greater design flexibility compared to modifying or integrating into an existing network.

In a Clos data center fabric using IBGP as the underlay, BGP ADD-PATH must be enabled to allow multiple equal-cost paths to be advertised and installed on the leaf switches. This supports ECMP (Equal-Cost Multi-Path) routing, which is essential for optimal traffic distribution in the fabric.

WAN aggregation is represented by the central router that connects multiple branch sites through a Carrier Ethernet service to the enterprise WAN, consolidating traffic.

Private WAN is shown through the use of Carrier Ethernet, which is a private service providing secure, dedicated connectivity between branches and the enterprise WAN.

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.

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.

To ensure encryption of traffic between customer sites over a Layer 3 VPN, the most effective solution is IPsec with ESP (Encapsulating Security Payload). ESP provides both encryption and authentication, ensuring data confidentiality and integrity across the service provider network.

IPsec with NAT Traversal (NAT-T) encapsulates IPsec packets within UDP headers, adding additional overhead compared to standard IPsec. This results in higher packet overhead, which can affect performance and MTU handling more than other VPN protocols.

Fault management helps detect and address potential issues before downtime occurs, while measuring network performance, errors, and security metrics enables administrators to make data-driven decisions for maintaining and optimizing the network.

In Juniper Networks' enterprise network designs, the distribution layer typically uses QFX and EX Series switches. These platforms provide the necessary scalability, performance, and Layer 3 capabilities to aggregate access layer switches and support routing between VLANs.

When designing a WLAN, determining the number and location of access points is essential to ensure adequate coverage, capacity, and performance, while minimizing interference and ensuring seamless connectivity.

A greenfield deployment starts from scratch, with no existing infrastructure, allowing for full design freedom. A brownfield deployment involves working within an existing network environment that typically requires integration or upgrades.

The exhibit shows a leaf-spine architecture with two spine layers and one leaf layer, forming a 3-stage IP Clos topology. It also aligns with a 3-tier architecture (Core, Aggregation/Distribution, Access), commonly used in traditional and modern data center designs to improve scalability and performance.

cSRX and vSRX are the virtualized versions of the Juniper SRX Series firewalls designed for deployment in virtual environments. The cSRX is containerized, while the vSRX is a VM-based firewall, both supporting advanced security services in cloud or virtualized data centers.