JN0-1103 Design - Associate (JNCIA-Design) Question and Answers

According to the WLA Standards Framework, the Define phase involves meeting with the customer to gather business and technical requirements, which serve as the foundation for the subsequent wireless network design and deployment phases.

Capacity planning requires a clear view of the current application behavior to assess real-time demands and predicting future traffic projections to ensure the network can scale efficiently and handle increased load over time.

In SD-WAN,path selections are made at the local routing engine level on each SD-WAN router based on policies defined by the centralized controller. This allows for real-time, dynamic traffic steering without requiring per-packet decisions from the controller.

Juniper’s SASE (Secure Access Service Edge) solution combines Juniper Secure Edge, which delivers cloud-based security services, and Mist AI-Driven SD-WAN, which provides secure, intelligent WAN connectivity. Together, they support secure, seamless access across distributed environments.

Using discrete border leafs enables design flexibility, such as applying different oversubscription ratios for east-west (intra-fabric) and north-south (external) traffic. This separation improves scalability and performance tuning compared to placing border roles directly on spines.

The Juniper Connected Security strategy aims to integrate security across the entire network by extending protection to routers, switches, and every point of connection, ensuring that security is enforced holistically - not just at the perimeter.

SD-WAN routes traffic, including security-sensitive data, across MPLS, VPNs, and Internet circuits using encryption and policy-based routing to ensure secure and efficient transmission, even over public networks.

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.

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.

Secure Vector Routing (SVR) is specifically designed for SD-WAN environments with limited bandwidth, as it offers encrypted and policy-based routing with minimal overhead compared to protocols like IPsec or GRE. This makes it ideal for bandwidth-constrained branch sites.

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.

Postman is commonly used to prototype API requests, making it ideal for testing and verifying network APIs before automation scripts are developed. It also helps in connecting network infrastructure to cloud applications by crafting and sending REST API calls to interact with cloud-based services and platforms.

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 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.