JN0-1103 Sample Questions Answers

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.

802.1X authentication is ideal for laptops and company devices, providing strong, identity-based network access control. For devices like printers and cameras that typically do not support 802.1X, MAC authentication offers a fallback method to control access based on device identity.

Mist Edge enables seamless mobility and roaming for real-time applications like VoIP by extending Mist’s cloud services to the on-premises edge. It reduces latency and enables fast, reliable handoffs between APs and buildings - resolving issues like dropped VoIP calls during roaming.

PTX Series routers are purpose-built for the core network, offering ultra-high throughput, scalability, and low-latency forwarding ideal for service provider and large-scale data center cores.

SD-WANallows branches to aggregate multiple WAN links(e.g., MPLS, broadband, LTE) to optimize performance and redundancy. It also supports local breakoutfor Direct Internet Access (DIA), improving cloud application performance by avoiding backhaul to a central site.

The SRX5800 is a high-performance hardware firewall designed for large data centers and supports 10 GbE interfaces. The vSRX is a virtual firewall that also supports 10 GbE virtual interfaces, making it suitable for virtualized data center environments with high throughput needs.

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.

For a 120-meter (400-foot) connection between switches, multimode fiber is the most reliable and cost-effective option. It supports higher bandwidth and longer distances than UTP (which is limited to 100 meters) and is more stable and secure than a wireless solution.

In an EBGP-based IP fabric, each router is in a separate AS, so route reflection is unnecessary - each peer communicates directly. Also, since EBGP peers can form adjacencies using directly connected interfaces, an IGP is not required for underlay routing, simplifying the control plane.

For reliable out-of-band management and recovery from misconfigurations, terminal servers should be connected through a separate network, such as a 4G LTE modem or a parallel network of independent routers. This ensures access remains available even if the production network is down.

The oversubscription ratio in an IP fabric is influenced by the number of spine nodes relative to the number of leaf nodes and their uplinks.

Removing spine nodes reduces available uplink bandwidth, increasing oversubscription.

Adding spine nodes increases available bandwidth between leafs and spines, decreasing the oversubscription ratio.

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.

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.

Planned outages (for maintenance or upgrades) and WAN failures (due to carrier or link issues) both directly impact network uptime by causing service disruptions, either scheduled or unexpected.

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.