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Question 1

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During the requirements-gathering phase of a network design, which document best captures the business drivers and constraints provided by stakeholders?

Low-level design with IP addressing tables

Statement of requirements or business requirements document

As-built diagram from a prior deployment

Routing protocol configuration template

to track

2026 Statistics

Key Facts: JNCIA-Design Exam

Multiple-Choice Questions

Juniper exam page

90 min

Exam Duration

Juniper exam page

$200

Associate Exam Fee

Juniper purchase options

3 years

Certification Validity

Juniper recertification policy

JN0-1302

Exam Code

Juniper certification page

9 domains

Design Topic Areas

Juniper exam objectives

JNCIA-Design (exam JN0-1302) is Juniper's associate-level certification for network design. It covers design process and requirements gathering, hierarchical and spine-leaf topology models, high availability and fault isolation, scalability techniques, WAN and security design, routing protocol selection, QoS, IPv6 addressing, Juniper product positioning (MX/PTX/QFX/SRX/EX), and Juniper Apstra. The exam is 65 questions in 90 minutes via Pearson VUE. Juniper does not publicly publish a numeric passing score.

Sample JNCIA-Design Practice Questions

Try these sample questions to test your JNCIA-Design exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1During the requirements-gathering phase of a network design, which document best captures the business drivers and constraints provided by stakeholders?

A.Low-level design with IP addressing tables

B.Statement of requirements or business requirements document

C.As-built diagram from a prior deployment

D.Routing protocol configuration template

Explanation: A statement of requirements or business requirements document is the primary output of stakeholder interviews. It records business drivers, technical constraints, budget, timeline, and success criteria before any topology decisions are made. As-built diagrams and configuration templates come later in the design lifecycle.

2A retail chain requires its new WAN to support a 99.99% monthly uptime SLA. Which design phase converts this business requirement into a specific technical constraint?

A.Proof-of-concept testing

B.Requirements analysis and gap identification

C.Physical cabling installation

D.Device staging and burn-in

Explanation: Requirements analysis maps business objectives such as an uptime SLA into measurable technical parameters — in this case, mean time between failures, failover time, redundancy requirements, and monitoring thresholds. This translation is what makes business drivers actionable for engineers.

3Which term describes the three-tier campus model that divides the network into core, distribution, and access layers?

A.Spine-leaf Clos topology

B.Hierarchical design model

C.Collapsed core architecture

D.Fabric underlay model

Explanation: The hierarchical design model is the classical three-tier approach: the access layer connects end devices, the distribution layer provides policy and aggregation, and the core layer provides high-speed switching between distribution blocks. It is the foundation for campus and enterprise network design.

4In a spine-leaf Clos data center fabric, every leaf switch connects to every spine switch. What is the primary traffic engineering benefit of this full-mesh between tiers?

A.Any-to-any traffic paths share the same hop count, enabling predictable, equal-cost multipath forwarding

B.Leaf switches provide default gateway services, eliminating spine routing entirely

C.Spine switches perform all Layer 2 flooding, reducing leaf CPU load

D.The model requires fewer cables than a hierarchical three-tier design at the same scale

Explanation: In a Clos fabric, every leaf-to-leaf flow traverses exactly two hops via any spine, so all paths are equal-cost. This allows ECMP to distribute traffic uniformly across all uplinks without any single spine becoming a bottleneck, which is the key reason the model scales well in data centers.

5A small branch office needs a single network device to provide both Layer 2 switching and Layer 3 routing without a separate core tier. Which design model is most appropriate?

A.Full three-tier hierarchical model

B.Spine-leaf Clos with border leaves

C.Collapsed core architecture

D.Campus fabric with underlay and overlay

Explanation: A collapsed core merges the core and distribution functions into a single device or device pair, making it cost-effective for small sites with limited user counts. The access layer still connects end devices, but fewer devices are required overall, reducing capex and management complexity.

6Which high-availability model runs two active devices simultaneously so both forward traffic, and a failure simply reduces capacity rather than causing an outage?

A.Active-standby with VRRP failover

B.N+1 cold-standby redundancy

C.Active-active redundancy

D.Single-device with graceful restart

Explanation: In active-active redundancy, both devices carry live traffic at all times. A failure causes the remaining device to absorb the load rather than triggering a failover event. This model maximizes utilization and eliminates the failover delay present in active-standby designs.

7A data center core has four spine switches and one is powered off for maintenance. Traffic continues because the remaining three spines absorb the load. Which redundancy model does this describe?

A.Active-standby with preemption

B.N+1 redundancy

C.Logical redundancy via VRRP

D.Physical redundancy via chassis clustering

Explanation: N+1 redundancy means the design has one more unit than the minimum required to carry full load. In this example, three spines can carry 100% of traffic, so the fourth provides one spare unit. When any one spine fails or is taken offline, the remaining N units absorb the load without service interruption.

8In network design, what is the purpose of a fault isolation domain?

A.To encrypt traffic between zones so failures cannot propagate

B.To contain the blast radius of a failure so it does not cascade across the entire network

C.To duplicate all packets so a secondary path always has warm state

D.To consolidate all routing into a single autonomous system for simpler management

Explanation: A fault isolation domain is a design boundary that limits how far a failure can propagate. Examples include separate IGP areas, VRFs, and modular building blocks. When a failure occurs inside the domain, other domains continue to operate normally, which reduces the scope of any outage.

9A campus network must grow from 500 to 5,000 users over three years. The design team chooses to add more access switches and uplinks rather than replacing core hardware. Which scalability approach does this represent?

A.Scale-up (vertical scaling)

B.Scale-out (horizontal scaling)

C.Oversubscription reduction

D.ECMP pruning

Explanation: Scale-out (horizontal scaling) adds more units of the same type — in this case more access switches — rather than upgrading existing hardware to a larger model. This approach is generally preferred for campus and data center designs because it avoids expensive forklift upgrades and provides incremental capacity growth.

10A network engineer is designing a data center fabric that will carry large storage traffic. Which MTU configuration is required to avoid performance degradation on iSCSI and NFS flows?

A.Standard 1500-byte MTU on all interfaces

B.Jumbo frames (MTU 9000 or 9216 bytes) end-to-end

C.MTU of 576 bytes to match legacy IP minimum

D.Fragmentation enabled on all spine interfaces

Explanation: iSCSI and NFS are sensitive to fragmentation because TCP retransmissions on fragmented storage flows dramatically reduce throughput. Setting jumbo frames (typically 9000 or 9216 bytes) end-to-end allows large I/O requests to traverse the fabric without fragmentation, which is a hard design requirement for storage traffic.

About the JNCIA-Design Exam

JNCIA-Design is Juniper Networks' associate-level design certification covering network design fundamentals, topology models, high availability, scalability, WAN design, security design, routing protocol selection, QoS, IPv6 addressing, and Juniper product positioning for design roles.

Questions

65 scored questions

Time Limit

90 minutes

Passing Score

Unpublished by Juniper (pass/fail result shown immediately)

Exam Fee

$200 (Juniper Networks / Pearson VUE)

JNCIA-Design Exam Content Outline

Est. 15%

Design Process

Requirements gathering, business drivers vs. technical constraints, design lifecycle phases, stakeholder documentation, high-level and low-level design, proof-of-concept validation, and as-built documentation

Est. 20%

Design Models

Hierarchical core/distribution/access model, spine-leaf Clos topology, collapsed core, campus fabric with EVPN-VXLAN, and data center fabric design

Est. 15%

Resilience and High Availability

N+1 redundancy, active-active and active-standby models, physical vs. logical redundancy, BFD for fast failure detection, and fault isolation domains

Est. 10%

Scalability

Scale-up vs. scale-out, MTU and jumbo frames, IGP flooding domain sizing, OSPF area design, and oversubscription ratios

Est. 10%

WAN Design

MPLS L3VPN, IPsec overlay, SD-WAN, private vs. public transport, SLA requirements, and hub-and-spoke vs. mesh topologies

Est. 10%

Security Design

Defense in depth, perimeter vs. zero trust, micro-segmentation, DHCP snooping, and zone-based security architecture

Est. 10%

Routing Protocol Selection

OSPF vs. IS-IS for IGP, BGP for edge and EVPN, BGP route reflectors, RPKI, and AS path engineering

Est. 5%

QoS Design

Classification, marking, queuing, shaping, policing, DSCP EF/AF/CS values, and end-to-end QoS policy

Est. 5%

Addressing and IPv6

Subnetting, VLSM, dual-stack, SLAAC vs. DHCPv6, and IPv6 addressing conventions

How to Pass the JNCIA-Design Exam

What You Need to Know

Passing score: Unpublished by Juniper (pass/fail result shown immediately)
Exam length: 65 questions
Time limit: 90 minutes
Exam fee: $200

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

JNCIA-Design Study Tips from Top Performers

1Understand the trade-offs between hierarchical three-tier, collapsed core, and spine-leaf Clos designs — know when each model is appropriate and why.

2Master the DSCP EF, AF, CS, and BE per-hop behaviors and be able to assign the correct marking to voice, video, critical data, and best-effort traffic classes.

3Know the differences between active-active, active-standby, and N+1 redundancy models and the hardware and software components that enable each.

4Understand IPv6 dual-stack, SLAAC, DHCPv6 stateful vs. stateless, and /64 subnet sizing so you can answer both conceptual and calculation questions.

5Learn the Juniper product family positioning: EX (campus), QFX (data center leaf-spine), MX (service edge), PTX (core/peering), SRX (security), and Apstra (intent-based automation).

6Practice VLSM subnet calculations — be able to determine the correct mask for a given host count and calculate oversubscription ratios.

Frequently Asked Questions

What is the JNCIA-Design exam code?

The JNCIA-Design exam is JN0-1302. It is delivered through Pearson VUE and covers associate-level network design concepts across topology, high availability, WAN, security, QoS, IPv6, and Juniper product positioning.

How many questions are on the JNCIA-Design exam?

The JNCIA-Design exam consists of 65 multiple-choice questions with a 90-minute time limit, consistent with other Juniper associate-level written exams delivered via Pearson VUE.

What is the JNCIA-Design passing score?

Juniper does not publicly publish a numeric passing score for JNCIA-Design. Candidates receive immediate pass or fail status after completing the exam at a Pearson VUE testing center or via online proctoring.

What topics does JNCIA-Design cover?

JNCIA-Design covers network design fundamentals including the design process, hierarchical and spine-leaf topology models, high availability, scalability, WAN design (MPLS, IPsec, SD-WAN), security design (zero trust, micro-segmentation), routing protocol selection, QoS, IPv6 addressing, Juniper product positioning, and Juniper Apstra capabilities.

How long should I study for JNCIA-Design?

Most candidates with general networking experience can prepare in 40 to 60 hours over 3 to 5 weeks. Focus on topology models (hierarchical vs. spine-leaf), HA concepts, WAN design trade-offs, QoS DSCP values, and Juniper product family positioning — these areas appear frequently on associate-level design exams.

What is the difference between JNCIA-Design and JNCIA-Junos?

JNCIA-Junos tests hands-on Junos OS knowledge including CLI, configuration, monitoring, and routing fundamentals. JNCIA-Design tests network design concepts — how to architect networks, select topologies, plan redundancy, and choose products — without requiring deep Junos CLI proficiency.