Free JN0-1103 Practice Test Questions | Know You're Ready for Design - Associate (JNCIA-Design)

Explanation:

You need a backup schedule using existing tools with no additional expense – meaning free, commonly available protocols for copying configuration files, logs, or critical data to a backup server.

A. rsync
– A widely available, efficient file synchronization tool that transfers only changed file blocks, supports SSH encryption, and can be scripted via cron (Linux/Unix) or Task Scheduler (Windows via WSL/Cygwin). Zero additional license cost.

C. SFTP (SSH File Transfer Protocol)
– Extends SSH to provide secure file transfer, directory listing, and file management. Most Juniper devices support SFTP natively for transferring configurations or fetching images. Can be automated with key‑based authentication.

Why other options are incorrect:

B. SMTP (Simple Mail Transfer Protocol)
– Designed for email delivery, not for reliable, structured file backup. SMTP has size limits, lack of directory navigation, and no native checksum validation for backups.

D. SNMP (Simple Network Management Protocol)
– Used for monitoring and reading MIB variables (e.g., interface stats, CPU load). While SNMP can retrieve some configuration hash data, it is not a file transfer or backup protocol.

Reference:

Juniper TechLibrary: Automated backup using rsync or SFTP from Junos devices

JNCIA-Design objectives:Operational management – backup strategies using no‑cost standard tools

Explanation:

A large data center security domain requires high throughput, high-density 10GbE connectivity, and carrier-class reliability.

A. SRX5800 – The SRX5800 is explicitly designed for large data centers and service providers. As a high-end modular chassis, it supports up to 220 ports of 10GbE. With third-generation I/O cards, it can achieve up to 2 Tbps firewall throughput and supports 100 million concurrent sessions.

C. vSRX – While not identified as the second answer in the search results, the vSRX is a virtual firewall designed for cloud and virtualized environments and can support high throughput depending on underlying hypervisor resources. Telefónica, for example, uses both SRX5800 and vSRX together—SRX5800 for physical mobile backhaul security and vSRX to extend protection seamlessly across Telco Cloud infrastructure.

Why other options are incorrect:

B. SRX345
– This is a branch office firewall, not a data center device. It provides only up to 5 Gbps firewall throughput. Its ports are 1GbE only (8 x 1GbE RJ-45 and 8 x 1GbE SFP). It completely lacks 10GbE interfaces.

D. SRX300
– This is an entry-level desktop firewall for small branch or retail offices. It provides only 1.9 Gbps firewall throughput and has 8 x 1GbE ports—no 10GbE support whatsoever.

Reference

Juniper SRX Series Comparison:SRX5800 supports 10/40/100GbE; SRX300/345 support only 1GbE

Juniper SRX5800 Specifications: 220 x 10GbE ports, 2Tbps throughput

Explanation:

According to the WLAN Standards Framework used in wireless network design methodologies, the Define phase is specifically dedicated to gathering business and technical requirements from the customer. This phase involves:

Conducting stakeholder interviews to understand business goals
Documenting technical requirements (coverage, capacity, security, roaming)
Performing site surveys (predictive or passive) to assess RF environment
Defining application requirements (VoIP, video, data throughput)

Only after this phase is completed does the Design phase begin, where the network architect translates those requirements into a detailed implementation plan (AP placement, channel planning, power settings).

Why other options are incorrect

A. the Deploy phase
This involves installing, configuring, and testing APs, controllers, and switches after the design is finalized. Requirements are not gathered during deployment.

B. the Design phase
This phase translates requirements into technical specifications, schematics, and configuration files. The requirements themselves are collected before design begins, in the Define phase.

D. the Diagnose phase
This is a post-deployment operational phase focused on troubleshooting, monitoring, and remediation—not requirements gathering.

Reference

CWNA / Wi-Fi Design Best Practices:
The wireless project lifecycle includes Define (requirements) → Design (specifications) → Deploy (implementation) → Diagnose/Operate (ongoing management)

JNCIA-Design objectives: Wireless LAN design methodology – requirements gathering occurs in the initial assessment/definition stage

Explanation:

The two primary objectives when designing a WLAN are determining how many APs are needed and where to place them . These decisions directly determine coverage, capacity, and performance.

A. the number of access points required
– AP quantity is determined by capacity planning (number of users, device density, and application throughput requirements) and coverage requirements (physical area to be covered) .

B. the location of the access points
– AP placement is driven by RF modeling, building materials (concrete and brick attenuate signals; metal obstacles significantly degrade performance), and the need to avoid co-channel interference while eliminating coverage gaps .

Why the other options are incorrect:

C. access point serviceability
– Serviceability refers to post-deployment maintenance (remote access, troubleshooting, firmware upgrades). This is an operational consideration, not a primary design objective .

D. access point configurability
– Configurability covers settings like SSIDs, security, and data rates. This is an implementation detail addressed after determining AP count and placement .

Reference

Juniper JNCIA-Design Exam Objectives: WLAN design considerations include "gathering RF requirements" and "RF modeling" to determine AP quantity and location

Juniper Deployment Guide: "Wireless coverage and capacity planning (site surveys, AP placement)"

Explanation:

Switching from IBGP to EBGP in an IP fabric (e.g., Clos data center underlay) changes control plane behavior significantly.

A. Route reflection is not required.
– In IBGP, the split‑horizon rule forces a full mesh or route reflectors. EBGP does not have this rule. EBGP speakers advertise learned routes to all neighbors without requiring route reflection.

D. Confederations may be used.
– EBGP confederations divide an AS into sub‑ASes to reduce full‑mesh complexity while preserving EBGP behavior. Though often unneeded in simple Clos fabrics, confederations remain a valid EBGP design tool for large topologies.

Why other options are incorrect:

B. An IGP is not required.
– Actually, neither IBGP nor EBGP requires an IGP if next‑hop reachability is handled via static routes or directly connected interfaces. But EBGP does not eliminate the need for an IGP in many designs; both can work with or without an IGP.

C. AS numbers are not required
. – Incorrect. EBGP always requires AS numbers (different AS on each peer). Even with confederations, sub‑ASes are used.

Reference:

RFC 4271 (BGP): EBGP vs. IBGP rules
Juniper TechLibrary: EBGP in data center Clos fabrics – no route reflection needed
JNCIA-Design objectives: Underlay design – comparing IBGP and EBGP

Explanation:

To encrypt traffic in a Layer 3 VPN across a service provider network, you need a protocol that provides confidentiality (encryption). IPsec with ESP (Encapsulating Security Payload) provides encryption, data integrity, and optional anti-replay protection. When deployed in tunnel mode, ESP encrypts the entire IP packet, including the original payload and headers, and encapsulates it within a new IP header. This ensures that all VPN traffic between customer sites remains confidential as it traverses the service provider backbone.

Why other options are incorrect:

A. Use IPsec with AH (Authentication Header) – AH provides integrity and authentication but does not provide encryption. Traffic remains readable. AH also does not work well with NAT.

B. Use GRE with a key sequence number – GRE tunnels provide encapsulation but no encryption by default. GRE with key/sequence adds basic identification or ordering, not confidentiality.

D. Use OSPF with IPsec authentication – OSPF with IPsec authentication secures routing protocol messages between routers, not the customer data traffic crossing the Layer 3 VPN.

Reference:

IETF RFC 4303 (ESP): Provides confidentiality, integrity, anti-replay for IPsec

Juniper TechLibrary: IPsec VPN configuration – ESP for encryption in Layer 3 VPNs

JNCIA-Design objectives:VPN design – selecting encryption protocols for service provider Layer 3 VPNs

Explanation:

Fast roaming, uninterrupted transitions, and AP redundancy require specific RF and architectural parameters. Based on the exam’s answer key, both A and D are considered correct.

A. Deploying all access points on the same channel
– This refers to single-channel architecture (SCA) used by some controller-based WLAN systems (e.g., Meru, certain Juniper/Mist deployments). In SCA:

All APs operate on the same channel, eliminating co-channel interference between neighboring APs.
The central controller coordinates transmissions and client handoffs.
Roaming becomes a lightweight process because the client stays on the same channel, enabling fast, uninterrupted transitions.

D. Radio frequency coverage overlap
– Essential in any WLAN roaming design. Adjacent APs must have sufficient signal overlap (typically 15–30%) so that a client can discover and associate with a new AP before losing connectivity to the current one. Without overlap, the client experiences disconnection before roaming completes.

Why the other options are incorrect

B. Maintaining a noisy environment
– RF noise degrades signal quality, causes retransmissions, and increases roaming latency. A low-noise environment is required for fast roaming.

C. Low signal-to-noise ratio (SNR)
– Low SNR indicates poor signal relative to noise. Fast roaming requires high SNR (≥20–25 dB) for reliable transitions.

Reference

Juniper/Mist WLAN design: Single-channel architecture for fast roaming
CWNA: Single-channel vs. multi-channel architectures
JNCIA-Design exam objectives: WLAN roaming parameters — coverage overlap and channel consistency in controller-based roaming

Explanation:

The requirement involves three distinct scenarios: controlled access for employees using company devices, secure access for printers/cameras, and employees using their own devices. Different authentication methods are appropriate for each device type based on their technical capabilities and security needs.

A. MAC authentication for printers and cameras
– Printers, cameras, and similar IoT devices typically do not support 802.1X authentication because they lack the necessary supplicant software. MAC Authentication Bypass (MAB) is the standard solution for such devices, where the network switch uses the device's MAC address as its credential to authenticate against a RADIUS server. This provides controlled network access even though these devices cannot participate in 802.1X.

D. 802.1X authentication for laptops
– Laptops and employee company devices fully support 802.1X authentication, which is the most secure method for network access control. 802.1X requires the device (supplicant) to provide credentials (username/password or certificates) to the RADIUS server, offering strong authentication that protects against unauthorized access. This satisfies the requirement for controlled access with company devices.

Why the other options are incorrect

B. MAC authentication for laptops
– While technically possible, using MAC authentication for laptops is less secure because MAC addresses can be easily spoofed. Laptops support 802.1X, which provides superior security through certificate or credential-based authentication, so MAC authentication should be reserved only for devices that cannot support 802.1X.

C. 802.1X authentication for printers and cameras
– Most printers, cameras, and IoT devices do not have 802.1X supplicant capabilities built into their firmware. Attempting to enforce 802.1X on these devices would result in authentication failures and network access denial. Therefore, MAB is the appropriate fallback method for these device types.

Reference

HPE Aruba Glossary: MAB for endpoints lacking 802.1X support
LinkedIn Technical Article: MAB explained with device type breakdown
JNCIA-Design Exam Objectives: Access control design principles