JN0-104 Junos – Associate (JNCIA-Junos) Exam

The JNCIA-Junos certification is designed for networking professionals with beginner-intermediate knowledge of networking. The written exam verifies your understanding of the core functionality of the Juniper Networks Junos OS.

Because JNCIA-Junos provides a core understanding of the Juniper Networks core operating system, it serves as the baseline certification for multiple certification tracks:

Data Center Certification Track
Enterprise Routing and Switching Certification Track
Service Provider Routing and Switching Certification Track

Exam Preparation
We recommend the following resources to help you prepare for your exam. However, these resources aren’t required, and using them doesn’t guarantee you’ll pass the exam.

Recommended Training
Getting Started with Networking
Introduction to the Junos OS (IJOS)

Exam Resources
Industry/product knowledge
Juniper TechLibrary

Additional Preparation
Juniper Learning Portal

Exam Objectives
Here’s a high-level view of the skillset required to successfully complete the JNCIA-Junos certification exam.

Exam Objective

Networking Fundamentals
Identify the concepts and functionality of various fundamental elements of networking
Collision domains and broadcast domains
Function of routers and switches
Ethernet networks
Layer 2 addressing, including address resolution
Layer 3 / IP addressing including subnet masks
IPv4 / IPv6
Subnetting and supernetting
Decimal to binary conversion
Longest match routing
CoS
Connection-oriented vs. connectionless protocols

Junos OS Fundamentals
Identify the concepts, benefits or functionality of the core elements of the Junos OS
Software architecture
Control and forwarding planes
Routing Engine and Packet Forwarding Engine
Transit traffic processing
Exception traffic

User Interfaces
Identify the concepts, operation or functionality of the Junos OS user interface
CLI functionality
CLI modes
CLI navigation
CLI Help
Filtering output
Active versus candidate configuration
Reverting to previous configurations
Modifying, managing, and saving configuration files
Viewing, comparing, and loading configuration files
J-Web (core/common functionality only)

Configuration Basics
Identify the main elements for configuring Junos devices
Factory-default state
Initial configuration
User accounts
Login classes
User authentication methods
Interface types and properties
Configuration groups
Additional initial configuration elements, such as NTP, SNMP, and syslog
Configuration archival
Logging and tracing
Rescue configuration
Describe how to configure basic components of a Junos device

Operational Monitoring and Maintenance
Identify methods of monitoring or maintaining Junos devices
Show commands
Monitor commands
Interface statistics and errors
Network tools, such as ping, traceroute, telnet, SSH, and so on
Junos OS installation and upgrades
Powering on and shutting down Junos devices
Root password recovery
Describe monitoring or maintenance procedures for a Junos device

Routing Fundamentals
Identify basic routing concepts or functionality for Junos devices
Traffic forwarding concepts
Routing tables
Routing versus forwarding tables
Route preference
Routing instances
Static routing
Advantages of and use cases for dynamic routing protocols
Describe how to configure or monitor basic routing elements for a Junos device

Routing Policy and Firewall Filters
Identify the concepts or functionality of routing policy and firewall filters on Junos devices
Default routing policies
Import and export policies
Routing policy flow
Effect of policies on routes and routing tables
Policy structure and terms
Policy match criteria, match types, and actions
Firewall filter concepts
Filter structure and terms
Filter match criteria and actions
Effect of filters on packets
Unicast reverse-path-forwarding (RPF)
Describe how to configure or monitor routing policies and firewall filters on a Junos device

Exam Details
Exam questions are derived from the recommended training and the exam resources listed above. Pass/fail status is available immediately after taking the exam. The exam is only provided in English.

Exam Code : JN0-104
Prerequisite Certification : None
Delivered by : Pearson VUE
Exam Length : 90 minutes
Exam Type : 65 multiple-choice questions
Software Versions : Junos OS 21.2
Recertification : Juniper certifications are valid for three years. For more information, see Recertification.

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Question 1: 
In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?

A. collisions on the full-duplex side; collisions on the half-duplex side
B. collisions on the full-duplex side; runts on the half-duplex side
C. collisions on the half-duplex side; giants on the full-duplex side
D. collisions on the half-duplex side; framing errors on the full-duplex side

Correct Answer: D

Question 2: 
Which of these represents the simplified version of 2001:0000:3238:DFE1:0063:0000:0000:FEFB?

A.2:1:0:3238:DFE1:63::FEFB
B.2001:0:3238:DFE1:63::FEFB
C.2001::3238:DFE1:63::FEFB

Correct Answer: B

Question 3: 
Which of these allows the communication packets to exceed the smallest MTU (Maximum Transmission Unit)? (Choose two)

A. packet segmentation
B. packet serialisation
C. packet sequencing
D. packet parallelization

Correct Answer: A,C

Question 4: 
Which of these are true about Layer 2 broadcast frames? (choose two)

A. Layer 2 broadcast frames are relayed by switches to devices on the same VLAN.
B. Layer 2 broadcast frames are relayed by routers to all connected VLANs.
C .Layer 2 broadcast frames are discarded by routers that connect to multiple VLANs.
D. Layer 2 broadcast frames are processed by all devices on the same VLAN.

Correct Answer: A,D

Question 5: 
Which of these applications would be best suited for UDP Traffic?

A. Web browsing
B. Streaming television shows
C. Downloading a program
D. On-line shopping

Correct Answer: B

Question 6: 
Which layer of the TCP/IP model is tasked with delivering packets to the destination?

A. Application Layer
B. Internet Layer
C. Transport Layer
D. Network Layer

Correct Answer: B

Question 7: 
Which of these describe a broadcast domain? (choose two)

A. Broadcast domains require that the participating devices connect to common switches or hubs.
B. Broadcast domains consist of devices reachable by frames addressed to the Layer 2 broadcast address.
C. Broadcast domains consist of devices that reside on the same VLAN.
D. Broadcast domains require a Layer 3 device.

Correct Answer: B,C