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Juniper JN0-106 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Configuration Basics15%- Configuration management
  • 1. Hierarchy structure and configuration modes
  • 2. Candidate, active and factory-default configurations
- Commit and rollback operations
  • 1. Commit, commit-check, commit-confirmed
  • 2. Rollback and rescue configuration
- Basic system configuration
  • 1. User authentication and permissions
  • 2. Hostname, domain name and name servers
Topic 2: Networking Fundamentals15%- Networking concepts and models
  • 1. TCP/IP suite and protocol functions
  • 2. Collision and broadcast domains
- IP addressing and subnetting
  • 1. Subnetting, supernetting and route summarization
  • 2. IPv4 and IPv6 addressing
- Ethernet and switching fundamentals
  • 1. Switching operations and VLAN concepts
  • 2. MAC addressing and frame processing
Topic 3: User Interfaces15%- Other management interfaces
  • 1. NETCONF, SSH and out-of-band management
  • 2. J-Web GUI overview
- Command Line Interface (CLI)
  • 1. Command syntax, help and filtering
  • 2. Operational and configuration modes
Topic 4: Junos OS Fundamentals20%- Junos architecture
  • 1. Routing Engine and Packet Forwarding Engine
  • 2. Control and forwarding planes
- Traffic processing
  • 1. Transit and exception traffic flow
  • 2. Packet handling and forwarding logic
- Software versions and upgrades
  • 1. Junos OS release types
  • 2. Upgrade and downgrade procedures
Topic 5: Routing Fundamentals10%- Routing concepts
  • 1. Routing tables and route sources
  • 2. Longest match routing and administrative distance
- Static and dynamic routing
  • 1. OSPF, RIP and BGP basics
  • 2. Static routes and qualified next hops
Topic 6: Routing Policy and Firewall Filters10%- Routing policy
  • 1. Policy application and flow control
  • 2. Policy structure, terms, match conditions and actions
- Firewall filters
  • 1. Filter processing and reverse path forwarding
  • 2. Filter structure, match conditions and actions
Topic 7: Operational Monitoring and Maintenance15%- Monitoring commands
  • 1. Logging, tracing and troubleshooting tools
  • 2. Show commands for system, interfaces and routing
- System maintenance
  • 1. File management and storage monitoring
  • 2. Password recovery and system recovery

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Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q62-Q67):

NEW QUESTION # 62
Which statement is correct about traffic flow in the network shown in the exhibit?

Answer: D

Explanation:
The configuration exhibit demonstrates a classic scenario where mismatched static routing leads to a routing loop. Router R1 is configured with a default route (0.0.0.0/0) pointing to R2 as its next hop. Conversely, R2 is configured with a broad static route for 10.1.0.0/16 pointing back to R1.
If a user sends a packet to an unassigned IP address such as 10.1.99.1, the following sequence occurs:
R1 receives the packet and consults its routing table. Finding no specific match for the 10.1.99.1 host, it uses the default route and forwards the packet to R2.
R2 receives the packet and identifies that 10.1.99.1 falls within its defined static route for
10.1.0.0/16.
Following its configuration, R2 forwards the packet back to R1. This process repeats indefinitely-- or until the packet's Time to Live (TTL) reaches zero--because the broad summary on R2 encompasses addresses that R1 does not actually have a local path for. This illustrates the critical importance of ensuring that summary routes or default routes do not overlap in a way that creates circular forwarding paths for non-existent destinations.


NEW QUESTION # 63
Which two characteristics apply to TCP? (Choose two.)

Answer: C,D

Explanation:
TCP establishes connections using a three-way handshake process before data transmission. It ensures reliable and ordered delivery of data by using sequence numbers and acknowledgments.


NEW QUESTION # 64
Which protocol provides secure remote CLI access to a Junos device?

Answer: C

Explanation:
Securing the management plane is a core requirement for any Junos OS deployment. Secure Shell (SSH) is the industry-standard protocol used to provide encrypted, authenticated remote access to the Junos Command Line Interface (CLI). Unlike Telnet, which transmits both administrative credentials and command data in cleartext, SSH utilizes public-key cryptography to establish a secure tunnel, protecting the session from eavesdropping, man-in-the-middle attacks, and unauthorized interception.
In Junos OS, SSH is typically enabled within the [edit system services] hierarchy. Once active, it allows administrators to perform operational and configuration tasks with the assurance that their management traffic remains confidential. Beyond simple terminal access, SSH serves as the transport mechanism for other secure management functions, such as the NETCONF XML management protocol and Secure Copy (SCP) for file transfers. For high-security environments, Junos supports advanced SSH features including key-based authentication, strong cipher suites, and multi-factor authentication integration. Disabling insecure protocols like Telnet and FTP in favor of SSH and SFTP/SCP is a foundational best practice for hardening the Routing Engine against external threats.


NEW QUESTION # 65
Which command would compare the candidate configuration with the active configuration before committing the changes?

Answer: B

Explanation:
The show | compare command in configuration mode displays the differences between the candidate configuration and the currently active configuration before committing.


NEW QUESTION # 66
What is the purpose of the Address Resolution Protocol (ARP)?

Answer: D

Explanation:
The purpose of ARP is to resolve or map IPv4 addresses to their corresponding MAC (hardware) addresses, allowing devices to communicate over Ethernet networks.


NEW QUESTION # 67
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