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Juniper JN0-106 Exam Syllabus Topics:

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

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Juniper Junos, Associate (JNCIA-Junos) JN0-106 Prüfungsfragen mit Lösungen (Q43-Q48):

43. Frage
When considering routing tables and forwarding tables, which two statements are correct?
(Choose two.)

Antwort: C,D

Begründung:
The routing table and forwarding table play distinct roles in a Junos OS device. The correct answers are A and D. The routing table (A) is used by the Routing Engine (RE) to select the best route among all the learned routes, while the routing table (D) stores all routes and prefixes learned from all routing protocols. The forwarding table, in contrast, contains only the active routes chosen by the RE and is used by the Packet Forwarding Engine for actual packet forwarding.


44. Frage
You asked a network engineer to configure a new logical interface on a Juniper router. The interface must use the fourth usable host address from the 172.16.40.128/29 subnet. Which IP address is correct in this scenario?

Antwort: D

Begründung:
A /29 subnet contains 8 addresses. For 172.16.40.128/29, the network address is 172.16.40.128 and the broadcast address is 172.16.40.135, leaving usable hosts 172.16.40.129 through
172.16.40.134. The fourth usable host is 172.16.40.132.


45. Frage
Which command would compare the candidate configuration with the active configuration before committing the changes?

Antwort: B

Begründung:
The Junos OS operates using a candidate configuration model, where changes are made in a temporary buffer before being applied to the running system. To ensure accuracy and prevent unintended network disruptions, it is a critical best practice to review the differences between the candidate buffer and the currently active configuration. The command show | compare executed from the [edit] hierarchy level is the primary tool for this task.
When this command is issued, the CLI performs a line-by-line comparison. The output uses a " diff " format:
lines prefixed with a plus sign (+) represent new statements added to the candidate configuration, while lines prefixed with a minus sign (-) indicate statements that have been removed. This visualization allows the architect to verify exactly what will change upon execution of the commit command. Unlike operational mode commands that only show the final state, show | compare highlights the delta, making it indispensable for auditing complex policy changes or interface reconfigurations. This step acts as a final manual validation gate, reducing the risk of syntax errors or logical misconfigurations entering the production environment.
Using this command is a fundamental skill for passing the JNCIA-Junos exam and for professional day-to-day operations.
Reference: Configuration Basics, Comparing Configurations, Candidate vs. Active.


46. Frage
Which command would you use to return to the top level of the configuration hierarchy without exiting configuration mode?

Antwort: B

Begründung:
The top command immediately moves the user to the top of the configuration hierarchy while remaining in configuration mode.


47. Frage
Which two types of traffic are processed by the Routing Engine? (Choose two.)

Antwort: A,D

Begründung:
The Routing Engine (RE) is the control-plane component of a Junos OS device. Its primary responsibilities include routing protocol processing, system management, maintaining routing tables, running Junos OS processes, and providing administrative access. Consequently, management traffic and control traffic are processed by the Routing Engine. Juniper specifically describes the Routing Engine as controlling routing updates and system management , while routing protocol packets from the network are directed to the Routing Engine.
Management traffic includes traffic associated with services such as SSH, Telnet, SNMP, and other traffic whose destination is the device itself. Control traffic includes routing protocol communications such as OSPF, BGP, and other protocol packets required to establish and maintain the device ' s control-plane state. Juniper categorizes these as local packets , which are handled by the Routing Engine.
By contrast, transit traffic enters one physical interface and is forwarded toward another destination. This forwarding operation is normally handled by the Packet Forwarding Engine (PFE) rather than the Routing Engine. The separation of forwarding and control functions is fundamental to Junos OS architecture.
Study Guide Reference Topics: Junos OS Fundamentals - Routing Engine and Packet Forwarding Engine; control plane versus forwarding plane; management and protocol traffic.


48. Frage
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