JN0-106 Exam Reference | JN0-106 Exam Questions Pdf

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Juniper JN0-106 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Operational Monitoring and Maintenance: Covers the tools and procedures used to monitor, maintain, and troubleshoot Junos devices, including show
  • monitor commands, network utilities, OS upgrades, and password recovery.
Topic 2
  • Networking Fundamentals: Covers core networking concepts including IP addressing, subnetting, Layer 2
  • 3 operations, routing basics, and protocol types essential for understanding how networks function.
Topic 3
  • Routing Policy and Firewall Filters: Covers how to control traffic flow on Junos devices using routing policies and firewall filters, including policy structure, match criteria, filter actions, and unicast RPF.

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To practice for a Junos, Associate (JNCIA-Junos) in the software (free test), you should perform a self-assessment. The Juniper JN0-106 practice test software keeps track of each previous attempt and highlights the improvements with each attempt. The Juniper JN0-106 Mock Exam setup can be configured to a particular style & arrive at unique questions.

Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q12-Q17):

NEW QUESTION # 12
Which protocol is used to discover the Layer 2 (MAC) address of a next hop for IPv6 hosts?

Answer: B

Explanation:
In the IPv6 protocol suite, the traditional Address Resolution Protocol (ARP) used in IPv4 has been deprecated and replaced by the Neighbor Discovery Protocol (NDP). NDP is a multifaceted protocol built upon the Internet Control Message Protocol version 6 (ICMPv6). Its primary purpose is to allow a host or router to determine the Layer 2 hardware (MAC) address of a neighbor on the same local link when only the neighbor's IPv6 address is known.
This specific process is known as Neighbor Solicitation and Neighbor Advertisement. When a Junos device needs to resolve a MAC address for an IPv6 next hop, it sends a Neighbor Solicitation (ICMPv6 Type 135) message to the solicited-node multicast address. The target host responds with a Neighbor Advertisement (ICMPv6 Type 136) containing its physical MAC address. Beyond address resolution, NDP also handles Router Discovery, Prefix Discovery, and Duplicate Address Detection (DAD). Unlike ARP, which relies on broadcasts that can impact all hosts on a segment, NDP utilizes efficient multicast communication. Understanding NDP is critical for Junos architects, as it is the foundational mechanism that facilitates logical-to-physical address mapping in modern IPv6 environments, ensuring that the Packet Forwarding Engine can properly encapsulate frames for local delivery.


NEW QUESTION # 13
Which OSPF neighbor state indicates that two routers have fully synchronized their link-state databases?

Answer: C

Explanation:
The Full state indicates that OSPF routers have completed database synchronization and are fully adjacent.


NEW QUESTION # 14

Referring to the exhibit, which command would be used to view the IP subnet addresses associated with prefix-list DIRECT-IP?

Answer: D

Explanation:
The exhibit illustrates the use of the apply-path feature within a prefix list configuration. In Junos OS, apply- path is a dynamic configuration utility that allows a prefix list to be automatically populated with values derived from other parts of the configuration-in this case, all IPv4 addresses assigned to interfaces with the xe-* prefix. This is particularly useful for building automated firewall filters or routing policies that stay updated as interfaces are added or modified.
When viewing the standard configuration using show configuration, the CLI only displays the literal apply- path statement. To verify the actual list of IP addresses that the system has inherited and populated into the DIRECT-IP list, the administrator must use the | display inheritance pipe filter. This command instructs the Junos OS parser to expand all inherited values and dynamic paths, showing the effective configuration as it is seen by the Packet Forwarding Engine. Based on the exhibit, this would reveal the subnets associated with xe-
0/1/0, xe-0/1/1, and xe-0/1/2, while ignoring ge-0/0/0 because it does not match the xe-* wildcard. This verification is a critical troubleshooting step before applying such a prefix list to a transit firewall filter like Export-Direct.
Reference: Routing Policy and Firewall Filters, Prefix Lists, and the apply-path statement.


NEW QUESTION # 15
What is the network address for a host with an IP address of 192.168.87.125/16?

Answer: A


NEW QUESTION # 16
Which statement accurately describes the purpose of route preference in Junos OS?

Answer: C

Explanation:
In the Junos OS architecture, the routing table often receives prefix information from various sources, including direct connections, static configurations, and multiple dynamic interior and exterior gateway protocols. Route preference, frequently referred to as administrative distance in other vendor environments, serves as the primary tie-breaking mechanism used by the Routing Engine to select a single "active" route when multiple entries for the exact same destination prefix exist from different protocol sources. Each routing source is assigned a default numerical value, where a lower numerical value indicates a more preferred or "trustworthy" source. For instance, a direct route typically carries a preference of 0, while OSPF internal routes default to 10 and BGP routes default to 170.
The selection process evaluates these values; the route with the lowest preference is installed in the forwarding table and used for transit traffic. If preferences are equal, Junos secondary tie- breakers like local preference or metric are considered. Understanding this hierarchy is critical for traffic engineering and ensuring predictable routing behavior across the fabric. Modification of these default values via routing policy allows administrators to influence path selection without altering the underlying protocol metrics themselves.


NEW QUESTION # 17
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