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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
  • Junos OS Fundamentals: Covers the architecture of Junos OS, focusing on the separation of control and forwarding planes and how traffic is processed by the routing and packet-forwarding engines.
Topic 4
  • Routing Fundamentals: Covers core routing concepts on Junos devices, including routing and forwarding tables, route preference, static routing, routing instances, and an introduction to dynamic routing protocols.

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Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q98-Q103):

NEW QUESTION # 98
Which two tasks should be performed when creating a new user account on a Junos device?
(Choose two.)

Answer: A,C

Explanation:
Creating a new user account in Junos OS involves several specific steps within the [edit system login] configuration hierarchy. To establish a functional and secure user account, an administrator must first define the username and assign that user to a login class. Login classes are essential because they define the permissions and access levels for the user, such as super-user, read- only, or operator. Without a login class, a user would have no permissions to perform tasks within the CLI.
The second mandatory task is to configure an authentication method for the user, most commonly a password. This is typically done using the authentication plain-text-password command, which prompts the administrator to enter and confirm the secret string that the system then hashes and stores. While Junos also supports public-key authentication for SSH, a local password remains the standard for basic access control. It is important to note that SSH access is generally controlled at the system level under [edit system services] and does not need to be enabled on a per-user basis individually. Furthermore, allowing a user to bypass authentication is contrary to the Junos security model and is not a standard task in user account creation.


NEW QUESTION # 99
Which command would you use to return to the top level of the configuration hierarchy without exiting configuration mode?

Answer: B

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


NEW QUESTION # 100
How are the Routing Engine and the Packet Forwarding Engine components connected?

Answer: D

Explanation:
The fundamental architecture of Junos OS is built upon the clean separation of the Control Plane (Routing Engine or RE) and the Forwarding Plane (Packet Forwarding Engine or PFE). While these two components perform vastly different tasks, they must maintain a high-speed, reliable communication channel to synchronize the state of the device. This connection is achieved through an internal Ethernet link .
This internal link serves several critical functions. First, it allows the Routing Engine to " push " the distilled forwarding table (FIB) to the PFE, ensuring that the hardware knows exactly how to handle incoming transit traffic at wire speed. Second, it acts as a conduit for exception traffic . If the PFE receives a packet that it cannot handle alone-such as an OSPF hello, a BGP update, or an ICMP " Time Exceeded " message-it sends that packet over the internal Ethernet link to the RE for processing. This link is carefully policed by built-in rate limiters to ensure that a flood of transit-related exception traffic cannot overwhelm the Routing Engine ' s CPU, a mechanism known as control plane protection. By using a standard Ethernet-based internal fabric, Junos ensures a scalable and modular design where the RE can focus on complex protocol calculations while the PFE focuses on the heavy lifting of packet switching.
Reference: Junos OS Fundamentals, Control and Forwarding Plane Separation.


NEW QUESTION # 101
Which statement best describes the primary function of the Routing Engine in a Junos device when processing network traffic and maintaining system control operations?

Answer: D

Explanation:
The Routing Engine is responsible for the control plane, running routing protocols, maintaining routing tables, and managing the device. It does not forward packets; that is the Packet Forwarding Engine's role. This separation improves performance and scalability in Junos architecture.


NEW QUESTION # 102
When multiple routes exist to the same destination IP address, which rule do routers use to select the next hop?

Answer: D

Explanation:
Routers select the route with the longest prefix match, meaning the most specific route, to determine the next hop for forwarding traffic.


NEW QUESTION # 103
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