JN0-106 Praxisprüfung & JN0-106 Exam

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Juniper JN0-106 Prüfungsplan:

ThemaEinzelheiten
Thema 1
  • 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.
Thema 2
  • 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.
Thema 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.
Thema 4
  • 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.

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Juniper Junos, Associate (JNCIA-Junos) JN0-106 Prüfungsfragen mit Lösungen (Q66-Q71):

66. Frage

Referring to the exhibit, you are configuring a Junos router to provide connectivity to a building across town on the network 10.10.10.0/24. The next-hop router is at 10.10.1.1, which is reachable using interface ge-0/0/1.
After committing the configuration in the exhibit, users report they still cannot reach the 10.10.10.0/24 network, and the route does not appear as active in the routing table. In this scenario, which statement is correct?

Antwort: D

Begründung:
In Junos OS, the Routing Engine (RE) performs a validation check on every entry in the Routing Information Base (RIB). For a static route to be considered valid and transition to an active state in the inet.0 table, its designated next hop must be resolvable . A next-hop address is resolvable only if the router has an existing route (typically a directly connected route) to that specific IP address.
According to the exhibit, the static route for 10.10.10.0/24 has been configured with a next hop of 10.1.1.1 .
However, the scenario states that the actual gateway router is located at 10.10.1.1 . If the local interface (ge-0
/0/1) is configured with an IP in the 10.10.1.0/x subnet, the router will have a direct route to 10.10.1.1, but it will likely have no path to the 10.1.1.1 address provided in the exhibit.
Because the router cannot resolve the next hop 10.1.1.1 , the static route is placed in an " inactive " or " hidden " state. It will not be installed in the forwarding table pushed to the Packet Forwarding Engine (PFE), and standard show route commands will not display it unless specific flags like hidden or all are used. This logic ensures that the router does not attempt to forward packets into a " black hole " where the gateway is logically unreachable. To fix this, the administrator must modify the configuration to point to the correct, reachable next-hop address of 10.10.1.1.
Reference: Routing Fundamentals, Static Route Resolution, and Troubleshooting Routing Tables.


67. Frage
Which two common routing policy actions affect the flow of policy evaluation? (Choose two.)

Antwort: A,B

Begründung:
In Junos OS routing policy evaluation, "next policy" (A) and "next term" (C) are common actions that affect the flow of policy evaluation. "Next policy" directs the evaluation to the next policy in the sequence, whereas "next term" moves the evaluation to the next term within the current policy, allowing for granular control over routing decisions.


68. Frage
Your team alerts you that users connected to ge-0/0/5 are experiencing intermittent slowness. You log in to the switch and want to see live, real-time traffic updates for that interface to determine whether the link is being over-utilized. Which monitoring command should you use in this scenario?

Antwort: A

Begründung:
In the Junos OS environment, distinguishing between static diagnostic data and real-time telemetry is crucial for effective troubleshooting. While commands like show interfaces provide a cumulative snapshot of counters since the last reboot or counter clear, they do not easily reveal instantaneous spikes or fluctuating utilization patterns. To address the requirement for " live, real-time traffic updates, " the monitor interface command is the correct operational tool.
When an architect executes monitor interface ge-0/0/5, the CLI launches an interactive, ncurses-based screen that refreshes every second. This display provides immediate visibility into input and output bits-per-second (bps), packets-per-second (pps), and error increments. Unlike static commands, this real-time stream allows a technician to observe micro-bursts or sustained high-utilization periods as they occur, which is essential for diagnosing " intermittent slowness " caused by congestion. In contrast, show chassis hardware focuses on physical inventory, and show interfaces terse only provides administrative and operational status. Even the extensive version of the show command only offers a point-in-time calculation of averages. Therefore, monitor interface is the primary mechanism for interactive performance auditing of individual ports on the Packet Forwarding Engine.
Reference: Operational Monitoring and Maintenance, Real-time Interface Monitoring.


69. Frage

The MX204 has 12 built-in ports. Referring to the exhibit, to which interface does the arrow point?

Antwort: A

Begründung:
The Juniper MX204 is a fixed-configuration router that utilizes a specific hierarchical naming convention for its physical interfaces: type-fpc/pic/port. In the MX204 architecture, there is a single built-in Flexible PIC Concentrator (FPC), which is always designated as FPC 0 . This FPC is subdivided into two logical Physical Interface Cards (PICs): PIC 0 and PIC 1 .
As shown in the exhibit, PIC 0 contains four high-speed ports (labeled 0/0 through 0/3) that typically support
40GbE or 100GbE speeds. PIC 1 contains eight ports (labeled 1/0 through 1/7) designed for 1GbE or 10GbE connectivity. These ports are arranged in a stacked, $2 \times 4$ grid. The labeling system on the chassis indicates the port numbers for each column. In the fourth column of the PIC 1 block, the top port is identified as 1/6 and the bottom port as 1/7 .
The blue arrow in the exhibit points directly to the bottom-right interface in the PIC 1 section. Correlating this physical location with the chassis labels confirms that the port number is 7. When combined with the FPC and PIC identifiers, the full interface name is xe-0/1/7 (assuming a 10GbE transceiver is installed). Understanding this physical-to-logical mapping is essential for accurate cabling and configuration within the Junos OS, ensuring that administrators apply the correct logical unit and protocol settings to the intended physical hardware.
Reference: Junos OS Fundamentals, Interface Naming, MX204 Hardware Overview.


70. Frage
Your switch01 device lost network connectivity after a configuration change. You must recover the device to a known working state using the rescue configuration that was previously saved.
The device is only accessible using the console. In this scenario, which command sequence will successfully restore the rescue configuration?

Antwort: B

Begründung:
The load override rescue command loads the saved rescue configuration into the candidate configuration, replacing the current configuration, and committing it restores the device to the known working state.


71. Frage
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