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Juniper JN0-106 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 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.
Topic 3
  • 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.
Topic 4
  • 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.

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Juniper Junos, Associate (JNCIA-Junos) Sample Questions (Q91-Q96):

NEW QUESTION # 91
Which statement is correct when Router R1 receives a packet from User A destined for User B as shown in the exhibit?

Answer: C

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From: In a routed environment like the one shown in the exhibit, traffic forwarding involves a constant interaction between Layer 3 (Network) and Layer
2 (Data Link) addressing. When User A generates a packet destined for User B, the source and destination IP addresses remain static throughout the entire journey across the network (assuming no Network Address Translation is performed). However, the Layer 2 Ethernet headers must be rewritten at every hop because MAC addresses have only local significance on a physical segment.
As Router R1 receives the packet from User A, it performs a lookup in its Forwarding Information Base (FIB) and identifies that the path to User B requires forwarding the packet to Router R2. R1 decapsulates the incoming frame, stripping away the original Ethernet header that contained User A ' s source MAC and R1 ' s own destination MAC. To forward the packet to the next hop, R1 creates a new Ethernet header. The source MAC address becomes the MAC address of R1's egress interface, and the destination MAC address is replaced with the MAC address of Router R2 . R1 cannot use User B ' s MAC address at this point because User B is not on a directly connected segment. This hop-by-hop MAC address replacement is essential for the Packet Forwarding Engine to successfully deliver the frame to the next Layer 3 device in the path. Reference:
Networking Fundamentals, Packet Forwarding, Layer 2 and Layer 3 Addressing.


NEW QUESTION # 92
A network administrator must set up the initial configuration of the out-of-band management interface on a new Juniper router to ensure management traffic is isolated from the default routing table (inet.0). In this scenario, which configuration step is required to accomplish this task in Junos OS?

Answer: A

Explanation:
In modern Junos OS versions, the most efficient and standard way to isolate Out-of-Band (OOB) management traffic from transit traffic is by utilizing the management-instance . Historically, management interfaces like fxp0 (on M/MX/T series) or me0 (on EX/QFX series) shared the global routing table (inet.0), which could lead to routing conflicts if management subnets overlapped with production data.
To resolve this, Junos introduced the set system management-instance command. When this is enabled, the OS automatically creates a dedicated routing instance named mgmt_junos. The physical management interface (be it fxp0, em0, or me0) and its associated logical unit are moved into this private instance. This creates a complete separation: management protocols like SSH, SNMP, and NTP operate within mgmt_junos, while BGP, OSPF, and customer data remain in inet.0. This architecture ensures that even a massive routing loop or table exhaustion in the production plane will not prevent an administrator from accessing the device via the OOB port. Furthermore, it simplifies the configuration of default gateways for management traffic, as the mgmt_junos instance maintains its own independent routing table (mgmt_junos.inet.0), preventing management routes from ever being leaked into the provider core.
Reference: Operational Monitoring and Maintenance, Management Instance, OOB Management.


NEW QUESTION # 93
How many usable hosts are in a /24 subnet mask?

Answer: D

Explanation:
A /24 subnet provides 256 total IP addresses, and after excluding the network and broadcast addresses, 254 usable host addresses remain.


NEW QUESTION # 94
Which command displays the currently active configuration on a Junos device?

Answer: D

Explanation:
The show configuration command, when issued in operational mode, displays the active (committed) configuration currently running on the device.


NEW QUESTION # 95
Exhibit:

Referring to the exhibit, what is the next hop for IP address 10.0.0.9?

Answer: B

Explanation:
In Junos OS, the Packet Forwarding Engine (PFE) determines the next hop for a packet by performing a lookup in the forwarding table and identifying all valid matches for the destination IP address. When multiple routes encompass the same destination, the router strictly follows the Longest Prefix Match (LPM) rule to select the most specific entry.
For the destination address 10.0.0.9 , the following evaluation occurs based on the exhibit:
* 10.0.0.0/24 : This route matches, as the address falls within the 10.0.0.0-10.0.0.255 range.
* 10.0.0.0/26 : This route matches, as the address falls within the 10.0.0.0-10.0.0.63 range.
* 10.0.0.8/27 : This route matches, as the address falls within the 10.0.0.8-10.0.0.39 range.
* 10.0.0.4/30 : This route does not match, as its range ends at 10.0.0.7.
Among the matching entries, the prefix lengths are /24, /26, and /27. The longest prefix match is /27 , as it specifies the most granular network segment. Because 10.0.0.8/27 is the most specific match for the destination 10.0.0.9 , the router selects its associated next hop, which is 192.168.2.1 . This deterministic behavior ensures that traffic follows the most precise path calculated by the routing protocols or defined by the administrator, overriding broader routes like the default or summary advertisements.
Reference: Routing Fundamentals, Longest Prefix Match, Forwarding Table Selection.


NEW QUESTION # 96
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