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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | JNCIA-Junos (Junos, Associate) Exam |
| Exam Number: | JN0-106 |
| Certificate Validity Period: | 3 years |
| Exam Price: | $200 USD (may vary by region) |
| Exam Format: | Multiple choice, Scenario-based questions |
| Exam Duration: | 90 minutes |
| Passing Score: | Approximately 60–70% (exact score not publicly fixed) |
| Available Languages: | English |
| Real Exam Qty: | Approximately 65 multiple-choice questions |
| Related Certifications: | JNCIE-Junos JNCIP-Junos JNCIS-Junos |
| Recommended Training: | Juniper Official JNCIA-Junos Training Juniper Day One Books (Junos Fundamentals) |
| Exam Registration: | Juniper Certification Portal Pearson VUE Exam Registration |
| Sample Questions: | Juniper JN0-106 Sample Questions |
| Exam Way: | Computer-based testing at authorized testing centers or online proctored exam (availability may vary by region). |
| Pre Condition: | No formal prerequisites required; basic networking knowledge recommended. |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/certification-tracks/junos-certification-track.html |
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NEW QUESTION # 59
Which statement about class of service (CoS) in a network is correct?
Answer: B
Explanation:
Class of Service (CoS) is a fundamental suite of features in Junos OS designed to manage traffic patterns during periods of network congestion. Rather than treating all packets equally, CoS allows the Packet Forwarding Engine (PFE) to differentiate between various types of traffic-such as latency-sensitive Voice over IP (VoIP), critical routing protocol updates, and standard " best-effort " internet traffic-and prioritize them accordingly. When egress interface buffers become saturated, the CoS mechanism uses defined schedulers and queues to ensure that high-priority packets are transmitted first, while less critical traffic may be delayed or dropped.
It is important to distinguish CoS from security or addressing functions. CoS does not provide encryption services (which is the role of IPsec or MACsec), nor does it manage IP address allocation or VLAN segmentation. Instead, it focuses entirely on the intelligent allocation of bandwidth and buffer resources. By implementing CoS, network architects can guarantee a specific level of performance for mission-critical applications, effectively minimizing jitter and packet loss for the most important data streams. This deterministic behavior is vital for modern converged networks where multiple traffic types compete for limited hardware resources across the switch fabric or WAN links. Reference: Junos OS Fundamentals, Class of Service (CoS) Overview.
NEW QUESTION # 60
Which Junos OS routing instance type is used for non-VPN-related applications such as system virtualization?
Answer: B
NEW QUESTION # 61
Referring to the exhibit.
[edit]
root# set system host-name TEST_DEVICE
[edit]
root# commit
[edit]
'system'
Missing mandatory statement: 'root-authentication'
error: commit failed: (missing mandatory statements)
[edit]
root#
You are configuring a new device. Which action solves the error shown in the exhibit?
Answer: C
Explanation:
The error message in the exhibit indicates that the root-authentication statement is missing, which is mandatory for committing the configuration. In Junos OS, it is required to set a password for the root account to commit any configuration changes. This is a security measure to ensure that unauthorized users cannot access the device's configuration mode. To solve the error shown in the exhibit, configuring a password for the root account is necessary. This can be done by using the set system root-authentication plain-text-password command, after which the user will be prompted to enter a new password for the root account.
NEW QUESTION # 62
Which statement describes the primary purpose of a routing policy in Junos OS?
Answer: A
Explanation:
In Junos OS, a routing policy is a powerful tool used to manage the flow of routing information between the Routing Information Base (RIB) and routing protocols. Unlike forwarding decisions, which are handled by the Packet Forwarding Engine, routing policies function within the control plane on the Routing Engine. Their primary purpose is to define specific criteria for importing routes into the routing table from neighbors or exporting routes from the routing table to neighbors.
Routing policies consist of terms containing from (match) and then (action) statements. They allow administrators to filter prefixes (e.g., denying specific BGP routes), modify route attributes (e.g., changing OSPF metrics or BGP communities), and manipulate path selection behavior. For example, an export policy might be used to ensure that only specific internal subnets are advertised to an ISP via BGP, preventing the accidental leakage of private infrastructure addresses. By default, Junos applies "default policies" for each protocol (such as OSPF accepting all OSPF routes), but custom policies allow for granular control over how the device interacts with the rest of the network. This ensures that the routing table contains only the desired paths for optimal traffic engineering.
NEW QUESTION # 63
What are two characteristics of IPv6 addressing? (Choose two.)
Answer: C,D
Explanation:
IPv6 introduces several fundamental shifts in networking architecture compared to its predecessor, IPv4. The most prominent characteristic is the address length; IPv6 utilizes a 128-bit address space, represented in hexadecimal notation across eight groups of 16 bits. This massive expansion from IPv4 ' s 32-bit limit was designed to ensure long-term address availability for the global internet and the growing ecosystem of connected devices.
Another defining characteristic of IPv6 is the concept of address scope, particularly regarding link-local addresses . Any IPv6 address beginning with the fe80::/10 prefix is classified as link-local. These addresses are automatically configured on every IPv6-enabled interface and are strictly not routable beyond the local physical or logical link segment. They are essential for local link operations such as neighbor discovery and routing protocol adjacency formation.
Architecturally, IPv6 also improves performance by streamlining the packet header. Unlike IPv4, the IPv6 header does not include a checksum, as modern link-layer (Layer 2) and transport-layer (Layer 4) protocols perform their own error checking, making a redundant header checksum unnecessary at the network layer.
Additionally, IPv6 replaces the broadcast-based Address Resolution Protocol (ARP) with the multicast-based Neighbor Discovery Protocol (NDP). Understanding these core traits-massive address length and non- routable link-local scoping-is critical for managing modern Junos-based network infrastructures.
Reference: Networking Fundamentals, IPv6 Addressing and Characteristics.
NEW QUESTION # 64
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