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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Junos, Associate (JNCIA-Junos) |
| Exam Number: | JN0-106 |
| Exam Format: | Multiple Choice |
| Related Certifications: | JNCIS-SP JNCIS-ENT JNCIA-Junos |
| Certificate Validity Period: | 3 years |
| Passing Score: | Pass or Fail |
| Real Exam Qty: | 65 |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Exam Price: | $200 USD |
| Sample Questions: | Juniper JN0-106 Sample Questions |
| Exam Way: | Pearson VUE Test Center or Online Proctored Exam |
| Pre Condition: | No prerequisite certification required |
| Official Syllabus URL: | https://learningportal.juniper.net/juniper/user_activity_info.aspx?id=14354 |
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NEW QUESTION # 74
Which protocol is responsible for learning an IPv4 neighbor's MAC address?
Answer: D
Explanation:
The Address Resolution Protocol (ARP) is a fundamental protocol used in IPv4 networking to map an IP address to its corresponding MAC (Media Access Control) address. When an IPv4 device wants to communicate with another device on the same local network, it uses ARP to find out the MAC address associated with the target device's IP address. This ensures that IP packets can be encapsulated into Ethernet frames and delivered to the correct hardware address on the local network segment. ARP does not apply to IPv6, where Neighbor Discovery Protocol (NDP) performs a similar function.
NEW QUESTION # 75
When considering routing policies, which two statements are correct? (Choose two.)
Answer: C,D
Explanation:
Routing policies in Junos OS are crucial for controlling route advertisements and path selection.
The correct answers are B and C.
An import routing policy for BGP determines which received prefix advertisements are placed in the routing information base (RIB), and policy terms are evaluated from top to bottom, with action taken on the first match found. This sequential evaluation allows for precise control over routing decisions.
NEW QUESTION # 76
Which statement describes the primary purpose of a routing policy in Junos OS?
Answer: B
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 # 77
Which statement is correct when Router R1 receives a packet from User A destined for User B as shown in the exhibit?
Answer: B
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 # 78
What are two functions of the Routing Engine? (Choose two.)
Answer: A,B
Explanation:
The Routing Engine (RE) is the " brains " of a Juniper device, representing the control plane in the Junos dual-plane architecture. One of its primary functions is that it runs the Junos OS . The RE is essentially a high-performance workstation running a specialized version of FreeBSD that hosts the various software daemons responsible for the device ' s logic, such as the Routing Protocol Process (rpd) and the Device Control Process (dcd).
The second core function is that the RE processes all management traffic . Any packet destined for the router itself-such as an SSH session, an SNMP poll, a NETCONF request, or an NTP update-is handled by the Routing Engine ' s CPU. The RE also maintains the master routing table, manages configuration commits, and provides the CLI environment for the administrator.
It is critical to distinguish these control-plane duties from the duties of the Packet Forwarding Engine (PFE)
. The PFE is responsible for the " heavy lifting, " such as processing transit traffic (data passing through the router) and evaluating firewall filters at wire speed. While the RE defines the policies and routing tables, it hands off a streamlined version of this information to the PFE so the RE isn ' t bogged down by millions of individual packets. This separation ensures that a busy management session or a complex routing calculation on the RE doesn ' t impact the device ' s ability to forward traffic at maximum capacity.
Reference: Junos OS Fundamentals, Control Plane and Forwarding Plane.
NEW QUESTION # 79
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