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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Ethernet Switching and Spanning Tree: This section covers advanced Layer 2 switching including filter-based VLANs, private VLANs, MVRP, Layer 2 tunneling via Q-in-Q and L2PT, plus MSTP and VSTP protocols.
Topic 2
  • Interior Gateway Protocols (IGPs): This domain covers internal routing protocols operating within a single autonomous system, including OSPFv2, OSPFv3, and routing policy implementation, along with configuration, troubleshooting, and monitoring skills.
Topic 3
  • EVPN: This section addresses Ethernet VPN technology for Layer 2 over Layer 3 connectivity, covering EVPN route types, VXLAN encapsulation, and multi-homing configurations.
Topic 4
  • BGP: This section focuses on Border Gateway Protocol operations including route selection, next hop resolution, BGP attributes, communities, load balancing, IPv4
  • IPv6 address families, advanced options, and routing policy implementation.
Topic 5
  • Class of Service (CoS): This domain covers QoS mechanisms in Junos including CoS processing, header fields, forwarding classes, classification, policers, schedulers, drop profiles, shaping, and rewrite rules.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q16-Q21):

NEW QUESTION # 16
How does the Any-Source Multicast (ASM) model differ from the Source-Specific Multicast (SSM) model?

Answer: B


NEW QUESTION # 17
Exhibit.

Referring to the exhibit. Ieaf2 is elected the designated forwarder
Which two statements are correct if server2 generates a broadcast frame*? (Choose two.)

Answer: A,D

Explanation:
The exhibit illustrates an EVPN-VXLAN fabric using multi-homing. Server1 is dual-homed to Leaf1 and Leaf2 using an Ethernet Segment Identifier (ESI) in an active-active or active-standby configuration. Server2 is single-homed to Leaf3.
In EVPN environments, specific mechanisms are used to prevent loops and duplicate traffic when dealing with Broadcast, Unknown Unicast, and Multicast (BUM) traffic:
Broadcast Propagation (Option A): When Server2 (connected to Leaf3) generates a broadcast frame, Leaf3 encapsulates this traffic into a VXLAN tunnel and forwards it to all other VTEPs (Virtual Tunnel End Points) that participate in that specific Virtual Network Instance (VNI). Therefore, both Leaf1 and Leaf2 will receive the broadcast frame from the core fabric.
Designated Forwarder (DF) Election (Option C): To prevent a multi-homed device (like Server1) from receiving duplicate copies of the same broadcast frame from multiple leaf switches, EVPN utilizes a Designated Forwarder (DF). For a given ESI, only one leaf switch is elected as the DF.
The exhibit explicitly states that Leaf2 is the Designated Forwarder.
According to the Junos EVPN implementation, only the DF is responsible for decapsulating BUM traffic received from the core and forwarding it to the local access segment.
While Leaf1 receives the frame (Option A), it will see that it is not the DF for that segment and will drop the frame rather than forwarding it to Server1. This ensures Server1 receives exactly one copy of the broadcast, delivered by Leaf2.
Option B is incorrect because in a standard ingress replication or multicast-based underlay, all VTEPs in the VNI receive the broadcast.
Option D is incorrect because Leaf1 is the non-designated forwarder (non-DF) for this segment and is prohibited from forwarding BUM traffic to the ESI.


NEW QUESTION # 18
Exhibit
You are asked to configure VLAN load balancing on your network using MSTP. Referring to the exhibit, which two statements are correct? (Choose two.)

Answer: B,C

Explanation:
The exhibit shows the MSTP configuration for two switches,switch1andswitch2. MSTP allows you to group multiple VLANs into a single Multiple Spanning Tree Instance (MSTI), enabling different root bridges and topologies for different sets of VLANs.
* Root Bridge Election (Option B):For any Spanning Tree instance, the switch with thelowest bridge priorityis elected as the root bridge.
* Formsti 2, switch1 has a priority of4k(4096), while switch2 has a priority of8k(8192).
* Since 4096 < 8192,switch1 is elected the root bridge for msti 2.
* Failover Behavior (Option D):Spanning Tree is designed for redundancy. If a primary root bridge fails, the remaining switches in the network re-elect a new root based on the next lowest priority.
* Ifswitch2goes down, switch1 becomes the only switch in the region.
* Regardless of its original priority (4k or 8k), switch1 will take over as theroot bridge for both msti 1 and msti 2because there are no other contenders with a better (lower) priority.
* Incorrect Statements:Option Ais incorrect because for msti 1, switch2 has the lower priority (4k vs.
8k), making switch2 the root bridge.Option Cis incorrect because it contradicts the fundamental high- availability nature of Spanning Tree.


NEW QUESTION # 19
You want to validate a recursive lookup for an EVPN route designation. Which route table query will accomplish this task?

Answer: A

Explanation:
In Junos OS, particularly in BGP-based environments like EVPN-VXLAN or MPLS, the router often needs to perform arecursive lookupto resolve the BGP next-hop of a route.
* Next-Hop Resolution (Option C):When an EVPN route (found in default-switch.evpn.0) is received, the protocol next-hop is typically the loopback IP of the remote VTEP. To actually forward traffic, the switch must know how to reach that loopback IP.
* Theinet.3table is the default table in Junos used to store egress interface information for BGP next-hops.
* While inet.0 handles standard unicast routing, inet.3 is specifically consulted for resolving the path toward BGP peers. In an EVPN context, this ensures that the VXLAN tunnel endpoint is reachable and properly resolved through the underlay.
* Other Tables:*inet.2 (Option A)is used for Multicast RPF checks.
* default-switch.evpn.0 (Option B)stores the EVPN routes themselves (MAC/IP), but it is the sourceof the lookup, not the table where the recursive resolution occurs.
* vxlan.inet (Option D)is an internal table used to track active VXLAN tunnels but is not the primary table for recursive BGP next-hop validation.


NEW QUESTION # 20
In the context of Junos, what is the purpose of the 'multicast' routing-options configuration hierarchy?

Answer: C


NEW QUESTION # 21
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