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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 2
  • Layer 2 Authentication and Access Control: This domain examines network access control mechanisms including 802.1x, MAC RADIUS, captive portal, server fail fallback, guest VLANs, and multi-method authentication considerations.
Topic 3
  • 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 4
  • IP Multicast: This domain addresses one-to-many communication using multicast routing, covering addressing, ASM vs SSM models, RPF, IGMP
  • snooping, PIM sparse-mode, rendezvous points, Anycast RP, MSDP, and routing policies.
Topic 5
  • 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 6
  • 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 (Q84-Q89):

NEW QUESTION # 84
Which two statements are correct about multicast routing tables? (Choose two.)

Answer: C,D

Explanation:
Junos OS uses specific routing tables for handling multicast traffic to ensure loop prevention through Reverse Path Forwarding (RPF) checks:
* Multicast RPF (Option C):Theinet.0table is the default unicast routing table. In most standard multicast deployments, Protocol Independent Multicast (PIM) performs itsRPF checksagainst this table to determine the upstream interface toward the multicast source.
* Topology Differences (Option A):Theinet.2table is specifically designed for multicast RPF lookups when themulticast forwarding topology differsfrom the unicast forwarding topology. This is common in environments using Multiprotocol BGP (MBGP) where you might want multicast traffic to follow a different path than standard data traffic.
* inet.1 Role (Option B):Theinet.1table is themulticast forwarding cache. It stores (S,G) and (*,G) entries for actual packet forwarding. Routing protocols like MBGP or IS-IS do not place routesdirectly into inet.1; instead, PIM uses information from inet.0 or inet.2 to populate inet.1.
* IS-IS and OSPFv3 (Option D):These protocols place their IPv4/IPv6 unicast routes into inet.0 or inet6.
0. They do not place routes into inet.2 "directly" unless specific RIB-group configurations or address families are enabled to share those routes for multicast RPF purposes.


NEW QUESTION # 85
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,B

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 # 86
You need to perform maintenance on one of your OSPF routers. You do not want the other OSPF routers on the network to forward traffic to this router dunng the maintenance window Which OSPF configuration parameter would you implement to accomplish this task?

Answer: A

Explanation:
For maintenance scenarios where a router must remain operational but should not be used as a transit path for OSPF traffic, Junos OS uses theoverloadfunctionality.
* OSPF Overload (Option B):When you enable overload under protocols ospf, the router advertises its own Link-State Advertisements (LSAs) with amaximum metric (65535)for all of its transit links.
* Traffic Diversion:Because OSPF uses the Shortest Path First (SPF) algorithm to find the lowest-cost path, other routers in the network will see the overloaded router as an extremely high-cost path. They will calculate alternate routes, effectivelymoving transit traffic off the routerwhile still allowing management traffic directedtothe router's own interfaces.
* Timeout Options:You can configure this to be permanent or set a timeout so that the router automatically resumes normal metric advertisements after a set period.


NEW QUESTION # 87
Which two statements are true regarding hierarchical queuing? (Choose two.)

Answer: A,D


NEW QUESTION # 88
What are two characteristics of an access port on a Juniper switch? (Choose two.)

Answer: B,C


NEW QUESTION # 89
......

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