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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
  • 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 3
  • 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.
Topic 4
  • 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 5
  • 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 6
  • IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
  • LLDP-MED protocols, and voice VLAN implementation.
Topic 7
  • 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.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q97-Q102):

NEW QUESTION # 97
Exhibit
Referring to the exhibit. R2 receives a packet from the multicast source on its ge-0/0/4 0 interface.
Which two statements are correct in this scenario? (Choose two.)

Answer: B,C

Explanation:
The exhibit illustrates a PIM multicast environment where routerR2has received a multicast packet from Source 1 (192.168.100.10)on itsge-0/0/4.0interface. To prevent loops, PIM-SM uses a mechanism called Reverse Path Forwarding (RPF).
* RPF Check Process (Option A):When a multicast packet arrives, the router performs an RPF check by looking up the source's IP address in itsunicast routing table(typically inet.0).
* The exhibit's command output, show multicast rpf 192.168.100.10, explicitly shows that for the source network $192.168.100.0/24$, theRPF interfaceisge-0/0/1.0.
* Because the packet actually arrived onge-0/0/4.0instead of the expected ge-0/0/1.0 interface, the RPF check fails.
* Packet Discard (Option C):According to standard PIM-SM operation in Junos OS 24.4, if a multicast packet fails the RPF check-meaning it arrived on an interface that the router does not use to reach the source via unicast-the packet isdiscarded. This is a fundamental loop-prevention mechanism that ensures multicast traffic is only accepted from the shortest path toward the source.
* Option B is incorrectbecause the router will not add any interfaces to the Outgoing Interface List (OIL) for a packet that fails the initial RPF check.
* Option D is incorrectbecause the exhibit clearly shows the interface in the RPF table (ge-0/0/1.0) is different from the interface where the packet was received (ge-0/0/4.0).


NEW QUESTION # 98
Which two statements are true regarding BGP route updates? (Choose two.)

Answer: A,D


NEW QUESTION # 99
While deploying class of service on an EX Series switch, what are two aspects of the scheduler?
(Choose two.)

Answer: A,C


NEW QUESTION # 100
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 anEVPN-VXLANfabric using multi-homing. Server1 is dual-homed to Leaf1 and Leaf2 using anEthernet 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 aDesignated Forwarder (DF). For a given ESI, only one leaf switch is elected as the DF.
* The exhibit explicitly states thatLeaf2 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 incorrectbecause in a standard ingress replication or multicast-based underlay, all VTEPs in the VNI receive the broadcast.
* Option D is incorrectbecause Leaf1 is the non-designated forwarder (non-DF) for this segment and is prohibited from forwarding BUM traffic to the ESI.


NEW QUESTION # 101
You are deploying IP phones in your Layer 2 network and are asked to ensure that the switch sends VLAN and CoS information to the IP phones automatically.
In this scenario, which protocol should be used?

Answer: C


NEW QUESTION # 102
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