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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
  • LLDP-MED protocols, and voice VLAN implementation.
Topic 2
  • 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 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
  • 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 5
  • 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 6
  • 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.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q46-Q51):

NEW QUESTION # 46
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,D

Explanation:
The exhibit illustrates a PIM multicast environment where router R2 has received a multicast packet from Source 1 (192.168.100.10) on its ge-0/0/4.0 interface. 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 its unicast routing table (typically inet.0).
The exhibit ' s command output, show multicast rpf 192.168.100.10, explicitly shows that for the source network $192.168.100.0/24$, the RPF interface is ge-0/0/1.0.
Because the packet actually arrived on ge-0/0/4.0 instead 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 is discarded. This is a fundamental loop-prevention mechanism that ensures multicast traffic is only accepted from the shortest path toward the source.
Option B is incorrect because 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 incorrect because 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 # 47
Which two statements are correct when using the no-loss forwarding class? (Choose two.)

Answer: A,C

Explanation:
In Junos OS 24.4, theno-loss forwarding classis used for traffic that requires lossless delivery, such as iSCSI or FCoE, typically in a Data Center Bridging (DCB) environment.
* Priority-Based Flow Control (Option C):To guarantee "no-loss" behavior, the switch must support and usePriority-based Flow Control (PFC). PFC allows the switch to send "pause" frames for a specific priority (forwarding class) to prevent buffer overflow and packet drops without affecting other traffic on the same link.
* Forwarding Class Sets (Option B):In enhanced Layer 2 software (ELS) versions used by modern QFX and EX series switches, lossless traffic must be managed withinforwarding class sets(also known as priority groups). This grouping is necessary to apply specific DCB properties, such as PFC and specific bandwidth guarantees, to the lossless traffic class.
* Why A and D are incorrect:Default scheduler maps and default drop profiles do not provide the specialized buffer management or lossless signaling required for this class. Lossless traffic specifically requires thesuppression of tail dropsrather than standard drop profiles.


NEW QUESTION # 48
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: B,C

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 # 49
You are deploying IP phones in your enterprise networks. When plugged in, the IP phones must be automatically provided with the correct VLAN ID needed for sending voice traffic to the EX Series switches.
In this scenario, which two solutions are required to accomplish this task? (Choose two.)

Answer: C,D


NEW QUESTION # 50
What are two supported PoE management modes? (Choose two.)

Answer: A,B


NEW QUESTION # 51
......

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