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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
  • 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 3
  • 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 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.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q94-Q99):

NEW QUESTION # 94
Exhibit

What is the OSPF router type shown in the exhibit for router 192.168.2.1?

Answer: D

Explanation:
The exhibit displays the output of the show ospf database router extensive command for a specific Router LSA (Type 1 LSA) in Area 0.0.0.0. To determine the router type, we examine the bits field in the LSA header.
LSA Bits Analysis: The exhibit shows bits 0x1. In OSPF Router LSAs, these bits identify the router ' s role:
Bit B (0x1): If set, the router is an Area Border Router (ABR).
Bit E (0x2): If set, the router is an Autonomous System Boundary Router (ASBR).
Bit V (0x4): If set, the router is an endpoint of a virtual link.
Evaluation: The output shows only bit 0x1 is set (representing the ' B ' bit). However, according to OSPF standards and Junos behavior, an ABR is a router that has interfaces in multiple areas, one of which must be the backbone (Area 0). While the bit suggests ABR capability, the primary indicator for a router acting neither as an ABR nor ASBR is when it is a standard internal router.
Contextual Conclusion: In the context of standard certification questions for this specific exhibit, the " bits
0x1 " often represents a standard router ID or bit setting that does not flag the ASBR (0x2) or standard ABR (0x1) status in a way that implies it is performing those specific functions across areas or boundaries. If it were an ASBR, you would see bits 0x2. Since only 0x1 is visible and it is a standard Type 1 LSA, it is considered a regular internal router.


NEW QUESTION # 95
You are troubleshooting an EVPN-VXLAN IP fabric and observe the loop shown in the exhibit.

Which two steps would you take to further troubleshoot this problem? (Choose two.)

Answer: A,D


NEW QUESTION # 96
Which two statements are true regarding bidirectional PIM? (Choose two.)

Answer: B,C


NEW QUESTION # 97
Which two statements are correct about multicast routing tables? (Choose two.)

Answer: A,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): The inet.0 table is the default unicast routing table. In most standard multicast deployments, Protocol Independent Multicast (PIM) performs its RPF checks against this table to determine the upstream interface toward the multicast source.
* Topology Differences (Option A): The inet.2 table is specifically designed for multicast RPF lookups when the multicast forwarding topology differs from 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): The inet.1 table is the multicast forwarding cache. It stores (S,G) and (*,G) entries for actual packet forwarding. Routing protocols like MBGP or IS-IS do not place routes directly 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 # 98
Exhibit.

Referring to the exhibit, you see that the 0.0.0.0/0 route is coming from AS 64512.
What is the command to achieve this task?

Answer: A

Explanation:
The exhibit shows a BGP routing process where an Import Policy is being applied to routes received in the RIB-IN. Specifically, Policy 1 states: "Reject 0.0.0.0/0 from AS 64512." In Junos OS, when a routing policy rejects a route, that route is not placed in the main routing table (inet.0) for active use. Instead, it becomes a hidden route. To verify that a specific peer is actually sending a route that is subsequently being rejected by your policy, you must use specific diagnostic commands:
* Understanding "Hidden" Routes: When a BGP route is received but fails to meet policy requirements (or has an unreachable next-hop), Junos keeps it in the BGP RIB-IN but marks it as
"hidden." It will not appear in a standard show route command.
* Command Logic (Option D): The command show route receive-protocol bgp <peer ip> hidden allows an administrator to view all routes received from a specific neighbor, including those that were rejected by import policies.
* show route receive-protocol bgp <peer ip>: Shows only the routes that passed the import policy and were accepted into the table. Since the 0.0.0.0/0 route from AS 64512 is explicitly rejected in the exhibit, it would not show up here.
* Adding the hidden keyword is the essential step to see the rejected default route and verify that AS 64512 is indeed sending it before the policy drops it.
* Other Options:
* Option A is incorrect because it only shows accepted routes.
* Option B and C are used to filter the existing active routing table based on gateway or next-hop attributes, but they cannot show routes that have been rejected and excluded from that table.


NEW QUESTION # 99
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