Latest JN0-650 Practice Questions & Valid JN0-650 Test Topics

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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 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
  • IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
  • LLDP-MED protocols, and voice VLAN implementation.
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
  • 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 (Q84-Q89):

NEW QUESTION # 84
Referring to the exhibit, which two statements are correct? (Choose two.)

Answer: A,D

Explanation:
DS1 - root bridge for msti 1 (vlan 10-19) - due to bridge priority 4k
DS2 - root bridge for msti 2 (vlan 20-29) - due to bridge priority 4k


NEW QUESTION # 85
Exhibit.

You have determined that traffic in your network is being routed through your route reflector instead of using the optimal path. Referring to the exhibit, what are two configuration changes on the route reflector that would solve the problem? (Choose two.)

Answer: C,D

Explanation:
The exhibit shows a BGP Route Reflector (RR) configuration where an export policy named NHS (Next-Hop Self) is applied to the internal BGP group int-group. The policy NHS sets the next-hop self attribute for BGP routes.
The Problem (Traffic Tromboning): In a standard BGP Route Reflector design, the RR should reflect routes without modifying the BGP next-hop attribute. By applying a next-hop self policy on the export to clients, the RR tells all its clients that it is the exit point for those routes. Consequently, all data plane traffic is sent to the RR first before being forwarded to the actual destination, rather than following the optimal direct path between clients. This is known as " traffic tromboning " or suboptimal routing.
The Solution (Option C): The most direct way to fix this is to delete the export policy that is forcing the next- hop to be the RR. By deleting protocols bgp group int-group export NHS, the RR will resume standard behavior and reflect the original next-hop received from the route source, allowing clients to route traffic directly to the correct destination.
The Refined Solution (Option D): If you must keep the NHS policy (perhaps for routes learned from external peers), you should ensure it only applies to those specific routes. By adding from route-type internal to the policy term and then potentially changing the logic (or simply narrowing the scope), you can prevent the RR from incorrectly applying next-hop self to internal routes that it is merely reflecting. In the context of this specific problem, Option D combined with a change in the policy ' s action or scope helps ensure reflected internal routes maintain their original, optimal next-hops.
Option A is incorrect because setting next-hop self for external routes is common practice, but it doesn ' t solve the problem of internal reflected routes being diverted to the RR.
Option B is incorrect because applying this as an import policy would change how the RR itself sees the routes, but it wouldn ' t fix the attributes being sent out to the clients in the reflection process.


NEW QUESTION # 86
How is MSDP used in conjunction with PIM-SM?

Answer: D


NEW QUESTION # 87
While reviewing routing information on your router, you notice that the routing table has a hidden BGP route. In this scenario, what are two reasons for this behavior? (Choose two.)

Answer: B,D

Explanation:
A BGP route is hidden if the AS path contains an AS number of 0 because AS 0 is reserved and considered invalid in BGP routing information.
A BGP route is also hidden when the next hop is unreachable, since the router cannot install the route into the forwarding table without valid next-hop resolution.


NEW QUESTION # 88
Exhibit

Your network receives the full Internet BGP routing table from two different ISPs. You want your local routers to use Provider A to forward all Internet traffic as long as Provider A is available.
Referring to the exhibit, which two actions would satisfy this requirement? (Choose two.)

Answer: C,D

Explanation:
In BGP path selection, the Local Preference attribute is one of the most common ways to influence outbound traffic from an Autonomous System (AS). It is a well-known discretionary attribute that is propagated throughout the AS to tell internal routers which path is preferred for a specific destination.
Priority Rule: In the BGP selection algorithm, a higher local preference value is always preferred over a lower one. The default value in Junos OS is 100.
Influencing Outbound Traffic (Option A): To ensure that Provider A is always preferred, you would apply an import policy on R1 (the router connected to Provider A) to set the local preference of all received routes to a value higher than the default (e.g., 200). Since 200 > 100, R3 and R4 will prefer the path via R1.
Alternative Method (Option C): Conversely, you can achieve the same result by applying an import policy on R2 (the router connected to Provider B) to set the local preference to a value lower than the default (e.g., 50).
Since the routes from R1 remain at the default of 100, and 100 > 50, the path via R1 (Provider A) is preferred.
Why B and D are incorrect: Setting a higher local preference on R2 (Option B) would make Provider B the preferred exit point. Setting a lower local preference on R1 (Option D) would make Provider A the least preferred exit point.


NEW QUESTION # 89
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