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Juniper JN0-650 Exam Syllabus Topics:

Topic	Details
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	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	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	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 (Q88-Q93):

NEW QUESTION # 88
In multicast networking, what is IGMP used for?

A. Providing authentication for multicast sources
B. Routing multicast traffic between routers
C. Advertising multicast routes to external networks
D. Managing host group memberships on a local network segment

Answer: D

NEW QUESTION # 89
In Junos, which configuration statement is used to enable IGMP snooping on a switch?

A. set protocols ospf area 0.0.0.0
B. set routing-options multicast
C. set protocols igmp-snooping vlan all
D. set protocols bgp group external

Answer: C

NEW QUESTION # 90
You are asked to establish full connectivity between all devices in the BGP network. Referring to the exhibit, which two configuration changes will allow BGP route advertisements? (Choose two.)

A. On R2, include the advertise-peer-as statement at the [edit protocols bgp group external] hierarchy.
B. On R2, include the loops 2 statement at the [edit protocols bgp family inet unicast] hierarchy.
C. On R1 and R3, include the loops 2 statement at the [edit protocols bgp family inet unicast] hierarchy.
D. On R1 and R3, include the advertise-peer-as statement at the [edit protocols bgp group external] hierarchy.

Answer: A,C

NEW QUESTION # 91
Exhibit:

Referring to the exhibit, you are receiving multiple routes from ISP3 through two EBGP neighbors. You must ensure that all traffic leaving R1 destined to the networks advertised by ISP3 go through ISP2. What should you do on R1 to accomplish this task?

A. Create and apply an import policy to set the route preference on routes learned from ISP2 to be lower than those learned from ISP1.
B. Create and apply an import policy to set the local preference on routes learned from ISP2 to be lower than those learned from ISP1.
C. Create and apply an import policy to set the route preference on routes learned from ISP2 to be higher than those learned from ISP1.
D. Create and apply an import policy to set the local preference on routes learned from ISP2 to be higher than those learned from ISP1.

Answer: D

NEW QUESTION # 92
Your OSPF network consists of a mix of 1GbE and 10GbE interfaces. By default, all interfaces have the same cost in your OSPF network. You are asked to ensure that the 10GbE interfaces are more preferred when available In this scenario, which two statements would accomplish this behavior? (Choose two.)

A. You should manually assign the interface metric for each 1GbE interface to be higher than the 10GbE interfaces in your OSPF network.
B. You should define the reference bandwidth as 10G. which will assign the 1GbE interfaces a higher cost
C. You should define the reference bandwidth as 1G. which will assign the 1GbE interfaces a higher cost.
D. You should manually assign the interface metric for each 10GbE interface to be higher than the 1GbE interfaces in your OSPF network.

Answer: A,B

Explanation:
OSPF determines the best path to a destination by calculating the metric (cost) of each link. By default, Junos OS uses a reference bandwidth of 100 Mbps to calculate this cost using the formula:

When the reference bandwidth is left at the default 100 Mbps, any interface with a speed of 100 Mbps or higher (including 1 GbE and 10 GbE) is assigned a cost of 1 because the minimum OSPF cost is 1. This results in equal-cost paths, preventing the router from preferring the faster 10 GbE link.
To ensure 10 GbE interfaces are preferred, you must create a cost differential:
Option A (Reference Bandwidth): By increasing the reference bandwidth to 10G (or higher), the calculation changes. For a 10 GbE link, the cost becomes $10,000 / 10,000 = 1$. For a 1 GbE link, the cost becomes
$10,000 / 1,000 = 10$. Since OSPF prefers the path with the lowest cumulative cost, the 10 GbE link is now preferred.
Option D (Manual Metric): You can manually override the automatic cost calculation by assigning a higher metric specifically to the 1 GbE interfaces. If a 1 GbE interface is manually set to a cost of 50 and the 10 GbE interface remains at 1 (or is set to a lower value), the router will prioritize the 10 GbE path.
Option B is incorrect because a higher metric makes a path less preferred. Option C is incorrect because a 1G reference bandwidth would still result in both 1 GbE and 10 GbE interfaces having a cost of 1.

NEW QUESTION # 93
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