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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
  • 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.
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.

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

NEW QUESTION # 97
You are implementing 802.1x authentication in your Layer 2 network. Each user will have a computer and a phone and you must ensure that both device are authenticated individually.
In this scenario, which supplicant mode should be used?

Answer: D


NEW QUESTION # 98
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.)

Answer: B,C

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 # 99
You have created a private community VLAN called RND The private community VLAN works fine within switch S1, but traffic in the private RND community VLAN does not reach VLAN members connected to switch S2.
Which statement is correct in this scenario?

Answer: D


NEW QUESTION # 100
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):Theinet.0table is the default unicast routing table. In most standard multicast deployments, Protocol Independent Multicast (PIM) performs itsRPF checksagainst this table to determine the upstream interface toward the multicast source.
* Topology Differences (Option A):Theinet.2table is specifically designed for multicast RPF lookups when themulticast forwarding topology differsfrom 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):Theinet.1table is themulticast forwarding cache. It stores (S,G) and (*,G) entries for actual packet forwarding. Routing protocols like MBGP or IS-IS do not place routesdirectly 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 # 101
In a Junos device, which statement is correct for configuring a Level 1 IS-IS router?

Answer: D


NEW QUESTION # 102
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