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A Field Guide to JN0-650 All-in-One Exam Guide

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Juniper JN0-650 Exam Syllabus Topics:

Topic
Details

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

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 3

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 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

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 (Q57-Q62):

NEW QUESTION # 57
Which two statements correctly describe how EX Series switches use captive portal for Layer 2 authentication? (Choose two.)

A. The captive portal is the default Layer 2 authentication method that is applied before other methods such as 802 1X or MAC RADIUS.
B. The captive portal authentication allowlist works for devices that do not have HTTP capabilities.
C. The captive portal is configured on Layer 3 interfaces and does not participate in Layer 2 authentication on EX Series switches.
D. The captive portal is used as a fallback mechanism for clients that fail 802.1X or MAC RADIUS authentication.

Answer: B,D

Explanation:
In Junos OS 24.4, Captive Portal is used as a web-based authentication method for Layer 2 network access control, often in environments where 802.1X is not feasible for all users.
Fallback Mechanism (Option D): On EX Series switches, Juniper supports a flexible authentication order. By default, the switch attempts authentication in the order of 802.1X, then MAC RADIUS, and finally Captive Portal. If a client fails both 802.1X and MAC RADIUS, the switch can fall back to Captive Portal to redirect the user to a login page.
MAC Allowlist (Option B): Captive Portal relies on intercepting HTTP/HTTPS traffic to redirect users.
However, " headless " devices like printers or cameras lack web browsers and cannot interact with the portal.
To accommodate these, Junos allows administrators to configure an authentication allowlist (or whitelist), which identifies these devices by their MAC addresses and permits them to bypass the portal entirely.
Precedence (Option A): This is incorrect because Captive Portal is generally the last method in the default sequence, not the first.
Layer 2 Participation (Option C): While Captive Portal requires a Layer 3 interface (RVI/IRB) for the redirection process, it is explicitly used to control Layer 2 access on EX Series switches.

NEW QUESTION # 58
Which two statements are correct about multicast routing tables? (Choose two.)

A. inet. 2 is used when the multicast forwarding topology differs from unicast forwarding
B. MBGP and IS-IS place routes in met. l directly.
C. inet. 0 is used for RPF checks.
D. IS-IS and OSPFv3 place routes in met. 2 directly.

Answer: A,C

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 # 59
You have configured class mode power management on an EX4300 to provide PoE power to telephone and security camera equipment. You want to ensure that security camera power takes priority over telephone power.
Which two actions would solve this problem? (Choose two.)

A. Connect the security cameras to the lowest port numbers on the switch.
B. Set the power priority to high on ports connected to security cameras.
C. Set the power priority to low on ports connected to security cameras.
D. Set the maximum power settings on ports connected to security cameras.

Answer: A,B

NEW QUESTION # 60
Which protocol is used to dynamically create and prune VLANs?

A. IGMP
B. MVRP
C. DVMRP
D. DHCP

Answer: B

NEW QUESTION # 61
Which two BGP communities are pre-defined well-known communities? (Choose two.)

A. no-export
B. no-advertise
C. public
D. private

Answer: A,B

NEW QUESTION # 62
......

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