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Juniper JN0-650 Exam Syllabus Topics:

Topic
Details

Topic 1

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 2

IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
LLDP-MED protocols, and voice VLAN implementation.

Topic 3

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 4

Layer 2 Authentication and Access Control: This domain examines network access control mechanisms including 802.1x, MAC RADIUS, captive portal, server fail fallback, guest VLANs, and multi-method authentication considerations.

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

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.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q51-Q56):

NEW QUESTION # 51
You are deploying a three-stage EVPN environment with VXLAN using EX and QFX Series switches. The leaf devices will perform the gateway services. Which two statements are correct in this scenario? (Choose two.)

A. The spine devices will function as VTEPs.
B. Only the leaf devices must support VXLAN capabilities.
C. The leaf devices will function as VTEPs
D. Both the leaf and spine devices must support VXLAN capabilities.

Answer: C,D

Explanation:
In a three-stage EVPN-VXLAN fabric (Spine-Leaf architecture) where leaf devices perform the gateway services (Edge-Routed Bridging or ERB):
* VTEP Functionality (Option B):Leaf devices act asVXLAN Tunnel End Points (VTEPs). They are responsible for encapsulating Ethernet frames from locally connected hosts into VXLAN packets for transport across the IP fabric and de-encapsulating incoming VXLAN packets.
* Fabric Support (Option C):In a standard Juniper IP fabric design, both theleaf and spine devicesare typically expected to support VXLAN and EVPN capabilities. While spines in an ERB design might only perform IP forwarding in the underlay, they often participate in the BGP control plane (as Route Reflectors) or provide the ability to transition to Centrally-Routed Bridging (CRB) where spines would act as gateways.
* Incorrect Options:Option Ais incorrect because the entire fabric infrastructure must be "VXLAN aware" in terms of MTU settings and routing capability to support the overlay.Option Dis incorrect because in an ERB design, the spine devices are high-speed transit nodes and do not terminate VXLAN tunnels; only the edge (leaf) devices act as VTEPs.

NEW QUESTION # 52
Which statement is true regarding MD5 authentication in OSPF?

A. Each device on the network requires a unique key ID.
B. Multiple keys can be configured with different start times.
C. Each interface on a device requires a unique key ID.
D. The MD5 password is not encrypted on the wire.

Answer: B

NEW QUESTION # 53
Which two statements are correct about multicast routing tables? (Choose two.)

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

Answer: C,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 # 54
Exhibit.

Referring to the exhibit. Ieaf2 is elected the designated forwarder
Which two statements are correct if server2 generates a broadcast frame*? (Choose two.)

A. The broadcast frame will not be forwarded to leaf1.
B. Only leaf1 will forward the broadcast frame to server1.
C. Only Ieaf2 will forward the broadcast frame to server1
D. The broadcast frame will be forwarded to leaf1 and Ieaf2.

Answer: C,D

Explanation:
The exhibit illustrates anEVPN-VXLANfabric using multi-homing. Server1 is dual-homed to Leaf1 and Leaf2 using anEthernet Segment Identifier (ESI)in an active-active or active-standby configuration. Server2 is single-homed to Leaf3.
In EVPN environments, specific mechanisms are used to prevent loops and duplicate traffic when dealing with Broadcast, Unknown Unicast, and Multicast (BUM) traffic:
* Broadcast Propagation (Option A):When Server2 (connected to Leaf3) generates a broadcast frame, Leaf3 encapsulates this traffic into a VXLAN tunnel and forwards it to all other VTEPs (Virtual Tunnel End Points) that participate in that specific Virtual Network Instance (VNI). Therefore, both Leaf1 and Leaf2 will receive the broadcast frame from the core fabric.
* Designated Forwarder (DF) Election (Option C):To prevent a multi-homed device (like Server1) from receiving duplicate copies of the same broadcast frame from multiple leaf switches, EVPN utilizes aDesignated Forwarder (DF). For a given ESI, only one leaf switch is elected as the DF.
* The exhibit explicitly states thatLeaf2 is the Designated Forwarder.
* According to the Junos EVPN implementation, only the DF is responsible for decapsulating BUM traffic received from the core and forwarding it to the local access segment.
* While Leaf1 receives the frame (Option A), it will see that it is not the DF for that segment and will drop the frame rather than forwarding it to Server1. This ensures Server1 receives exactly one copy of the broadcast, delivered by Leaf2.
* Option B is incorrectbecause in a standard ingress replication or multicast-based underlay, all VTEPs in the VNI receive the broadcast.
* Option D is incorrectbecause Leaf1 is the non-designated forwarder (non-DF) for this segment and is prohibited from forwarding BUM traffic to the ESI.

NEW QUESTION # 55
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 higher 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 local preference on routes learned from ISP2 to be higher than those learned from ISP1.
D. Create and apply an import policy to set the route preference on routes learned from ISP2 to be lower than those learned from ISP1.

Answer: C

NEW QUESTION # 56
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