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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	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	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 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	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 6	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 7	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 (Q98-Q103):

NEW QUESTION # 98
In multicast networking, what is the role of Anycast RP?

A. To distribute multicast traffic evenly across all receivers
B. To provide a single IP address for multiple Rendezvous Points
C. To replace the need for IGMP in multicast routing
D. To encrypt multicast traffic between the sender and receiver

Answer: B

NEW QUESTION # 99
What causes IBGP route flapping in enterprise networks?

A. packet misordering due to out-of-band management
B. misconfigured BGP update intervals
C. excessive BGP community tagging
D. recursive routing failure in the underlying IGP

Answer: D

Explanation:
In enterprise networks utilizing Junos OS, IBGP (Internal BGP) route flapping is frequently caused by recursive routing failures within the underlying IGP (Interior Gateway Protocol) , such as OSPF or IS-IS.
* Recursive Next-Hop Resolution: Unlike EBGP, where the neighbor is typically directly connected, IBGP neighbors are often several hops away. Consequently, an IBGP route ' s protocol next-hop is usually a loopback IP address that requires a recursive lookup to resolve. The router must consult its unicast routing table (typically inet.0 or inet.3) to find a physical path to that next-hop.
* The Flapping Mechanism: A " flap " occurs when a route is repeatedly withdrawn and readvertised. If the IGP path used to resolve the BGP next-hop becomes unstable or if the BGP route itself is inadvertently used to resolve its own next-hop (a recursive loop), the BGP next-hop becomes unreachable.
* Impact on Routing Table: When the next-hop cannot be resolved, the BGP route is considered invalid and is withdrawn from the routing table. Once the route is withdrawn, the original IGP path to the next- hop often becomes valid again, causing the BGP route to be readvertised . This cycle of withdrawal and readvertisement creates the instability known as flapping.
* Why other options are incorrect: Packet misordering (Option A) and community tagging (Option B) may affect performance or policy but do not cause a route to be withdrawn and readvertised in this cyclical manner. While update intervals (Option C) control how quickly changes are sent, they are not the root cause of the reachability failure that triggers the flap itself.

NEW QUESTION # 100
You have configured DHCP snooping on a Juniper switch.
Which statement is true?

A. All access ports are untrusted by default.
B. All ports are trusted by default.
C. All ports are untrusted by default.
D. All access ports are trusted by default.

Answer: A

NEW QUESTION # 101
You are deploying IP phones in your enterprise networks. When plugged in, the IP phones must be automatically provided with the correct VLAN ID needed for sending voice traffic to the EX Series switches. In this scenario, which two solutions are required to accomplish this task?
(Choose two.)

A. Enable the voice VLAN feature with the appropriate access interfaces and VLAN ID for voice traffic.
B. Use LLDP on appropriate interfaces.
C. Enable LLDP-MED on appropriate access interfaces.
D. Create two VLANs and assign them as VLAN members to the appropriate access interfaces.

Answer: A,C

NEW QUESTION # 102
Your Layer 2 network uses 802.1X to authenticate user devices connecting to the network. You are asked to include a new Layer 2 interface connection from the conference room in your network. You must ensure that only a single device is allowed to authenticate on this port at one time to avoid users from being able to plug in a rogue switch to this port. In this scenario, which
802.1X method would you use for the new interface?

A. MAC-RADIUS
B. single supplicant mode
C. single-secure supplicant mode
D. multiple supplicant mode

Answer: C

Explanation:
Single-secure supplicant mode allows only one device to authenticate on the port at a time. This prevents a rogue device, such as a switch, from being connected behind the port, while still allowing legitimate users to authenticate via 802.1X.

NEW QUESTION # 103
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