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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	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 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	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	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	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 7	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 (Q115-Q120):

NEW QUESTION # 115
Which two options are available when a MAC limit is reached? (Choose two.)

A. The port can be shut down.
B. The port can be re-assigned to a different VLAN.
C. The port can be set to blocking mode.
D. The port can be administratively disabled.

Answer: A,C

NEW QUESTION # 116
Your organization uses 802 1X with a RADIUS server. If the RADIUS server stops responding, you want the fallback action to continue to permit access for devices that currently have authorization but deny any new access attempts.
Which fallback action provides this capability?

A. use-cache
B. permit
C. deny
D. vlan-name

Answer: A

Explanation:
Junos OS 24.4 provides several server-failover options for 802.1X authentication to maintain network availability when the RADIUS server is unreachable.
* Fallback Behavior (Option D):Theuse-cachefallback action allows the switch to consult its local cache of previously authenticated MAC addresses.
* If a device was already authorized and its information is in the cache, the switch willcontinue to permit accessbased on those cached credentials.
* However, if a new device (not in the cache) attempts to connect while the server is down, the switch cannot verify its credentials and willdeny the access attempt. This matches the specific requirement to permit authorized devices while denying new ones.
* Other Fallback Options:
* permit (Option C):This would allowalldevices (even new ones) to access the network, typically in a restricted "guest" or "bypass" VLAN.
* deny (Option A):This would drop all traffic from all devices on the port if the server is unreachable.
* vlan-name (Option B):This moves authenticated or unauthenticated users into a specific fallback VLAN.

NEW QUESTION # 117
Which two statements are correct about EVPN/VXLAN deployments? (Choose two.)

A. VNIs are used to identify broadcast domains within an EVPN/VXLAN environment.
B. VTEPs are used to identify broadcast domains within an EVPN/VXLAN environment.
C. VNIs are used for encapsulating and de-encapsulating traffic entering and leaving the tunnels
D. VTEPs are used for encapsulating and de-encapsulating traffic entering and leaving the tunnels.

Answer: A,D

Explanation:
In an EVPN-VXLAN architecture, the interaction between the control plane (EVPN) and the data plane (VXLAN) is defined by specific functional components:
VTEP (VXLAN Tunnel End Point): These are the entities responsible for the encapsulation and de- encapsulation of Layer 2 Ethernet frames into Layer 3 UDP/IP packets. A VTEP can be a physical switch (like a QFX or EX series) or a software-based entity. When traffic enters the fabric, the ingress VTEP wraps it in a VXLAN header; the egress VTEP removes this header before delivering it to the destination host. (Option B) VNI (Virtual Network Identifier): The VNI is a 24-bit field in the VXLAN header that allows for up to 16 million unique identifiers. It is used to identify specific broadcast domains (or VLANs) within the overlay network. Each VNI effectively represents a virtualized Layer 2 segment that is stretched across the Layer 3 underlay. (Option D) Incorrect statements: Option A is incorrect because VNIs are identifiers, not the " engine " that performs encapsulation-that is the VTEP ' s job. Option C is incorrect because VTEPs identify the endpoints of a tunnel, not the individual broadcast domains themselves.

NEW QUESTION # 118
Which statement accurately describes the 'next-hop resolution' in BGP?

A. It refers to changing the next-hop attribute to the local router's address.
B. It includes recalculating the best path when the next-hop changes.
C. It involves selecting the next-hop with the highest IP address.
D. It is the process of determining the validity of the next-hop attribute.

Answer: D

NEW QUESTION # 119
You have configured DSCP CoS in your network and have applied BA and multifield classifiers to all interfaces. In this scenario, which statement is correct?

A. If traffic matches both classifiers, then the BA classifier determines into which forwarding class the traffic is assigned.
B. You must set the BA classifier to take precedence over the multifield classifier or the configuration is ignored.
C. You must set the multifield classifier to take precedence over the BA classifier or the configuration is ignored.
D. If traffic matches both classifiers, then the multifield classifier determines into which forwarding class the traffic is assigned.

Answer: D

Explanation:
In Junos CoS, if traffic matches both a multifield (MF) and a behavior-aggregate (BA) classifier, the MF classifier takes precedence and determines the forwarding class. BA classifiers only apply when MF does not classify the traffic.

NEW QUESTION # 120
......

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