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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 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
  • 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
  • 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 (Q70-Q75):

NEW QUESTION # 70
You are deploying an 802.1X solution and must determine what would happen if clients are unable to re-authenticate to the RADIUS server. In this scenario, which configuration would provide access to the network if the supplicant is already authenticated?

Answer: B

Explanation:
Permit authentication, allowing traffic to flow from the end device through the interface as if the end device were successfully authenticated by the RADIUS server.
Deny authentication, preventing traffic from flowing from the end device through the interface.
This is the default.
Move the end device to a specified VLAN. (The VLAN must already exist on the router.) Sustain authenticated end devices that already have LAN access and deny unauthenticated end devices. If the RADIUS servers time out during reauthentication, previously authenticated end devices are reauthenticated and new users are denied LAN access.


NEW QUESTION # 71
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?

Answer: C

Explanation:
This question focuses on port security and preventing "rogue switches" or multiple devices from accessing a single physical port simultaneously.
* Single-Secure Supplicant Mode (Option A):This is the most restrictive 802.1X mode in Junos OS. It allowsexactly oneMAC address to be authenticated on the port at a time. If a device successfully authenticates, the switch will drop any traffic coming from any other MAC address on that same physical interface. If a user tries to plug in a switch, only the first device that authenticates will have access; all other devices behind that switch will be blocked.
* Single Supplicant Mode (Option C):This mode allows the first authenticated user to "open" the port for all other users. This would actuallyallowa rogue switch to function once the first device is authorized.
* Multiple Supplicant Mode (Option B):This allows multiple devices to connect, provided each one authenticates individually. While secure, it does not prevent a user from connecting multiple devices to the port, which violates the requirement to allow only one.
* MAC-RADIUS (Option D):This is an authenticationmethod, not a port-accessmodethat limits the number of supplicants.


NEW QUESTION # 72
When configuring OSPF. what is the purpose of adding the secondary command to an OSPF interface?

Answer: A

Explanation:
In Junos OS, a physical or logical interface is typically associated with a single OSPF area. However, there are specific design requirements-such as migrating an interface from one area to another without downtime or creating specific transit topologies-where an interface needs to exist in two areas simultaneously.
* Multi-area Adjacency (Option B):The secondary command under the OSPF interface hierarchy allows an interface to be part of asecondary areain addition to its primary area.
* Protocol Behavior:When an interface is configured as secondary, the router sends and receives OSPF Hello packets for both the primary and secondary areas on that single link. This allows the router to form adjacencies with neighbors in both areas over the same physical connection.
* Use Case:This is frequently used in hub-and-spoke topologies or during network restructuring to ensure reachability is maintained while changing area boundaries. It effectively allows a "logical" split of the interface at the OSPF protocol level.


NEW QUESTION # 73
Which PIM mode is designed to support one-to-many communications with the least amount of state information in the network?

Answer: D


NEW QUESTION # 74
You are deploying IP phones in your enterprise network that must receive their power through their Ethernet connection. You are using your EX Series switch's PoE ports that support IEEE 802.3af.
In this scenario, what is the maximum amount of power allocated to each interface?

Answer: A


NEW QUESTION # 75
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