JN0-650 Reliable Mock Test, JN0-650 Pass4sure

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Juniper JN0-650 Exam Syllabus Topics:

TopicDetails
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
  • 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 4
  • 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 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
  • 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 7
  • 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.

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Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q21-Q26):

NEW QUESTION # 21
Exhibit
You are asked to configure VLAN load balancing on your network using MSTP. Referring to the exhibit, which two statements are correct? (Choose two.)

Answer: A,B

Explanation:
The exhibit shows the MSTP configuration for two switches,switch1andswitch2. MSTP allows you to group multiple VLANs into a single Multiple Spanning Tree Instance (MSTI), enabling different root bridges and topologies for different sets of VLANs.
* Root Bridge Election (Option B):For any Spanning Tree instance, the switch with thelowest bridge priorityis elected as the root bridge.
* Formsti 2, switch1 has a priority of4k(4096), while switch2 has a priority of8k(8192).
* Since 4096 < 8192,switch1 is elected the root bridge for msti 2.
* Failover Behavior (Option D):Spanning Tree is designed for redundancy. If a primary root bridge fails, the remaining switches in the network re-elect a new root based on the next lowest priority.
* Ifswitch2goes down, switch1 becomes the only switch in the region.
* Regardless of its original priority (4k or 8k), switch1 will take over as theroot bridge for both msti 1 and msti 2because there are no other contenders with a better (lower) priority.
* Incorrect Statements:Option Ais incorrect because for msti 1, switch2 has the lower priority (4k vs.
8k), making switch2 the root bridge.Option Cis incorrect because it contradicts the fundamental high- availability nature of Spanning Tree.


NEW QUESTION # 22
You are implementing an EVPN-VXLAN edge-routed bridging design using Layer 3 gateway operations. In this scenario, which statement is correct?

Answer: A

Explanation:
In anEVPN-VXLAN Edge-Routed Bridging (ERB)architecture, also known as a collapsed fabric, the Layer
3 default gateway functionality is moved from the core/spine layer down to the edge (the leaf or distribution layer).
* Anycast Gateways:To support seamless host mobility and redundancy, multiple distribution/leaf switches are configured with thesame anycast IP addressandMAC addresson their IRB interfaces for a given VLAN. This allows a host to move between different switches without needing to update its default gateway configuration or ARP cache.
* Distributed Routing:Routing occurs locally at the edge (distribution layer). Traffic destined for a different subnet is routed by the first switch it hits (the ingress leaf), rather than being backhauled to a central core router.
* Symmetric vs. Asymmetric IRB:Junos OS 24.4 supports both models, but the ERB design typically utilizes symmetric routing for better scalability, where each leaf only needs to know the routes for its locally connected VNIs and uses a transit VNI for inter-subnet communication.
Option Ais incorrect because while unique IPscanbe used (Method 1 in some docs), the defining characteristic of an efficient ERB design is the use of shared Anycast IPs for the gateway.Option Cdescribes a Centrally-Routed Bridging (CRB) design, not ERB.


NEW QUESTION # 23
Exhibit

Your network receives the full Internet BGP routing table from two different ISPs. You want your local routers to use Provider A to forward all Internet traffic as long as Provider A is available.
Referring to the exhibit, which two actions would satisfy this requirement? (Choose two.)

Answer: A,C

Explanation:
In BGP path selection, theLocal Preferenceattribute is one of the most common ways to influence outbound traffic from an Autonomous System (AS). It is a well-known discretionary attribute that is propagated throughout the AS to tell internal routers which path is preferred for a specific destination.
* Priority Rule: In the BGP selection algorithm, ahigher local preferencevalue is always preferred over a lower one. The default value in Junos OS is100.
* Influencing Outbound Traffic (Option A): To ensure that Provider A is always preferred, you would apply an import policy onR1(the router connected to Provider A) to set the local preference of all received routes to a value higher than the default (e.g., 200). Since 200 > 100, R3 and R4 will prefer the path via R1.
* Alternative Method (Option C): Conversely, you can achieve the same result by applying an import policy onR2(the router connected to Provider B) to set the local preference to a value lower than the default (e.g., 50). Since the routes from R1 remain at the default of 100, and 100 > 50, the path via R1 (Provider A) is preferred.
* Why B and D are incorrect: Setting a higher local preference on R2 (Option B) would make Provider B the preferred exit point. Setting a lower local preference on R1 (Option D) would make Provider A the leastpreferred exit point.


NEW QUESTION # 24
You enable the Multiple VLAN Registration Protocol (MVRP) to automate the creation and management of virtual LANs.
Which statement is correct in this scenario?

Answer: A


NEW QUESTION # 25
Your router is discarding an EBGP route because the next hop is not directly connected. Which BGP configuration would you use to override this behavior?

Answer: C

Explanation:
In External BGP (EBGP), there is a default safety mechanism that requires the peer's next hop to be on a directly connected network.
TTL Constraint: By default, EBGP packets are sent with a Time-to-Live (TTL) value of 1. If the next hop is not directly connected (e.g., when peering via loopback interfaces or across a multi-hop path), the packet will expire before reaching the destination, causing the route to be discarded or the session to fail.
The Multihop Solution (Option B): To override this behavior, you must configure the multihop statement under the BGP neighbor or group hierarchy. This allows the BGP session to establish by increasing the TTL (typically to 64 or a user-defined value) and bypasses the "directly connected" check.
Incorrect Options: Option A (accept-remote-nexthop) is used in internal BGP or specific routing-instance scenarios to resolve next hops that aren't in the local routing table, but it doesn't solve the EBGP TTL/direct- connection requirement. Option C (advertise-inactive) allows BGP to advertise routes that are not the best path in the routing table, which is irrelevant to next-hop reachability. Option D (multipath) is used for load- sharing across multiple paths.


NEW QUESTION # 26
......

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