新版JN0-650題庫：Enterprise Routing and Switching, Professional (JNCIP-ENT)100％通過考試｜JN0-650考古題介紹

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Juniper JN0-650 考試大綱：

主題簡介
主題 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.
主題 2
  • 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.
主題 3
  • IP Telephony Features: This section focuses on features supporting VoIP deployments including Power over Ethernet, LLDP
  • LLDP-MED protocols, and voice VLAN implementation.
主題 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.
主題 5
  • EVPN: This section addresses Ethernet VPN technology for Layer 2 over Layer 3 connectivity, covering EVPN route types, VXLAN encapsulation, and multi-homing configurations.
主題 6
  • 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.

>> 新版JN0-650題庫 <<

JN0-650考古題介紹 - JN0-650證照

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最新的 JNCIS-ENT JN0-650 免費考試真題 (Q114-Q119):

問題 #114
You have a P-VLAN that spans multiple switches. In this scenario, how do you enable communication across the P-VLAN?

答案：D

解題說明：
To enable communication across a P-VLAN (primary VLAN) that spans multiple switches, you must configure trunk ports with inter-switch links. This allows the P-VLAN traffic to traverse multiple switches while maintaining the separation between associated secondary VLANs.


問題 #115
You have two multicast receivers connected to the same VLAN. You notice that the switch that they are connected to is forwarding multicast traffic out of all the ports in the same VLAN, instead of just the two ports for the connected multicast receivers In this scenario, what would you configure to optimize multicast forwarding?

答案：A

解題說明：
In a standard Layer 2 switch environment without specific multicast optimizations, multicast traffic is treated similarly to broadcast traffic and isflooded out of all portswithin a VLAN (except the port where it was received). This is inefficient as it consumes unnecessary bandwidth on ports where no receivers are present.
To optimize this,IGMP Snoopingis the standard solution.
* How it works:The switch "snoops" or monitors IGMP (Internet Group Management Protocol) messages between hosts and routers.
* Result:When a receiver sends an IGMP Membership Report (Join) for a specific multicast group, the switch records which port that request came from. It then builds a Layer 2 multicast forwarding table so that traffic for that group isonly forwardedto the specific ports that have active listeners.
* Junos OS 24.4 Configuration:On modern Juniper switches, you enable this globally or per VLAN using the set protocols igmp-snooping vlan <vlan-name> command.
Option A (Promiscuous mode)is used for monitoring or specific security configurations (like Private VLANs) and would not limit multicast flooding.Option B (Spanning Tree)manages loop prevention and does not differentiate between traffic types for forwarding optimization.Option D (IRB interface)is used for Layer 3 routing between VLANs but does not inherently provide Layer 2 multicast optimization within a single VLAN.


問題 #116
You are asked to deploy 802.1X on your EX Series switches. You need to ensure authenticated devices continue to have access to the network even if the authentication server fails.
Which action meets this configuration objective?

答案：D


問題 #117
You run a multivendor switching environment where you have configured VSTP. You have 450 VLANs and notice that some of your VLANs do not function properly. How should you change the configuration to get all
450 VLANs working?

答案：C

解題說明：
VSTP (VLAN Spanning Tree Protocol) is Juniper's implementation that provides a separate spanning tree instance for each VLAN, ensuring compatibility with Cisco's PVST+. However, it has significant scaling limitations:
* Instance Limits:On many Juniper EX and QFX series switches, VSTP is restricted to a maximum of
253 or 510 VLAN instancesdepending on the software version (ELS vs. non-ELS). In your scenario, having450 VLANsexceeds the standard 253-instance limit found on many platforms.
* The Solution (Option B):When the number of VLANs exceeds the VSTP capacity, the recommended best practice is toenable RSTP(Rapid Spanning Tree Protocol). Unlike VSTP, RSTP runs asingle spanning tree instancefor the entire switch, regardless of how many VLANs are configured. This ensures that all 450 VLANs are protected from loops without hitting the hardware's instance-count limit.
* Other Options:Option A(force-version) only affects the BPDU format for compatibility but doesn't solve the instance limit.Option CandOption Dare parameter tuning actions that do not address the architectural limitation of the number of running instances.


問題 #118
The network you support currently has a mixture of MC-LAG and Virtual Chassis being used to provide redundant connectivity from various IDFs. A project to modernize the architecture and move to EVPN- VXLAN using ESI-LAG will be starting soon. You want to avoid IDFs losing connectivity as the core devices are migrated to EVPN-VXLAN. Which action will accomplish this task?

答案：C

解題說明：
In an EVPN-VXLAN environment using ESI-LAG (Ethernet Segment Identifier Link Aggregation) , the Core Isolation feature is a safety mechanism designed to prevent traffic blackholing. When a leaf switch (acting as a VTEP) loses its BGP peering or its link to the IP fabric core, it assumes it is " isolated " from the rest of the network. To protect the network, the switch automatically shuts down its local member links of any multi-homed ESI-LAG to force traffic to the peer switch that still has core connectivity.
However, during a migration or in specific transitional topologies where the core might be temporarily unreachable or not yet fully established, this feature can cause the leaf switches to shut down all downstream IDF (Intermediate Distribution Frame) connections, leading to a total loss of connectivity.
* The Solution (Option C): By enabling the no-core-isolation statement under the [edit protocols evpn] hierarchy, you instruct the switch to disable this automatic shutdown behavior . This ensures that even if the BGP session or core links are not yet stable during the migration process, the ESI-LAG interfaces remain Up , allowing the IDFs to maintain connectivity to their local default gateways or other local resources.
* Why others are incorrect: Enabling EVPN-VXLAN before migration (Option A) does not address the isolation logic. Removing MC-LAG/Virtual Chassis links prematurely (Option B) would cause an immediate outage. The network-isolation-profile (Option D) is typically used for different loop prevention scenarios and does not override the specific core-isolation check that affects multi-homed ESIs.


問題 #119
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