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| Section | Objectives |
|---|---|
| MPLS and Advanced Routing Concepts | - Advanced Services
|
| Layer 2 Switching Technologies | - Spanning Tree Protocols
|
| Routing Policy and Traffic Engineering | - Path Control
|
| Layer 3 Routing Protocols | - BGP
|
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NEW QUESTION # 103
Which protocol is used to dynamically create and prune VLANs?
Answer: B
NEW QUESTION # 104
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?
Answer: B
Explanation:
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 instances depending on the software version (ELS vs. non-ELS). In your scenario, having 450 VLANs exceeds 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 to enable RSTP (Rapid Spanning Tree Protocol). Unlike VSTP, RSTP runs a single spanning tree instance for 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 C and Option D are parameter tuning actions that do not address the architectural limitation of the number of running instances.
NEW QUESTION # 105
Referring to the exhibit, ServerA sends a single IP packet destined to 10.0.0.127.
Which two statements correctly describe the behavior of the resulting outbound VXLAN packets that contain the original packet destined to 10.0.0.127? (Choose two.)
Answer: B,C
NEW QUESTION # 106
Which two statements are correct about multicast routing tables? (Choose two.)
Answer: C,D
Explanation:
Junos OS uses specific routing tables for handling multicast traffic to ensure loop prevention through Reverse Path Forwarding (RPF) checks:
* Multicast RPF (Option C): The inet.0 table is the default unicast routing table. In most standard multicast deployments, Protocol Independent Multicast (PIM) performs its RPF checks against this table to determine the upstream interface toward the multicast source.
* Topology Differences (Option A): The inet.2 table is specifically designed for multicast RPF lookups when the multicast forwarding topology differs from the unicast forwarding topology. This is common in environments using Multiprotocol BGP (MBGP) where you might want multicast traffic to follow a different path than standard data traffic.
* inet.1 Role (Option B): The inet.1 table is the multicast forwarding cache. It stores (S,G) and (*,G) entries for actual packet forwarding. Routing protocols like MBGP or IS-IS do not place routes directly into inet.1; instead, PIM uses information from inet.0 or inet.2 to populate inet.1.
* IS-IS and OSPFv3 (Option D): These protocols place their IPv4/IPv6 unicast routes into inet.0 or inet6.0. They do not place routes into inet.2 "directly" unless specific RIB-group configurations or address families are enabled to share those routes for multicast RPF purposes.
NEW QUESTION # 107
Exhibit:
Referring to the exhibit, the source is currently sending multicast traffic using group 224.1.1.1, which is being received by R1. R2 is not receiving PIM register messages. What would be the cause of this problem?
Answer: B
NEW QUESTION # 108
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