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| Section | Objectives |
|---|---|
| Layer 3 Routing Protocols | - IS-IS
|
| Routing Policy and Traffic Engineering | - Path Control
|
| Layer 2 Switching Technologies | - Spanning Tree Protocols
|
| MPLS and Advanced Routing Concepts | - MPLS Fundamentals
|
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NEW QUESTION # 106
You are deploying a three-stage EVPN environment with VXLAN using EX and QFX Series switches. The leaf devices will perform the gateway services. Which two statements are correct in this scenario? (Choose two.)
Answer: B,D
Explanation:
In a three-stage EVPN-VXLAN fabric (Spine-Leaf architecture) where leaf devices perform the gateway services (Edge-Routed Bridging or ERB):
* VTEP Functionality (Option B): Leaf devices act as VXLAN Tunnel End Points (VTEPs). They are responsible for encapsulating Ethernet frames from locally connected hosts into VXLAN packets for transport across the IP fabric and de-encapsulating incoming VXLAN packets.
* Fabric Support (Option C): In a standard Juniper IP fabric design, both the leaf and spine devices are typically expected to support VXLAN and EVPN capabilities. While spines in an ERB design might only perform IP forwarding in the underlay, they often participate in the BGP control plane (as Route Reflectors) or provide the ability to transition to Centrally-Routed Bridging (CRB) where spines would act as gateways.
* Incorrect Options: Option A is incorrect because the entire fabric infrastructure must be "VXLAN aware" in terms of MTU settings and routing capability to support the overlay. Option D is incorrect because in an ERB design, the spine devices are high-speed transit nodes and do not terminate VXLAN tunnels; only the edge (leaf) devices act as VTEPs.
NEW QUESTION # 107
In Junos, which configuration statement is used to enable IGMP snooping on a switch?
Answer: C
NEW QUESTION # 108
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: C
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 # 109
Exhibit
You want to provide better performance for the video traffic that traverses your network The video traffic enters your network without any class-of-service markings According to Juniper Networks, which two classification methods are performed by the routers shown in the exhibit? (Choose two.)
Answer: B,C
Explanation:
The exhibit illustrates a standard end-to-end Class of Service (CoS) path consisting of an edge router (R1) and core/intermediate routers (R2 and R3).
Edge Classification (Option B): The scenario specifies that video traffic enters the network without any class- of-service markings. Because there are no DSCP or 802.1p bits to inspect, the ingress router (R1) cannot use simple Behavior Aggregate (BA) classification. Instead, it must use Multifield (MF) classification. MF classification allows the router to look deeper into the packet (Source/Destination IP, Protocol, Port numbers) to identify the video stream and assign it to a specific forwarding class. * Core Classification (Option D):
Once R1 has identified the traffic, it will typically apply a rewrite rule on its egress interface to mark the packets with a specific CoS value (like a DSCP code). Consequently, the downstream routers (R2 and R3) do not need to perform expensive deep-packet inspection again. They can use Behavior Aggregate (BA) classification, which simply looks at the markings in the packet header to determine the appropriate forwarding priority.
Option A and C: These are incorrect because BA classification is impossible on unmarked ingress traffic, and performing MF classification in the core is inefficient and not a recommended Juniper design practice for high-speed transit.
NEW QUESTION # 110
Your existing enterprise network uses OSPFv3 on Juniper devices. You need to extend the networking into a new building, and it needs to be in its own OSPF area. Your team is debating about making the area a stub Which two statements are correct in this scenario? (Choose two.)
Answer: A,C
Explanation:
OSPF stub areas are used to reduce the size of the Link-State Database (LSDB) in routers with limited resources by restricting the flooding of external routes.
* Virtual Links (Option C):According to OSPF standards (both v2 and v3),virtual links cannot pass through stub areas. A virtual link must transit a "transit area," which must be a standard (non-stub) area with a full routing table.
* Totally Stubby Areas (Option D):A stub area (which blocks Type 5 External LSAs) can be further restricted into atotally stubby area. In Junos OS, this is done by adding the no-summaries statement to the stub configuration. This blocks both Type 5 and Type 3 (Inter-area) LSAs, replacing them with a single default route.
* Incorrect Statements:Option Ais incorrect because standard stub areas cannot contain an ASBR; only Not-So-Stubby Areas (NSSA) allow for an ASBR.Option Bis incorrect because an area is either a Stub or an NSSA; they are mutually exclusive configurations for the same area.
NEW QUESTION # 111
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