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| Section | Weight | Objectives |
|---|---|---|
| IP Multicast | 15% | - ASM / SSM models, RPF mechanism - IGMP, PIM-SM, RP, Anycast RP, MSDP - Multicast routing policy & scoping |
| Access Control & IP Telephony | 5% | - PoE, LLDP-MED, voice VLAN - 802.1X, MAC RADIUS, captive portal |
| Interior Gateway Protocols (IGPs) | 20% | - Route preference, redistribution, summarization - IS-IS: operation, routing policy, route filtering - OSPFv2 / OSPFv3: design, configuration, troubleshooting |
| Advanced Ethernet Switching & Spanning Tree | 20% | - MSTP, VSTP, RSTP configuration & tuning - Filter-based VLANs, private VLANs, MVRP - Layer 2 tunneling: Q-in-Q, L2PT |
| EVPN & Data Center Interconnect | 10% | - EVPN route types, VXLAN encapsulation - Multi-homing, redundancy, integration |
| Class of Service (CoS) | 10% | - Classification, marking, forwarding classes - Rewrite rules, congestion management - Policers, schedulers, drop profiles, shaping |
| Border Gateway Protocol (BGP) | 20% | - Route selection, next-hop handling, attributes - Communities, extended communities, load balancing - IPv4/IPv6 address families, policy implementation |
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NEW QUESTION # 123
You must implement EVPN signaling on an EX Series device that is configured with both underlay and overlay networks. Which network protocol accomplishes this task?
Answer: C
Explanation:
In an EVPN-VXLAN architecture, the network is divided into two distinct planes: the Underlay and the Overlay.
Underlay (IP Fabric): The underlay ' s only job is to provide IP reachability between the loopback addresses of all VTEPs (Virtual Tunnel Endpoints). This is typically achieved using OSPF, IS-IS, or EBGP.
Overlay (EVPN Control Plane): The overlay is responsible for carrying Layer 2 MAC and Layer 3 IP reachability information between switches. EVPN signaling is the standard mechanism for this task.
Protocol Choice (Option D): EVPN uses MP-BGP (Multiprotocol BGP) as its control plane protocol. On Juniper EX Series and QFX Series switches, the most scalable and recommended design for the overlay is EBGP (External BGP).
In a 3-stage or 5-stage Clos architecture, EBGP is used in the overlay to exchange EVPN routes (Route Types
1-5) between Leaf and Spine switches.
EBGP simplifies configuration by avoiding the need for Route Reflectors (required for IBGP) and provides better control over route propagation through BGP community and policy management.
Incorrect Options:
Options A and B refer to the underlay protocols. While they provide the path for the VXLAN tunnels, they do not handle the EVPN signaling itself.
Option C (MPLS) is a different transport technology. While EVPN can run over MPLS (EVPN-MPLS), campus designs on EX series devices specifically use VXLAN as the data plane, making EBGP the standard signaling protocol for the EVPN-VXLAN overlay.
NEW QUESTION # 124
You have deployed sparse-mode multicast in your network using the IGP metrics shown in the exhibit.
Which path will (*,G) traffic follow from the source to the receiver before the (S,G) state is registered?
Answer: B
NEW QUESTION # 125
Exhibit
You need to configure the non-RP routers in your network to dynamically learn the location of the RP using standard protocols only. You have already applied the configuration shown in the exhibit, but the routers have not learned the location of the RP.
Which additional step must you take to fulfill these requirements?
Answer: C
Explanation:
The exhibit shows a multicast network running PIM Sparse Mode where R2 is configured as a local Rendezvous Point (RP). However, the non-RP routers (like R5) show no learned RP in their show pim rps output. To resolve this using standard protocols for dynamic RP discovery, you must implement a mechanism that automates the distribution of RP information across the PIM domain.
Bootstrap Router (BSR) (Option B): BSR is the industry-standard (RFC 5059) mechanism for dynamically electing an RP and distributing that information throughout a PIM-SM domain.
It uses two roles: Candidate-RPs (C-RPs), which announce their desire to be an RP, and Candidate-BSRs (C- BSRs), which collect these announcements and flood them to all other routers in the network via PIM bootstrap messages.
BSR is a " standard protocol " as it is part of the PIMv2 specification. Once configured on R2 (as C-RP) and potentially R1 or R2 (as C-BSR), all other routers will dynamically learn that R2 is the RP for the specified group ranges.
Auto-RP (Option D): While this also provides dynamic RP discovery, it is a proprietary Cisco protocol.
Although Junos supports it for interoperability, the question specifically asks for " standard protocols only, " making BSR the preferred choice.
MSDP (Option A): Multicast Source Discovery Protocol (MSDP) is used to share information about active sources between different PIM domains or for Anycast-RP. It does not handle the initial discovery of an RP within a single domain for standard PIM-SM operations.
Anycast RP (Option C): This is a technique used for RP redundancy and load balancing. While it can use BSR or MSDP for synchronization, it is a design architecture rather than a standalone " standard protocol " for the basic dynamic discovery of an RP in the manner requested here.
Configuration Example for BSR in Junos OS 24.4: To enable this, you would add the following to the RP (R2):
set protocols pim rp bootstrap-discovery
set protocols pim rp candidate-rp 10.222.1.2 group-ranges 224.0.0.0/4
set protocols pim rp candidate-bsr 10.222.1.2
NEW QUESTION # 126
In a multicast network, what is the purpose of IGMP Query messages?
Answer: C
NEW QUESTION # 127
Click the Exhibit button.
You need to configure the non-RP routers in your network to dynamically learn the location of the RP using standard protocols only. You have already applied the configuration shown in the exhibit, but the routers have not learned the location of the RP.
Which additional step must you take to fulfill these requirements?
Answer: C
Explanation:
To allow non-RP routers to dynamically learn the location of the RP using standard protocols, you must configure BSR (Bootstrap Router). BSR is a standardized method in PIM Sparse Mode that distributes RP information across the network without requiring manual configuration on each router.
NEW QUESTION # 128
......
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