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Juniper JN0-650 Exam Syllabus Topics:

SectionObjectives
Layer 3 Routing Protocols- OSPF
  • 1. OSPF adjacency and troubleshooting
    • 2. Area design and LSDB operation
      - IS-IS
      • 1. Adjacency and metric behavior
        • 2. Level 1 / Level 2 routing
          - BGP
          • 1. Route selection and policy control
            • 2. eBGP and iBGP design
              MPLS and Advanced Routing Concepts- Advanced Services
              • 1. Service routing considerations
                • 2. VPN concepts overview
                  - MPLS Fundamentals
                  • 1. Label switching behavior
                    • 2. LDP operations
                      Layer 2 Switching Technologies- Spanning Tree Protocols
                      • 1. RSTP operation and convergence
                        • 2. MSTP concepts and deployment
                          - VLANs and Trunking
                          • 1. 802.1Q tagging and VLAN design
                            • 2. Inter-switch connectivity and trunk configuration
                              Routing Policy and Traffic Engineering- Policy Framework
                              • 1. Import/export policies
                                • 2. Route filtering and manipulation
                                  - Path Control
                                  • 1. Traffic engineering principles
                                    • 2. Load balancing strategies

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                                      Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q57-Q62):

                                      NEW QUESTION # 57
                                      In the context of IP multicast, what is a 'shared tree'?

                                      Answer: C


                                      NEW QUESTION # 58
                                      Referring to the exhibit, you are receiving multiple routes from ISP3 through two EBGP neighbors. You must ensure that all traffic leaving R1 destined to the networks advertised by ISP3 go Through ISP2.

                                      What should you do on R1 to accomplish this task?

                                      Answer: B


                                      NEW QUESTION # 59
                                      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: D

                                      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 # 60
                                      Referring to the exhibit, which two statements are correct? (Choose two.)

                                      Answer: B,C

                                      Explanation:
                                      DS-1 port status - DESG / FWD - VLAN 10 - ROOT Bridge
                                      DS-1 port status BLK/ALT - VLAN 20


                                      NEW QUESTION # 61
                                      Click the Exhibit button.

                                      You are troubleshooting suboptimal routing in an enterprise OSPFv2 deployment:
                                      -- R1 is an ABR between Area 0 and Area 1.
                                      -- R2 is an ABR between Area 0 and Area 2.
                                      -- R3 in Area 1 advertises a network that should be reachable by routers in Area 2.
                                      -- The ABRs are connected in the backbone (Area 0).
                                      On router R2, the show ospf database does not display router LSAs or network LSAs from Area 1, but an interarea route to R3's network exists in the routing table. R2 does not have Type-1 or Type-2 LSAs from Area 1 in its OSPF database.
                                      Referring to the exhibit, which statement is correct?

                                      Answer: C

                                      Explanation:
                                      The behavior described is the fundamental operational principle of OSPF ' s hierarchical area structure.
                                      * LSA Flooding Scope: In OSPFv2, Type-1 (Router) and Type-2 (Network) Link-State Advertisements (LSAs) are restricted to a local area flooding scope . They contain detailed topology information (such as which routers are connected to which links) that is only relevant for calculating the Shortest Path First (SPF) tree within that specific area.
                                      * ABR Functionality: Area Border Routers (ABRs), such as R1 in this scenario, act as the gateway between areas. The ABR does not forward Type-1 or Type-2 LSAs from one area to another. Instead, it extracts the prefix information (the network address and mask) from those LSAs and generates a Type-
                                      3 (Summary) LSA .
                                      * Interarea Reachability: This Type-3 LSA is then flooded into the backbone (Area 0) and subsequently into other non-backbone areas, such as Area 2. This explains why R2 sees an " interarea route " to R3's network in its routing table and has the corresponding Type-3 LSA in its database, but cannot see the original Type-1 or Type-2 LSAs from Area 1.
                                      * Why other options are incorrect: Option A is incorrect because this is standard protocol behavior, not the result of a manual filter. Option B is incorrect as there is no such " disable " feature; the protocol design inherently prevents these LSAs from crossing boundaries. Option C is incorrect because OSPFv3 still uses Type-1 and Type-2 LSAs (renamed but functionally similar for topology), and the prompt specifically identifies the deployment as OSPFv2 .


                                      NEW QUESTION # 62
                                      ......

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