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Juniper JN0-650 Exam Syllabus Topics:

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

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                                      Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT) Sample Questions (Q119-Q124):

                                      NEW QUESTION # 119
                                      Exhibit

                                      Referring to the exhibit. R2 receives a packet from the multicast source on its ge-0/0/4 0 interface.
                                      Which two statements are correct in this scenario? (Choose two.)

                                      Answer: B,D

                                      Explanation:
                                      The exhibit illustrates a PIM multicast environment where router R2 has received a multicast packet from Source 1 (192.168.100.10) on its ge-0/0/4.0 interface. To prevent loops, PIM-SM uses a mechanism called Reverse Path Forwarding (RPF).
                                      RPF Check Process (Option A): When a multicast packet arrives, the router performs an RPF check by looking up the source ' s IP address in its unicast routing table (typically inet.0).
                                      The exhibit ' s command output, show multicast rpf 192.168.100.10, explicitly shows that for the source network $192.168.100.0/24$, the RPF interface is ge-0/0/1.0.
                                      Because the packet actually arrived on ge-0/0/4.0 instead of the expected ge-0/0/1.0 interface, the RPF check fails.
                                      Packet Discard (Option C): According to standard PIM-SM operation in Junos OS 24.4, if a multicast packet fails the RPF check-meaning it arrived on an interface that the router does not use to reach the source via unicast-the packet is discarded. This is a fundamental loop-prevention mechanism that ensures multicast traffic is only accepted from the shortest path toward the source.
                                      Option B is incorrect because the router will not add any interfaces to the Outgoing Interface List (OIL) for a packet that fails the initial RPF check.
                                      Option D is incorrect because the exhibit clearly shows the interface in the RPF table (ge-0/0/1.0) is different from the interface where the packet was received (ge-0/0/4.0).


                                      NEW QUESTION # 120
                                      In multicast networking, what is IGMP used for?

                                      Answer: C


                                      NEW QUESTION # 121
                                      Exhibit


                                      You are asked to configure VLAN load balancing on your network using MSTP. Referring to the exhibit, which two statements are correct? (Choose two.)

                                      Answer: B,C

                                      Explanation:
                                      The exhibit shows the MSTP configuration for two switches, switch1 and switch2. MSTP allows you to group multiple VLANs into a single Multiple Spanning Tree Instance (MSTI), enabling different root bridges and topologies for different sets of VLANs.
                                      Root Bridge Election (Option B): For any Spanning Tree instance, the switch with the lowest bridge priority is elected as the root bridge.
                                      For msti 2, switch1 has a priority of 4k (4096), while switch2 has a priority of 8k (8192).
                                      Since 4096 < 8192, switch1 is elected the root bridge for msti 2.
                                      Failover Behavior (Option D): Spanning Tree is designed for redundancy. If a primary root bridge fails, the remaining switches in the network re-elect a new root based on the next lowest priority.
                                      If switch2 goes down, switch1 becomes the only switch in the region.
                                      Regardless of its original priority (4k or 8k), switch1 will take over as the root bridge for both msti 1 and msti
                                      2 because there are no other contenders with a better (lower) priority.
                                      Incorrect Statements: Option A is incorrect because for msti 1, switch2 has the lower priority (4k vs. 8k), making switch2 the root bridge. Option C is incorrect because it contradicts the fundamental high-availability nature of Spanning Tree.


                                      NEW QUESTION # 122
                                      In OSPF, which LSA types are commonly included in a router's link-state database in a standard (non-NSSA) area? (Choose two)

                                      Answer: A,D


                                      NEW QUESTION # 123
                                      You configured MVRP in your Layer 2 network and you are adding two new interfaces to your distribution switch. You are asked to ensure that if a rogue device that uses MVRP is connected to these interfaces, that the MVRP PDUs are ignored In this scenario, what should you configure to accomplish this task?

                                      Answer: A

                                      Explanation:
                                      To secure a Layer 2 network runningMultiple VLAN Registration Protocol (MVRP)against unauthorized VLAN propagation from rogue devices, you must control the registration state of the ports.
                                      * Forbidden Registration Mode (Option D):This mode is specifically designed to prevent an interface from participating in the MVRP exchange.
                                      * When a port is set to forbidden, it willneither register nor declare VLANs(except those statically configured on the interface).
                                      * If a rogue device sends MVRP PDUs to this interface, the distribution switch willignore those PDUs, preventing the rogue device from dynamically creating or learning VLANs through that port.
                                      * Registration Hierarchy:In Junos OS 24.4, this is configured at the [edit protocols mvrp interface
                                      <interface-name> registration forbidden] level.
                                      * Other Modes:normal (default) allows full participation, while restricted ignores joins for VLANs not already statically defined on the switch but still declares its own.


                                      NEW QUESTION # 124
                                      ......

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