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Juniper JN0-364 Exam Syllabus Topics:

SectionObjectives
Service Provider Architecture & Junos Fundamentals- Service provider network design basics
  • 1. Core, edge, and access architecture
    • 2. Scalability considerations
      - Junos OS routing fundamentals
      • 1. Junos CLI and configuration hierarchy
        • 2. Routing table and forwarding concepts
          Troubleshooting and Operations- Performance and monitoring
          • 1. System logging and alarms
            • 2. Traffic analysis basics
              - Network troubleshooting methodology
              • 1. Protocol verification tools
                • 2. Junos operational commands
                  MPLS and Service Provider Technologies- VPN services
                  • 1. Layer 2 VPN overview
                    • 2. Layer 3 VPN concepts
                      - MPLS fundamentals
                      • 1. LDP operations
                        • 2. Label switching and forwarding
                          OSPF and IS-IS Routing Protocols- IS-IS operation in service provider networks
                          • 1. LSP and SPF calculation
                            • 2. Levels and routing hierarchy
                              - OSPF configuration and troubleshooting
                              • 1. Areas and LSAs
                                • 2. Adjacency and neighbor states
                                  BGP and Routing Policy- Routing policy control
                                  • 1. Import/export policies
                                    • 2. Route filtering and manipulation
                                      - BGP fundamentals
                                      • 1. Attributes and path selection
                                        • 2. eBGP and iBGP operations

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                                          Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) Sample Questions (Q147-Q152):

                                          NEW QUESTION # 147
                                          Click the Exhibit button.

                                          Referring to the exhibit, R1 and R2 are advertising the same prefix 203.0.113.0/24 to R3 and R4 over EBGP. R3 and R4 both advertise this prefix to R5.
                                          Which advertisement does R5 choose to install in its routing table?

                                          Answer: A

                                          Explanation:
                                          R3 and R4 both advertise the same prefix into iBGP toward R5, but they assign different local preference values. R3 sets a local preference of 150, while R4 sets a local preference of 200.
                                          Since BGP selects routes with the highest local preference before considering other attributes, R5 chooses the route received from R4 and installs it in its routing table.


                                          NEW QUESTION # 148
                                          Which IPv6 extension header is used to specify intermediate nodes for a packet's path?

                                          Answer: C

                                          Explanation:
                                          In the IPv6 architecture, the base header is kept at a fixed size of 40 bytes to streamline processing. Any additional features or options are handled byExtension Headers, which are inserted between the IPv6 header and the upper-layer protocol. According to Juniper Networks technical documentation and RFC 8200, when a source node needs to list one or more intermediate nodes to be "visited" on the way to the final destination, it utilizes theRouting extension header (Option B).
                                          The Routing header is functionally similar to the "Source Route" option in IPv4. When a packet contains a Routing header, it is addressed to the first intermediate node listed in the header. That node examines the header, swaps its own address with the next address in the list, and forwards the packet. This process continues until the packet reaches the final destination. This is a foundational component for technologies like Segment Routing over IPv6 (SRv6), where the Routing header (specifically the Segment Routing Header or SRH) is used to steer traffic through a specific set of service instructions or nodes.
                                          To distinguish this from the other options:
                                          * Hop-by-hop options (Option A):These carry information that must be examined byeverynode along the path (such as Router Alert), not just specific intermediate nodes.
                                          * Fragment (Option C):This is used only when the source node needs to fragment a packet that exceeds the path MTU.
                                          * Destination options (Option D):These carry optional information intended specifically for the destination node (or nodes listed in a Routing header), but they do not dictate the path themselves.


                                          NEW QUESTION # 149
                                          Which IS-IS packet type will establish and maintain neighbor relationships?

                                          Answer: A

                                          Explanation:
                                          IS-IS establishes and maintains neighbor relationships using Hello PDUs, also called IIH (IS-IS Hello) packets. These packets are exchanged between routers to discover neighbors, form adjacencies, and periodically verify that the neighbor relationship is still active.


                                          NEW QUESTION # 150
                                          You have configured an MPLS LSP that begins on R1 and terminates on R5 using the Junos default settings.
                                          Referring to the exhibit, which router will perform only label swap operations?

                                          Answer: C

                                          Explanation:
                                          In an MPLS network, routers are categorized by their role along a Label Switched Path (LSP). In this scenario, the LSP originates onR1 (Ingress LER)and terminates onR5 (Egress LER). Between these two endpoints are the Provider (P) routers, also known as Transit Label Switching Routers (LSRs), which include R2, R3, and R4.
                                          To identify which router performsonlylabel swap operations, we must look at the standard Junos data plane behavior:
                                          * R1 (Ingress LER):Performs aPushoperation. It receives native IP traffic from Networks 1 or 2, looks up the destination, and imposes (pushes) an MPLS label onto the packet before sending it to R2.
                                          * R2 and R3 (Transit LSRs):These routers perform aSwapoperation. They receive a labeled packet, look up the incoming label in their Label Forwarding Information Base (LFIB), replace it with an outgoing label provided by the downstream neighbor, and forward it.
                                          * R4 (Penultimate Hop):By default, Junos usesPenultimate Hop Popping (PHP). Because R4 is the second-to-last router before the egress (R5), the egress router R5 advertises an "implicit-null" label (Label 3) to R4. This instructs R4 to perform aPopoperation-removing the MPLS label entirely-and sending the native IP packet to R5.
                                          * R5 (Egress LER):Receives the packet (which is already unlabeled due to PHP) and performs a standard IP route lookup to reach the final destination in Network 3 or 4.
                                          Among the options provided,R3is the only router that is a transit LSR butnotthe penultimate hop. While R2 also performs a swap, it is not an option. R4 performs a Pop (due to PHP), R1 performs a Push, and R5 performs an IP lookup. Therefore, R3 is the correct answer as it solely performs the label swap operation.


                                          NEW QUESTION # 151
                                          Click the Exhibit button.

                                          Referring to the exhibit, which two statements are true? (Choose two.)

                                          Answer: C,D

                                          Explanation:
                                          The routing table shows two equal-cost next hops for the prefix and both are installed in the forwarding table, which means the router is selecting both next hops for forwarding traffic. This indicates equal-cost multipath forwarding.
                                          The forwarding table entry shows a load-balancing group containing both next hops, which reflects the default Junos behavior of performing load balancing across equal-cost paths when multiple next hops exist for the same route.


                                          NEW QUESTION # 152
                                          ......

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