JN0-364試験 & JN0-364合格資料

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Juniper JN0-364 Exam Syllabus Topics:

SectionObjectives
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
          Troubleshooting and Operations- Network troubleshooting methodology
          • 1. Junos operational commands
            • 2. Protocol verification tools
              - Performance and monitoring
              • 1. System logging and alarms
                • 2. Traffic analysis basics
                  MPLS and Service Provider Technologies- MPLS fundamentals
                  • 1. Label switching and forwarding
                    • 2. LDP operations
                      - VPN services
                      • 1. Layer 3 VPN concepts
                        • 2. Layer 2 VPN overview
                          Service Provider Architecture & Junos Fundamentals- Junos OS routing fundamentals
                          • 1. Routing table and forwarding concepts
                            • 2. Junos CLI and configuration hierarchy
                              - Service provider network design basics
                              • 1. Core, edge, and access architecture
                                • 2. Scalability considerations
                                  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

                                          >> JN0-364試験 <<

                                          Juniper JN0-364合格資料 & JN0-364独学書籍

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                                          Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) 認定 JN0-364 試験問題 (Q59-Q64):

                                          質問 # 59
                                          You are configuring BGP on a Juniper router to peer with an external provider. After committing the configuration, the BGP session remains in the Idle state. Which configuration issue would prevent the BGP session from progressing beyond the Idle state?

                                          正解：C

                                          解説：
                                          In the BGP finite state machine, theIdlestate is the "stop" or "start" point of the protocol. When a session is stuck in Idle, it means the BGP process is either administratively disabled or, more commonly, is unable to initiate the underlying TCP connection required for BGP.
                                          According to Juniper Networks Service Provider documentation, the most common reason for a BGP session to remain in Idle is a lack ofrouting reachability. For BGP to move to theConnectstate, the Junos kernel must have a route to the IP address specified in the neighbor statement. If thepeer IP address is unreachable (Option A)-meaning there is no route in inet.0 (via OSPF, IS-IS, or static)-the router cannot initiate the TCP three-way handshake on port 179. Consequently, the state machine will never progress.
                                          Analysis of incorrect options:
                                          * Option B:BGP does not care if the local AS is higher or lower than the peer's; it only cares if they match the configuration. AS numbers are identifiers, not priorities.
                                          * Option C:A mismatchedRouter IDdoes not prevent a session from leaving the Idle state. It would typically cause the session to reach theOpenConfirmstate, and then fail with a "Notification" message due to a collision or identification error.
                                          * Option D:While a mismatchedgroup type(internal vs. external) will cause the session to fail, it usually fails during theOpenmessage exchange (OpenSent state) because the AS numbers provided will not match the expected peer type (IBGP vs. EBGP).
                                          Only the lack of a path to the neighbor (reachability) keeps the session at the very beginning of the process:
                                          theIdlestate.


                                          質問 # 60
                                          What information is determined by using the AS path attribute included in the BGP update message? (Choose two.)

                                          正解：A、D


                                          質問 # 61
                                          You are bringing a new network online with three IS-IS routers using default Junos election priorities. The routers are configured as Level 2 only IS-IS routers. Which statement is true about the DIS election in this scenario?

                                          正解：A

                                          解説：
                                          A router's priority for becoming the designated router is indicated by an arbitrary number from 0 through 127, which you configure on the IS-IS interface. The router with the highest priority becomes the designated router for the area (Level 1, Level 2, or both), also configured on the IS- IS interface. If routers in the network have the same priority, then the router with the highest MAC address is elected as the designated router. By default, routers have a priority value of 64.


                                          質問 # 62

                                          In the exhibit, Site A is sending traffic to Site B. R1 adds MPLS label 7166 to direct the traffic to R5. Which two criteria did R1 use to determine which label number to add to the traffic? (Choose two.)

                                          正解：B、D

                                          解説：
                                          In a Juniper Networks MPLS environment, the process by which a router determines how to forward traffic involves both the control plane and the data plane. When R1 (acting as an Ingress Label Edge Router, or LER) receives an IP packet from Site A destined for Site B, it must perform a lookup to decide whether to forward the packet via standard IP routing or via an MPLS Label Switched Path (LSP).
                                          The first criterion R1 uses is thedestination address of the traffic(Option C). Upon receiving the native IP packet, R1 looks up the destination IP in its routing table (typically inet.0). If the destination matches a prefix that is associated with an LSP-such as the loopback address of R5 or a prefix reachable via R5-the router identifies the appropriate Forwarding Equivalence Class (FEC). The FEC essentially groups packets that should be forwarded in the same manner over the same path. Without identifying the destination, the router cannot map the traffic to the correct MPLS tunnel.
                                          The second criterion is thelabel number advertisement received from R2(Option D). MPLS relies on downstream label allocation. In this topology, R2 is the immediate downstream "next hop" for R1 on the path to Site B. For the LSP to be established, R2 must signal a label to R1 using a protocol like LDP (Label Distribution Protocol) or RSVP (Resource Reservation Protocol). This label (in this case, 7166) tells R1: "If you want to send traffic to the destination associated with this LSP, wrap it in this specific label so I know how to process it." R1 does not use the source address (Option A) for standard label mapping, nor does it receive the label directly from R5 (Option B) in a hop-by-hop signaling model; it must use the label provided by its direct neighbor, R2. Therefore, by combining the destination IP (to find the path) and the label provided by the next hop (to encapsulate the packet), R1 successfully directs the traffic through the MPLS core.


                                          質問 # 63
                                          The segment touting SRGB start label Is 10,000 and the SRGB index range is 500. In this scenario, which two statements are correct? (Choose two.)

                                          正解：B、C

                                          解説：
                                          The Segment Routing Global Block (SRGB) defines a range of MPLS labels reserved for segment routing. With an SRGB starting label of 10,000 and an index range of 500, the first usable label is indeed 10,001 because label 10,000 is typically reserved and not used for forwarding. The last usable label would be 10,499 because the range includes 500 labels starting from 10,001.


                                          質問 # 64
                                          ......

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