真実的-一番優秀なJN0-351出題内容試験-試験の準備方法JN0-351模擬資料

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Juniper JN0-351 Exam Syllabus Topics:

SectionObjectives
Topic 1: Layer 3 Routing Fundamentals- Routing protocols
  • 1. IS-IS basics
    • 2. OSPF fundamentals and operations
      • 3. BGP fundamentals
        - Routing concepts
        • 1. Route preference and policy
          • 2. Protocol-independent routing
            Topic 2: Layer 2 Security- Switch security features
            • 1. Storm control
              • 2. MAC limiting
                Topic 3: Tunneling Technologies- IP tunneling
                • 1. IP-IP tunnels
                  • 2. GRE tunnels
                    Topic 4: High Availability- Redundancy mechanisms
                    • 1. BFD
                      • 2. VRRP
                        - Junos HA features
                        • 1. GRES
                          • 2. NSR / NSB
                            • 3. Graceful restart
                              Topic 5: Layer 2 Switching- Spanning Tree Protocol (STP/RSTP)
                              • 1. Loop prevention mechanisms
                                • 2. STP operations and convergence
                                  - VLANs and trunking
                                  • 1. VLAN configuration and verification
                                    • 2. 802.1Q tagging

                                      >> JN0-351出題内容 <<

                                      一発合格問題 JN0-351 厳選問題集

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                                      Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) 認定 JN0-351 試験問題 (Q87-Q92):

                                      質問 # 87
                                      Which three statements are correct about OSPF packet types? (Choose three.)

                                      正解：A、D、E


                                      質問 # 88
                                      You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network.
                                      What two statements are correct in this scenario? (Choose two.)

                                      正解：B、D

                                      解説：
                                      A is correct because IBGP updates the next-hop attribute to ensure reachability within an AS. This is because the next-hop attribute is the IP address of the router that advertises the route to a BGP peer. If the next-hop attribute is not changed by IBGP, it would be the IP address of an external router, which may not be reachable by all routers within the AS. Therefore, IBGP updates the next-hop attribute to the IP address of the router that received the route from an EBGP peer1.
                                      B is correct because IBGP peers advertise routes received from EBGP peers to other IBGP peers. This is because BGP follows the rule of advertising only the best route to a destination, and EBGP routes have a higher preference than IBGP routes. Therefore, IBGP peers advertise routes learned from an EBGP peer to all BGP peers, including both EBGP and IBGP peers1.


                                      質問 # 89
                                      Exhibit

                                      Referring to the exhibit, which statement is correct?

                                      正解：B

                                      解説：
                                      Explanation
                                      In a Rapid Spanning Tree Protocol (RSTP) topology, the root bridge is determined by the switch with the lowest bridge priority value12. If all switches have the same priority, then the root bridge is assigned to the switch whose MAC address's hex value is the lowest2. The default bridge priority value is 3276832. However, without the actual exhibit, it's difficult to definitively determine which device is the root bridge. But based on the options provided, if we assume that the local device has a lower bridge priority or a lower MAC address than other devices in the network, then it could be considered as the root bridge for this RSTP topology45.


                                      質問 # 90
                                      What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

                                      正解：C

                                      解説：
                                      The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is
                                      1476 bytes. This is because GRE packets are formed by the addition of the original packets and the required GRE headers. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems. The most common IP MTU is 1500-bytes in length (Ethernet). When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet-24-bytes for the GRE encapsulation = 1476-Bytes.


                                      質問 # 91
                                      Which statement is correct about IP-IP tunnels?

                                      正解：A

                                      解説：
                                      IP-IP tunnels encapsulate IP packets within other IP packets, allowing them to traverse networks that wouldn ' t normally support the original IP packets. This encapsulation involves the TTL (Time-to-Live) of the inner packet being decremented as it traverses through the tunnel towards its endpoint.


                                      質問 # 92
                                      ......

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