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Juniper JN0-351 Exam Syllabus Topics:

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

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                                      Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q34-Q39):

                                      NEW QUESTION # 34
                                      Click the Exhibit button.

                                      You have configured a GRE interface, but no traffic will flow.
                                      Referring to the exhibit, which statement is true?

                                      Answer: A

                                      Explanation:
                                      According to the Juniper documentation 1 , the source and destination addresses of a GRE tunnel interface must be in different subnets. If they are in the same subnet, the router will not be able to route the GRE packets correctly. In the exhibit, the source and destination addresses are both in the 192.168.197.0/24 subnet, which is invalid for GRE tunneling. Therefore, the correct answer is D. References: Configuring GRE Tunnel Interfaces | Junos OS


                                      NEW QUESTION # 35
                                      You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem?
                                      (Choose two.)

                                      Answer: A,C

                                      Explanation:
                                      If the device connected to the interface has performed a DHCPRELEASE, it releases its IP address back to the DHCP server, resulting in the removal of the corresponding DHCP snooping entry.
                                      If the device connected to the interface is using a static IP address, it will not send DHCP requests, and therefore no entries will be created in the DHCP snooping database for that device.


                                      NEW QUESTION # 36
                                      Which statement is correct about controlling the routes installed by a RIB group?

                                      Answer: B

                                      Explanation:
                                      Explanation
                                      A RIB group is a configuration that allows a routing protocol to install routes into multiple routing tables in Junos OS. A RIB group consists of an import-rib statement,which specifies the source routing table, and an export-rib statement, which specifies the destination routing table or group. A RIB group can also include an import-policy statement, which specifies one or more policies to control which routes are imported into the destination routing table or group1.
                                      An import policy is a policy statement that defines the criteria for accepting or rejecting routes from the source routing table. An import policy can also modify the attributes of the imported routes, such as preference, metric, or community. An import policy can be applied to a RIB group by using the import-policy statement under the [edit routing-options rib-groups] hierarchy level1.
                                      Therefore, option A is correct, because an import policy is applied to the RIB group to control which routes are installed in the destination routing table or group. Option B is incorrect, because all routes in the source routing table are imported into the destination routing table or group, unless filtered by an import policy.
                                      Option C is incorrect, because a firewall filter is not used to install routes in the RIB groups; a firewall filter is used to filter packets based on various criteria. Option D is incorrect, because an export policy is not applied to the RIB group; an export policy is applied to a routing protocol to control which routes are advertised to other devices.
                                      References:
                                      1: rib-groups | Junos OS | Juniper Networks


                                      NEW QUESTION # 37
                                      Exhibit

                                      You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
                                      Referring to the exhibit, what is the reason for the problem?

                                      Answer: A

                                      Explanation:
                                      The exhibit shows the output of the command show ip bgp, which displays information about the BGP routes in the routing table1. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
                                      The route from R1 has a local preference of 200, while the route from R2 has a local preference of
                                      100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS)2. A higher local preference means a more preferred route2.
                                      BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence3. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router3. If the weight is equal or not set, the next attribute that is compared is local preference3.
                                      In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers3. Therefore, the next attribute that is compared is local preference. Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table3. The other attributes, such as origin code and AS path, are not considered in this case.


                                      NEW QUESTION # 38
                                      Which two statements are correct about Virtual Chassis technology on Juniper EX Series switches? (Choose two.)

                                      Answer: B,D

                                      Explanation:
                                      Virtual Chassis technology allows multiple physical Juniper EX Series switches to be interconnected and managed as a single logical device with a unified control plane. Within the Virtual Chassis, one member is elected as the master Routing Engine, responsible for managing the entire Virtual Chassis, while another member serves as the backup in case of a master failure.


                                      NEW QUESTION # 39
                                      ......

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