Free PDF 2026 JN0-351: Trustable Enterprise Routing and Switching, Specialist (JNCIS-ENT) Valid Exam Labs

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Juniper JN0-351 Exam Syllabus Topics:

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

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                                      Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q97-Q102):

                                      NEW QUESTION # 97
                                      Click the Exhibit button.

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

                                      Answer: C

                                      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 # 98
                                      Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)

                                      Answer: B,C

                                      Explanation:
                                      Redundant trunk groups are designed to provide link redundancy. If the primary link fails, the secondary link will automatically take over to ensure continued connectivity.
                                      In redundant trunk groups, while regular data traffic is sent over the primary link, Layer 2 control traffic (such as STP, LACP, etc.) is allowed on the secondary link to maintain network stability and protocol operations.
                                      https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic- map/redundant-trunk-groups.html


                                      NEW QUESTION # 99
                                      Your network has two ISPs available. You want to ensure that all outbound traffic is routed out ISP-1. If the connection to ISP-1 fails, all outbound traffic is routed to the backup ISP ISP-2. In this scenario, how should you configure BGP on your network?

                                      Answer: C


                                      NEW QUESTION # 100
                                      Exhibit.

                                      You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
                                      In this scenario, which action would solve the delay in RSTP convergence?

                                      Answer: D

                                      Explanation:
                                      * The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp
                                      . This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP 1 . This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence 2 .
                                      * The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches 3 . Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning: STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor 1 .
                                      * To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode 1 .


                                      NEW QUESTION # 101
                                      You are asked to explore deploying IS-IS in your network. What are two considerations in this scenario? (Choose two.)

                                      Answer: C,D


                                      NEW QUESTION # 102
                                      ......

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