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Juniper JN0-351 Exam Syllabus Topics:

SectionObjectives
Topic 1: 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
          Topic 2: Layer 2 Security- Switch security features
          • 1. Storm control
            • 2. MAC limiting
              Topic 3: High Availability- Junos HA features
              • 1. NSR / NSB
                • 2. Graceful restart
                  • 3. GRES
                    - Redundancy mechanisms
                    • 1. VRRP
                      • 2. BFD
                        Topic 4: Tunneling Technologies- IP tunneling
                        • 1. GRE tunnels
                          • 2. IP-IP tunnels
                            Topic 5: Layer 3 Routing Fundamentals- Routing concepts
                            • 1. Protocol-independent routing
                              • 2. Route preference and policy
                                - Routing protocols
                                • 1. IS-IS basics
                                  • 2. BGP fundamentals
                                    • 3. OSPF fundamentals and operations

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                                      Free PDF 2026 JN0-351: Latest Free Enterprise Routing and Switching, Specialist (JNCIS-ENT) Download

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                                      Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q47-Q52):

                                      NEW QUESTION # 47
                                      What are two characteristics of RSTP alternate ports? (Choose two.)

                                      Answer: B,C

                                      Explanation:
                                      * A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port 1 . However, an alternate port does not forward any traffic, as it is in a discarding state 2 . It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port 1 .
                                      * C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID 3 . However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself 1 .
                                      Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.


                                      NEW QUESTION # 48
                                      You are an operator for a network running 1S-IS. Two routers are failing to form an adjacency. What are two reasons for this problem? (Choose two.)

                                      Answer: B,C

                                      Explanation:
                                      The two reasons for the failure to form an adjacency in a network running IS-IS could be:
                                      B). There is no configured ISO address on any IS-IS interface. IS-IS requires each router interface to have an ISO address configured. Without this address, the routers cannot form an adjacency 1 .
                                      D). The family iso configuration is missing from the adjacency interface. The 'family iso' configuration is essential for IS-IS to function correctly. If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency 1 .
                                      These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks 2 3 .


                                      NEW QUESTION # 49
                                      A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)

                                      Answer: A,B,C

                                      Explanation:
                                      IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network. It supports multiple protocol topologies, including IPv4, IPv6, and multicast.


                                      NEW QUESTION # 50
                                      Which two statements are correct about IS-IS? (Choose two.)

                                      Answer: A,D


                                      NEW QUESTION # 51
                                      A number of reports from end users indicate that internal and external communications are intermittent and not reliable. You verified the status of the switch ports and have determined that they are up and operational. You also noticed a very high level of link bandwidth utilization on those same ports. The current topology of the affected environment is shown in the exhibit.

                                      What would be the cause of the reported issues?

                                      Answer: C


                                      NEW QUESTION # 52
                                      ......

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