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Juniper JN0-351 Exam Syllabus Topics:

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

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                                      Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q39-Q44):

                                      NEW QUESTION # 39
                                      You are concerned about spoofed MAC addresses on your LAN. Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)

                                      Answer: B,D

                                      Explanation:
                                      A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping. DAI discards any ARP packets that do not match the database or have invalid formats. C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports. DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client.


                                      NEW QUESTION # 40
                                      What is a purpose of using a spanning tree protocol?

                                      Answer: D

                                      Explanation:
                                      A broadcast storm is a network condition where a large number of broadcast packets are sent and received by multiple devices, causing congestion and performance degradation1. A broadcast storm can occur when there are loops in the network topology, meaning that there are multiple paths between two devices2.
                                      A spanning tree protocol is a network protocol that prevents loops from being formed when switches or bridges are interconnected via multiple paths. It does this by creating a logical tree structure that spans all the devices in the network, and disabling or blocking the links that are not part of the tree, leaving a single active path between any two devices3.
                                      By eliminating loops, a spanning tree protocol also eliminates broadcast storms, as broadcast packets will not be forwarded endlessly along the looped paths. Instead, broadcast packets will be sent only along the tree structure, reaching each device once and avoiding congestion3.


                                      NEW QUESTION # 41
                                      Which statement correctly describes the function of the Junos OS "family ethernet-switching" configuration on an interface?

                                      Answer: D

                                      Explanation:
                                      Configuring "family ethernet-switching" on a Junos OS interface enables Layer 2 switching functionality, allowing the interface to participate as an access or trunk port within one or more VLANs. This is a prerequisite for standard VLAN-based Layer 2 forwarding on EX Series switches.


                                      NEW QUESTION # 42
                                      Exhibit.

                                      The ispi _ inet. 0 route table has currently no routes in it.
                                      What will happen when you commit the configuration shown on the exhibit?

                                      Answer: C

                                      Explanation:
                                      The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device 1 . A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table 2 .
                                      The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. 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.
                                      In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table. This means that the routes from inet.0 will be imported into ispi.inet.0.
                                      Therefore, the correct answer is B. The inet.0 route table will be imported into the ispi.inet.0 route table.
                                      References:
                                      1 : Routing Instances Overview 2 : Virtual Routing Instances : [rib-group (Routing Options)]


                                      NEW QUESTION # 43
                                      Exhibit

                                      Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)

                                      Answer: A,D

                                      Explanation:
                                      A). On R1, enable Level 1 on the ge-0/0/1 interface. In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface 1 . Level 1 systems route within an area 2 . If the destination is outside an area, Level 1 systems route toward a Level 2 system 2 . Therefore, enabling Level 1 on the ge-0/0
                                      /1 interface on R1 would allow packets to reach from R1 to R3.
                                      D). On R3 enable Level 1 on the ge-0/0/4 interface Similarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3.
                                      These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks 1 and Cisco 3 4 .


                                      NEW QUESTION # 44
                                      ......

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