Juniper Juniper Certifications JN0-637 Questions & Answers

• Question 11:

  You are asked to establish IBGP between two nodes, but the session is not established. To troubleshoot this problem, you configured trace options to monitor BGP protocol message exchanges.

  

  

  Referring to the exhibit, which action would solve the problem?

  A. Add the junos-host zone policy to permit the BGP packets.

  B. Add a firewall filter to lo0 that permits the BGP packets.

  C. Modify the security policy to permit the BGP packets.

  D. Add BGP to the lo0 host-inbound-traffic configuration.

  Correct Answer: A

  In Juniper SRX devices, for IBGP (internal BGP) sessions to be established, the firewall must permit BGP traffic to the loopback interface (lo0). BGP uses TCP port 179, and the device must explicitly allow incoming connections to this port.

  The trace options show that the packets are reaching the firewall but are not permitted.

  Correct Action (A): Adding a security policy to the junos-host zone will permit the BGP packets. The junos-host zone represents traffic destined for the control plane (e.g., BGP traffic to the loopback interface). By creating a security policy that

  allows traffic on TCP port 179 to the junos-host zone, the IBGP session will be able to establish.

  Juniper References:

  Juniper SRX Host-inbound Traffic Configuration: Explains the importance of allowing host-inbound traffic for control plane protocols like BGP on the SRX devices.

• Question 12:

  Referring to the exhibit,

  

  Which three statements about the multinode HA environment are true? (Choose three.)

  A. Two services redundancy groups are available.

  B. IP monitoring has failed for the services redundancy group.

  C. Node 1 will host services redundancy group 1 unless it is unavailable.

  D. Session state is synchronized on both nodes.

  E. Node 2 will process transit traffic that it receives for services redundancy group 1.

  Correct Answer: ACD

  Referring to the exhibit for a multinode HA environment, we can conclude the following about the HA setup:

  Two Services Redundancy Groups (Correct: Option A):The output shows the status of SRG 0 and SRG 1 , confirming that there are two services redundancy groups in the HA configuration. Node 1 Hosting SRG 1 (Correct: Option C):The

  exhibit indicates that Node 1 is currently active for SRG 1 . According to the configuration, Node 1 will continue to host SRG 1 unless it becomes unavailable. Session State Synchronization (Correct: Option D):In this HA setup, session state

  synchronization is enabled between the two nodes. This ensures that sessions remain active and seamless failover can occur if one node fails.

  Juniper References:

  Juniper HA Documentation: Provides details on multinode HA setups, SRG configurations, and session synchronization.

• Question 13:

  You are deploying a large-scale VPN spanning six sites. You need to choose a VPN technology that satisfies the following requirements:

  1.

  All sites must have secure reachability to all other sites.

  2.

  New spoke sites can be added without explicit configuration on the hub site.

  3.

  All spoke-to-spoke communication must traverse the hub site.

  Which VPN technology will satisfy these requirements?

  A. ADVPN

  B. Group VPN

  C. Secure Connect VPN

  D. AutoVPN

  Correct Answer: D

  AutoVPN simplifies deployment by dynamically establishing tunnels from spokes to the hub. This architecture supports easy scaling with minimal configuration changes, ensuring spoke-to-spoke traffic flows through the hub. For more information, see Juniper AutoVPN Overview.

  In this scenario, you need a VPN solution that ensures secure, dynamic connectivity between multiple sites, with the following conditions:

  1.

  All sites must have secure reachability.

  2.

  New spoke sites can be added without explicit configuration on the hub site.

  3.

  Spoke-to-spoke communication must traverse the hub.

  The correct technology to meet these requirements is AutoVPN . It simplifies VPN configurations by automating the setup between hub and spoke sites. Additionally, AutoVPN automatically establishes secure tunnels for new spoke sites without requiring manual configuration at the hub, and all spoke-to-spoke traffic is routed through the hub.

• Question 14:

  Referring to the exhibit.

  

  Which two statements are correct? (Choose two.)

  A. You cannot secure intra-VLAN traffic with a security policy on this device.

  B. You can secure inter-VLAN traffic with a security policy on this device.

  C. The device can pass Layer 2 and Layer 3 traffic at the same time.

  D. The device cannot pass Layer 2 and Layer 3 traffic at the same time.

  Correct Answer: BC

  The exhibit provides information about an SRX Series device operating in transparent mode (Layer 2) and Layer 3 routing at the same time. Let's break down the correct answers:

  of Answer B (Secure Inter-VLAN Traffic with a Security Policy):

  The SRX device can secure inter-VLAN traffic because it supports security policies for Layer 3 traffic between different VLANs. In this case, traffic moving between different VLANs (i.e., Layer 3 traffic) can be processed and controlled using

  security policies.

  of Answer C (Pass Layer 2 and Layer 3 Traffic Simultaneously):

  The SRX device can handle both Layer 2 and Layer 3 traffic simultaneously. In mixed mode , the device is capable of switching traffic at Layer 2 (intra-VLAN) while also routing traffic at Layer 3 (inter-VLAN). This is evident from the global

  configuration showingtransparent bridge mode and Layer 3 interfaces.

  Juniper Security Reference:

  Mixed Mode Overview: Juniper SRX devices in mixed mode can operate as both a Layer 2 switch and a Layer 3 router, allowing it to pass traffic at both layers simultaneously. Reference: Juniper Mixed Mode Documentation.

• Question 15:

  What is the advantage of using separate st0 logical units for each spoke connection?

  A. It is easy to configure even when managing many st0 units.

  B. It facilitates scalability.

  C. Junos devices can exchange NHTB data automatically using this method.

  D. It enables assignments of different settings to each logical unit.

  Correct Answer: B

  Using separate st0 logical units for each spoke connection in a hub-and-spoke VPN topology is advantageous for scalability. Here's why:

  Facilitates Scalability (Correct: Option B):By using separate st0 logical units for each spoke, you can easily scale the number of spokes without disrupting the overall configuration. Each spoke gets its own dedicated logical unit, making it

  easier to manage individual VPN tunnels as the network grows. This approach provides clear separation of traffic, simplifying troubleshooting and configuration management, especially in large hub-and-spoke networks.

  Incorrect Options:

  Option A: While separate logical units make configuration management easier, scalability is the primary advantage.

  Option C: NHTB (Next-Hop Tunnel Binding) data exchange does not inherently depend on the use of separate logical units.

  Option D: While you can assign different settings to each logical unit, the main advantage remains scalability, especially when managing numerous VPN connections.

  Juniper References:

  Juniper IPsec VPN Documentation: Describes how using separate logical units facilitates scalability and is a best practice for large-scale hub-and-spoke VPN deployments.

• Question 16:

  In a multinode HA environment, which service must be configured to synchronize between nodes?

  A. Advanced policy-based routing

  B. PKI certificates

  C. IPsec VPN

  D. IDP

  Correct Answer: D

  Intrusion Detection and Prevention (IDP) services require synchronization between nodes in a multinode HA setup to maintain consistent attack detection and prevention across the network. This ensures seamless failover and accurate threat

  mitigation. For more information, see Juniper IDP HA Configuration Guide.

  In a multinode HA environment, IDP (Intrusion Detection and Prevention) services must be synchronized between nodes to ensure that the same threat detection and prevention rules are consistently applied across both nodes in the HA

  cluster. When IDP is used, the state and configuration of IDP signatures and actions need to be synchronized to ensure that failover or switchover between nodes does not cause discrepancies in security policies and inspection. IDP

  Synchronization: The synchronization ensures that both nodes are consistently analyzing traffic for threats and applying the same intrusion prevention mechanisms. If this service is not synchronized, the secondary node might fail to detect

  threats after a failover.

  Juniper References:

  Juniper IDP Synchronization: Explains the importance of synchronizing IDP services across HA nodes to maintain consistent security posture across both devices.

• Question 17:

  You are enabling advanced policy-based routing. You have configured a static route that has a next hop from the inet.0 routing table. Unfortunately, this static route is not active in your routing instance.

  In this scenario, which solution is needed to use this next hop?

  A. Use RIB groups.

  B. Use filter-based forwarding.

  C. Use transparent mode.

  D. Use policies.

  Correct Answer: A

  To enable advanced policy-based routing in Junos OS and activate a static route with a next-hop address in the inet.0 table within your routing instance, you should utilize RIB groups. RIB groups allow you to import routes from one routing

  table to another. In this scenario, the static route within the routing instance needs access to the inet.0 routes, which is facilitated by configuring a RIB group. Juniper's documentation outlines RIB groups as a necessary component for

  handling instances where routes need to be shared across routing tables, thereby ensuring seamless traffic flow through specified routes. For more details, refer to the Juniper Networks Documentation on RIB Groups.

  In Junos OS for SRX Series devices, when enabling advanced policy-based routing and configuring a static route with a next-hop from the inet.0 routing table, the issue arises because the static route is not being used in the routing instance.

  This is a common scenario when the next-hop belongs to a different routing table or instance, and the routing instance is not aware of that next-hop.

  To resolve this, RIB (Routing Information Base) groups are used. RIB groups allow routes from one routing table (RIB) to be shared or imported into another routing table. This means that the routing instance can import the necessary routes

  from inet.0 and make them available for the routing instance where the policy- based routing is applied.

  Detailed Steps:

  Configure the Static Route:First, configure the static route pointing to the next-hop in inet.0. Here's an example:

  bash

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  set routing-options static route 10.1.1.0/24 next-hop 192.168.1.1

  This static route will be placed in the inet.0 routing table by default.

  Create and Apply a RIB Group:To import routes from inet.0 into the routing instance, create a RIB group configuration. This will allow the static route from inet.0 to be visible within the routing instance.

  Example configuration for the RIB group:

  bash

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  set routing-options rib-groups RIB-GROUP import-rib inet.0

  set routing-options rib-groups RIB-GROUP import-rib .inet.0

  This configuration ensures that routes from inet.0 are imported into the specified routing instance.

  Apply the RIB Group to the Routing Instance:Once the RIB group is configured, apply it to the appropriate routing instance:

  bash

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  set routing-instances routing-options rib-group RIB-GROUP

  Verify Configuration:Use the following command to verify that the static route has been imported into the routing instance:

  bash

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  show route table .inet.0

  The output should now display the static route imported from inet.0.

  Juniper Security Reference: RIB Groups Overview: Juniper's documentation provides detailed information on how RIB groups function and how to use them to share routes between different routing tables. This is essential for scenarios involving policy-based routing where routes from one instance (like inet.0) need to be available in another instance. Reference: Juniper Networks Documentation on RIB Groups. By using RIB groups, you ensure that the static route from inet.0 is available in the appropriate routing instance for policy-based routing to function correctly. This avoids the need for other methods like filter- based forwarding or transparent mode, which do not address the specific issue of static route visibility across routing instances.

• Question 18:

  You have deployed automated threat mitigation using Security Director with Policy Enforcer, Juniper ATP Cloud, SRX Series devices, and EX Series switches.

  In this scenario, which device is responsible for blocking the infected hosts?

  A. Policy Enforcer

  B. Security Director

  C. Juniper ATP Cloud

  D. EX Series switch

  Correct Answer: A

  Policy Enforcer interacts with other network elements like EX switches to enforce blocking of infected hosts based on threat intelligence from ATP Cloud and other sources. For more information, refer to Juniper Policy Enforcer

  Documentation.

  In a Juniper automated threat mitigation setup involving Security Director Policy Enforcer Juniper ATP , , Cloud SRX Series , , and EX Series switches, the Policy Enforcer is the component responsible for blocking infected hosts. The role of

  each component is as follows:

  Policy Enforcer (Correct: Option A):Policy Enforcer receives threat intelligence from Juniper ATP Cloud and instructs SRX devices and EX Series switches to block or quarantine infected hosts. Policy Enforcer pushes policies to these devices

  to enforce the mitigation actions.

  Security Director (Incorrect):Security Director provides centralized management and visibility but does not directlyenforce policies. Juniper ATP Cloud (Incorrect):Juniper ATP Cloud is responsible for analyzing threats and providing

  intelligence but does not take direct mitigation actions. EX Series Switch (Incorrect):EX Series switches can enforce the policy pushed by Policy Enforcer but are not responsible for deciding which hosts to block.

  Juniper References:

  Juniper ATP Cloud and Policy Enforcer Documentation: Details the roles of each component in the automated threat mitigation architecture.

• Question 19:

  You are configuring an interconnect logical system that is configured as a VPLS switch to allow two logical systems to communicate.

  Which two parameters are required when configuring the logical tunnel interfaces? (Choose two.)

  A. Encapsulation ethernet must be used.

  B. The virtual tunnel interfaces should only be configured with two logical unit pairs per logical system interconnect.

  C. The logical tunnel interfaces should be configured with two logical unit pairs per logical system interconnect.

  D. Encapsulation ethernet-vpls must be used.

  Correct Answer: AC

  When configuring interconnect logical systems to act as a VPLS switch between two logical systems, the following configurations are necessary:

  Encapsulation Ethernet (Answer A): The logical tunnel interface must be configured with encapsulation ethernet. This allows the interface to carry Ethernet traffic between the logical systems.

  Command Example:

  bash

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  set interfaces lt-0/0/0 encapsulation ethernet

  Two Logical Unit Pairs (Answer C): Each logical tunnel interface should have two logical unit pairs defined to facilitate communication between the two logical systems. One logical unit pair connects each logical system.

  Command Example:

  bash

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  set interfaces lt-0/0/0 unit 0 family ethernet-switching

  set interfaces lt-0/0/0 unit 1 family ethernet-switching

  These settings are necessary for creating a logical tunnel for VPLS and allowing traffic between the logical systems.

• Question 20:

  Your customer needs embedded security in an EVPN-VXLAN solution. What are two benefits of adding an SRX Series device in this scenario? (Choose two.)

  A. It enhances tunnel inspection for VXLAN encapsulated traffic with Layer 4-7 security services.

  B. It adds extra security with the capabilities of an enterprise-grade firewall in the EVPN-VXLAN underlay.

  C. It adds extra security with the capabilities of an enterprise-grade firewall in the EVPN-VXLAN overlay.

  D. It enhances tunnel inspection for VXLAN encapsulated traffic with only Layer 4 security services.

  Correct Answer: AC

  The SRX Series can inspect traffic within VXLAN tunnels, providing in-depth security services across multiple layers. Adding SRX in the overlay network allows comprehensive control, leveraging advanced firewall capabilities. For more

  details, see Juniper EVPN-VXLAN Security.

  When integrating an SRX Series device into an EVPN-VXLAN solution, it offers several security benefits:

  Layer 4-7 Security Services (Answer A): The SRX can provide deep packet inspection for VXLAN encapsulated traffic, enhancing security by offering services such as intrusion prevention, application layer filtering, and antivirus scanning.

  This allows security monitoring of the encapsulated traffic at higher layers of the OSI model (Layers 4-7), which is essential for advanced threat detection. Security in the Overlay Network (Answer C): The SRX adds security by functioning as

  an enterprise- grade firewall within the EVPN-VXLAN overlay . This means that traffic flowing between virtualized segments or networks can be inspected and filtered using SRX firewall rules, ensuring that the VXLAN overlay remains secure.

  These features make the SRX a powerful addition for securing EVPN-VXLAN environments, providing comprehensive security for encapsulated traffic and ensuring that both the underlay and overlay networks are protected.