Juniper Juniper Certifications JN0-637 Questions & Answers

• Question 61:

  You are deploying threat remediation to endpoints connected through third-party devices.

  In this scenario, which three statements are correct? (Choose three.)

  A. All third-party switches must support AAA/RADIUS and Dynamic Authorization Extensions to the RADIUS protocol.

  B. The connector uses an API to gather endpoint MAC address information from the RADIUS server.

  C. All third-party switches in the specified network are automatically mapped and registered with the RADIUS server.

  D. The connector queries the RADIUS server for the infected host endpoint details and initiates a change of authorization (CoA) for the infected host.

  E. The RADIUS server sends Status-Server messages to update infected host information to the connector.

  Correct Answer: ABD

  For threat remediation in a third-party network, the RADIUS protocol is necessary to communicate with the RADIUS server for details about infected hosts. CoA enables security measures to be enforced based on endpoint information

  provided by the RADIUS server. Details on this setup can be found in Juniper RADIUS and AAA Documentation.

  When deploying threat remediation to endpoints connected through third-party devices, such as switches, the following conditions must be met for proper integration and functioning:

  of Answer A (Support for AAA/RADIUS and Dynamic Authorization Extensions):

  Third-party switches must support AAA (Authentication, Authorization, and Accounting) and RADIUS with Dynamic Authorization Extensions . These extensions allow dynamic updates to be made to a session's authorization parameters,

  which are essential for enforcing access control based on threat detection.

  of Answer B (Connector Gathers MAC Information via API):

  The connector uses an API to gather MAC address information from the RADIUS server . This MAC address data is necessary to identify and take action on infected hosts or endpoints.

  of Answer D (Connector Initiates CoA):

  The connector queries the RADIUS server for infected host details and triggers a Change of Authorization (CoA) for the infected host. The CoA allows the connector to dynamically alter the host's access permissions or isolate the infected

  host based on its threat status.

  Juniper Security Reference:

  Threat Remediation via RADIUS: Dynamic remediation actions, such as CoA, can be taken based on information received from the RADIUS server regarding infected hosts. Reference: Juniper RADIUS and CoA Documentation.

• Question 62:

  Referring to the exhibit.

  

  A default static route on SRX-1 sends all traffic to ISP-A. You have configured APBR to send all requests for streaming video traffic to ISP-B. However, the return traffic from the streaming video server is coming through ISP-A, and the traffic is being dropped by SRX-1. You can only make changes on SRX-1.

  How do you solve this problem?

  A. Place both ISP-facing interfaces in the same zone.

  B. Change the APBR routing instance from a forwarding instance to a virtual router instance.

  C. Enable AppTrack to keep track of the sessions and zones for the streaming video traffic.

  D. Configure BGP to control the return path of the streaming video traffic.

  Correct Answer: B

  A virtual router instance allows for independent routing tables, which helps manage asymmetric routing issues in APBR configurations. This ensures both initial and return traffic follow the same path, resolving session issues. Further details: Juniper APBR Configuration.

  The issue in the scenario stems from asymmetric routing. The SRX-1 device sends streaming traffic to ISP-B (as intended) using APBR, but the return traffic is coming back through ISP-A due to the default route. Because APBR uses forwarding instances, the traffic is dropped when it returns through a different zone.

  To solve this: Change APBR routing instance to a virtual router (Answer B): By changing the APBR routing instance to a virtual router, the SRX will maintain separate routing tables for each ISP, ensuring proper bidirectional traffic flow. Virtual routers provide independent routing tables and are ideal for ensuring traffic symmetry in multi-homed environments. Example Command: bash Copy code set routing-instances ISP-B instance-type virtual-router set routing-instances ISP-B routing-options static route 0.0.0.0/0 next-hop 192.0.2.1 By implementing virtual routing instances, you can resolve the asymmetry and ensure that both outbound and return traffic use the same ISP.

• Question 63:

  You are asked to see if your persistent NAT binding table is exhausted.

  Which show command would you use to accomplish this task?

  A. show security nat source persistent-nat-table summary

  B. show security nat source summary

  C. show security nat source pool all

  D. show security nat source persistent-nat-table all

  Correct Answer: D

  The command show security nat source persistent-nat-table all provides a comprehensive view of all entries in the persistent NAT table, enabling administrators to monitor and manage resource exhaustion. Refer to Juniper NAT Monitoring

  Guide for more.

  In Junos OS, when persistent NAT is configured, a binding table is created to keep track of NAT sessions and ensure that specific hosts are allowed to initiate sessions back to internal hosts. To check if the persistent NAT binding table is full

  or exhausted, the correct command must display theentire table.

  Correct Command (D):

  The command show security nat source persistent-nat-table all will display the entire persistent NAT binding table. This allows you to check whether the table is exhausted or if there is space available for new persistent NAT sessions.

  Incorrect Options:

  Option A: The command show security nat source persistent-nat-table summary provides a summary view but does not give detailed insights into whether the table is exhausted. Option Band Option C : These commands deal with general

  NAT source summaries or pools, which are not related specifically to persistent NAT bindings.

  Juniper References:

  Juniper Persistent NAT Documentation: Describes the persistent NAT binding table and the commands used to monitor its status.

• Question 64:

  Referring to the exhibit.

  

  

  You are having problems configuring advanced policy-based routing.

  What should you do to solve the problem?

  A. Apply a policy to the APBR RIB group to only allow the exact routes you need.

  B. Change the routing instance to a forwarding instance.

  C. Change the routing instance to a virtual router instance.

  D. Remove the default static route from the main instance configuration.

  Correct Answer: C

  In this scenario, there is an issue with configuring APBR because the routing instance type may not be appropriate for handling the required routing functionality. In Juniper SRX devices, forwarding instances are used for simple path selection

  but do not have full routing capabilities like virtual router instances. To fully support advanced policy-based routing (APBR), it is recommended to use a virtual router instance, which provides full routing functionalities, including route tables

  and advanced routing protocols. Forwarding instances are limited in this respect and cannot handle the full range of routing tasks needed by APBR.

  Step-by-Step Solution:

  Change the Routing Instance Type:

  Convert the routing instance from a forwarding instance to a virtual router instance, which supports full routing and is compatible with APBR:

  bash

  Copy code

  set routing-instances instance-type virtual-router

  Configure the Static Routes in the Virtual Router:

  After changing the instance type, ensure that all necessary routes are configured within the new virtual router instance:

  bash

  Copy code

  set routing-instances routing-options static route 0.0.0.0/0 next-hop

  Juniper Security Reference:

  Virtual Router Instances: Virtual routers are necessary for advanced routing tasks, including APBR. They provide full routing capabilities, unlike forwarding instances which are used for basic routing needs.

  Reference: Juniper Virtual Router Documentation.

  By switching to a virtual router instance, you enable full routing functionality for APBR to work as expected.

• Question 65:

  Click the Exhibit button.

  

  Referring to the exhibit, which three actions do you need to take to isolate the hosts at the switch port level if they become infected with malware? (Choose three.)

  A. Enroll the SRX Series device with Juniper ATP Cloud.

  B. Use a third-party connector.

  C. Deploy Security Director with Policy Enforcer.

  D. Configure AppTrack on the SRX Series device.

  E. Deploy Juniper Secure Analytics.

  Correct Answer: ACD

  To isolate hosts at the switch port level when they become infected with malware, the SRX Series device must integrate with advanced threat detection and network management tools. Here's how the actions contribute to achieving this:

  of Answer A (Enroll SRX with Juniper ATP Cloud):

  Enrolling the SRX Series device with Juniper ATP Cloud allows for advanced malware detection and prevention. Juniper ATP (Advanced Threat Prevention) Cloud provides a cloud-based sandboxing solution that analyzes files and traffic for

  malicious behavior, helping to identify infected hosts.

  Once the SRX is enrolled, it can receive real-time threat intelligence from the cloud, enabling proactive isolation of compromised hosts.

  of Answer C (Deploy Security Director with Policy Enforcer):

  Security Directorwith Policy Enforcer allows for centralized security management and automated responses. Policy Enforcer can dynamically update policies to block infected hosts and isolate them based on detected threats. This is critical

  for automating the isolation process at the switch port level.

  With Policy Enforcer, you can quarantine infected devices automatically.

  of Answer D (Configure AppTrack on SRX):

  AppTrackis used to monitor and track application usage on the network. By configuring AppTrack on the SRX, you can detect abnormal behavior that may indicate malware infections, such as unusual application usage patterns. AppTrack

  can also generate logs and alerts to assist in isolating infected hosts at the switch port level.

  This provides visibility into which applications are being used, helping to identifymalicious traffic.

  Juniper Security Reference:

  Juniper ATP Cloud Overview: Integrates advanced malware detection and threat intelligence for proactive defense.

  Security Director with Policy Enforcer: Automates policy changes in response to threats, ensuring fast isolation of infected hosts. Reference: Juniper Security Director Documentation.

  AppTrack: Provides application visibility, monitoring, and threat detection. Reference: Juniper AppTrack Documentation.