Juniper JN0-335 Dumps

JIMS server is a Windows service application that collects and maintains user, device, and group information from Active Directory domains or syslog sources. JIMS server uses the Windows event logs to obtain user login and logout information from the domain controllers and Exchange servers. Therefore, to enable JIMS server to view the event logs, you need to perform the following actions:

• Enable remote event log management within Windows Firewall on the necessary domain controllers and Exchange servers. This allows JIMS server to access the event logs on these servers remotely. You can do this by using the Windows Firewall with Advanced Security snap-in or by using the netsh command. For example, to enable remote event log management on a domain controller, you can use the following command:

netsh advfirewall firewall set rule group="Remote Event Log Management" new enable=yes

• Enable remote event log management within Windows Firewall on the JIMS server. This allows JIMS server to receive the event logs from the domain controllers and Exchange servers. You can do this by using the same method as above. For example, to enable remote event log management on the JIMS server, you can use the following command:

netsh advfirewall firewall set rule group="Remote Event Log Management" new enable=yes

Option C and Option D show the correct actions for solving this issue. Option A and Option B are incorrect because they are not related to the JIMS server’s ability to view the event logs. Host-inbound-traffic rules are used to control the traffic that is allowed to reach the SRX Series devices, not the JIMS server. Enabling remote event log management on the Exchange servers is not necessary if JIMS server does not need to collect user information from them.

References: Juniper Security, Specialist (JNCIS-SEC) Reference Materials and Juniper Security, Professional (JNCIP-SEC) Reference Materials

SRX Series device chassis clusters are created by physically connecting two identical cluster-supported SRX Series devices using a pair of the same type of Ethernet connections. The connection is made for both a control link and a fabric (data) link between the two devices. The chassis cluster data plane is connected with revenue ports, which are the ports that carry user traffic. The chassis cluster can contain a maximum of two devices, as only two nodes can form a cluster. The chassis cluster data plane is not connected with SPC ports, which are the ports that provide services processing. The chassis cluster cannot contain more than two devices, as this would violate the cluster design. References: Chassis Cluster Overview, Connecting SRX Series Firewalls to Create a Chassis Cluster

• A stateful firewall in SRX Series devices keeps track of the state of network connections, distinguishing legitimate packets for different types of connections and allowing only packets that match a known active connection. Sessions are created when a TCP SYN packet is received and permitted by the security policy1.
• A security policy is a set of rules that defines how traffic is processed by the SRX Series device. A security policy applies the security rules to the transit traffic within a context (from-zone to to-zone) and each policy is uniquely identified by its name. The traffic is classified by matching the source and destination zones, the source and destination addresses, and the application that the traffic carries in its protocol headers with the policy database in the data plane2.
• A Layer 3 route is a path that a packet takes to reach its destination based on the destination IP address. The SRX Series device performs a longest-match Layer 3 route table lookup to determine the next hop for the packet3.
• An Application Layer Gateway (ALG) is a software component that provides application-level awareness, security, and control for specific protocols. An ALG inspects the application-layer payload of a packet and modifies it if necessary to allow the application to traverse the SRX Series device. For example, an ALG can rewrite IP addresses and port numbers in the payload of FTP or SIP packets4.
• The sequence that an SRX Series device uses when implementing stateful session security policies using Layer 3 routes is as follows3:

References:

• 1: Traffic Processing on SRX Series Firewalls Overview | Junos OS | Juniper Networks
• 2: Best Practices for Defining Policies on High-End SRX Series Devices - TechLibrary - Juniper Networks
• 3: [SRX] Example: Configuring TCP SYN Check options on a per-policy basis
• 4: Application Layer Gateways Overview | Junos OS | Juniper Networks

 To implement IPS on your SRX Series device, you need to download and install the IPS signature database. The IPS signature database contains the attack signatures and predefined attack groups that are used to detect and prevent intrusions. You can download the IPS signature database from the Juniper Networks website or from a local server. You can install the IPS signature database manually or automatically. You do not need to enroll the SRX Series device with Juniper ATP Cloud or reboot the SRX Series device to implement IPS34 References:

• Configuring the IPS Policy on SRX Series Devices Using NSM
• Installing SRX 1400 with IPS activation ??? | SRX - Juniper Networks
• Download an IPS Signature | J-Web for SRX Series 21.2 - Juniper Networks
• IPS Configuration (CLI) | Junos OS | Juniper Networks

The vSRX is a virtual firewall that offers the same features as the physical SRX Series firewalls, but in a virtualized form factor. It supports next-generation firewall (NGFW) capabilities, networking, and automated lifecycle management. It also integrates with cloud orchestration tools and software-defined networking (SDN) solutions1

The vSRX supports VMXNET3 vNICs, which are optimized for performance in virtualized environments. VMXNET3 vNICs offer enhanced networking features such as jumbo frames, hardware offloads, and multicast filtering2

The vSRX runs on Linux as the base OS, which provides a stable and secure platform for the Junos OS and the firewall functionality. Linux also enables the vSRX to leverage the native hypervisor drivers and APIs for better performance and compatibility3

References: 1: vSRX Virtual Firewall | Juniper Networks US 2: vSRX Virtual Firewall for VMware - TechLibrary - Juniper Networks 3: vSRX Overview - TechLibrary - Juniper Networks

• Referring to the SRX Series flow module diagram shown in the exhibit, application security is processed at the Services ALGs stage. Application Layer Gateways (ALGs) are software components that enable the SRX Series device to provide application-level security for specific protocols and applications1.
• ALGs inspect the application layer payload of packets and perform various actions, such as modifying the payload, opening pinholes, creating sessions, applying security policies, and enforcing application-specific behavior12.
• ALGs are required for protocols and applications that embed IP address information or port numbers in the application layer data, that open secondary connections, or that are dynamically assigned ports1. Some examples of protocols and applications that require ALGs are FTP, SIP, H.323, RTSP, PPTP, and DNS2.
• ALGs are configured as part of the security policy and are applied to the traffic that matches the policy criteria. ALGs can also be enabled or disabled globally or per zone12.

References:

• 1: Application Layer Gateways Overview
• 2: Application Layer Gateways Feature Guide for Security Devices

The vSRX is a virtual firewall that offers the same features as the physical SRX Series firewalls, but in a virtualized form factor for delivering security services that scale to match network demand. It offers the same features as the SRX appliance, including core firewall, robust networking, full next-gen capabilities, and automated life-cycle management1

The vSRX supports Layer 2 and Layer 3 configurations, which means it can operate as a transparent or a routed firewall, depending on the network topology and requirements. The vSRX can also support multiple routing instances, such as virtual routers, virtual switches, and logical systems, to provide logical separation and isolation of traffic2

The vSRX provides clustering, which enables two or more vSRX instances to act as a single, logical device that provides high availability, load balancing, and scalability. The vSRX cluster can synchronize configuration and session information, and support stateful failover and redundancy groups3

The cSRX is a containerized firewall that offers a compact footprint with a high-density firewall for virtualized and cloud environments. It is designed to secure microservices and containerized applications, and provide network visibility and threat prevention4

The cSRX does not support Layer 2 and Layer 3 configurations, as it is intended to be a lightweight and agile firewall that does not perform dynamic routing or networking functions. The cSRX relies on the underlying container orchestration platform, such as Kubernetes or Docker, to provide the network connectivity and management4

The cSRX does not provide clustering, as it is designed to leverage the native resiliency and scalability features of the container orchestration platform. The cSRX can be deployed as a standalone firewall or as part of a service chain, and can be dynamically scaled up or down based on the demand4

The cSRX has faster boot times than the vSRX, as it can be instantiated in seconds, compared to minutes for the vSRX. The cSRX also has a smaller image size and memory requirement than the vSRX, as it is optimized for containerized environments4

The cSRX provides NAT, IPS, and UTM services, similar to the vSRX, but with some limitations. The cSRX does not support IPSec VPN, application identification, user firewall, or SSL proxy. The cSRX also has lower performance and throughput than the vSRX, as it is constrained by the container resources and the orchestration platform4

References: 1: vSRX Virtual Firewall | Juniper Networks US 2: vSRX Virtual Firewall for VMware - TechLibrary - Juniper Networks 3: vSRX Cluster Overview - TechLibrary - Juniper Networks 4: Juniper vSRX versus cSRX - TechLibrary - Juniper Networks

Juniper ATP Cloud is a cloud-based service that provides advanced threat prevention for SRX Series devices. Juniper ATP Cloud can inspect files for malware by sending them to the cloud or performing a hash lookup. To reduce delays in the inspection of files, Juniper ATP Cloud performs the following two functions12:

• Juniper ATP Cloud allows the creation of allowlists. Allowlists are lists of trusted files or domains that are not sent to the cloud for inspection. This reduces the network traffic and the processing time for the files that are known to be safe. You can create allowlists from the Juniper ATP Cloud Web UI or the SRX Series device CLI.
• Juniper ATP Cloud performs a cache lookup on files. Cache lookup is a feature that checks if a file has been previously scanned by Juniper ATP Cloud and returns the cached verdict. This avoids sending the same file to the cloud again and saves bandwidth and time. Cache lookup is enabled by default and can be configured from the SRX Series device CLI. References:
• Juniper ATP Cloud User Guide
• Juniper ATP Cloud Deployment Guide for SRX Series Devices

An Application Layer Gateway (ALG) is a software component that is designed to manage specific protocols such as Session Initiation Protocol (SIP) or FTP on Juniper Networks devices running Junos OS. The ALG module is responsible for Application-Layer aware packet processing on switches1. The ALG can perform various functions such as modifying the payload and header of packets, opening secondary connections, translating addresses and ports, and applying security policies1. The ALG does not use software processes for permitting or disallowing specific IP address ranges, as this is the function of firewall filters or security zones2. The ALG does not use software that is used by a single TCP session using the same port numbers as the application, as this is the definition of a stateful firewall3. The ALG does not contain protocols that use one application session for each TCP session, as this is the characteristic of some application protocols such as HTTP or SMTP4. References:

• 1: ALG Overview | Junos OS | Juniper Networks
• 2: Firewall Filters Overview | Junos OS | Juniper Networks
• 3: Stateful Firewall Overview | Junos OS | Juniper Networks
• 4: Application Layer Protocols | Junos OS | Juniper Networks

• Cluster failovers occur when one node in a chassis cluster becomes inactive or unreachable, and the other node takes over the processing of traffic and services. To control when cluster failovers occur, you can configure two specific parameters on an SRX Series device: heartbeat-interval and heartbeat-threshold12.
• Heartbeat-interval is the time interval, in milliseconds, between heartbeat messages sent by each node to the other node. The default value is 1000 ms. You can configure the heartbeat-interval value from 100 through 3000 ms1.
• Heartbeat-threshold is the number of consecutive heartbeat messages that can be missed before a node is considered to be down. The default value is 3. You can configure the heartbeat-threshold value from 2 through 2551.
• The combination of heartbeat-interval and heartbeat-threshold determines the failover time, which is the maximum time it takes for a node to detect the failure of the other node and initiate a failover. The failover time is calculated as follows: failover time = heartbeat-interval x heartbeat-threshold1.
• For example, if the heartbeat-interval is 1000 ms and the heartbeat-threshold is 3, the failover time is 3000 ms. This means that if a node does not receive three consecutive heartbeat messages from the other node within 3000 ms, it will assume that the other node is down and initiate a failover1.
• You can configure the heartbeat-interval and heartbeat-threshold parameters using the set chassis cluster redundancy-group group-id node node-id priority priority heartbeat-interval interval heartbeat-threshold threshold command1.

References:

• 1: Configuring Chassis Cluster Redundancy Group Properties | Junos OS | Juniper Networks
• 2: Example: Configuring an Active/Passive Cluster Deployment | Junos OS | Juniper Networks

The SRX Series device will drop packets from the infected hosts with a threat level of 8 and no log message will be generated. This is because the security intelligence profile “ATP_Infected-Hosts” has a rule “Rule-1” that matches packets with a threat level of 8 and the action is to block and drop them. There is no log option specified in the action, so no log message will be generated. Options A and B are not correct because the rule only matches packets with a threat level of 8, not 8 or above. Option C is not correct because the action is to drop, not permit, the packets. References: The answer can be verified from Juniper’s official documentation on security intelligence available on their website. Here are some relevant links:

• Security Intelligence Feature Guide for Security Devices
• security-intelligence | Junos OS
• Configure the Security Intelligence Policy on the SRX Series Device

 This is because the error message indicates that the client device does not trust the certificate authority that issued the certificate for the external server. Therefore, you need to import the root CA certificate from the SRX Series device to the client device and add it to the trusted certificate store. This will allow the client device to verify the identity of the SRX Series device and accept the certificates it generates for the external servers3.

The other options are not correct because:

• A. Load a known good, but expired. CA certificate onto the SRX Series device. This will not solve the problem because the client device will still reject the certificates from the SRX Series device if they are signed by an expired CA certificate. The expiration date of the CA certificate is one of the factors that the client device checks when validating the certificate2.
• B. Install a new SRX Series device to act as the client proxy. This will not solve the problem because the new SRX Series device will still need to have a root CA certificate configured and imported to the client devices. The problem is not with the SRX Series device itself, but with the trust relationship between the SRX Series device and the client devices2.
• C. Reboot the SRX Series device. This will not solve the problem because rebooting the SRX Series device will not change the configuration or the certificates on the SRX Series device or the client devices. The problem is not caused by a temporary glitch or a malfunction, but by a mismatch between the certificates on the SRX Series device and the client devices2.

I hope this helps you understand the problem and the solution better. If you want to learn more about SSL client protection proxy, you can check out the following references:

• SSL Proxy Overview
• Configuring SSL Forward Proxy
• Configuring a Root CA Certificate
• SSL Proxy - Client Protection

SSL proxy uses application identification services to dynamically detect if a particular session is SSL encrypted.

AppQoS is a service that allows you to prioritize and manage the quality of service (QoS) for different types of applications on SRX Series devices. AppQoS uses application signatures to identify and classify the traffic, and then applies QoS policies to assign bandwidth, priority, and scheduling parameters to the traffic. AppQoS can help you optimize the performance of critical applications, such as VoIP, and ensure that they get the required bandwidth and latency in a congested network12. In this scenario, you can use AppQoS to prioritize the VoIP traffic over other traffic and guarantee its QoS on the SRX Series device at the branch office. References:

• Understanding Application Quality of Service
• Configuring Application Quality of Service

= The vSRX is a virtual firewall that offers the same features as the physical SRX Series firewalls, but in a virtualized form factor for delivering security services that scale to match network demand. The vSRX supports Juniper Contrail Networking and third-party software-defined networking (SDN) solutions, which enable dynamic and automated network provisioning and management. The vSRX also integrates with cloud orchestration tools such as OpenStack, which allow for flexible deployment and configuration of virtual machines and networks. The vSRX provides granular security for the workloads that run within the virtual network on the public or private cloud. It supports next-generation firewall capabilities, such as application security, intrusion prevention, user identity, and role-based access control. It also supports advanced threat prevention features, such as malware sandboxing, threat intelligence feeds, and encrypted traffic inspection. The vSRX can protect the network from both internal and external threats, and enforce consistent security policies across the entire network. References:

• vSRX Virtual Firewall | Juniper Networks US
• vSRX Documentation | Juniper Networks
• Understand vSRX Virtual Firewall with Microsoft Azure Cloud

SRX does not identify the iot device. It streams the metadata to Juniper ATP cloud and Junipe ATP cloud identifies the device.

 SSL proxy is a transparent proxy that performs SSL encryption and decryption between the client and the server. It allows inspection of encrypted traffic by terminating the SSL connection from either end and applying security policies to the clear text. SSL proxy can leverage pre-match or post-match results to determine whether to apply SSL proxy to a session. Pre-match results are based on the initial packet of the session, while post-match results are based on the application identification after the session is established. In the exhibit, the session shows that the application services identification is “ssl-proxy”, which means that SSL proxy is applied based on the pre-match results. The cache lookup status for application services is “on”, which means that the SRX Series device uses the application system cache to store the pre-match results for faster processing. Therefore, the correct answer is D. SSL proxy leverages pre-match result. References: = SSL Proxy, Configuring SSL Proxy, and Application System Cache

The infected host cloud feed is a list of IP addresses that have been identified as compromised or infected by malware. The feed is updated by Juniper ATP Cloud based on the detection of malicious activity from the hosts, such as contacting known command-and-control servers. When a host on the network reaches the configured threat level threshold, its IP address is automatically added to the infected host cloud feed and blocked from communicating with any other hosts on the Internet. The other feeds are not relevant for this situation. The command-and-control cloud feed is a list of IP addresses that are known to be used by malware for remote control and communication. The allowlist and blocklist feed is a user-defined list of IP addresses that are either allowed or denied by the SRX Series device. The custom cloud feed is a user-defined list of IP addresses that are associated with a specific category or threat level. References:

• Infected Hosts: More Information
• Juniper’s Attacker IP feed bolsters threat protection with SecIntel
• ATP Appliance and SRX Series Threat Level Comparison Chart

References:

• Security Policies Feature Guide for Security Devices
• Application Security User Guide for Security Devices
• Understanding Micro Application Detection
• Configuring Micro Application Detection
• Content Filtering Feature Guide for Security Devices

The cSRX is a containerized version of the SRX Series firewall that provides advanced security services, including content security, AppSecure, and unified threat management (UTM) in the form of a container1. The cSRX supports easy, flexible, and highly scalable deployment options covering various customer use cases, including application protection, microsegmentation, or as an edge gateway for secure IoT deployments through a Docker container management solution2. The cSRX also supports SDN via Contrail Enterprise Multicloud, OpenContrail, and other third-party solutions2. The cSRX also integrates with other next-generation cloud orchestration tools such as Kubernetes3.

The cSRX supports firewall, NAT, IPS, and UTM services, so option A is incorrect1. The cSRX does not only support Layer 2 “bump-in-the-wire” deployments, but also Layer 3 deployments with routing protocols such as BGP, OSPF, and IS-IS, so option B is correct4. The cSRX supports BGP, OSPF, and IS-IS routing services, so option C is correct4. The cSRX does not have three default zones, but instead inherits the zones from the host SRX Series device, so option D is incorrect5. References:

• 1: cSRX Container Firewall | Juniper Networks US
• 2: cSRX Container Firewall Datasheet | Juniper Networks US
• 3: Understanding cSRX with Kubernetes - Juniper Networks
• 4: Extending Security to All Points of Connection: Containerized Security …
• 5: cSRX Container Firewall | Juniper Networks UK&I

 The show security policies policy-name detail command shows policy counters for a configured policy. Policy counters display the number of packets and bytes that match the policy, as well as the number of sessions that are created, denied, or closed by the policy. Policy counters can help monitor and troubleshoot the traffic flow and security policy enforcement on the SRX firewall1.

The show security policies policy-name detail command does not display details about the default security policy, which is the implicit policy that is applied when no other policy matches the traffic. The default security policy can be viewed by using the show security policies default-policy command2.

The show security policies policy-name detail command does not identify the different custom policies enabled, which are the user-defined policies that specify the action and conditions for the traffic between zones. The custom policies can be viewed by using the show security policies command without any options1.

The show security policies policy-name detail command does not show the system log files for the local SRX Series device, which are the files that record the events and messages generated by the device. The system log files can be viewed by using the show log command with the name of the file3. References:

• 1: show security policies | Junos OS | Juniper Networks
• 2: Understanding Default Security Policies | Junos OS | Juniper Networks
• 3: show log | Junos OS | Juniper Networks

Statistical sampling is a technique that reduces the amount of flow data that is sent to JSA by sampling a subset of packets from the network device. Statistical sampling can help reduce network bandwidth and storage requirements, but it also increases processor utilization on the network device and decreases event correlation accuracy on JSA. Statistical sampling can also affect the accuracy of reports and searches that are based on flow data. Therefore, it is recommended to use statistical sampling only when necessary and with caution12.

BGP FlowSpec is not used to collect traffic flows from Junos OS devices, but to distribute firewall filter rules to routers that participate in BGP. BGP FlowSpec can help mitigate distributed denial-of-service (DDoS) attacks by filtering unwanted traffic based on flow attributes such as source and destination IP addresses, ports, and protocols3.

Superflows are not a method of collecting network traffic flows, but a way of grouping individual flows that match certain criteria into a single record. Superflows can help detect common attack vectors and reduce the number of flows that are stored on JSA. Superflows do not reduce traffic licensing requirements, but they can help optimize the performance and storage of JSA4. References:

• 1: Flow Sources | JSA 7.5.0 | Juniper Networks
• 2: JSA Events and Flows | JSA 7.5.0 | Juniper Networks
• 3: Understanding BGP FlowSpec
• 4: Superflows | JSA 7.5.0 | Juniper Networks

Policy Enforcer is a Junos Space Security Director component that allows updated security policies to be deployed across Juniper SRX Series firewalls, MX Series 5G Universal Routing Platforms, EX Series Ethernet Switches, QFX Series Switches, and third-party network devices1. Policy Enforcer can leverage the DDoS protection feature of Juniper devices to detect and mitigate DDoS attacks on the network. The DDoS protection feature is based on two main components: the classification of host-bound control plane traffic and a hierarchical set of individual- and aggregate-level policers that cap the volume of control plane traffic that each protocol type is able to send to the Routing Engine (RE) for processing2. The DDoS protection feature is supported on MX Series routers and QFX Series switches, among other devices3. Therefore, the correct devices to use for DDoS protection with Policy Enforcer are MX and QFX.

The other options are not correct for the following reasons:

• vQFX is a virtual switch that emulates the QFX Series switches for testing and development purposes. It does not support the DDoS protection feature4.
• vMX is a virtual router that emulates the MX Series routers for testing and development purposes. It does not support the DDoS protection feature.

References: Policy Enforcer DDoS Protection Case Study Protection against distributed denial of service (DDoS) attacks vQFX10000 Overview [vMX Overview]

Security policy schedulers are a feature that allows you to activate or deactivate a policy for a specified time period. You can create schedulers for a single or recurrent time slot, and apply them to one or more policies. A policy can only have one scheduler associated with it, but a scheduler can have multiple policies associated with it. When a scheduler is active, the policy is available for policy lookup. When a scheduler is inactive, the policy is unavailable for policy lookup. A policy without a defined scheduler will always be active, unless it is explicitly disabled. References:

• Scheduling Security Policies
• schedulers (Security Policies)
• Security Policy Schedulers
• scheduler (Security Policies)

 To create a security policy that will automatically add infected hosts to the infected hosts feed and block further communication through the SRX Series device, you need to add a security intelligence policy to the permit portion of the security policy. A security intelligence policy is a set of rules that defines the actions to be taken for traffic thatmatches a specific category of threat feeds, such as infected hosts, command and control servers, or botnets. By adding a security intelligence policy to the permit portion of the security policy, you can enable the SRX Series device to dynamically update the infected hosts feed based on the advanced anti-malware policy results, and block the traffic from or to the infected hosts. Options B, C, and D are not correct because they do not enable the automatic addition of infected hosts to the feed or the blocking of their communication. References: The answer can be verified from Juniper’s official documentation on security intelligence and advanced anti-malware available on their website. Here are some relevant links:

• Security Intelligence Feature Guide for Security Devices
• Advanced Anti-Malware Feature Guide for Security Devices
• Configuring Security Intelligence Policy on the SRX Series Device
• [Configuring Advanced Anti-Malware Policy on the SRX Series Device]

 The error occurred because the “http” application is not defined in this context of Juniper SRX Series device configuration. One solution is to create a custom application named “http” at the [edit applications] hierarchy level (Option C). Another solution is to modify the security policy to use the built-in “junos-http” application which is predefined and doesn’t need an explicit definition (Option D). Options A and B are not correct because they do not address the root cause of the error, which is the undefined application “http”. References: The answers can be verified from Juniper’s official documentation on security policies and applications available on their website. Here are some relevant links:

• Security Policies Feature Guide for Security Devices
• Understanding Applications and Application Sets for SRX Series Devices
• Configuring Custom Applications for SRX Series Devices
• Predefined Applications for SRX Series Devices

References:

• [SRX] Behavior of active sessions when modifying a security policy1

Unified policies are security policies that enable you to use dynamic applications as match conditions along with the existing 5-tuple or 6-tuple (with user firewall) match conditions to detect application changes over time3 If the traffic matches the security policy rule, one or more actions defined in the policy are applied to the traffic3 During the initial policy lookup phase, which occurs prior to a dynamic application being identified, if there are multiple policies in the potential policy list, the SRX Series Firewall applies the default security policy until a more explicit match has occurred2 The policy that best matches the application is the final policy2 APPID results are used to determine the final security policy1 References:

• 1: Unified Security Policies | Junos OS | Juniper Networks
• 2: Unified Policies Support for Flow | Junos OS | Juniper Networks
• 3: Unified Policy Overview - TechLibrary - Juniper Networks