Pass the Juniper JNCIS-SEC JN0-335 Questions and answers with ValidTests

 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

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

To manually failover the primary Routing Engine in an SRX Series high availability cluster pair, you need to issue the request chassis cluster failover redundancy-group group-id node node-id command on the primary node, where group-id is the redundancy group number and node-id is the node number of the secondary node. This command initiates a graceful failover of the specified redundancy group to the secondary node, making it the new primary node. The other options are not necessary or correct for this task. Option A would disable the chassis cluster and reboot the primary node, which is not a graceful failover. Option B is not relevant, as the control link recovery solution is used to restore the control link connectivity between the nodes, not to initiate a failover. Option D would not trigger a failover, as the priority of the secondary node would only take effect after a reboot or a control link failure. References:

Chassis Cluster Redundancy Group Manual Failover

Initiating a Chassis Cluster Manual Redundancy Group Failover

SRX Getting Started - Troubleshoot High Availability (HA)

A vSRX is a virtualized security platform that runs on various hypervisors and cloud environments. It provides firewall and NAT services, as well as other security features, such as IPS, VPN, UTM, and AppSecure. A single vSRX can fulfill the minimum requirements for providing firewall and NAT services in a private cloud, as it can be deployed as a gateway or an edge device, and can scale up or down as needed. A vSRX can also interoperate with other Juniper and third-party products, such as Contrail Networking, Junos Space Security Director, and Sky ATP. A single vSRX is more cost-effective and simpler to manage than having separate vSRX instances for firewall and NAT services. A cSRX is a containerized version of vSRX that runs on Linux-based platforms. It provides similar security features as vSRX, but with a smaller footprint and faster deployment. However, a cSRX is not yet supported on all cloud environments, and it may have some limitations compared to vSRX, such as lower throughput and fewer interfaces. Therefore, a single cSRX may not be able to fulfill the minimum requirements for providing firewall and NAT services in a private cloud, depending on the specific cloud platform and the performance and scalability needs. A cSRX for firewall services and a separate cSRX for NAT services would also introduce more complexity and overhead than a single vSRX. References: vSRX Overview, cSRX Overview, JNCIP-SEC Certification

A reth LAG is a redundant Ethernet interface that includes one or more physical interfaces from each node of a chassis cluster. A reth LAG provides increased bandwidth and link availability for the cluster. To configure a reth LAG, you need to follow these steps:

Configure the physical interfaces on each node as aggregated Ethernet interfaces with the same speed and duplex settings. This is required to ensure that the links can form a LAG andpass traffic correctly. You can use different cable types (such as copper or fiber-optic) for the links, but the speed must be the same.

Configure the reth interface with the redundant-ether-options statement and specify the aggregated Ethernet interfaces as child links. You should have at least two interfaces (one from each node) in the reth LAG, but you can add more for redundancy and load balancing. You can also specify the minimum-links statement to set the minimum number of child links that must be up for the reth interface to be up. The default value is one, but you can change it to a higher value if needed.

Configure the reth interface with the appropriate IP address, security zone, and other settings as needed. You can also enable LACP on the reth interface to dynamically negotiate the LAG parameters with the peer devices.

References:

[Aggregated Ethernet Interfaces in a Chassis Cluster] 1

[Chassis Cluster Redundant Ethernet Interfaces] 2

[LACP / LAG on Chassis Cluster - Interface Monitoring?] 3

[URGENT (LAG - RETH Interconnect)] 4

Juniper ATP Cloud is a cloud-based threat detection service that protects all hosts in your network against evolving security threats. It assigns a threat level to each attacker IP address from 1 to 10, with 10 being the highest severity. Once the target threshold ismet, Juniper ATP Cloud continues looking for threats for a configurable duration from 0 to 10 minutes. This allows Juniper ATP Cloud to collect more information about the attacker and the attack vector, and to update the threat intelligence accordingly. The other options are incorrect. Option A is not configurable, and option D is not consistent with the documentation. References:

Juniper Advanced Threat Prevention Cloud | Juniper Networks

Juniper’s Attacker IP feed bolsters threat protection with SecIntel

Encrypted Traffic Insights is a feature of Juniper ATP Cloud and SRX Series firewalls that can detect malicious threats that are hidden in encrypted traffic without intercepting and decrypting the traffic. It permits organizations greater visibility and policy control over encrypted traffic, without requiring resource-intensive SSL Decryption1.

Encrypted Traffic Insights assesses the threat of the traffic by using two methods:

It validates the certificates used by the external servers that the internal hosts are trying to connect to. It compares the certificate signatures with a blocklist of known malicious certificates and also checks the certificate validity, issuer, and subject. If the certificate is invalid or matches a malicious signature, the connection is blocked or alerted2.

It reviews the timing and frequency of the connections to the external servers. It uses behavior analysis and machine learning to identify patterns and anomalies that indicate malicious activity, such as command and control (C&C) communications, botnet traffic, or data exfiltration. It also uses threat intelligence feeds to enrich the analysis and provide additional context2.

Encrypted Traffic Insights does not decrypt the file or the data in a sandbox or to validate the hash, as these methods would require breaking the encryption of the traffic, which would violate data privacy laws and introduce latency and performance issues21. References:

3: SRX5400, SRX5600, SRX5800 Firewalls Datasheet - Juniper Networks

2: Encrypted Traffic Insights Overview and Benefits | ATP Cloud | Juniper …

1: Juniper Networks Expands Connected Security Portfolio with Encrypted …

 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

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

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