user@host# set security utm custom-objects url-pattern url-pattern-name https://www.juniper.net/documentation/us/en/software/junos/utm/topics/t opic-map/security-local-list-antispam-filtering.html

A screen option in the SRX Series device can be used to protect clients connected to the device from a SYN flood attack. Screens are security measures that you can use to protect your network from various types of attacks, including SYN floods. A screen option specifies a set of rules to match against incoming packets, and it can take specific actions such as discarding, logging, or allowing the packets based on the rules.

By default, TCP has a 30-minute idle timeout, and UDP has a 60-second idle timeout. Additionally, known IP protocols have a 30-minute timeout, whereas unknown ones have a 60-second timeout. Setting the inactivity timeout is very useful, particularly if you are concerned about applications either timing out or remaining idle for too long and filling up the session table. According to the Juniper SRX Series Services Guide, this can be configured using the 'timeout inactive' statement for the security policy.

The two correct statements about the Junos OS CLI are that the default configuration requires you to log in as the admin user, and that most Juniper devices identify the root login prompt using the > character. The factory-default login assigns the hostname "juniper" to the device and the root login prompt is usually identified with the % character. More information about the Junos OS CLI can be found in the Juniper Networks technical documentation here:https://www.juniper.net/documentation/en_ US/junos/topics/reference/command-summary/cli-overview.html.

Comprehensive Detailed Step-by-Step Explanation with All Juniper Security References:

Understanding UTM (Unified Threat Management) Features on SRX Devices:UTM is a security framework available on Juniper SRX Series devices that integrates multiple security features to protect against various threats. UTM functionalities are focused on advanced traffic inspection, content management, and threat prevention.

Explanation of Each Option:

Option A: Antivirus

UTM on SRX Series devices includes an antivirus feature that scans traffic for malware and viruses.

This feature is implemented using either:

Sophos Antivirus: A cloud-based solution.

Kaspersky Antivirus: A local database-based solution.

The antivirus feature detects and blocks malicious files, providing robust malware protection.

Correct.

Option B: NAT

Network Address Translation (NAT) is a fundamental networking feature on SRX devices but is not part of the UTM suite.

NAT is used to translate private IP addresses to public IP addresses and does not provide traffic filtering or threat management.

Incorrect.

Option C: IDP (Intrusion Detection and Prevention)

IDP is a separate feature on SRX devices for detecting and mitigating intrusions, but it is not part of the UTM framework.

IDP focuses on identifying malicious traffic patterns and blocking threats at the network level, whereas UTM focuses on content inspection and filtering.

Incorrect.

Option D: Content Filtering

Content filtering is a key UTM feature that blocks or allows traffic based on URL categories, keywords, and custom filtering rules.

This feature is used to restrict access to inappropriate or harmful websites and manage user behavior.

Correct.

UTM Features on SRX Devices Include:

Antivirus: Scans and blocks malware in real time.

Content Filtering: Manages access to websites and controls internet usage.

Web Filtering: Enforces policies on web content based on URL categories.

Spam Filtering: Blocks spam emails.

Juniper Security Reference:

Refer to the Juniper UTM Documentation for detailed configuration and feature details.

"Service objects represent applications and services that can be assigned to a security policy rule. Applications and services can either be predefined by Junos software or custom defined by the administrator."

The default value of the dead peer detection (DPD) interval for an IPsec VPN tunnel is 5 seconds. DPD is a mechanism that enables the IPsec device to detect if the peer is still reachable or if the IPsec VPN tunnel is still active. The DPD interval determines how often the IPsec device sends DPD packets to the peer to check the status of the VPN tunnel. A value of 5 seconds is a common default, but the specific value can vary depending on the IPsec device and its configuration.

The correct command to collect the serial number of an SRX Series device is the show chassis hardware command [1]. This command will return the serial number of the device, along with other information about the device such as the model number, part number, and version.

This command is available in Junos OS. More information about the show chassis hardware command can be found in the Juniper Networks technical documentation here [1]: https://www.juniper.net/documentation/en_US/ junos/topics/reference/command-summary/show-chassis-hardware.html.

This is necessary to ensure that the application firewall can properly identify the application and the correct security policies can be applied before allowing any traffic to pass through.

If the first packet was allowed to pass without first being identified, then the application firewall would not know which security policies to apply - and this could potentially lead to security vulnerabilities or breaches. So it's important that the first packet is held until the application is identified.

The Juniper ATP Cloud feed analysis components are the IDP signature feed and the C&C cloud feed. The IDP signature feed provides a database of signatures from known malicious traffic, while the C&C cloud feed provides the IP addresses of known command and control servers. The infected host cloud feed and US CERT threat feed are not components of the Juniper ATP Cloud feed analysis.

To learn more about the Juniper ATP Cloud feed analysis components, refer to the Juniper Networks Security Automation and Orchestration (SAO) official documentation, which can be found at https://www.juniper.net/documentation/en_US/sao/topics/concept/security-automation-and-orchestration-overview.html. The documentation provides an overview of the SAO platform and an in-depth look at the various components of the Juniper ATP Cloud feed analysis.

Use the persistent-nat feature to ensure that all requests from the same internal transport address are mapped to the same reflexive transport address (the public IP address and port created by the NAT device closest to the STUN server). The source NAT rule action can use a source NAT pool (with or without port translation) or an egress interface.

Malware Sandboxing

Detect and stop zero-day and commodity malware within web, email, data center, and application traffic targeted for Windows, Mac, and IoT devices. https://www.juniper.net/us/en/products/security/advanced-threat-prevention.html

Juniper ATP should be configured with C&C feeds that contain lists of malicious domains and IP addresses in order to prevent IP cameras from becoming zombies in a DDoS attack.

This is an important step to ensure that the IP cameras are protected from malicious requests - and thus, they will not be able to be used in any DDoS attacks against the facility.

Juniper Advanced Threat Prevention (ATP) Cloud is a security service that helps organizations protect against advanced threats by providing real-time threat intelligence and automated response capabilities. It combines a cloud-based threat intelligence platform with the security capabilities of Juniper Networks security devices to provide comprehensive protection against advanced threats. The two functions of Juniper ATP Cloud include malware inspection and Geo IP feeds. The malware inspection component provides real-time protection against known and unknown threats by analyzing suspicious files and determining if they are malicious. The Geo IP feeds provide a global view of IP addresses and their associated countries, allowing organizations to identify and block traffic from known malicious countries.

Static NAT (Network Address Translation) is a type of NAT that maps a public IP address to a private IP address. With static NAT, a one-to-one mapping is created between a public IP address and a private IP address. This means that a single public IP address is mapped to a single private IP address, and all incoming traffic to the public IP address is forwarded to the private IP address.

https://manuals.plus/m/95fded847e67e8f456453182a54526ba3224a61a337c47177244d345d1f3b19e.pdf

Juniper ATP Cloud is a cloud-based ATP subscription that delivers advanced threat protection services, such as URL categorization, file reputation analysis, and malware analysis. It is able to quickly and accurately categorize URLs and other web content, and can also provide detailed reporting on web usage, as well as the ability to define and enforce acceptable use policies. Additionally, Juniper ATP Cloud is able to block and allow specific IPs, providing additional protection against malicious content.

References: https://www.juniper.net/documentation/en_US/junos-space-security-director/topics/task/configuration /security-services-web-filtering-atp-cloud.html https://www.juniper.net/documentati on/en_US/junos-space-security-director/topics/task/configuration/security-services-web-filtering-atp-cloud-overview.html

Understanding the Policies in the Exhibit:The exhibit displays two policies configured on the Juniper SRX device for traffic between the trust zone and the dmz zone.

Policy 1:

Name: Trust-DMZ-Access

State: Enabled

Source Address: Trust-Net

Destination Address: DMZ-Net

Applications: junos-ftp, junos-ping

Action: permit

Log: Enabled

Policy 2:

Name: Trust-DMZ-Block

State: Enabled

Source Address: Trust-Net

Destination Address: DMZ-Net

Applications: junos-ssh

Action: deny, log

Analysis of Each Option:

Option A:

The Trust-DMZ-Access policy explicitly permits traffic for the junos-ftp and junos-ping applications.

This is validated by the action permit in the policy configuration.

Correct.

Option B:

This is incorrect because the Trust-DMZ-Access policy permits FTP and ping traffic rather than denying it.

Incorrect.

Option C:

The Trust-DMZ-Block policy explicitly denies traffic for the junos-ssh application.

Therefore, SSH access is not permitted.

Incorrect.

Option D:

The Trust-DMZ-Block policy denies SSH traffic from the Trust-Net to the DMZ-Net.

This is validated by the action deny.

Correct.

Juniper Security References:

Security Policy Overview:Security policies in Junos OS are used to control and filter traffic between security zones. Each policy defines:

Source and destination zones

Source and destination addresses

Applications or services

Action: permit, deny

Logging options

Policy Action Details:

permit: Allows the specified traffic.

deny: Blocks the specified traffic.

Application Identification:

Juniper SRX uses predefined application identifiers (junos-ftp, junos-ping, junos-ssh) for traffic matching.

Policy Evaluation Order:Policies are evaluated in sequence by their index number or sequence number. In this exhibit:

Trust-DMZ-Access is evaluated first (Sequence number: 1).

Trust-DMZ-Block is evaluated next (Sequence number: 2).

Conclusion:Based on the exhibit, FTP and ping traffic is permitted under Trust-DMZ-Access, and SSH traffic is denied under Trust-DMZ-Block. The answers to the question are therefore:

A. Correct

D. Correct

Refer to the Juniper Security Policy Documentation for more details on configuring and managing policies.