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NEW QUESTION # 31
What is the purpose of rate-limiting exception traffic in the Junos OS?
Answer: C
Explanation:
Exception traffic is traffic that must be sent from the Packet Forwarding Engine (PFE) to the Routing Engine (RE) for processing, such as routing protocol updates, management traffic, or other control-plane packets.
Because the RE is a limited and critical resource, Junos OS implementsrate limiting on exception traffic.
* The purpose is toprevent denial-of-service (DoS) attacks on the Routing Engineby controlling the amount of traffic directed to it.
* This ensures the RE continues to process control-plane operations reliably, even under potential attack or heavy traffic conditions.
* Rate limiting does not enhance forwarding plane performance (Option A), simplify interface configuration (Option B), or manage routing protocols directly (Option D).
Reference:Juniper Networks -Junos OS Security Fundamentals, Exception Traffic Handling.
NEW QUESTION # 32
When does screening occur in the flow module?
Answer: B
Explanation:
In Juniper SRX flow-based packet processing, theflow moduleis responsible for security functions such as screening, session management, NAT, and policy enforcement. The processing order is critical:
* Screens are applied before any session lookup.This ensures that packets are inspected for anomalies, floods, or protocol violations before consuming resources for session management. Examples of these screens include TCP SYN flood protection, ICMP flood protection, and port scanning protection.
* After screening, thesession lookupoccurs. At this point, the firewall checks whether the packet belongs to an existing session in the session table. If a matching session is found, the packet bypasses policy evaluation and is forwarded according to the session state.
* If no existing session is found, the packet continues throughroute lookup, NAT processing, and security policy evaluationbefore a new session is created.
Thus,screening occurs before the session lookup, protecting the system early in the flow process. This design ensures efficiency by dropping malicious or malformed traffic before allocating session resources.
Reference:Juniper Networks -SRX Series Services Gateways Security Processing (Flow Module Sequence), Junos OS Security Fundamentals, Official Course Guide.
NEW QUESTION # 33
What is a purpose for creating multiple routing instances on an SRX Series Firewall device?
Answer: C
Explanation:
Multiplerouting instances(such as virtual routers or VRFs) can be configured on an SRX to provide separation of routing tables. This enables:
* Maintaining separation of routing information (Option B):Different departments, tenants, or customers can have their own independent routing domains for security and isolation.
* SNMP monitoring (Option A) is unrelated to routing instances.
* Routing protocols (Option C) can be run inside each instance, but the purpose of multiple instances is separation, not general routing protocol management.
* Simplifying interface configuration (Option D) is not a function of routing instances.
Correct Purpose:To maintain separation of routing information for security purposes.
Reference:Juniper Networks -Routing Instances and Virtual Routers, Junos OS Security Fundamentals.
NEW QUESTION # 34
Click the Exhibit button.
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: C,D
Explanation:
From the exhibit:
* The user attempted to access https://www.wikipedia.org.
* The block page indicates:
* CATEGORY: NG_Reference
* REASON: BY_PRE_DEFINED
* The header states:"Juniper Web Filtering has been set to block this site." Analysis of options:
* Option A:Correct. The log shows "REASON: BY_PRE_DEFINED," which means the site was blocked because it matched apredefined categoryin the Web filtering database.
* Option B:Correct. The category "NG_Reference" indicates that theNextGen (Enhanced/Cloud- based) Web Filtering typeis being used.
* Option C:Incorrect. The exhibit does not provide any information about SSL proxy configuration; it only shows that the HTTPS site was blocked.
* Option D:Incorrect. The block page shown is the standard Juniper default block page, not a custom message.
Correct Statements:The URL matches a predefined Web filtering category, and the NextGen Web Filtering type is being used.
Reference:Juniper Networks -Web Filtering (SurfControl, Enhanced, and NextGen Web Filtering), Junos OS Security Fundamentals.
NEW QUESTION # 35
What are two ways that an SRX Series device identifies content? (Choose two.)
Answer: A,B
Explanation:
SRX Series devices providecontent securityfeatures that rely on advanced identification mechanisms. File identification is not based merely on file extensions (which can be easily spoofed), but instead ondeep inspection techniques:
* AppID (Application Identification):AppID is part of the AppSecure suite, allowing the device to classify applications and content regardless of port or protocol. This enables the SRX to detect applications and their related content for enforcement.
* Protocol-based file type identification:The SRX can recognize and identify file types embedded withinHTTP, FTP, and e-mail (SMTP, IMAP, POP3) protocols. This providesaccurate content inspection and filtering, independent of file naming conventions.
* Why not the others?
* File extensions (Option A) are not reliable for content security, so SRX does not use them.
* ALGs (Option D) are used for protocol handling, such as SIP or FTP control channels, not for content identification.
Reference:Juniper Networks -Content Security and AppSecure Overview, Junos OS Security Fundamentals, Official Course Guide.
NEW QUESTION # 36
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