Free Juniper JN0-232 Practice Exam with Questions & Answers

From the exhibit, the content filter configuration is as follows:

Match Conditions:

Application:HTTP

Direction:download

File-types:exe

Action:

block

notification log

Analysis of Options:

Option A: Incorrect. The configuration specifies thedownload direction, not upload. Uploads of .exe files are unaffected.

Option B: Correct. Because the rule applies todownloads, .exe files will be blocked when users attempt to download them over HTTP.

Option C: Correct. The notification { log; } statement ensures that an entry will be added to the SRX device’s log when the action is triggered.

Option D: Incorrect. No configuration for sending e-mail notifications is shown in the rule. Only logging is specified.

Correct Statements:B and C

Functional zones(e.g., junos-host, management, null) are not used for forwarding transit traffic. They are used to manage traffic destined to or from the SRX device itself.

Option A:Correct. If traffic enters through a functional zone interface, it is meant for the SRX, not for transit, so it cannot exit another interface.

Option D:Correct. Transit interfaces handle forwarding traffic, but they cannot send that traffic out through a functional zone interface.

Option B and C:Incorrect, because functional zones are strictly control-plane, not transit forwarding zones.

Correct Statements:A and D

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.

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).

When source NAT uses a pool of addresses from thesame subnet as the egress interface, the firewall must respond to ARP requests for those NAT pool IPs. Without this, upstream devices would not know how to forward traffic destined for those IPs.

Proxy ARPis required (Option D). It enables the SRX to answer ARP requests on behalf of the NAT pool addresses.

Static NAT (Option A)is unrelated and maps one-to-one, not required here.

Dynamic DNS (Option B)has no relation to NAT pools.

Destination NAT (Option C)applies to inbound translations, not outbound source NAT pools.

Correct Feature:Proxy ARP

Juniper SRX evaluatessecurity policiessequentially from top to bottom. Once a policy match is found, no further policies are evaluated. In this exhibit:

First Policy (FTP, deny):

Source: 172.25.11.0/24

Destination: 10.1.0.0/16

Application: FTP

Action: deny⇒Any FTP traffic from 172.25.11.0/24 to 10.1.0.0/16 isdenied.

Second Policy (SSH, permit):

Same source/destination but application = SSH

Action = permit⇒SSH traffic from 172.25.11.0/24 to 10.1.0.0/16 ispermitted.

Third Policy (HTTPS, permit):⇒HTTPS from the same source/destination ispermitted.

Fourth Policy (Ping, permit):

Source: 172.25.11.0/24 to any destination

Application: ping

Action: permit⇒ICMP echo requests (ping) from 172.25.11.0/24 to any destination arepermitted.

Fifth Policy (any → any, deny):⇒Serves as a defaultdeny allat the end.

Now checking each option:

Option A:SSH from 172.25.11.10 → 10.1.0.10 matches theSSH permit rule(second policy).✅Correct.

Option B:Ping from 172.25.11.100 → 10.1.0.10 matches theping permit rule(fourth policy). This traffic is permitted, not denied.❌Incorrect.

Option C:FTP from 10.1.0.10 → 172.25.11.100 isreverse traffic (untrust to trust). The table applies onlytrust → untrust, so this policy does not apply.❌Incorrect.

Option D:FTP from 172.25.11.11 → 10.1.0.10 matches the first policy (FTP deny rule).✅Correct.

Correct Statements:A, D

Afeature profilein a UTM (Unified Threat Management) configuration defines how a specific UTM feature should operate. Examples include:

Anantivirus feature profilethat specifies the type of scanning to perform (streaming or full file-based).

Aweb filtering feature profilethat defines filtering methods, categories, and actions.

Anantispam profilethat defines how spam detection and actions are performed.

Feature profiles do not directly apply to traffic or policies. Instead, they arereferenced inside a UTM policy, and then that policy is applied to a security policy.

Therefore, a feature profile’s purpose is todefine the operation of a specific UTM feature.

The packet flow fornew trafficon SRX is processed in a defined order:

Screens (Option B, Step 1):Packets are first checked by screens for anomalies such as floods, malformed packets, or protocol violations.

Route Lookup (Step 2):The destination IP is checked in the routing table to determine the egress interface.

Zone Determination (Step 3):Once the ingress and egress interfaces are known, their associated zones are identified.

Security Policies (Step 4):With both zones determined, the packet is evaluated against the configured security policies.

Other options list incorrect sequences, either moving routing later or placing policies before zone determination, which is not possible.

Correct Processing Order:screens → routes → zones → security policies

When a new packet arrives that does not match an existing session, the SRX performs full flow-based processing. After ingress zone determination, the firewall must know the destination zone to evaluate security policies.

The SRX determines theegress zone by performing a route lookupon the packet’s destination IP address.

The routing decision identifies the outgoing interface, and the zone associated with that interface becomes theegress zone.

Session lookup (Option A) happens first but is only useful for existing sessions.

Destination port (Option B) is used for application identification, not zone determination.

Ingress zone properties (Option D) cannot determine the egress zone.

To verify and demonstrate the effectiveness of content filtering on an SRX firewall, administrators use operational mode commands that display UTM statistics.

The commandshow security utm content-filtering statisticsprovides detailed counters showing how many connections were inspected, how many were blocked, and other related metrics.

This is the correct way to measure and demonstrate filtering effectiveness.

Commands in options A, B, and C provide status information for antispam, antivirus, and web filtering features, but they do not provide content filter effectiveness statistics.