Selected JN0-232 Associate JNCIA-SEC Questions Answers

Routing instances: Security zones are local to their routing instance. They cannot be shared between routing instances (Option B is correct). Each routing instance must define its own zones.

Intrazone and interzone traffic: Both types of traffic require policies in Junos OS. Intrazone traffic must have an explicit intra-zone policy to be controlled (Option C is correct).

Sharing zones: Option A is incorrect, as zones cannot span routing instances.

Multiple zones: SRX devices fully support multiple security zones (trust, untrust, DMZ, etc.). Option D is incorrect.

Correct Statements: B and C

In Juniper SRX flow-based packet processing, the flow module is 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, the session lookup occurs. 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 through route lookup, NAT processing, and security policy evaluation before 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.

The correct command is show security utm web-filtering status. This operational mode command verifies whether the web-filtering service connection is up. For NGWF, the SRX sends URL or destination IP information to the Juniper NGWF cloud, where the URL is categorized and reputation information is returned to the device. Because NGWF depends on cloud connectivity, checking web-filtering status is the appropriate troubleshooting and verification step. The anti-spam and anti-virus status commands verify different Content Security services, and content-filtering statistics show content-filter counters rather than cloud web-filtering connectivity. Juniper documentation also notes that this command can confirm whether web filtering is down because of a missing license or service condition.

Juniper SRX evaluates security policies in order, top to bottom . The first matching policy determines the action, and no further policies are evaluated. This behavior can lead to shadowed policies if later policies match the same conditions as earlier ones.

From the exhibit:

Policy1: Matches application junos-http and permits traffic.

Policy2: Matches application junos-https and permits traffic.

Policy3: Matches application junos-http again, but denies traffic.

Since policy1 already matches all HTTP traffic and permits it, traffic never reaches policy3 . This makes policy3 shadowed because it has the same match condition as policy1 but is evaluated later in the list.

Other options:

Policy1 is not shadowed because it is evaluated first.

Policy2 is independent (application = HTTPS) and therefore unaffected.

Only policy3 is shadowed by policy1.

Correct Statement: Policy3 will be shadowed because it matches the same application as policy1.