Security policies on SRX support several actions:
Permit: Allows traffic to pass according to the rule.
Deny: Silently drops the traffic without notifying the source.
Reject: Drops the traffic and sends a TCP RST (for TCP) or ICMP unreachable (for UDP/other protocols) back to the source. This provides feedback to the sending host.
Next-policy: Allows policy chaining to evaluate the next policy set.
Therefore, the action that causes traffic to drop and a message to be sent to the source is reject.

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.

In Junos OS, security zones are the foundation of SRX firewall policy enforcement. Logical interfaces must be assigned to zones. This enables:
Separation of traffic by zone boundaries.
Enforcement of security policies for traffic traversing between zones.
Control of traffic across VLANs, subnets, or functional areas (e.g., trust, untrust, DMZ).
Other options:
Zone assignment is not used to simplify interface configuration (A).
Routing protocols and updates (B) are handled by routing instances, not zones.
SNMP monitoring (D) is enabled under system or services configuration, not zones.

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 a predefined category in the Web filtering database.
Option B: Correct. The category "NG_Reference" indicates that the NextGen (Enhanced/Cloud-based) Web Filtering type is 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.

Screen options are used to detect and prevent attacks such as floods, scans, and malformed packets. In some cases, false positives may occur, where legitimate traffic is mistakenly identified as malicious.
To address this, administrators can configure the alarm-without-drop option (Option D). This setting generates alarms/logs for suspicious traffic without actually dropping it, allowing verification before taking further action.
Enabling all screen options (Option A) may increase false positives further.
Discarding traffic immediately (Option B) risks disrupting legitimate communication.
Increasing sensitivity (Option C) worsens the problem, since false positives would increase.
Correct Action: Use alarm-without-drop to log the traffic without dropping it.