Juniper Security, Associate (JNCIA-SEC) JN0-232 Exam Dumps: Updated Questions & Answers (November 2025)

Security policies in Junos OS match traffic based on specific criteria:

Source and destination addresses(Option B).

Application(Option D), which may be defined as services (e.g., tcp/80) or recognized through AppID.

Other options:

MAC addresses(Option A) are not used in policy matching; policies operate at Layer 3/4.

Interface name(Option C) is used in firewall filters, not in security policy definitions.

Correct Criteria:Source address and Applications

In Junos OS, NAT rules are evaluated intop-down order. When a new rule is added, it is placed at thebottomof the rule set by default.

To move a rule to the top of the rule set, the command is:

set security nat source rule-set rule top

Option A (top):Correct. Moves the specified rule to the top of the list.

Option B (run):Used to execute operational commands, not rule reordering.

Option C (up):Not valid for reordering NAT rules.

Option D (insert):Not a supported NAT reordering command in Junos.

Correct Command:top

PAT (Port Address Translation), also called NAT overload, allows many devices to share a single public IP:

Option C:Correct. Multiple internal hosts share a single external IP.

Option D:Correct. Each internal host is mapped to the same public IP but differentiated by unique port numbers.

Option A:This describes basic static NAT (1-to-1 mapping).

Option B:Incorrect, this describes general NAT behavior but not specific to PAT.

Correct Statements:PAT enables multiple internal devices to share one external IP, and it maps internal IPs to external IP + port.

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

NAT rule processing on SRX devices follows a deterministic order:

Top-to-bottom order (Option C):NAT rules are always evaluated in the order they appear in the configuration, starting at the top.

First-match wins (Option B):Once a packet matches a NAT rule, processing stops.

Option A:Incorrect. Not all rules are processed; evaluation stops at the first match.

Option D:Incorrect. NAT rules are never processed bottom-to-top.

Correct Statements:NAT rule processing stops at the first match, and NAT rules are processed top-to-bottom.

Global security policies extend the flexibility of policy enforcement across the SRX. They are not tied to specific source and destination zones:

From-zone and to-zone contexts are not required(Option A). Global policies apply across all zones unless restricted by match conditions.

Global security policies do not require specific zone contexts(Option B is incorrect).

Global policies areprocessed after zone-based policies, not before. This means that zone-based security policies take precedence (Option C is incorrect).

Administrators can configure bothzone-based security policies and global security policies at the same timeon the same device (Option D is correct).

This allows flexible designs where specific policies can be enforced by zone, while general policies can be applied globally without duplicating rules across multiple zones.

Unified security policies (USPs) provide integrated application-aware controls usingAppIDand extend traditional zone-based policy enforcement.

Option A:Correct. If traffic matches a unified security policy, it is not re-evaluated by traditional security policies. Unified policies take precedence for matched flows.

Option B:Incorrect. Traditional policies rely on Layer 3/4 attributes. Unified policies go deeper by leveraging AppID, which inspects traffic up to Layer 7.

Option C:Incorrect. Traffic matching a traditional policy is unaffected by unified policy unless unified mode is explicitly configured for those flows.

Option D:Correct. Dynamic application recognition in unified policies usesLayer 7 (application-layer) inspectionvia AppID.

Correct Statements:A and D

Intra-zone traffic:On SRX devices, traffic between interfaces in the same security zone is allowedwithout requiring a security policy(Option C is correct). Policies are only evaluated for inter-zone traffic.

Junos-host functional zone:This zone is a predefined functional zone that allows administrators to apply policies controlling access to the SRX firewall itself, such as SSH, HTTP, or SNMP traffic (Option D is correct).

Null zone:This zone is a predefined discard zone. Interfaces placed in the null zone drop all traffic. It does not allow policy logging of dropped control plane traffic (Option A is incorrect).

Management functional zone:This is used to define management interfaces, not the “functional zone” as stated in Option B (incorrect wording).

Correct Statements:C and D

Transit traffic is defined as traffic that passesthroughthe SRX (not destined to the Routing Engine). To capture transit traffic:

Sampling and port mirroring (Option D)are the correct supported methods for capturing or exporting transit traffic. Sampling allows captured packets to be sent to a file or collector, while port mirroring sends a copy to a monitoring interface.

Option A:Firewall filters on an egress interface cannot directly capture packets; they can only count, accept, discard, or sample. Sampling itself is separate.

Option B:Loopback interface (lo0) is for control-plane traffic, not transit traffic.

Option C:tcpdump is not supported on SRX as a tool for capturing transit packets; the operational command monitor traffic interface is used, but sampling/port mirroring is the recommended scalable approach.

Correct Method:Sampling and port mirroring