JN0-232 Practice Questions

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.

License Requirement (Option B):NextGen Web Filtering (NGWF) is a licensed feature on SRX devices. Without a license, the service cannot operate.

Local vs. Cloud Lists (Option C):NGWF checkslocal block/allow lists first. If the URL does not match locally, the request is then checked against the Juniper cloud database.

Option A:Incorrect, since the cloud is only consulted if the URL is not in the local list.

Option D:Incorrect, as NGWF requires a valid subscription/license.

Correct Statements:NGWF requires a license, and it checks local lists before cloud lookup.

Default assignment:All logical interfaces are placed in thenull zone by defaultuntil explicitly assigned to a user-defined security zone (Option A is correct).

Removal from null zone:Once an interface is assigned to a security zone, it is removed from the null zone (Option D is correct).

No traffic acceptance:The null zone is a discard zone; it cannot be configured to accept any traffic (Option C is incorrect).

Policy behavior:Traffic rejected by a security policy is dropped according to the policy action. It is not forwarded to the null zone for logging (Option B is incorrect).

Correct Statements:A and D

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