Free Juniper JN0-232 Practice Exam with Questions & Answers | Set: 4

Juniper SRX evaluates security policies sequentially 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 is denied .

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 is permitted .

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

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 are permitted .

Fifth Policy (any → any, deny): ⇒ Serves as a default deny all at the end.

Now checking each option:

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

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

Option C: FTP from 10.1.0.10 → 172.25.11.100 is reverse traffic (untrust to trust) . The table applies only trust → 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

The management functional zone on SRX devices is a special predefined zone with unique characteristics:

It is automatically created (Option C) and cannot be deleted.

It is used specifically for management-related traffic (Option A), such as SSH, Telnet, web management (J-Web), SNMP, and other control-plane services.

It does not contain revenue (data) interfaces (Option B is incorrect). Interfaces must be explicitly configured into user-defined zones.

The management zone can be referenced in policies if inter-zone communication involving management traffic is needed (Option D is incorrect).

Correct Statements: A and C

For an SRX firewall interface to respond to management traffic such as ICMP pings:

The interface must be assigned to a security zone (Option A). If an interface is not part of any zone, it is placed into the null zone, which drops all traffic.

Additionally, the zone must be configured to allow management traffic types as host-inbound-traffic (Option D). For ICMP, the protocol must be explicitly allowed under host-inbound-traffic for that zone.

Other options:

Security policies (Option B) control traffic traversing the firewall, not traffic destined to the SRX device itself.

Assigning the interface to the null zone (Option C) prevents any communication, including management.

Correct Actions: Assign the interface to a zone and configure ICMP under host-inbound-traffic.