What are two system-defined zones created on the SRX Series Firewalls? (Choose two.)
Answer(s): A,B
On SRX Series Firewalls, Junos OS automatically creates system-defined zones that have special functions:Null zone (Option A): A predefined discard zone. By default, all interfaces belong to the null zone until assigned to a user-defined zone. Traffic destined to the null zone is dropped.Junos-host zone (Option B): A predefined functional zone that allows security policies to control traffic directed to the SRX device itself (management traffic, such as SSH, HTTP, SNMP).Management zone (Option C): There is a predefined management functional zone, but it is not called "management" as a system-defined security zone.DMZ (Option D): A DMZ zone must be explicitly created by the administrator, it is not system-defined.Correct Zones: null, junos-host
Juniper Networks – Security Zones and Functional Zones, Junos OS Security Fundamentals.
Which two statements about security zones are correct? (Choose two.)
Adding interfaces (Option A): An interface must be assigned to a security zone before it can pass traffic. By default, interfaces are in the null zone and cannot send or receive traffic.Exception traffic (Option B): Security zones define host-inbound-traffic settings, which determine what types of management or control-plane traffic (SSH, ICMP, SNMP) are permitted.Routing instances (Options C and D): Security zones are specific to a routing instance and cannot include interfaces from multiple instances. Therefore, interfaces in the same zone cannot belong to different routing instances.Correct Statements: A and B
Juniper Networks – Security Zones Overview, Junos OS Security Fundamentals.
Which two statements about destination NAT are correct? (Choose two.)
Answer(s): C,D
Destination NAT purpose (Option C): Used to allow external hosts on the Internet to access internal/private resources (such as a web server in the DMZ). Destination NAT changes the destination IP of incoming traffic to match the internal server.Pool-based NAT (Option D): SRX supports destination NAT pools, allowing multiple public IP addresses or ranges to be translated to internal servers.Incorrect options:Option A describes source NAT, not destination NAT.Option B is incorrect because SRX does not support “interface-based” destination NAT.Correct Statements: C and D
Juniper Networks – NAT Types and Configurations (Source, Destination, and Static), Junos OS Security Fundamentals.
Which two statements about the host-inbound-traffic parameter in a zone configuration are correct? (Choose two.)
Answer(s): B,D
SSH Access (Option B): Host-inbound-traffic controls traffic destined to the SRX device itself (management/control plane). If host-inbound-traffic is not configured to allow SSH, then SSH access to the firewall is blocked.Explicit Zone Configuration (Option D): For user-defined security zones, host-inbound-traffic must be explicitly configured to allow specific services (SSH, ICMP, SNMP, etc.).Console Access (Option A): Console access is not controlled by host-inbound-traffic. Console access is always available directly.Management Zone (Option C): In the management functional zone, host-inbound-traffic is implicitly allowed for management services, so this is not explicitly required.Correct Statements: B and D
Juniper Networks – Host-Inbound-Traffic and Zone Services, Junos OS Security Fundamentals.
Which zone configuration is required to permit transit traffic?
Answer(s): C
Transit traffic is defined as traffic passing through the SRX firewall (from one interface/zone to another). To allow transit traffic:Interfaces must be placed into a user-defined security zone (Option C).Policies between zones are then applied to control traffic.The null zone (Option A) discards all traffic.The Junos-host zone (Option B) is used for traffic destined to the SRX itself, not transit.Functional zones (Option D) are predefined and used for special purposes (like management), not for transit traffic.Correct Configuration: User-defined security zone
Juniper Networks – Security Zones and Transit Traffic, Junos OS Security Fundamentals.
Content filtering supports which two of the following protocols? (Choose two.)
Answer(s): A,D
Content filtering on SRX devices inspects and controls specific file types transferred across certain application protocols:SMTP (Option A): Supported. Content filtering can block specific file attachments in emails.HTTP (Option D): Supported. Content filtering can block downloads of specific file types over web traffic.SNMP (Option B): Not supported; SNMP is a management protocol, not a content delivery protocol.TFTP (Option C): Not supported by content filtering.Correct Protocols: SMTP and HTTP
Juniper Networks – Content Security and Filtering Supported Protocols, Junos OS Security Fundamentals.
Which two statements are correct about unified security policies on SRX Series Firewalls? (Choose two.)
Answer(s): B,C
Unified security policies integrate traditional zone-based policies with application-based policies.Their characteristics include:Zone-based or global (Option B): Unified policies can be applied as either zone-specific or global policies.AppID engine (Option C): They leverage the AppID engine for application identification, enabling fine-grained control at the application layer.Policy matching (Option A): Policies are evaluated sequentially like standard security policies; applications are not matched before policy processing.Multiple matches (Option D): If multiple policies could match, the first match applies (sequential order), not the “most restrictive.”Correct Statements: B and C
Juniper Networks – Unified Security Policies and AppSecure Integration, Junos OS Security Fundamentals.
You have a situation where legitimate traffic is incorrectly identified as malicious by your screen options.In this scenario, what should you do?
Answer(s): D
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.
Juniper Networks – Junos OS Screen Options and Troubleshooting, Junos OS Security Fundamentals.
Post your Comments and Discuss Juniper JN0-232 exam prep with other Community members:
Our website is free, but we have to fight against AI bots and content theft. We're sorry for the inconvenience caused by these security measures. You can access the rest of the JN0-232 content, but please register or login to continue.