From the exhibit:
* The internal host (172.25.11.101) is located in theTrust zone.
* The external address (203.0.113.199/30) is used for communication with the ISP.
* The requirement is thatsessions can only be initiated from the external device(the ISP or untrust side) toward the internal host.
This requirement matches the behavior ofDestination NAT:
* Destination NAT only (Option A):Maps the external/public IP (203.0.113.199) to the internal/private IP (172.25.11.101). This allows inbound connections to be translated and sent to the internal host. The internal host cannot initiate outbound sessions, since the translation only applies to inbound traffic.
* Source NAT only (Option B):Used for outbound sessions from internal private IPs to the Internet.
This does not meet the requirement.
* Static PAT (Option C):Maps a single port of a public IP to a private IP/port. The exhibit does not indicate a port-based translation.
* Static NAT and source NAT (Option D):Would provide bidirectional communication, allowing sessions to be initiated in both directions. This contradicts the requirement.
Correct NAT Type:Destination NAT only
Reference:Juniper Networks -NAT Types (Source NAT, Destination NAT, Static NAT), Junos OS Security Fundamentals.

Screen options are used to detect and prevent attacks such as floods, scans, and malformed packets. In some cases,false positivesmay occur, where legitimate traffic is mistakenly identified as malicious.
* To address this, administrators can configure thealarm-without-dropoption (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.
Reference:Juniper Networks -Junos OS Screen Options and Troubleshooting, Junos OS Security Fundamentals.

When a packet enters an SRX interface, aroute lookupis performed:
* It determines theegress interface(Option B) by checking the destination IP against the routing table.
* Once the egress interface is known, its associatedegress security zone(Option D) is also determined.
* Theingress interface (Option A)is already known when the packet arrives, so the route lookup does not determine it.
* DNS name (Option C):DNS is unrelated to routing lookups.
Correct Results:egress interface, egress security zone
Reference:Juniper Networks -Packet Flow and Route Lookup, Junos OS Security Fundamentals.

NextGen Web Filtering (NGWF) requires SSL proxy functionality to inspect HTTPS traffic. To enable NGWF:
* Option B:You can generate aself-signed certificatefor SSL proxy functionality (or import a CA-signed certificate, but the course emphasizes self-signed for lab/demo purposes).
* Option D:You must configure anSSL proxy profileso that HTTPS traffic can be decrypted and inspected.
* Option A:A CA-signed certificate may be used in production but is not strictly required to enable NGWF.
* Option C:SSL initiation profiles are used for outbound SSL inspection initiated by the SRX, not for NGWF traffic interception.
Correct Actions:Generate a self-signed certificate, Configure an SSL proxy profile Reference:Juniper Networks -NextGen Web Filtering Configuration with SSL Proxy, Junos OS Security Fundamentals.

* Global policies (Option D):Evaluated before zone-based policies. They allow centralized control and can apply across all zones. Perfect for Internet-to-private traffic that must be enforced before other rules.
* Routing policy (Option A):Controls routing decisions, not traffic forwarding/security.
* Default policy (Option B):Denies all traffic by default, but cannot be customized for early evaluation.
* Zone policy (Option C):Zone-based policies apply after global policies and are limited to specific zone pairs.
Correct Policy Type:Global policy
Reference:Juniper Networks -Global Security Policies vs Zone-Based Policies, Junos OS Security Fundamentals.