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
Reference:Juniper Networks -Traffic Monitoring and Troubleshooting, Junos OS Security Fundamentals.

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.

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.
Reference:Juniper Networks -Source NAT and PAT Operations, Junos OS Security Fundamentals.

From the exhibit configuration:
[edit security policies from-zone Trust to-zone Trust]
policy allow-all {
match {
source-address any;
destination-address any;
application any;
}
then {
permit;
}
}
* Thefrom-zoneandto-zoneare both set toTrust # Trust.
* This means the policy is governing trafficwithin the same zone.
* Policies within the same zone are calledintra-zone policies.
Analysis of options:
* Global policy (A):Applied universally across zones, not zone-specific. Not the case here.
* Inter-zone policy (B):Applies between twodifferentzones (e.g., Trust # Untrust). Not the case here since both zones are Trust.
* Intra-zone policy (C):Correct. Applies to traffic within the same zone (Trust # Trust).
* Default policy (D):The implicit deny-all policy that applies when no policy matches. Not shown in this exhibit.
Correct Policy Type:Intra-zone policy
Reference:Juniper Networks -Security Policy Types (Inter-zone, Intra-zone, and Global), Junos OS Security Fundamentals.

* Inbound Flow (before NAT):Source =10.20.30.40(internal private IP)Destination =203.0.113.1(public DNS server)
* Outbound Flow (after NAT):Source =192.0.2.1(translated IP)Destination =203.0.113.1(unchanged) Analysis:
* Thesource IP (10.20.30.40)was translated to192.0.2.1. This indicatesSource NATwas applied #Option B is correct.
* Thedestination IP changedbetween the inbound and outbound view. Inbound it was203.0.113.1, and outbound it is still203.0.113.1in appearance, but notice the reversal: the session entry shows it as the outbound "source" side. This confirmsDestination NAT translation has occurredfor return flow consistency #Option D is correct.
* Option A:Incorrect. The original source IP was indeed translated.
* Option C:Incorrect. The destination IP did change in the flow processing.
Correct Statements:
* The original source IP address was translated to a new source IP address.
* The original destination IP address was translated to a new destination IP address.
Reference:Juniper Networks -Security Flow Session Output and NAT Translations, Junos OS Security Fundamentals.