Which two statements are correct about security zones and functional zones? (Choose two.)
Answer(s): A,D
Functional zones (e.g., junos-host, management, null) are not used for forwarding transit traffic. They are used to manage traffic destined to or from the SRX device itself.Option A: Correct. If traffic enters through a functional zone interface, it is meant for the SRX, not for transit, so it cannot exit another interface.Option D: Correct. Transit interfaces handle forwarding traffic, but they cannot send that traffic out through a functional zone interface.Option B and C: Incorrect, because functional zones are strictly control-plane, not transit forwarding zones.Correct Statements: A and D
Juniper Networks – Security Zones vs. Functional Zones, Junos OS Security Fundamentals.
Which two statements are correct about NAT and security policy processing? (Choose two.)
Answer(s): B,D
The packet processing order in SRX with NAT and policies is:Destination NAT (applies first, for inbound traffic).Security Policy Evaluation (after destination NAT, before source NAT).Source NAT (applies last, for outbound traffic).Option A: Incorrect. Policies are not evaluated before destination NAT.Option B: Correct. Security policies are evaluated before source NAT but after destination NAT. So in terms of order, policies are processed prior to source NAT.Option C: Incorrect. Policies are not evaluated before source NAT — they are evaluated before source NAT is applied.Option D: Correct. Policies are evaluated after destination NAT.Correct Statements: B and D
Juniper Networks – Packet Flow Processing Order (NAT and Policies), Junos OS Security Fundamentals.
Which statement is correct about capturing transit packets on an SRX Series Firewall?
Answer(s): D
Transit traffic is defined as traffic that passes through the 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
Juniper Networks – Traffic Monitoring and Troubleshooting, Junos OS Security Fundamentals.
You have created a series of security policies permitting access to a variety of services. You now want to create a policy that blocks access to all other services for all user groups.What should you create in this scenario?
Answer(s): A
To enforce a catch-all blocking policy after other specific policies, the correct solution is a global security policy (Option A).Global policies can apply universally across zones, and an administrator can configure a final “deny all” rule to block any unmatched traffic.ATP policy (Option B): Protects against advanced threats, not used for catch-all rule enforcement.IDP policy (Option C): Focuses on intrusion detection and prevention signatures, not general traffic blocking.Integrated user firewall policy (Option D): Applies policies based on user identity, but it does not provide a universal block across all services.Correct Solution: Global security policy
Juniper Networks – Global Security Policies, Junos OS Security Fundamentals.
You are asked to enable trace options to debug the packet flow.In this scenario, which flag would you configure at the [edit security flow traceoptions] hierarchy?
Traceoptions in the security flow hierarchy provide debugging for how packets are processed in the flow module.The correct flag to capture detailed packet-level debugging is packet-dump (Option A). This outputs packet-level trace messages showing flow decisions, NAT processing, and policy matches.general (Option B): Provides basic flow trace information but not full packet inspection.state (Option C): Tracks flow state transitions, less detailed than packet-dump.basic-datapath (Option D): Provides high-level datapath debugging, not detailed flow troubleshooting.Correct Flag: packet-dump
Juniper Networks – Security Flow Traceoptions, Junos OS Security Fundamentals.
Which two security policies are installed by default on SRX 300 Series Firewalls? (Choose two.)
By default, SRX 300 Series Firewalls come with predefined security policies:Trust-to-Untrust (Option B): A default policy exists to permit all traffic from the trust zone to the untrust zone.Trust-to-Trust (Option D): Intra-zone traffic is permitted by default; hence, a trust-to-trust policy is installed automatically.Untrust-to-Trust (Option A): Not allowed by default, since external traffic must be explicitly permitted by an administrator.Management-to-Trust (Option C): No such default policy exists.Correct Policies: Trust-to-Untrust and Trust-to-Trust
Juniper Networks – Default Security Policies and Intra-zone Rules, Junos OS Security Fundamentals.
Which two statements are true about the NextGen Web Filtering (NGWF) feature on an SRX Series device? (Choose two.)
Answer(s): B,C
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 checks local 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.
Juniper Networks – UTM Web Filtering Types (NextGen Web Filtering), Junos OS Security Fundamentals.
When a new traffic flow enters an SRX Series device, in which order are these processes performed?
Answer(s): B
The packet flow for new traffic on SRX is processed in a defined order:Screens (Option B, Step 1): Packets are first checked by screens for anomalies such as floods, malformed packets, or protocol violations.Route Lookup (Step 2): The destination IP is checked in the routing table to determine the egress interface.Zone Determination (Step 3): Once the ingress and egress interfaces are known, their associated zones are identified.Security Policies (Step 4): With both zones determined, the packet is evaluated against the configured security policies.Other options list incorrect sequences, either moving routing later or placing policies before zone determination, which is not possible.Correct Processing Order: screens →routes →zones →security policies
Juniper Networks – Packet Flow and Security Processing Order, Junos OS Security Fundamentals.
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