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| Section | Objectives |
|---|---|
| Network Address Translation | - Destination NAT - Static NAT - Source NAT |
| Content Security | - Antispam - Content filtering - Antivirus - Web filtering |
| Junos OS Security Objects | - Addresses - Applications and Application Layer Gateways (ALGs) - Zones - Screens |
| Monitoring and Troubleshooting | - Troubleshooting security policies - Monitoring the packet flow process - Validating behaviors |
| Security Policies | - Global policies - Zone-based policies - Unified security policies |
| SRX Series Service Gateways | - Interfaces - Initial configuration - J-Web - General Junos architecture - Traffic flow/security processing - Juniper vSRX Virtual Firewall - Hardware |
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질문 # 62
Which two statements are correct about unified security policies? (Choose two.)
정답：B,C
설명：
Unified security policies (USPs) provide integrated application-aware controls usingAppIDand extend traditional zone-based policy enforcement.
* Option A:Correct. If traffic matches a unified security policy, it is not re-evaluated by traditional security policies. Unified policies take precedence for matched flows.
* Option B:Incorrect. Traditional policies rely on Layer 3/4 attributes. Unified policies go deeper by leveraging AppID, which inspects traffic up to Layer 7.
* Option C:Incorrect. Traffic matching a traditional policy is unaffected by unified policy unless unified mode is explicitly configured for those flows.
* Option D:Correct. Dynamic application recognition in unified policies usesLayer 7 (application- layer) inspectionvia AppID.
Correct Statements:A and D
Reference:Juniper Networks -Unified Security Policies and AppSecure AppID, Junos OS Security Fundamentals.
질문 # 63
You need to capture control plane traffic on a high-end SRX Series device.
How would you accomplish this task?
정답：D
설명：
On high-end SRX platforms, control-plane (Routing Engine-destined) traffic transits the loopback (lo0) and is best captured by applying afirewall filter on lo0 with the then sample action, together withtraffic samplingunder forwarding-options to write packets to a file.
* sample sends matched control-plane packets to the sampling process, which can record them for analysis.
* datapath-debug capture focuses on data-plane/SPC paths and is not the tool for generic control-plane packet capture.
* tcpdump from shell is not the supported workflow on SRX; the operational command is monitor traffic, but forhigh-endcontrol-plane capture, the recommended and scalable method islo0 filter + sampling.
* Port mirroring mirrors transit data-plane traffic, not RE-destined control-plane packets.
Reference:Juniper Networks - Junos OS Security Fundamentals, "Capturing Control-Plane Traffic (lo0 filters and sampling)."
질문 # 64
Which security policy action will cause traffic to drop and a message to be sent to the source?
정답：D
설명：
Security policies on SRX support several actions:
Permit: Allows traffic to pass according to the rule.
Deny: Silently drops the traffic without notifying the source.
Reject: Drops the traffic and sends a TCP RST (for TCP) or ICMP unreachable (for UDP/other protocols) back to the source. This provides feedback to the sending host.
Next-policy: Allows policy chaining to evaluate the next policy set.
Therefore, the action that causes traffic to drop and a message to be sent to the source is reject.
질문 # 65
When does screening occur in the flow module?
정답：B
설명：
In Juniper SRX flow-based packet processing, theflow moduleis responsible for security functions such as screening, session management, NAT, and policy enforcement. The processing order is critical:
* Screens are applied before any session lookup.This ensures that packets are inspected for anomalies, floods, or protocol violations before consuming resources for session management. Examples of these screens include TCP SYN flood protection, ICMP flood protection, and port scanning protection.
* After screening, thesession lookupoccurs. At this point, the firewall checks whether the packet belongs to an existing session in the session table. If a matching session is found, the packet bypasses policy evaluation and is forwarded according to the session state.
* If no existing session is found, the packet continues throughroute lookup, NAT processing, and security policy evaluationbefore a new session is created.
Thus,screening occurs before the session lookup, protecting the system early in the flow process. This design ensures efficiency by dropping malicious or malformed traffic before allocating session resources.
Reference:Juniper Networks -SRX Series Services Gateways Security Processing (Flow Module Sequence), Junos OS Security Fundamentals, Official Course Guide.
질문 # 66
What is the default timeout value for TCP sessions on an SRX Series device?
정답：B
설명：
By default, TCP has a 30-minute idle timeout, and UDP has a 60-second idle timeout.
Additionally, known IP protocols have a 30-minute timeout, whereas unknown ones have a 60- second timeout. Setting the inactivity timeout is very useful, particularly if you are concerned about applications either timing out or remaining idle for too long and filling up the session table.
According to the Juniper SRX Series Services Guide, this can be configured using the 'timeout inactive' statement for the security policy.
질문 # 67
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