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| Section | Weight | Objectives |
|---|---|---|
| Junos OS Security Objects | 20% | - Security zones - Address objects and address sets - Application objects and ALGs - Screens and security profiles |
| Content Security | 15% | - Web filtering - Antivirus protection - Antispam filtering - Content filtering |
| Monitoring, Reporting and Troubleshooting | 10% | - Troubleshooting common issues - Security policy monitoring - Log and event management - Traffic flow verification |
| Security Policies | 20% | - Policy rules and actions - Unified security policies - Zone-based policies - Global policies |
| Network Address Translation | 15% | - Source NAT - Static NAT - Destination NAT - NAT pools and rules |
| SRX Series Service Gateways | 20% | - Traffic flow and security processing - Hardware components - Interfaces - Juniper vSRX Virtual Firewall - General Junos architecture - Initial configuration - J-Web management interface |
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97. Frage
Your manager asks you to ping 192.0.2.128. The ping fails and you do not know why, so you enable a trace option on your SRX Series Firewall.
Referring to the exhibit, what is the reason for this behavior?
Antwort: B
Begründung:
The trace output shows the message "packet dropped, drop by firewall check" followed by "flow find session returns error", which indicates that the SRX could not find a valid route (RIB lookup failed) for the destination IP 192.0.2.128. When no route exists to the destination, the SRX drops the packet before creating a session. Therefore, the ping fails due to the absence of a known route.
98. Frage
Click the Exhibit button.
The exhibit shows a table representing security policies from the trust zone to the untrust zone.
In this scenario, which two statements are correct? (Choose two.)
Antwort: B,D
Begründung:
Juniper SRX evaluates security policies sequentially from top to bottom. Once a policy match is found, no further policies are evaluated. In this exhibit:
First Policy (FTP, deny):
Source: 172.25.11.0/24
Destination: 10.1.0.0/16
Application: FTP
Action: deny
⇒ Any FTP traffic from 172.25.11.0/24 to 10.1.0.0/16 is denied.
Second Policy (SSH, permit):
Same source/destination but application = SSH
Action = permit
⇒ SSH traffic from 172.25.11.0/24 to 10.1.0.0/16 is permitted.
Third Policy (HTTPS, permit):
⇒ HTTPS from the same source/destination is permitted.
Fourth Policy (Ping, permit):
Source: 172.25.11.0/24 to any destination
Application: ping
Action: permit
⇒ ICMP echo requests (ping) from 172.25.11.0/24 to any destination are permitted.
Fifth Policy (any → any, deny):
⇒ Serves as a default deny all at the end.
Now checking each option:
Option A: SSH from 172.25.11.10 → 10.1.0.10 matches the SSH permit rule (second policy). ✅ Correct.
Option B: Ping from 172.25.11.100 → 10.1.0.10 matches the ping permit rule (fourth policy). This traffic is permitted, not denied. ❌ Incorrect.
Option C: FTP from 10.1.0.10 → 172.25.11.100 is reverse traffic (untrust to trust). The table applies only trust → untrust, so this policy does not apply. ❌ Incorrect.
Option D: FTP from 172.25.11.11 → 10.1.0.10 matches the first policy (FTP deny rule). ✅ Correct.
Correct Statements: A, D
99. Frage
Which statement is correct about static NAT?
Antwort: D
Begründung:
Static NAT (Network Address Translation) is a type of NAT that maps a public IP address to a private IP address. With static NAT, a one-to-one mapping is created between a public IP address and a private IP address. This means that a single public IP address is mapped to a single private IP address, and all incoming traffic to the public IP address is forwarded to the private IP address.
100. Frage
You have a situation where legitimate traffic is incorrectly identified as malicious by your screen options.
In this scenario, what should you do?
Antwort: A
Begründung:
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.
101. Frage
Referring to the exhibit, which type of NAT is the SRX Series Firewall performing?
Antwort: D
Begründung:
The session shows the internal host 10.10.101.140 translated to the public address
203.0.113.199 with its source port changed from 53726 to 21421, indicating source NAT with Port Address Translation (PAT).
102. Frage
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