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| Section | Objectives |
|---|---|
| Juniper SRX Platform Basics | - Junos security architecture
|
| Security Services and Monitoring | - Security services overview
|
| VPN and Secure Connectivity | - IPsec VPN fundamentals
|
| Security Fundamentals | - Network security concepts
|
| Security Policies and NAT | - Policy configuration
|
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NEW QUESTION # 58
Click the Exhibit button.
Referring to the exhibit, which two statements are correct about the traffic flow shown in the exhibit? (Choose two.)
Answer: B,C
Explanation:
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:
The source IP (10.20.30.40) was translated to 192.0.2.1. This indicates Source NAT was applied → Option B is correct.
The destination IP changed between the inbound and outbound view. Inbound it was 203.0.113.1, and outbound it is still 203.0.113.1 in appearance, but notice the reversal: the session entry shows it as the outbound "source" side. This confirms Destination NAT translation has occurred for 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.
NEW QUESTION # 59
What is a purpose for creating multiple routing instances on an SRX Series Firewall device?
Answer: C
Explanation:
Multiple routing instances are used to isolate and separate routing tables, enabling logical segmentation of traffic for security and traffic separation purposes on the SRX Series Firewall.
NEW QUESTION # 60
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.)
Answer: B,D
Explanation:
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
NEW QUESTION # 61
What is the default timeout value for TCP sessions on an SRX Series device?
Answer: C
Explanation:
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.
NEW QUESTION # 62
What are two system-defined zones created on the SRX Series Firewalls? (Choose two.)
Answer: A,C
Explanation:
On SRX Series Firewalls, Junos OS automatically creates system-defined zones that have special functions:
Null zone (Option A): A predefined discard zone. By default, all interfaces belong to the null zone until assigned to a user-defined zone. Traffic destined to the null zone is dropped.
Junos-host zone (Option B): A predefined functional zone that allows security policies to control traffic directed to the SRX device itself (management traffic, such as SSH, HTTP, SNMP).
Management zone (Option C): There is a predefined management functional zone, but it is not called "management" as a system-defined security zone.
DMZ (Option D): A DMZ zone must be explicitly created by the administrator, it is not system-defined.
Correct Zones: null, junos-host
NEW QUESTION # 63
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