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Juniper JN0-637 Exam Syllabus Topics:

Topic	Details
Topic 1	Advanced Network Address Translation (NAT): This section evaluates networking professionals' expertise in advanced NAT functionalities and their ability to manage complex NAT scenarios.
Topic 2	Troubleshooting Security Policies and Security Zones: This topic assesses the skills of networking professionals in troubleshooting and monitoring security policies and zones using tools like logging and tracing.
Topic 3	Multinode High Availability (HA): In this topic, aspiring networking professionals get knowledge about multinode HA concepts. To pass the exam, candidates must learn to configure or monitor HA systems.
Topic 4	Layer 2 Security: It covers Layer 2 Security concepts and requires candidates to configure or monitor related scenarios.

Juniper Security, Professional (JNCIP-SEC) Sample Questions (Q111-Q116):

NEW QUESTION # 111
Exhibit:

Referring to the flow logs exhibit, which two statements are correct? (Choose two.)

A. The packet is dropped by the default security policy.
B. The data shown requires a traceoptions flag of host-traffic.
C. The packet is dropped by a configured security policy.
D. The data shown requires a traceoptions flag of basic-datapath.

Answer: A,D

Explanation:
* Understanding the Flow Log Output:
From the flow logs in the exhibit, we can observe the following key events:
* The session creation was initiated (flow_first_create_session), but the policy searchfailed (flow_first_policy_search), which implies that no matching policy was found between the zones involved (zone trust-> zone dmz).
* The packet was dropped with the reason "denied by policy." This shows that the packet was dropped either due to no matching security policy or because the default policy denies the traffic (packet dropped, denied by policy).
* The line denied by policy default-policy-logical-system-00(2) indicates that the default security policy is responsible for denying the traffic, confirming that no explicit security policy was configured to allow this traffic.
* Explanation of Answer A (Dropped by the default security policy):
The log message clearly states that the packet was dropped by the default security policy (default-policy- logical-system-00). In Junos, when a session is attempted between two zones and no explicit policy exists to allow the traffic, the default policy is to deny the traffic. This is a common behavior in Junos OS when a security policy does not explicitly allow traffic between zones.
* Explanation of Answer D (Requires traceoptions flag of basic-datapath):
The information displayed in the log involves session creation, flow policy search, and packet dropping due to policy violations, which are all part of basic packet processing in the data path. This type of information is logged when the traceoptions flag is set tobasic-datapath. The basic-datapath traceoption provides detailed information about the forwarding process, including policy lookups and packet drops, which is precisely what we see in the exhibit.
* The traceoptions flaghost-traffic(Answer C) is incorrect because host-traffic is typically used for traffic destined to or generated from the Junos device itself (e.g., SSH or SNMP traffic to the SRX device), not for traffic passing through the device.
* To capture flow processing details like those shown, you need the basic-datapath traceoptions flag, which provides details about packet forwarding and policy evaluation.
Step-by-Step Configuration for Tracing (Basic-Datapath):
* Enable flow traceoptions:
To capture detailed information about how traffic is being processed, including policy lookups and flow session creation, enable traceoptions for the flow.
bash
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set security flow traceoptions file flow-log
set security flow traceoptions flag basic-datapath
* Apply the configuration and commit:
bash
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commit
* View the logs:
Once enabled, you can check the trace logs for packet flows, policy lookups, and session creation details:
bash
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show log flow-log
This log will contain information similar to the exhibit, including session creation attempts and packet drops due to security policy.
Juniper Security Reference:
* Default Security Policies: Juniper SRX devices have a default security policy to deny all traffic that is not explicitly allowed by user-defined policies. This is essential for security best practices. Reference:
Juniper Networks Documentation on Security Policies.
* Traceoptions for Debugging Flows: Using traceoptions is crucial for debugging and understanding how traffic is handled by the SRX, particularly when issues arise from policy misconfigurations or routing. Reference: Juniper Traceoptions.
By using the basic-datapath traceoptions, you can gain insights into how the device processes traffic, including policy lookups, route lookups, and packet drops, as demonstrated in the exhibit.

NEW QUESTION # 112
Which two statements describe the behavior of logical systems? (Choose two.)

A. Each logical system shares the routing protocol process.
B. Each logical system has a copy of the routing protocol process.
C. A default routing instance is automatically created for each logical system.
D. A default routing instance must be manually created for each logical system

Answer: B,C

NEW QUESTION # 113
Exhibit.

Referring to the exhibit, which two statements are true? (Choose two.)

A. The custom infected hosts feed will not overwrite the Sky ATP infected host's feed.
B. Juniper Networks will investigate false positives generated by this custom feed.
C. The custom infected hosts feed will overwrite the Sky ATP infected host's feed.
D. Juniper Networks will not investigate false positives generated by this custom feed.

Answer: A,D

Explanation:
Juniper Networks will not investigate false positives generated by this custom feed. - Typically, a vendor like Juniper Networks would not investigate false positives generated by a custom feed because the feed content is controlled by the customer, not Juniper.
The custom infected hosts feed will not overwrite the Sky ATP infected host's feed. - Custom feeds are generally additional to the feeds provided by a vendor's threat intelligence platform like Sky ATP. They are used to supplement the existing threat intelligence and do not overwrite it, but rather work alongside it.

NEW QUESTION # 114
Exhibit

Referring to the exhibit, an internal host is sending traffic to an Internet host using the 203.0.113.1 reflexive address with source port 54311.
Which statement is correct in this situation?

A. Only the Internet host that the internal host originally communicated with can initiate traffic to reach the internal host using the 203.0.113.1 address, source port 54311, and a random destination port.
B. Any host on the Internet can initiate traffic to reach the internal host using the 203.0.113.1 address, a random source port, and destination port54311.
C. Only the Internet host that the internal host originally communicated with can initiate traffic to reach the internal host using the 203.0 113.1 address, a random source port, and destination port 54311.
D. Any host on the Internet can initiate traffic to reach the internal host using the 203.0.113.1 address, source port 54311, and a random destination port.

Answer: D

NEW QUESTION # 115
You have deployed two SRX Series devices in an active/passive multimode HA scenario.
In this scenario, which two statements are correct? (Choose two.)

A. Services redundancy group 1 (SRG1) is used for services that have a control plane state.
B. Services redundancy group 0 (SRG0) is used for services that have a control plane state.
C. Services redundancy group 1 (SRG1) is used for services that do not have a control plane state.
D. Services redundancy group 0 (SRG0) is used for services that do not have a control plane state.

Answer: A,D

Explanation:
Explanation:

NEW QUESTION # 116
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