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| Section | Objectives |
|---|---|
| Intrusion Detection and Prevention (IDP) | - IDP concepts and architecture
|
| High Availability (HA) Clustering | - Chassis cluster operations
|
| Security Director (Junos Space) | - Management platform
|
| Juniper Advanced Threat Prevention (ATP) Cloud | - Operations
|
| SSL Proxy | - SSL inspection concepts
|
| Identity-Aware Security Policies | - Identity concepts
|
| IPsec VPN | - IPsec fundamentals and deployment
|
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質問 # 49
Which action will the SRX Series device take if traffic matches the custom attack object shown in the exhibit?
正解：A
解説：
The correct answer is A. the action taken is defined in the IDP policy that includes this attack object. The exhibit defines a custom attack object named BGP-DEFEND under the security idp custom-attack hierarchy.
The custom object includes metadata such as recommended-action drop, severity critical, and signature match conditions such as BGP update AS-path context and pattern 65501. However, an attack object by itself does not determine the final enforcement behavior. The attack object defines what to match; the IDP policy rule that references the object defines what action to take when that match occurs. Juniper describes attack objects as objects used inside IDP rules to identify malicious activity, while IDP rules include rule actions such as drop-packet, drop-connection, close-client, close-server, recommended, and others.
Option B is wrong because the firewall security policy enables IDP inspection by applying an IDP policy, but the IDP action is not selected directly by the normal security policy. Options C and D are too absolute. Even though the custom object shows recommended-action drop, that is only used if the IDP rule action invokes recommended behavior. Without seeing the IDP policy rule action, you cannot conclude reject or drop.
Reference topics: IDP custom attack objects, IDP policy rule actions, recommended action, signature-based attack matching.
質問 # 50
You are asked to create an IPS-exempt rule base to eliminate false positives from happening.
Which two configuration parameters are available to exclude traffic from being examined? (Choose two.)
正解：B、D
解説：
You can specify the source IP address or a range of IP addresses to exclude certain traffic originating from specific network segments or devices. This is useful for whitelisting traffic from known, secure sources that are otherwise triggering false positives in the IPS system.
Similarly, you can specify the destination IP address or a range of addresses to exclude traffic destined for particular network hosts or segments. This helps in reducing false positives for traffic directed towards trusted internal resources or specific external services that are known to be safe.
質問 # 51
You are asked to block malicious applications regardless of the port number being used.
In this scenario, which two application security features should be used? (Choose two.)
正解：A、C
質問 # 52
Which three algorithms are used to encrypt IP packets? (Choose three.)
正解：A、B、D
解説：
The correct answers are A, D, and E. In IPsec VPN terminology, DES, 3DES, and AES are encryption algorithms used to provide confidentiality for protected IP traffic. Juniper's IPsec material identifies AES, DES, and Triple DES/3DES as IPsec encryption standards, while separating them from authentication hash algorithms such as MD5, SHA-1, and SHA-2. This distinction matters heavily in JNCIS-SEC because IPsec proposals contain different cryptographic functions: encryption protects packet confidentiality, while authentication/hash algorithms validate integrity and origin.
Option B, SHA-1, is incorrect because SHA-1 is a hashing/authentication algorithm, not an encryption algorithm. It produces a message digest used for integrity checking and authentication, commonly as an HMAC variant. Option C, MD5, is also incorrect for the same reason: MD5 is a message-digest algorithm used for authentication/integrity, not for encrypting payload data. AES is the modern preferred encryption family because it is cryptographically stronger than DES and 3DES at comparable key strengths, while DES and 3DES remain historically recognized IPsec encryption algorithms. Reference topics: IPsec VPN, IPsec proposals, encryption algorithms, authentication algorithms, DES, 3DES, AES, SHA, and MD5.
質問 # 53
Which two functions does Juniper ATP Cloud perform to reduce delays in the inspection of files? (Choose two.)
正解：A、D
解説：
The correct answers are A and D. Juniper ATP Cloud reduces inspection delay in two practical ways: trusted allowlists and cache lookup. An allowlist contains known trusted IP addresses, hashes, email addresses, and URLs; Juniper states that content downloaded from locations on the allowlist does not have to be inspected for malware. That eliminates unnecessary cloud-analysis cycles for known trusted sources or objects.
Option D is also correct because ATP Cloud performs a real-time cache lookup before deeper analysis.
Juniper explains that when a file is uploaded, ATP Cloud first checks whether the file has been analyzed before; if it has, the stored verdict is returned to the SRX Series Firewall and there is no need to re-analyze the file. This directly reduces inspection delay and enables faster enforcement. Option B is wrong because ATP Cloud does not rely on a single antivirus engine; it uses a pipeline that can include cache lookup, antivirus, static analysis, dynamic analysis, and machine learning. Option C is wrong because inspection bypass is not delegated to end users. Reference topics: ATP Cloud, allowlists, file inspection workflow, cache lookup, malware analysis pipeline.
質問 # 54
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