View Full Juniper JN0-336 Exam Dumps and Practice Test Dumps

 

Question 81.

Which security policy criterion identifies the initiating zone?

1. Source zone
2. Destination address
3. Application service
4. Policy schedule

Correct Answer: 1

Explanation:

The source zone identifies where the initiating traffic originates within an SRX security policy. Security policies commonly evaluate traffic using source zone, destination zone, source and destination addresses, applications, services, and other criteria. The source zone is particularly important because policies are evaluated between security zones, allowing administrators to control traffic flows from one trust boundary to another. Destination addresses and applications further narrow the match, while schedules can restrict when a policy is active. Correctly defining the source zone helps ensure that the intended traffic path is evaluated against the appropriate security policy.

Question 82.

What does a custom attack signature provide?

1. Automatic route selection
2. Tailored threat detection
3. VPN tunnel addressing
4. User authentication

Correct Answer: 2

Explanation:

A custom attack signature allows administrators to define detection logic for traffic patterns that may not be covered adequately by predefined IDP signatures. This capability is useful when an organization encounters a proprietary application, unusual protocol behavior, or a newly identified attack pattern requiring specialized inspection. The signature can specify matching characteristics and associated actions according to the configured IDP framework. Automatic routing, VPN addressing, and user authentication serve different networking or security functions. Custom signatures therefore extend intrusion detection capabilities by allowing administrators to address organization-specific threats and traffic behaviors.

Question 83.

Which processing mode evaluates traffic after session establishment?

1. Packet mode
2. Interface mode
3. Flow mode
4. Tunnel mode

Correct Answer: 3

Explanation:

Flow-based processing evaluates packets in the context of a session, allowing the SRX device to maintain state information as traffic traverses the firewall. Once a session is established, subsequent packets can be processed according to the session state and associated security policies. This approach provides stateful inspection and supports efficient handling of established connections. Packet mode refers to individual packet processing rather than the same session-oriented model. Interface and tunnel modes describe other configuration concepts rather than the relevant security-processing model. Understanding flow processing is important when analyzing SRX traffic behavior and firewall session handling.

Question 84.

Which feature can answer ARP requests for translated addresses?

1. Destination NAT
2. Source NAT
3. Static routing
4. Proxy ARP

Correct Answer: 4

Explanation:

Proxy ARP allows an SRX device to respond to ARP requests on behalf of another address, which can be useful when NAT mappings require the firewall to represent translated addresses on a local network segment. When a host searches for the MAC address associated with a translated destination, the SRX can answer using proxy ARP and then process the resulting traffic according to its NAT and security configuration. Destination NAT performs address translation but does not itself describe the ARP response mechanism. Proxy ARP therefore helps integrate certain NAT deployments with Layer 2 address-resolution behavior.

Question 85.

Which NAT feature keeps mappings consistent for repeated connections?

1. Persistent NAT
2. Static route
3. Security screen
4. IDP detector

Correct Answer: 1

Explanation:

Persistent NAT is designed to maintain consistent address and port mappings for traffic associated with a particular client, depending on the configured persistent NAT behavior. This can be useful for applications that expect repeated connections from the same internal endpoint to maintain a predictable translated identity. Standard dynamic NAT may create mappings according to available resources and configured rules, while persistent behavior provides additional mapping stability. Static routing, security screens, and IDP detectors address routing or security inspection functions instead. Persistent NAT is therefore relevant when applications depend on predictable translation relationships.

Question 86.

What identifies the outgoing interface for a route-based VPN?

1. Security policy
2. Routing table
3. IDP signature
4. User role

Correct Answer: 2

Explanation:

The routing table determines the forwarding path for traffic entering a route-based VPN environment. In Junos, a route-based VPN commonly uses a secure tunnel interface such as st0, and routes determine which destinations should be forwarded through that interface. The security policy still controls whether traffic is permitted between zones, but it does not replace the routing decision. IDP signatures and user roles serve security inspection or identity functions. Understanding the relationship between routing and tunnel interfaces is essential for troubleshooting route-based VPN connectivity and verifying that traffic follows the intended encrypted path.

Question 87.

Which IKE authentication method uses a shared secret?

1. Certificate authentication
2. EAP authentication
3. Pre-shared key
4. Token authentication

Correct Answer: 3

Explanation:

Pre-shared-key authentication uses a secret value configured on both VPN peers to authenticate the IKE negotiation. The participating devices must possess matching credentials for authentication to succeed. This method is commonly used in site-to-site VPN deployments because it does not require a certificate infrastructure. Certificate authentication instead relies on digital certificates and associated trust relationships. EAP provides a framework for certain authentication exchanges, while token authentication involves other credential mechanisms. Correctly configuring the same pre-shared key on both peers is essential for successful IKE authentication and VPN establishment.

Question 88.

What does certificate-based IKE authentication depend on?

1. Matching VLAN tags
2. Trusted certificates
3. NAT pool size
4. IDP policies

Correct Answer: 4

Explanation:

Certificate-based IKE authentication relies on digital certificates and the trust relationships established between the participating VPN peers. Each device validates the presented certificate according to configured trust anchors, certificate properties, and authentication requirements. This approach can provide scalable identity verification without manually distributing a shared secret to every peer. VLAN configuration and NAT pool sizing do not provide certificate authentication. IDP policies inspect traffic for intrusion-related patterns rather than authenticating IKE peers. Proper certificate enrollment, trust configuration, and validity checking are therefore important when deploying certificate-based VPN authentication.

Question 89.

Which mechanism can verify VPN reachability continuously?

1. RPM probing
2. ARP aging
3. IDP matching
4. Policy scheduling

Correct Answer: 1

Explanation:

Real-time Performance Monitoring, or RPM, can use active probes to test reachability and measure network performance characteristics. In VPN environments, RPM probes can help determine whether a remote endpoint remains reachable through the expected path. This information can support monitoring and operational decisions when tunnel connectivity changes. ARP aging manages Layer 2 neighbor information, while IDP matching concerns intrusion detection and policy scheduling determines when policies are active. RPM is therefore useful for continuous operational visibility into remote network reachability and can help administrators detect connectivity problems affecting VPN services.

Question 90.

What does IPsec anti-replay protection detect?

1. Invalid certificates
2. Duplicate packets
3. Expired routes
4. Incorrect DNS

Correct Answer: 2

Explanation:

IPsec anti-replay protection helps detect packets that appear to have been captured and resent, commonly called replay attacks. IPsec uses sequence numbers and a replay window to determine whether incoming packets are acceptable based on their sequence position. Packets falling outside the permitted window or repeating previously accepted sequence numbers can be rejected. Certificate validation handles peer authentication, routing determines forwarding paths, and DNS resolves names. Anti-replay protection therefore contributes to VPN security by preventing attackers from successfully reusing captured encrypted traffic against an IPsec-protected connection.

Question 91.

What usually triggers an IPsec security association rekey?

1. New security zone
2. Changed hostname
3. Lifetime expiration
4. Modified DNS record

Correct Answer: 3

Explanation:

An IPsec security association can be rekeyed when its configured lifetime expires. During rekeying, the VPN peers establish fresh cryptographic parameters and create a new security association before the existing association becomes unusable. Lifetimes can be based on time, traffic volume, or other configured parameters depending on the VPN implementation and configuration. Rekeying limits the amount of traffic protected by one set of cryptographic keys and supports continued secure communication. Security zones, hostnames, and DNS records do not normally determine when an IPsec security association reaches its configured rekey threshold.

Question 92.

Which counter helps determine whether a security policy is being matched?

1. Route metric
2. Policy hit count
3. ARP timer
4. Tunnel MTU

Correct Answer: 4

Explanation:

Security policy hit information can help administrators determine whether traffic is matching and using a particular firewall policy. When troubleshooting policy behavior, examining policy counters can reveal whether sessions or packets are reaching the expected rule. If the counter remains unchanged while matching traffic is generated, the administrator may need to investigate zones, addresses, applications, services, or policy ordering. Route metrics affect path selection, ARP timers control neighbor-cache behavior, and tunnel MTU concerns packet sizing. Policy hit information is therefore a useful operational indicator when validating firewall-policy behavior.

Question 93.

Which Junos feature helps trace security policy processing?

1. Policy traceoptions
2. DNS forwarding
3. Interface monitoring
4. Route preference

Correct Answer: 1

Explanation:

Policy traceoptions can provide detailed diagnostic information about security policy processing and matching behavior. Administrators can use tracing when normal session or policy counters do not provide enough detail to understand why traffic is being accepted, rejected, or matched against an unexpected rule. Trace output can help identify policy evaluation details and related processing information. DNS forwarding serves name-resolution functions, interface monitoring checks interface conditions, and route preference influences route selection. Because traceoptions provide deeper diagnostic visibility, they are valuable when troubleshooting complex security-policy behavior on SRX devices.

Question 94.

What indicates that a Security Director policy deployment completed?

1. DNS resolution
2. Deployment status
3. Interface speed
4. Session timeout

Correct Answer: 2

Explanation:

Security Director provides deployment status information that allows administrators to determine whether policy changes have been successfully pushed to managed devices. Reviewing deployment status can reveal whether an operation completed successfully or encountered errors requiring additional investigation. This is especially important when centralized policy changes appear in the management system but are not yet reflected on the target SRX device. DNS resolution, interface speed, and session timeout are unrelated to centralized policy deployment status. Checking deployment results helps confirm that the intended configuration has progressed through the management workflow.

Question 95.

What does a Junos commit validation check?

1. Configuration consistency
2. Packet encryption
3. User identity
4. Malware reputation

Correct Answer: 3

Explanation:

Junos configuration validation checks whether the candidate configuration is syntactically and structurally acceptable before it is committed as the active configuration. Validation can identify configuration problems that could prevent a successful commit or cause unintended behavior. This process does not encrypt packets, verify end-user identities, or determine malware reputation. Those functions belong to other security or networking mechanisms. Administrators commonly validate configuration changes before committing them, especially when modifying security policies, routing, VPN settings, or interfaces. Configuration validation therefore provides an important safeguard during operational changes.

Question 96.

Which UTM capability combines multiple security inspections?

1. Route aggregation
2. Address translation
3. Service chaining
4. Interface bonding

Correct Answer: 4

Explanation:

UTM service chaining allows multiple security services to be applied as part of a broader traffic-inspection workflow. Depending on the configured platform and services, traffic can be subjected to functions such as antivirus, antispam, web filtering, or related content-security checks. Route aggregation combines routing information, address translation changes network addressing, and interface bonding concerns link aggregation. The purpose of service chaining is to coordinate security inspection functions rather than networking operations. Understanding how UTM services are associated with policies helps administrators verify that intended content-security controls are actually being applied.

Question 97.

Which web-filtering action blocks a prohibited category?

1. Permit
2. Log
3. Block
4. Redirect

Correct Answer: 1

Explanation:

A block action prevents access to web content that matches the configured prohibited category or filtering condition. Web filtering can classify requested destinations and apply actions according to administrative policy. Depending on the configuration, other actions may permit traffic, generate logging information, or redirect users. A blocking action directly enforces the restriction by preventing the matching request from proceeding normally. Administrators can use category-based policies to control access to different types of websites while maintaining broader access to permitted content. The exact behavior depends on the configured web-filtering profile and associated security policy.

Question 98.

What can limit antivirus inspection of very large files?

1. File-size threshold
2. Route preference
3. DNS timeout
4. VPN lifetime

Correct Answer: 2

Explanation:

Antivirus inspection can use configured file-size limits to control which files are scanned. Very large files may require significant processing resources, so inspection profiles can impose thresholds that determine whether a file is eligible for scanning. This helps administrators balance malware detection requirements with device performance and resource usage. Route preference determines routing choices, DNS timeout affects name-resolution behavior, and VPN lifetime governs security-association timing. File-size thresholds therefore belong to content-inspection configuration and can be important when designing antivirus policies for environments where large downloads or file transfers are common.

Question 99.

Which antispam factor can evaluate sender reputation?

1. Tunnel identifier
2. Route protocol
3. Reputation data
4. VLAN priority

Correct Answer: 3

Explanation:

Sender reputation data can contribute to antispam decisions by providing information about the historical trustworthiness or reputation associated with an email source. Antispam systems can use reputation-related intelligence together with other inspection criteria to identify potentially unwanted messages. Tunnel identifiers and routing protocols concern network connectivity, while VLAN priority concerns traffic handling within a Layer 2 environment. Reputation information is therefore relevant to email-security classification rather than routing or VPN configuration. Administrators should understand how reputation-based checks interact with other antispam controls when tuning email protection policies.

Question 100.

Which logging setting controls message importance?

1. Source address
2. Session timeout
3. Application group
4. Syslog severity

Correct Answer: 4

Explanation:

Syslog severity determines the importance level assigned to a system or security message and helps control how events are categorized for logging and monitoring purposes. Severity levels allow administrators to distinguish informational events from warnings, errors, or more serious conditions. Source addresses identify traffic endpoints, session timeouts control connection lifetime, and application groups organize application identification information. Proper severity configuration can help reduce unnecessary log noise while ensuring important events receive appropriate attention. Understanding severity levels is particularly useful when integrating SRX logs with centralized monitoring or security-information platforms.