View Full Juniper JN0-664 Exam Dumps and Practice Test Dumps.

 

Question 381

Which Junos command reveals routes suppressed from active selection?

1. show route hidden
2. show route terse
3. show route summary
4. show route protocol

Correct Answer: 1

Explanation:

The show route hidden command displays routes that are present in the routing database but are not currently active in the routing table. A route can become hidden for several reasons, including route-selection rules, policy decisions, or unresolved next-hop conditions. Examining hidden routes can help administrators understand why an apparently valid route is not being selected for forwarding. Terse output provides a compact view, summary output provides aggregate information, and protocol-specific commands focus on particular route sources. Hidden-route inspection is therefore useful when troubleshooting unexpected route-selection behavior.

Question 382

Which Junos command displays recent configuration commit history?

1. show system users
2. show system commit
3. show system storage
4. show system uptime

Correct Answer: 2

Explanation:

The show system commit command provides information about configuration commits performed on a Junos device. Commit history can help administrators determine when configuration changes occurred and identify the user associated with a particular commit. This information is valuable when troubleshooting unexpected behavior or reviewing recent administrative activity. User-session information is obtained through another command, while storage and uptime commands address system resources and runtime duration. Reviewing commit history can therefore provide useful operational context before investigating the exact configuration statements changed during a particular maintenance event.

Question 383

Which Junos command displays active system processes and resource usage?

1. show system processes extensive
2. show system users
3. show system commit
4. show system storage

Correct Answer: 1

Explanation:

The show system processes extensive command provides detailed information about running system processes and their resource utilization. Administrators can use this information to investigate unusual CPU consumption, identify active processes, and analyze system behavior. User-session information identifies logged-in users, commit information describes configuration history, and storage information focuses on filesystem capacity. Process-level monitoring is particularly useful when a device appears to experience high control-plane resource usage. The extensive process view therefore provides deeper operational information than a simple system-status summary.

Question 384

Which Junos mechanism schedules configuration activation for a future time?

1. commit confirmed
2. commit at
3. commit synchronize
4. commit check

Correct Answer: 2

Explanation:

The commit at mechanism allows a Junos configuration commit to be scheduled for a specified future time. This can be useful when maintenance changes need to become active during a planned service window rather than immediately after the administrator prepares the configuration. commit confirmed provides temporary activation with automatic rollback protection if confirmation is not received, while commit check validates configuration syntax and consistency without activating it. commit synchronize is associated with synchronizing configuration across redundant Routing Engines on supported systems. commit at therefore focuses specifically on scheduled configuration activation.

Question 385

Which Junos feature automatically reverts an unconfirmed configuration change?

1. commit check
2. commit confirmed
3. commit at
4. rollback

Correct Answer: 2

Explanation:

commit confirmed activates a configuration change while starting a confirmation timer. If the administrator does not confirm the commit before the timer expires, Junos can automatically revert to the previous committed configuration. This provides protection against configuration changes that accidentally disrupt management access or other critical functions. commit check validates configuration without activating it, while commit at schedules a commit for a specified time. Rollback selects earlier configuration states but does not provide the same automatic timeout-based safety mechanism. Commit confirmed is therefore an important operational safeguard for remote configuration changes.

Question 386

Which Junos operation validates configuration without activating changes?

1. commit check
2. commit at
3. commit confirmed
4. commit synchronize

Correct Answer: 1

Explanation:

The commit check operation validates the candidate configuration without actually activating it as the new active configuration. It can identify configuration syntax problems, conflicts, or other issues that would prevent a successful commit. This makes it useful before activating significant changes. commit confirmed activates a change with rollback protection, commit at schedules activation, and commit synchronize supports synchronization across redundant control components. Configuration validation is an important step because it allows administrators to detect problems before changing the operational device configuration.

Question 387

Which Junos feature synchronizes configuration between redundant Routing Engines?

1. commit at
2. commit check
3. commit synchronize
4. commit confirmed

Correct Answer: 3

Explanation:

The commit synchronize feature is used on supported Junos systems with redundant Routing Engines to synchronize committed configuration between the control components. This helps ensure that both Routing Engines have consistent configuration information. The feature is particularly relevant in high-availability architectures where the backup Routing Engine must be prepared to assume control if required. commit check validates configuration, commit confirmed provides rollback protection, and commit at schedules activation. Configuration synchronization therefore serves a different purpose from validation, scheduling, or temporary confirmation-based commits.

Question 388

Which Junos configuration command loads a complete replacement configuration?

1. load merge
2. load override
3. load replace
4. load patch

Correct Answer: 2

Explanation:

The load override operation replaces the existing candidate configuration with the configuration supplied by the loaded file or input. Because configuration that is absent from the replacement source can be removed from the candidate configuration, administrators should use this operation carefully. load merge combines new statements with existing candidate configuration, while other loading mechanisms have more targeted behavior. Before committing an override operation, reviewing the candidate configuration is important to ensure that required statements have not been unintentionally removed. Override is therefore the appropriate mechanism when a complete candidate configuration replacement is intended.

Question 389

Which Junos loading method replaces matching configuration sections?

1. load merge
2. load override
3. load replace
4. load patch

Correct Answer: 3

Explanation:

The load replace operation is intended to replace matching sections of the candidate configuration based on the supplied configuration input. It differs from load merge, which combines additional statements with the existing candidate configuration, and from load override, which can replace the candidate configuration more broadly. This makes replace useful when administrators want to update defined configuration sections without replacing unrelated parts of the entire candidate configuration. Understanding the differences between merge, replace, and override helps prevent accidental configuration changes during large-scale configuration loading.

Question 390

Which Junos routing option creates a manual route toward destination prefixes?

1. Static routing
2. Dynamic discovery
3. Neighbor discovery
4. Route reflection

Correct Answer: 1

Explanation:

Static routing allows administrators to manually configure routes toward specified destination prefixes. Unlike dynamic routing protocols, static routes do not automatically calculate or learn paths from routing neighbors. They can be useful for simple networks, default paths, backup connectivity, or specific forwarding requirements. Dynamic discovery relies on routing protocols, Neighbor Discovery is associated with IPv6 local-link operations, and route reflection improves BGP scalability. Static routing therefore provides direct administrative control over the path information installed for selected destinations.

Question 391

Which route type represents directly connected network reachability?

1. Local route
2. Direct route
3. Static route
4. Aggregate route

Correct Answer: 2

Explanation:

A direct route represents a network that is directly connected through an active interface. Junos can derive this routing information from the interface’s configured address and operational state. Local routes are associated with addresses belonging directly to the device itself, while static routes are manually configured and aggregate routes represent summarized reachability. Direct routes are therefore fundamental to the routing table because they describe networks that the device can reach without using another router as an intermediate next hop. Interface status can directly affect whether these routes are available.

Question 392

Which route represents an address assigned directly to the router?

1. Aggregate route
2. Direct route
3. Local route
4. Static route

Correct Answer: 3

Explanation:

A local route represents an address assigned to the Junos device itself. These routes allow the routing system to recognize traffic destined for addresses belonging to the local device rather than treating those destinations as remotely reachable networks. Direct routes represent connected networks, static routes are manually configured, and aggregate routes summarize broader routing information. The distinction between local and direct routes is important when interpreting routing tables because both may originate from interface configuration but represent different forwarding destinations. Local routes specifically identify addresses that terminate on the device itself.

Question 393

Which routing protocol supports path-vector decisions across autonomous systems?

1. OSPF
2. IS-IS
3. BGP
4. RIP

Correct Answer: 3

Explanation:

BGP is a path-vector routing protocol designed primarily for exchanging reachability information between autonomous systems. It carries attributes such as AS Path and other policy information that can influence route selection. OSPF and IS-IS are link-state interior gateway protocols, while RIP uses a distance-vector approach based on hop count. BGP’s path-vector design allows administrators to apply detailed routing policies across organizational or autonomous-system boundaries. Its use of path attributes also supports policy-driven decisions that are more extensive than the simple metric-based selection mechanisms found in many interior routing protocols.

Question 394

Which protocol provides encrypted site-to-site IP communication?

1. IPsec
2. SNMP
3. Syslog
4. NETCONF

Correct Answer: 1

Explanation:

IPsec provides security mechanisms for protecting IP traffic, including encryption and authentication capabilities used in VPN deployments. Site-to-site IPsec VPNs can create protected communication paths between network locations across an untrusted network such as the public Internet. SNMP is used for network management, Syslog records system events, and NETCONF provides structured device configuration and management. IPsec therefore specifically addresses confidentiality and integrity for IP communications. The exact security characteristics depend on the selected IPsec protocols, algorithms, authentication methods, and tunnel configuration.

Question 395

Which protocol provides structured configuration management over XML?

1. NETCONF
2. LLDP
3. RADIUS
4. PIM

Correct Answer: 1

Explanation:

NETCONF is a network-management protocol designed for structured configuration and operational management of network devices. It commonly uses XML-encoded data and works with a defined configuration datastore model. This makes NETCONF useful for automation because management applications can retrieve, modify, validate, and commit configuration through structured operations rather than relying exclusively on interactive CLI commands. LLDP discovers neighboring devices, RADIUS supports centralized authentication, and PIM handles multicast routing. NETCONF is therefore specifically associated with model-driven and structured device configuration management.

Question 396

Which data modeling language commonly describes NETCONF configuration structures?

1. JSON
2. YAML
3. YANG
4. CSV

Correct Answer: 3

Explanation:

YANG is a data modeling language used to describe configuration data, state information, notifications, and operational structures for network-management systems. NETCONF commonly uses YANG models to define the structure and meaning of the data exchanged between management applications and network devices. JSON and YAML are data serialization or configuration formats rather than the primary modeling language described here, while CSV represents tabular data. YANG therefore provides the formal schema that helps management systems understand the structure of network-device configuration and operational data.

Question 397

Which automation interface commonly uses gRPC for telemetry streaming?

1. JTI
2. ARP
3. VRRP
4. LACP

Correct Answer: 1

Explanation:

Juniper Telemetry Interface can use modern streaming mechanisms to deliver operational information from supported Junos devices toward external collectors. gRPC-based telemetry provides an efficient transport framework for continuously streaming structured data. This differs from traditional polling approaches where a management system repeatedly requests information. ARP handles IPv4 neighbor resolution, VRRP provides gateway redundancy, and LACP manages link aggregation. JTI therefore belongs to the telemetry and automation domain and can support high-frequency operational visibility when the platform and configuration provide the required telemetry capabilities.

Question 398

Which Junos automation mechanism executes actions when defined events occur?

1. Commit script
2. Event policy
3. Configuration group
4. Route policy

Correct Answer: 2

Explanation:

An event policy allows Junos to define actions that should occur when specified system events match configured conditions. This provides an automation mechanism for responding to operational events without requiring an administrator to manually execute every action. Commit scripts operate during configuration commits, configuration groups provide reusable configuration statements, and route policies control routing decisions. Event policies therefore focus on event-driven automation. They can be used to trigger operational responses based on system conditions, making them useful for automated monitoring and remediation workflows.

Question 399

Which Junos script type validates configuration during commit processing?

1. Event script
2. Commit script
3. Op script
4. Login script

Correct Answer: 2

Explanation:

Commit scripts execute during configuration commit processing and can be used to validate or manipulate configuration according to predefined logic. They provide administrators with a way to enforce configuration requirements beyond standard Junos validation. Event scripts respond to system events, while operational scripts can automate operational tasks or commands. Login scripts serve different session-related purposes. Commit scripts are therefore specifically associated with the configuration-commit workflow and can help enforce organizational configuration rules before changes become active.

Question 400

Which Junos script framework commonly uses SLAX for automation?

1. Commit automation
2. Event automation
3. Junos automation scripts
4. Packet sampling

Correct Answer: 3

Explanation:

Junos automation scripts can use scripting technologies such as SLAX to automate configuration and operational tasks. These scripts can extend device automation beyond the standard CLI by allowing administrators to implement reusable logic for specific operational requirements. Commit scripts and event scripts represent particular execution contexts within the broader automation framework, while packet sampling serves traffic-monitoring purposes. Junos automation scripting therefore provides a flexible mechanism for implementing customized device behavior. SLAX has historically been an important scripting language within the Junos automation ecosystem, although supported automation technologies can vary by platform and software release.