View Full Juniper JN0-253 Exam Dumps and Practice Test Dumps.

 

Question 61

Which command displays the active BGP peer summary on a Junos routing device?

1. show ospf neighbor
2. show bgp summary
3. show route summary
4. show interface terse

Correct Answer: 2

Explanation

The show bgp summary command is the essential operational tool utilized by network engineers to inspect the live status, session states, and prefix advertisement statistics of all configured Border Gateway Protocol peers. When executed on a Junos routing platform, it outputs critical runtime details including remote peer IP addresses, autonomous system numbers, active connection states (such as Established, Idle, or Active), and the total number of prefixes received from each peer. Verifying this output allows administrators to quickly identify peer flapping, session reset issues, or configuration mismatches across enterprise routing architectures.

Question 62

What is the primary function of a Mist Edge device in a remote campus or branch architecture?

1. Core database replication
2. Dynamic routing protocol convergence
3. Tunnel aggregation for remote access points
4. Local web proxy caching

Correct Answer: 3

Explanation

Mist Edge is expertly engineered to extend corporate campus fabrics and provide distributed tunnel aggregation capabilities for remote access point deployments. It terminates secure IPsec or GRE tunnels originating from remote branch access point deployments right back to the central datacenter or enterprise campus edge. This allows network administrators to maintain centralized tunneling policies, dynamic VLAN mapping, and secure traffic steering while still leveraging decentralized wireless architectures across various branch offices seamlessly without adding administrative complexity.

Question 63

Which protocol is used by Mist-managed switches to stream real-time streaming telemetry to the cloud?

1. gRPC streaming telemetry
2. SNMP polling
3. Syslog forwarding
4. NetFlow export

Correct Answer: 1

Explanation

Mist-managed switches utilize modern streaming telemetry mechanisms powered by gRPC and protocol buffers to communicate effectively with the cloud architecture. Unlike traditional polling methods such as SNMP which can introduce high latency and resource overhead, gRPC streaming pushes real-time interface statistics, CPU utilization, and hardware sensor metrics directly to the cloud platform. This enables instantaneous visibility, rapid event correlation, and precise analytics within the Mist dashboard interface without straining switch CPU cycles.

Question 64

In a Juniper Virtual Chassis configuration, what role does the switch with the highest routing engine priority assume by default?

1. Line card member
2. Backup routing engine
3. Secondary standby bridge
4. Master routing engine

Correct Answer: 4

Explanation

Within a Juniper Virtual Chassis architecture, member switches are assigned specific operational roles to manage the combined logical entity efficiently. The switch configured with the highest routing engine priority value assumes the Master role, taking charge of the shared control plane, generating unified configuration databases, and synchronizing routing tables across the stack. The switch with the second-highest priority automatically assumes the Backup role to ensure seamless, hitless failover capabilities if the primary Master switch encounters a hardware failure or reboot event.

Question 65

Which Mist AI feature provides automated root cause analysis through a conversational natural language interface?

1. Client SLE metrics
2. Marvis Actions framework
3. Dynamic packet capture
4. Radio resource management

Correct Answer: 2

Explanation

The Marvis Actions framework revolutionizes network management by incorporating a conversational interface that interprets natural language queries from engineers. Users can ask complex questions regarding client connectivity, switch health, or firmware statuses in plain English, and Marvis responds with precise diagnostic details and clear remediation steps. This conversational capability bridges the gap between complex network telemetry data and fast administrative decision-making across enterprise environments without requiring steep learning curves.

Question 66

What is the primary purpose of OSPF authentication in enterprise routing environments?

1. Encrypting all transit payload data streams
2. Preventing unauthorized routers from joining the OSPF routing domain
3. Accelerating packet forwarding performance across interfaces
4. Compressing routing table memory footprints

Correct Answer: 2

Explanation

OSPF authentication mechanisms are designed specifically to secure routing protocol exchanges by verifying the identity of neighboring routers before establishing adjacencies. By implementing plaintext passwords or cryptographic MD5/SHA authentication keys on OSPF interfaces, network administrators prevent rogue devices or malicious actors from injecting false link-state advertisements or participating in the routing domain. While OSPF authentication does not encrypt user data payloads traversing the network, it strictly safeguards the integrity and authenticity of the control plane routing topology.

Question 67

Which Junos configuration mode command discards all uncommitted candidate changes and exits the editor?

1. rollback 0
2. discard changes
3. clear configuration
4. exit discard

Correct Answer: 2

Explanation

In Junos OS, the discard changes command is used within configuration mode to abandon any pending modifications made to the active candidate configuration database without applying them. This is an essential safety feature when an administrator tests complex configuration scenarios or makes inadvertent syntax edits and wishes to revert the candidate database back to the exact state of the current running configuration. Once executed, the editor discards the staging buffer and preserves system stability.

Question 68

What metric does Mist Wireless Assurance use to quantify client connection success rates?

1. Time-to-connect SLE metric
2. Raw signal strength RSSI value
3. Channel utilization percentage
4. Access point CPU utilization load

Correct Answer: 1

Explanation

Service Level Expectations metrics serve as the essential foundation for measuring actual user experience within the modern Mist architecture. The time-to-connect SLE metric specifically tracks the duration required for a client device to successfully complete association, authentication, and DHCP IP address acquisition. By continuously evaluating this metric against predefined baselines, network administrators can instantly identify whether users are experiencing satisfactory onboarding performance or encountering specific connection roadblocks across the wireless infrastructure.

Question 69

Which standard defines Rapid Spanning Tree Protocol for fast topology convergence?

1. IEEE 802.1Q
2. IEEE 802.3ad
3. IEEE 802.1w
4. IEEE 802.1X

Correct Answer: 3

Explanation

Rapid Spanning Tree Protocol is standardized globally under IEEE 802.1w, offering significant convergence speed improvements over legacy IEEE 802.1D bridging standards. RSTP introduces explicit proposal-agreement handshakes between neighboring switches, allowing designated and root ports to transition directly into forwarding states almost instantaneously when link changes occur. This eliminates the lengthy listening and learning delays of older protocols, preventing broadcast storms and bridge loops while maintaining uninterrupted application session uptime.

Question 70

What is the function of DHCP Snooping in an enterprise switching architecture?

1. Encrypting client passwords during authentication
2. Allocating static IP addresses to printers automatically
3. Building a binding database to prevent rogue DHCP server attacks
4. Translating domain names into IP addresses

Correct Answer: 3

Explanation

DHCP Snooping acts as a foundational layer two security control that intercepts DHCP traffic and differentiates between trusted port connections linked to legitimate corporate DHCP servers and untrusted ports facing client endpoints. By tracking dynamic IP-to-MAC address assignments, the switch builds a secure binding database. If an unauthorized rogue device attempts to connect a fake DHCP server to an untrusted access port and distribute malicious gateway configurations, the switch drops the rogue offer packets instantly, protecting clients from IP exhaustion and redirection attacks.

Question 71

Which Juniper software feature allows an administrator to revert to previous configurations by specifying an archival index?

1. Commit confirmed timer
2. Rollback command
3. Factory reset jumper
4. Rescue configuration backup

Correct Answer: 2

Explanation

The Junos rollback command allows administrators to instantly revert the active candidate configuration to any previously committed configuration stored in the system archives. Junos automatically maintains up to fifty historical rollback files, indexed numerically from zero (the most recent commit) up to forty-nine. By specifying a rollback index number, engineers can quickly undo recent configuration errors or restore known good operating states without manually retyping configuration hierarchies.

Question 72

How do Mist access points track client location and asset movement indoors?

1. High-frequency radar tracking modules
2. GPS satellite triangulation receivers
3. Multi-element Bluetooth Low Energy array
4. Infrared thermal motion detectors

Correct Answer: 3

Explanation

Mist access points feature a patented multi-element Bluetooth Low Energy antenna array that enables highly accurate indoor location services and asset tracking. Unlike traditional single-antenna Bluetooth solutions, the virtual BLE array listens to beacons from client devices and computes precise locations using advanced machine learning algorithms. This capability supports proximity messaging, asset tracking, and indoor wayfinding without requiring dedicated hardware location overlay beacons or complicated physical site calibrations.

Question 73

Which protocol acts as the control plane protocol for EVPN in modern data center fabrics?

1. Border Gateway Protocol (BGP)
2. Open Shortest Path First (OSPF)
3. Routing Information Protocol (RIP)
4. Intermediate System to Intermediate System (IS-IS)

Correct Answer: 1

Explanation

Ethernet Virtual Private Network relies on Multiprotocol Border Gateway Protocol (MP-BGP) as its foundational control plane protocol. EVPN uses BGP to distribute layer two MAC addresses and layer three routing reachability information across standard IP core networks. This decouples virtual workloads from physical network topologies, allowing seamless layer two mobility across disparate data centers while maintaining multi-tenancy, localized ARP suppression, and optimized multi-path forwarding without traditional spanning tree protocol limitations.

Question 74

What does a flashing green LED status indicator typically signify on a Mist access point?

1. Critical hardware memory failure
2. Firmware upgrade or image download in progress
3. Complete loss of cloud connectivity
4. Active Bluetooth low energy beacon mode

Correct Answer: 2

Explanation

On Juniper Mist access points, integrated multi-color LED status indicators provide immediate visual feedback regarding the operational health and activity state of the hardware. A flashing green indicator typically signals that a firmware upgrade, image download, or configuration synchronization process is currently in progress. This visual cue alerts engineers that the access point is actively processing software updates and should not be powered off or disconnected from the network until the sequence completes successfully.

Question 75

Which command displays the detailed operational status of physical and logical interfaces on a Junos device?

1. show route active
2. show system alarms
3. show interface extensive
4. show chassis routing-engine

Correct Answer: 3

Explanation

The show interface extensive command provides an exhaustive, granular diagnostic output for physical and logical interfaces configured on a Junos routing or switching platform. It displays comprehensive operational statistics including packet counts, byte rates, error counters, CRC drops, queue drops, physical duplex settings, encapsulation types, and specific hardware transceiver diagnostics. This command is an indispensable asset for network engineers troubleshooting physical layer issues, duplex mismatches, or interface congestion.

Question 76

What is the primary benefit of deploying Link Aggregation Control Protocol (LACP) in switch designs?

1. Combining multiple physical links into a single logical high-bandwidth channel with redundancy
2. Converting copper Ethernet cabling into long-distance single-mode fiber optic runs
3. Securing wireless management frames against over-the-air sniffing attacks
4. Automatically generating dynamic VLAN assignment tags for unmanaged IoT devices

Correct Answer: 1

Explanation

Link Aggregation Control Protocol, standardized under IEEE 802.3ad, enables administrators to bundle several physical Ethernet interfaces together to act as a single logical connection. LACP automates member link health checks, increases total available bandwidth between switches or servers beyond the limits of a single physical cable, and provides instantaneous failover redundancy if an individual physical cable or transceiver fails. Traffic is intelligently hashed across the member links to ensure balanced utilization across the aggregated bundle.

Question 77

Which security feature inspects ARP traffic using trusted database bindings to block IP spoofing?

1. Port Security
2. Dynamic ARP Inspection (DAI)
3. MACsec Encryption
4. Storm Control

Correct Answer: 2

Explanation

Dynamic ARP Inspection is a security feature that leverages valid bindings stored within the DHCP snooping database to intercept, inspect, and drop malicious ARP packets. In typical enterprise networks, attackers attempt man-in-the-middle attacks by poisoning ARP caches with forged address bindings, tricking devices into sending traffic to unauthorized MAC addresses. DAI validates every untrusted ARP packet against verified IP-to-MAC bindings, discarding anomalous or conflicting frames immediately. This protects the local network segment from spoofing attacks and ensures data confidentiality and integrity at layer two.

Question 78

What is the primary role of Radio Resource Management (RRM) in enterprise wireless networks?

1. Encrypting wireless user payload data streams
2. Managing guest portal splash page redirection
3. Dynamically optimizing channel assignment and RF power levels
4. Allocating IP addresses to mobile wireless endpoints

Correct Answer: 3

Explanation

Radio Resource Management is an automated feature designed to continuously monitor wireless RF environments and dynamically adjust access point power levels and channel assignments. In dense enterprise deployments, RRM mitigates co-channel interference, balances client load across available access points, and ensures optimal coverage blankets. By reacting intelligently to real-time environmental changes, RRM maintains high wireless performance without requiring manual RF site survey adjustments or constant human intervention.

Question 79

Which Junos configuration mode command permits testing a configuration change for a specified duration before rolling it back automatically?

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

Correct Answer: 2

Explanation

The commit confirmed command in Junos OS is a critical safety mechanism designed to prevent network engineers from locking themselves out of remote devices due to erroneous configuration changes. When an administrator executes a commit confirmed command, the device applies the configuration temporarily while starting a countdown timer. If the engineer loses network connectivity and fails to verify the changes with a standard commit command before the timer expires, Junos automatically rolls back the configuration to the previous stable state, restoring management access instantly.

Question 80

What is the primary benefit of utilizing cloud proxy architecture for enterprise switch management?

1. Eliminating physical cabling requirements between switches
2. Enabling secure outbound-only firewall traversal for cloud connectivity
3. Converting Layer 2 switching frames directly into Layer 7 application packets
4. Boosting switch power delivery wattage for high-power PoE devices

Correct Answer: 2

Explanation

Cloud proxy mechanisms and outbound connection designs allow managed network devices to establish secure sessions out to the cloud management platform without requiring complex inbound firewall rule modifications. By utilizing standard outbound ports such as HTTPS, switches and access points can securely register, download configurations, and stream telemetry while remaining fully protected behind corporate perimeter firewalls and network address translation boundaries without exposing management planes. This outbound-only communication model satisfies strict corporate security policies.