RUCKUS RUCKUS Certified Networking Implementer Exam RCNI Exam Dumps: Updated Questions & Answers (September 2025)

Understanding the Configuration:

The command aaa authentication login default radius local specifies that the switch will attempt RADIUS authentication first. If the RADIUS server is unavailable, it will fallback to the local username/password.

If the RADIUS server is operational, the local credentials will not be accepted, even over the console port.

Why Can't the Technician Log In?

The local username/password will only work if the RADIUS server is unreachable. In this scenario, the RADIUS server is functional, so the switch continues to authenticate through it and does not fall back to the local credentials.

This behavior is by design, as dictated by the configuration.

Solution:

If access to the console port using local credentials is a critical requirement, consider adjusting the configuration to prioritize local credentials. For example, use:

aaa authentication login default local radius

This configuration ensures that local credentials are tried first, with RADIUS as a secondary option.

References:

ICX Switch Command Reference Guide (AAA Configuration Section): RUCKUS Support

RSTP and Legacy 802.1D Compatibility:

RSTP (802.1w) can interoperate with legacy switches running STP (802.1D). However, the legacy switches use different timers and convergence mechanisms, which can lead to delays.

Optimizing Timers for Legacy Edge Switches:

The edge switches running 802.1D rely on BPDU timing set by the upstream aggregation switches.

To influence the convergence time, the timers such as hello time, max age, and forward delay must be adjusted on the aggregation switches connected to these legacy edge switches. This ensures better compatibility and faster convergence.

Why Not Other Options?

A: The route-only port does not participate in STP.

B: Timers cannot be modified on legacy switches themselves as they strictly follow 802.1D standards.

D: The root bridge sets global parameters but does not address edge-specific timer optimization.

References:

RUCKUS RSTP/802.1D Compatibility Guide: RUCKUS Documentation

Layer 3 Address Assignment:

Stack Interface (A): A stack interface is a virtual interface representing all members of a stack. It can be assigned a Layer 3 IP address for management or routing purposes.

Loopback (E): Loopback interfaces are virtual interfaces always "up" and used for routing, management, or stable endpoint addressing.

GRE Tunnels (F): GRE tunnels operate at Layer 3 and require IP addresses for both endpoints to encapsulate and route traffic.

Why Not Other Options?

B. VxLAN: VxLAN operates at Layer 2 over Layer 3 and does not require direct IP address assignment to itself.

C. Virtual LAN: VLANs are Layer 2 constructs; while they are associated with SVI (Switch Virtual Interfaces), they are not directly assigned an IP address.

D. Virtual Ethernet: Virtual Ethernet interfaces are typically Layer 2 and used within virtualized environments, not directly assigned Layer 3 addresses.

References:

ICX Routing Configuration Guide: RUCKUS Documentation

To define static routes on a device running FastIron SPS08095e code, it's essential to have the appropriate licensing in place.

Understanding Licensing Requirements:

RUCKUS ICX switches require specific licenses to enable advanced features.

The "L3-prem" (Premium Layer 3) license unlocks advanced routing capabilities, including the ability to configure static routes.

Verifying Current License Status:

Access the switch's command-line interface (CLI).

Execute the command show license to display the current licensing status.

Check for the presence of the "L3-prem" license in the output.

Installing the L3-prem License:

If the "L3-prem" license is not installed, obtain it from RUCKUS Networks or an authorized distributor.

Follow the official RUCKUS licensing guide for detailed installation instructions.

Configuring Static Routes:

Once the "L3-prem" license is active, enter global configuration mode by typing configure terminal.

Use the ip route command to define static routes. For example: ip route [destination_network] [subnet_mask] [next_hop_ip].

After configuring, save the settings with the write memory command to ensure persistence across reboots.

References:

For detailed information on licensing and feature sets, refer to the FastIron 08.0.95 (GA) Software Licensing Guide.

The RUCKUS ICX7850 series offers high-performance switches suitable for core and aggregation layers in enterprise networks. Among the models in this series:

ICX7850-32Q:

Overview:

Designed for high-density 100GbE deployments.

Port Configuration:

32 ports of 100GbE QSFP28.

Use Case:

Ideal for environments requiring extensive 100GbE connectivity, such as data centers or large enterprise cores.

ICX7850-48F:

Overview:

Designed for high-density 25GbE deployments with additional uplink capabilities.

Port Configuration:

48 ports of 1/10/25GbE SFP28.

8 ports of 40/100GbE QSFP28 for uplinks or stacking.

Use Case:

Suitable for aggregation layers where a mix of 25GbE access ports and high-speed uplinks are needed.

ICX7750-32Q:

Overview:

Part of the ICX7750 series, designed for high-performance aggregation and core layers.

Port Configuration:

32 ports of 40GbE QSFP+.

Supports breakout cables for 10GbE connections.

Use Case:

Suitable for networks requiring 40GbE connectivity with flexibility for 10GbE access.

ICX7850-48FS:

Overview:

Similar to the ICX7850-48F but includes MACsec support for enhanced security.

Port Configuration:

48 ports of 1/10/25GbE SFP28 with MACsec.

8 ports of 40/100GbE QSFP28 for uplinks or stacking.

Use Case:

Ideal for secure aggregation layers requiring MACsec encryption.

References:

For detailed specifications, refer to the ICX 7850 data sheet: ICX 7850 Data Sheet

In summary, the ICX7850-32Q model offers the highest number of 100GbE ports among the listed options, making it the optimal choice for scenarios demanding extensive 100GbE connectivity.

Dynamic ARP Inspection (DAI) is a security feature that intercepts and validates Address Resolution Protocol (ARP) packets in a network. It ensures that only legitimate ARP requests and responses are relayed, preventing ARP spoofing and man-in-the-middle attacks.

Conditions Allowing ARP Packets to Pass DAI Checks:

IP/MAC Pair in the DHCP Binding Database:

When DHCP snooping is enabled, the switch maintains a binding table of IP-to-MAC address mappings assigned by the DHCP server.

DAI uses this database to verify that ARP packets have legitimate IP/MAC address pairs.

If the ARP packet's IP/MAC pair matches an entry in the DHCP binding database, it passes the DAI check.

Static ARP Entry with Inspection Flag Set:

Administrators can configure static ARP entries for known devices, marking them as trusted for DAI purposes.

These entries include the IP/MAC pair and are flagged to bypass DAI checks.

An ARP packet matching a static entry with the inspection flag set will pass the DAI check.

Request Originated on a Trusted Port:

Ports can be designated as trusted, typically those connected to other switches or network devices.

DAI does not inspect ARP packets arriving on trusted ports, assuming they are from legitimate sources.

Therefore, ARP requests or responses from a trusted port pass the DAI check.

References:

For more information on configuring DAI and related security features, refer to the RUCKUS FastIron Layer 3 Routing Configuration Guide: Dynamic ARP Inspection overview

Implementing DAI with these conditions helps protect the network from ARP-based attacks by ensuring that only validated ARP traffic is permitted.

In Virtual Router Redundancy Protocol Extended (VRRP-E) configurations on RUCKUS ICX switches, the master router sends hello messages at regular intervals to indicate its active status. By default, these hello messages are sent every 1 second.

Key Points:

Hello Interval: The frequency at which the master router sends hello messages to backup routers.

Default Value: 1 second.

Purpose: To inform backup routers of the master's presence and operational status. If backup routers do not receive hello messages within a specified dead interval, they assume the master is down and initiate a failover.

Configuration:

Viewing Current Settings:

To display the current VRRP-E configuration, including hello intervals:

sql

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show vrrp

Modifying the Hello Interval:

To change the hello interval, enter VRRP-E configuration mode for the specific virtual router instance and use the following command:

php

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vrrp advertisement-interval

: Virtual Router ID.

: Desired interval in seconds.

Example:

To set the hello interval to 2 seconds for VRID 1:

bash

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enable

configure terminal

interface ethernet 1/1/1

vrrp 1

advertisement-interval 2

exit

write memory

Considerations:

Network Stability: Setting the hello interval too low can lead to unnecessary failovers due to transient network issues. Conversely, setting it too high can delay failover detection.

Consistency: Ensure that all routers in the VRRP-E group have consistent hello and dead interval settings to prevent configuration mismatches.

References:

Ruckus FastIron Layer 3 Routing Configuration Guide, 08.0.91

Ruckus FastIron Command Reference Guide, 08.0.70

To monitor and manage the PoE power budget on RUCKUS ICX switches, the following commands are utilized:

show inline power Command:

Purpose: Displays a summary of the PoE status, including total power capacity, power consumption, and available power.

Usage:

Access the switch's command-line interface (CLI).

Enter the command:

plaintext

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show inline power

Output Details:

Power Capacity: Total PoE power available on the switch.

Power Allocations: Power consumption per port, indicating which ports are supplying power to connected devices.

Example Output:

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Power Capacity: Total is 124000 mWatts. Current Free is 64000 mWatts.

Power Allocations: Requests Honored 8 times

Port Admin Oper ---Power (mWatts)--- PD Type PD Class Pri Fault/

State State Consumed Allocated Error

-----------------------------------------------------------------------------

1/1/1 On On 4733 30000 2P-IEEE Class 4 3 n/a

1/1/2 On Off 6015 30000 2P-IEEE Class 4 3 n/a

(additional ports)

In RUCKUS ICX switches, certain VLAN IDs are reserved for system functions and cannot be used for user-defined VLANs. Specifically, the following VLAN IDs are reserved:

VLAN 0: Reserved for priority tagging.

VLAN 1: Default VLAN for untagged frames.

VLAN 4095: Reserved and cannot be used.

VLAN 4094: Reserved and cannot be used.

VLAN 4093: Reserved and cannot be used.

This totals to 5 reserved VLAN IDs.

These reservations are standard across many networking devices to ensure proper network operations and to avoid conflicts with system-level processes. It's important to note that while VLAN 1 is the default VLAN, it can be reassigned if necessary, but caution should be exercised to avoid disrupting network management and control traffic.

For detailed information on VLAN configuration and reserved VLAN IDs on RUCKUS ICX switches, please refer to the RUCKUS FastIron Layer 2 Switching Configuration Guide:

FastIron Layer 2 Switching Configuration Guide

This guide provides comprehensive information on VLAN management, including details on reserved VLAN IDs and best practices for VLAN configuration on RUCKUS ICX switches.

RUCKUS ICX switches support stacking over both copper and fiber connections, allowing for flexible deployment across various distances:

Copper Stacking Cables:

Maximum Distance:

Up to 5 meters using active direct-attach copper (DAC) cables.

Use Case:

Suitable for stacking switches within the same rack or in close proximity.

Fiber-Optic Stacking Cables:

Maximum Distance:

Up to 40 kilometers using appropriate optical transceivers and single-mode fiber.

Use Case:

Ideal for stacking switches located in different buildings or across a campus environment.

References:

For detailed information on stacking distances and supported optics, refer to the FastIron stacking distances and optics guide: FastIron stacking distances and optics by device

By utilizing fiber-optic connections with appropriate transceivers, ICX switches can be stacked over substantial distances, providing flexibility in network design and deployment.