RCNI RUCKUS Certified Networking Implementer Exam Free Practice Exam Questions (2025 Updated)

In network architecture, a collapsed aggregation and core design consolidates the aggregation and core layers into a single layer, simplifying the network and reducing latency. RUCKUS ICX switch models suitable for such designs include:

ICX7850:

Overview:

A high-performance, stackable switch designed for enterprise aggregation and core layers.

Key Features:

Supports up to 32 ports of 40/100 GbE, providing high-density connectivity.

Advanced stacking capabilities, allowing up to 12 switches to be stacked together for simplified management and scalability.

Dual hot-swappable power supplies and fans, ensuring high availability and reliability.

Use Case:

Ideal for organizations seeking to implement a collapsed core architecture with high bandwidth requirements and simplified network management.

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 a core/edge network topology, Root Guard is a Spanning Tree Protocol (STP) feature that prevents designated ports from becoming root ports. This ensures that the core switch remains the root bridge, maintaining a stable and predictable network topology.

Configuration Steps:

Identify Core Ports Facing the Edge:

Determine which ports on the core switch connect to edge switches.

Enable Root Guard on These Ports:

Access the core switch's configuration mode.

For each identified port, apply the Root Guard configuration:

interface ethernet 1/1/1

spanning-tree root-guard

Replace 1/1/1 with the actual port identifier.

Example Configuration:

arduinoICX(config)# interface ethernet 1/1/1

ICX(config-if-e1000-1/1/1)# spanning-tree root-guard

This configuration ensures that port 1/1/1 on the core switch will not accept superior BPDUs, preventing edge switches from becoming the root bridge.

In RUCKUS ICX switches, assigning an interface to an OSPF (Open Shortest Path First) area involves configuring the interface with the appropriate OSPF area command. The correct command to assign an interface to a specific OSPF area is:

ip ospf area

For example, to assign an interface to area 0, you would enter interface configuration mode for the desired interface and execute:

ip ospf area 0

This command associates the interface with OSPF area 0, enabling OSPF routing on that interface within the specified area.

It's important to note that OSPF areas are logical groupings of networks and routers within an OSPF domain. Assigning interfaces to the correct OSPF areas is essential for efficient routing and network segmentation.

For comprehensive guidance on OSPF configuration, including assigning interfaces to areas, refer to the RUCKUS FastIron Configuration 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.

The RUCKUS ICX7150 series includes models designed for silent operation, suitable for deployments in noise-sensitive environments such as offices or classrooms.

To install a feature license on a RUCKUS ICX switch running FastIron 08.0.95, follow these steps using the Command Line Interface (CLI):

Obtain the License Key:

Purchase the desired feature license from RUCKUS.

Receive the license key, typically provided as a string of characters.

Access the Switch CLI:

Connect to the switch via console, SSH, or Telnet.

Enter privileged EXEC mode:

enable

Enter Global Configuration Mode:

Access global configuration mode:

configure terminal

Install the License Key:

Enter the license key using the following command:

Power over Ethernet (PoE) allows ICX switches to deliver electrical power to connected devices over standard Ethernet cables. The amount of power provided is determined by the PoE class assigned to the port. To supply a maximum of 15.4W to a connected device, the port should be configured to PoE Class 3.

PoE Power Classes:

Class 0: 0.44W to 12.95W

Class 1: 0.44W to 3.84W

Class 2: 3.84W to 6.49W

Class 3: 6.49W to 15.4W

Class 4: 15.4W to 30W (PoE+)

Configuration Steps:

Access the Switch's CLI:

Connect to the switch via console or SSH to access the Command Line Interface (CLI).

Enter Global Configuration Mode:

enable

configure terminal

Navigate to the Specific Interface:

Replace 1/1/1 with the appropriate interface identifier.

interface ethernet 1/1/1

Set the PoE Power Class:

Configure the port to provide power corresponding to Class 3.

inline power power-by-class 3

Exit Configuration Mode and Save Changes:

end

write memory

Verification:

Check PoE Status:

To verify the PoE status and power allocation on the configured port, use:

show inline power

This command displays the current PoE status, power consumption, and class information for each port.

Considerations:

Device Compatibility:

Ensure that the connected device is compatible with PoE Class 3 and does not require more than 15.4W.

Power Budget:

Monitor the switch's total PoE power budget to prevent over-subscription when multiple devices are connected.

References:

How to enable Dynamic PoE power on the ICX switches

FastIron 08.0.90 Command Reference Guide

To configure a RUCKUS ICX 7750 switch to honor Differentiated Services Code Point (DSCP)-based Class of Service (CoS) at the interface level, the trust dscp command is used. This command instructs the switch to trust and utilize the DSCP values in incoming packets for Quality of Service (QoS) decisions.

Configuration Steps:

Access the Switch's Command Line Interface (CLI):

Use SSH or a direct console connection to access the switch's CLI.

Enter Global Configuration Mode:

At the prompt, enter:

enable

configure terminal

Select the Interface to Configure:

Specify the interface where DSCP trust should be enabled. For example, to configure Ethernet interface 1/1/1:

interface ethernet 1/1/1

Adding a new member to an existing RUCKUS ICX switch stack can be accomplished through the following methods:

Stack Priority Configuration:

Determine the role of the new switch within the stack hierarchy by setting its priority.

Access the new switch's CLI.

Enter global configuration mode: configure terminal.

Set the stack unit ID and priority: stack unit [unit_id] priority [priority_value].

A higher priority value increases the likelihood of the switch becoming the stack master.

Save the configuration: write memory.

Manual Configuration:

Manually configure the new switch to match the existing stack settings.

Ensure the switch has a clean configuration by resetting it to factory defaults:

Enter global configuration mode: configure terminal.

Execute: write erase.

Reload the switch: reload.

Enable stacking:

Enter global configuration mode: configure terminal.

Execute: stack enable.

Connect the new switch to the existing stack using appropriate stacking cables.

On the stack master, use the stack secure-setup command to recognize and add the new member.

Verify the new member's addition by executing: show stack.

References:

For detailed procedures on building an ICX stack, refer to the RUCKUS Community Forums.

Ruckus Wireless Community

To display license information on a RUCKUS ICX switch, the following CLI commands are utilized:

show version:

This command provides detailed information about the switch's software and hardware, including installed licenses.

Usage:

sql

Copy code

show version

Output Includes:

Software version

Boot code version

License level and status

Hardware model

show license:

This command displays specific details about all installed licenses on the switch.

Usage:

sql

Copy code

show license

Output Includes:

License type

Activation status

Feature set enabled by the license

Expiration date (if applicable)

Example Outputs:

show version:

SW: Version 08.0.95dT213

Boot-Monitor Image: 10.1.15T225

HW: ICX7150-48P

License: L3 Premium

This output indicates the switch is running software version 08.0.95dT213 with an active Layer 3 Premium license.

show license:

License Level: L3 Premium

License Type: Permanent

License Status: Active

This output confirms the Layer 3 Premium license is permanently active on the switch.

References:

Ruckus ICX Switch Licensing Guide

Power over Ethernet (PoE) technology allows network switches to deliver electrical power to connected devices over standard Ethernet cables. The IEEE 802.3at standard, commonly known as PoE+, provides up to 30 watts of power per port. RUCKUS enhances this capability with a proprietary feature called PoE+ Overdrive, which increases the maximum power output per port.

With PoE+ Overdrive enabled, a PoE+ interface on RUCKUS ICX switches can deliver up to 45 watts of power over two pairs of wires. This enhancement is particularly beneficial for devices that require more power than the standard PoE+ provision, such as advanced wireless access points or video conferencing systems.

It's important to note that the actual power delivered to the powered device (PD) is slightly less due to cable losses. For instance, while the Power Sourcing Equipment (PSE) may supply 45 watts, the PD might receive approximately 35.5 watts. This ensures that devices receive sufficient power even after accounting for transmission losses.

The availability of PoE+ Overdrive and the maximum power output per port can vary depending on the specific ICX switch model. For example, the RUCKUS ICX 7650 supports PoE+ Overdrive with a maximum output of 45 watts per port. Similarly, the ICX 7150-48ZP model offers PoE+ Overdrive capabilities.

For detailed information on PoE+ Overdrive capabilities and supported models, refer to the "Ruckus Power over Ethernet (PoE) Interoperability" document.