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Realistic RCNI Accurate & Verified Answers As Experienced in the Actual Test!
NEW QUESTION # 12
When using zero-touch stacking, which two prerequisites must be in place to ensure all devices join the stack? (Choose two.)
- A. enable stacking on all devices
- B. issue stack disable on intended member devices
- C. configure each unit's management IP, VLANs, and tagging
- D. enable stacking on the active controller
- E. ensure units have clean configurations
Answer: D,E
NEW QUESTION # 13
What is the maximum Wattage for a PoE+ interface with PoE overdrive enabled?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
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.
NEW QUESTION # 14
A customer required an access switch with a Power over Ethernet (PoE) budget not to exceed 240W. They also require the switch to make no fan noise. Which ICX switch would fit these requirements?
- A. ICX7150-C10ZP
- B. ICX7150-24P
- C. ICX7150-48P
- D. ICX7150-C12P
Answer: B
NEW QUESTION # 15
A Core, Aggregation, Edge topology network is running Rapid Spanning Tree Protocol (RSTP). Two switches at the edge are legacy and run 802.1D.
To influence the convergence time of the legacy switches at the edge, where are the timers modified?
- A. on the Aggregation switches connected to the legacy edge switches
- B. the route-only port on the upstream gateway
- C. on the root bridge at the core
- D. on the two legacy 802.1D switches at the edge
Answer: A
NEW QUESTION # 16
Which command can be used to identify Cyclic Redundancy Check (CRC) errors on port Ethernet 1/1/1?
- A. show mac-address ethernet 1/1/1
- B. show port security ethernet 1/1/1
- C. show statistics ethernet 1/1/1
- D. show interfaces brief ethernet 1/1/1
Answer: C
Explanation:
* Locating CRC Errors:
* The show statistics ethernet [port] command provides detailed port statistics, including packet counts, errors, and specifically Cyclic Redundancy Check (CRC) errors.
* Why Other Commands Don't Work:
* B. show interfaces brief ethernet 1/1/1: This provides a summary of interface status but does not include detailed error information like CRC errors.
* C. show mac-address ethernet 1/1/1: This displays MAC address table entries for the specified port, unrelated to error statistics.
* D. show port security ethernet 1/1/1: This shows port security configurations and violations, not errors like CRC.
References:
* ICX Switch Command Reference: RUCKUS Documentation
NEW QUESTION # 17
Which command will provide a maximum 15.4W to the connected Power over Ethernet (PoE) device?
- A. ICX(config-if-e1000-1/1/1)#inline power power-by-class 5
- B. ICX(config-if-e1000-1/1/1)#inline power power-by-class 3
- C. ICX(config-if-e1000-1/1/1)#inline power power-by-class 2
- D. ICX(config-if-e1000-1/1/1)#inline power power-by-class 4
Answer: B
Explanation:
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
NEW QUESTION # 18
Which ICX model can run silently in fanless mode?
- A. ICX7150-48P
- B. ICX7550-24P
- C. ICX7150-48ZP
- D. ICX7150-48PF
Answer: A
NEW QUESTION # 19
What are two differences between Class of Service (CoS) and Differentiated Services Code Point (DSCP)? (Choose two.)
- A. CoS operates at Layer 2 in OSI model, whereas DSCP operates in Layer 3.
- B. DSCP defines priority levels and CoS manipulates traffic according to these defined priority levels.
- C. DSCP is simpler and can scale easily as the network grows. CoS becomes more complex as network demand for prioritized data increase.
- D. CoS defines priority levels and DSCP manipulates traffic according to these defined priority levels.
- E. DSCP operates at Layer 2 in OSI model, whereas CoS operates in Layer 3.
Answer: A,D
NEW QUESTION # 20
As an IP packet is routed across subnets, which value gets updated at each hop?
- A. source IP address
- B. destination MAC address
- C. subnet mask
- D. destination IP address
Answer: B
NEW QUESTION # 21
In a core/edge network topology, which ports should have Root Guard enabled?
- A. edge ports facing the core
- B. management ports at the core
- C. route-only ports facing the WAN
- D. core ports facing the edge
Answer: D
Explanation:
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.
NEW QUESTION # 22
Which discovery protocol is enabled by default on all RUCKUS ICX platforms?
- A. LLDP
- B. CDP
- C. JDP
- D. FDP
Answer: A
NEW QUESTION # 23
Which ICX model has eight integrated QSFP28 ports?
- A. ICX7550-48F
- B. ICX7650-48F
- C. ICX7850-48F
- D. ICX7750-48F
Answer: B
NEW QUESTION # 24
Which two commands display license information? (Choose two.)
- A. show chassis
- B. show inline power
- C. show who
- D. show license
- E. show version
Answer: D,E
NEW QUESTION # 25
Which two commands can be used to display the IP address of a device attached to a switch port? (Choose two.)
- A. show interface
- B. show mac-address all
- C. show interface brief wide
- D. show lldp neighbor detail
- E. show arp
Answer: D,E
Explanation:
To determine the IP address of a device connected to a specific switch port on a RUCKUS ICX switch, the following commands can be utilized:
* show lldp neighbor detail
This command provides detailed information about devices connected via LLDP, including their IP addresses.
Command Usage:
show lldp neighbor detail
Output Example:
Local Port: 1/1/2
Neighbor MAC: 60d0.2c1c.1cd0
System Name: RuckusAP
Management Address: 192.168.0.3
In this example, the Management Address field displays the IP address of the connected device on port 1/1/2.
Ruckus Wireless Community
* show arp
The Address Resolution Protocol (ARP) table maps IP addresses to MAC addresses. By examining the ARP table, you can identify the IP address associated with a device's MAC address.
Command Usage:
show arp
Output Example:
IP Address MAC Address Type Age Port
192.168.0.3 60d0.2c1c.1cd0 Dynamic 0 1/1/2
Here, the IP address 192.168.0.3 is associated with the MAC address 60d0.2c1c.1cd0 on port 1/1/2.
Ruckus Wireless Community
Note: For the show lldp neighbor detail command to provide IP addresses, LLDP must be enabled on both the switch and the connected devices. Additionally, the devices should support LLDP and be configured to advertise their management addresses.
NEW QUESTION # 26
Which function is performed by ARP protocol?
- A. discover directly connected neighbors
- B. resolve host name
- C. build and maintain switch MAC tables
- D. resolve IP address to MAC address
Answer: D
Explanation:
The Address Resolution Protocol (ARP) is a fundamental protocol used in IP networking to map a device's IP address to its corresponding Media Access Control (MAC) address. This mapping is essential for enabling communication within a local network segment.
How ARP Works:
* ARP Request:
* When a device (Host A) needs to communicate with another device (Host B) on the same local network, it checks its ARP cache to see if it already has Host B's MAC address corresponding to its IP address.
* If the MAC address is not in the cache, Host A broadcasts an ARP request packet to all devices on the local network. This packet includes Host B's IP address and requests the MAC address associated with that IP.
* ARP Reply:
* Upon receiving the ARP request, the device with the matching IP address (Host B) responds with an ARP reply. This reply is sent directly to Host A and contains Host B's MAC address.
* Updating ARP Cache:
* Host A receives the ARP reply and updates its ARP cache with the new IP-to-MAC address mapping. This cached information allows for efficient communication without the need for repeated ARP requests.
Key Functions of ARP:
* IP to MAC Address Resolution:
* ARP's primary function is to resolve IP addresses to MAC addresses, enabling devices to locate each other on the same local network segment.
* Facilitating Data Link Layer Communication:
* By providing the necessary MAC address, ARP allows data packets to be correctly addressed and transmitted over the network's data link layer.
Clarifications on Other Options:
* Option B: Discover directly connected neighbors
* This function is typically performed by protocols like the Neighbor Discovery Protocol (NDP) in IPv6 or by network discovery tools, not by ARP.
* Option C: Build and maintain switch MAC tables
* Switches build and maintain MAC address tables by observing the source MAC addresses of incoming frames, a process independent of ARP.
* Option D: Resolve host name
* Resolving hostnames to IP addresses is the function of the Domain Name System (DNS), not ARP.
References:
* Understanding ARP (Address Resolution Protocol)
* How ARP Works
NEW QUESTION # 27
By default, how often are VRRP-E hello messages sent from the master?
- A. every 5 seconds
- B. every 1 second
- C. every 3 seconds
- D. every 60 seconds
Answer: B
Explanation:
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
Copy code
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
Copy code
vrrp <vrid> advertisement-interval <seconds>
* <vrid>: Virtual Router ID.
* <seconds>: Desired interval in seconds.
Example:
To set the hello interval to 2 seconds for VRID 1:
bash
Copy code
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
NEW QUESTION # 28
As an IP packet is routed across subnets, which value gets updated at each hop?
- A. source IP address
- B. destination MAC address
- C. subnet mask
- D. destination IP address
Answer: B
Explanation:
In network communications, when an IP packet traverses multiple subnets to reach its destination, certain header information is modified at each hop to facilitate proper routing and delivery.
* Destination MAC Address:
* Role: The Media Access Control (MAC) address is a hardware identifier used at the Data Link layer (Layer 2) of the OSI model.
* Update Process:
* As a packet moves from one router to the next, the destination MAC address is updated to reflect the MAC address of the next-hop device.
* This ensures that the packet is correctly forwarded at the Data Link layer within each local network segment.
* Explanation:
* When a router forwards a packet, it encapsulates the IP packet within a new Ethernet frame.
* The router sets the destination MAC address in this frame to the MAC address of the next- hop router or the final destination device if it is on the same local network.
* This process repeats at each hop, with each router updating the destination MAC address to ensure proper Layer 2 delivery.
* Other Header Fields:
* Destination IP Address:
* Remains unchanged throughout the packet's journey, ensuring end-to-end delivery to the correct device.
* Source IP Address:
* Also remains unchanged, identifying the original sender of the packet.
* Subnet Mask:
* Not a field within the packet header; it is used by routers to determine the network portion of an IP address but is not transmitted with the packet.
References:
* For a detailed understanding of how routers handle packet forwarding and the role of MAC addresses in this process, refer to the RUCKUS ICX Switch Configuration Guide, which provides insights into Layer 2 and Layer 3 forwarding mechanisms.
NEW QUESTION # 29
Review the following configuration.
A RADIUS server is connected and working. However, a switch technician has forgotten the RADIUS username/password for the ICX. When RADIUS is not functioning, they expect to be able to plug into the console port and use the local username/password as a backup.
The ICX does not accept the local password.
Why can't the technician log in?
- A. The AAA web-server configuration is missing the radius keyword.
- B. Based on the AAA login command, local should be in front of radius for correct backup operation.
- C. Local username/password is only used for SSH and web access.
- D. Based on the AAA login command, local password will only be used if the RADIUS server is unavailable.
Answer: D
Explanation:
* 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
NEW QUESTION # 30
Which two commands display Power over Ethernet (PoE) power budget? (Choose two.)
- A. show chassis
- B. show inline power detail
- C. show version
- D. show configuration
- E. show inline power
Answer: B,E
NEW QUESTION # 31
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RUCKUS RCNI Exam Syllabus Topics:
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