RCNI問題集PDFでRCNIリアル試験問題解答
時間限定！今すぐ試そうRCNI試験 [2025] 問題集でRUCKUSのPDF問題
質問 # 25
Why is the following command failing?
RKUS-01(config)#vlan 1
RKUS-01(config-vlan-1)#tagged ethernet 1/2/1
Invalid input -> tagged ethernet 1/2/1
Type ? for a list
- A. VLAN 1 must be configured as a protocol-based VLAN before tagged ports can be added.
- B. A Virtual Ethernet interface must be defined before a tagged port can be added.
- C. This model ICX does not have an interface Ethernet 1/2/1.
- D. The default VLAN cannot be tagged to any interfaces.
正解：D
解説：
In RUCKUS ICX switches, VLAN 1 is the default VLAN and is typically used for management purposes. By default, all ports are members of VLAN 1 as untagged. Attempting to configure VLAN 1 as tagged on a port can result in an error, as the system restricts tagging the default VLAN.
Understanding the Error:
RKUS-01(config)# vlan 1
RKUS-01(config-vlan-1)# tagged ethernet 1/2/1
Invalid input -> tagged ethernet 1/2/1
Type ? for a list
This error occurs because the switch does not allow tagging of the default VLAN (VLAN 1) on any interface.
Resolution:
* Option 1: Use a Different VLAN for Tagging
* Create a new VLAN (e.g., VLAN 2) and configure it as tagged on the desired port.
RKUS-01(config)# vlan 2
RKUS-01(config-vlan-2)# tagged ethernet 1/2/1
* Option 2: Change the Default VLAN ID
* If you must use VLAN 1 as tagged, you can change the default VLAN ID to another VLAN (e.g., VLAN 2), allowing VLAN 1 to be configured as tagged.
RKUS-01(config)# default-vlan-id 2
RKUS-01(config)# vlan 1
RKUS-01(config-vlan-1)# tagged ethernet 1/2/1
質問 # 26
In the following output, what is the bridge priority of the root in hex?
- A. 0
- B. 1
- C. 9c49
- D. 2
正解：B
質問 # 27
ICX reserves some VLAN IDs for system functions. How many VLAN IDs are reserved?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
質問 # 28
As an IP packet is routed across subnets, which value gets updated at each hop?
- A. destination IP address
- B. subnet mask
- C. source IP address
- D. destination MAC address
正解：D
質問 # 29
Which command assigns an interface to an area?
- A. ip ospf area 0
- B. area 0
- C. ip ospf cost 100
- D. router ospf
正解：A
解説：
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 <area-id>
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.
質問 # 30
In the following output, what is the bridge priority of the root in hex?
- A. 0
- B. 1
- C. 9c49
- D. 2
正解：B
解説：
* Understanding Bridge Priority:
* The bridge priority in the Spanning Tree Protocol (STP) is represented in hexadecimal format in RUCKUS ICX switches.
* In the output, the bridge priority is a combination of the priority value (default is 32768 or
0x8000 in hex) and the VLAN ID.
* Why It Is 8000:
* Unless explicitly modified, the default bridge priority is 8000 in hexadecimal.
* Why Other Options Don't Apply:
* B. 0: This value does not align with the default or modified priority values.
* C. 9c49: This might represent a different component of the output, such as MAC address.
* D. 20009: This is an incorrect representation of the bridge priority.
References:
* ICX Spanning Tree Configuration Guide: RUCKUS Documentation
質問 # 31
Which two Power over Ethernet (PoE) features on the ICX will be enabled by the inline power poe-ha command? (Choose two.)
- A. power limit
- B. Perpetual PoE
- C. PoE Overdrive
- D. Fast Boot
- E. power priority
正解：B、D
解説：
The inline power poe-ha command on RUCKUS ICX switches enables two key Power over Ethernet (PoE) features:
* Fast Boot PoE: This feature ensures that PoE power is delivered to connected devices immediately upon switch startup, without waiting for the entire system to boot up. This is crucial for devices that need to be operational as soon as possible, such as IP phones or security cameras. To enable Fast Boot PoE, enter interface configuration mode and execute the command:
inline power poe-ha
This command ensures that PoE is delivered promptly during the boot process.
* Perpetual PoE: This feature maintains PoE power to connected devices even when the switch undergoes a soft reboot or firmware upgrade. It ensures uninterrupted power delivery, preventing devices from losing power during such events. To enable Perpetual PoE, use the same command in interface configuration mode:
By configuring this command, the switch provides continuous PoE power during reboots.
For more detailed information on these features and their configuration, refer to the RUCKUS Community Forum post titled "Things to consider about PoE at a glance, when deploying." Ruckus Wireless Community
質問 # 32
By default, how often are VRRP-E hello messages sent from the master?
- A. every 60 seconds
- B. every 1 second
- C. every 3 seconds
- D. every 5 seconds
正解：B
質問 # 33
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
正解：C
解説：
* 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
質問 # 34
Why is the following command failing?
RKUS-01(config)#vlan 1
RKUS-01(config-vlan-1)#tagged ethernet 1/2/1
Invalid input -> tagged ethernet 1/2/1
Type ? for a list
- A. VLAN 1 must be configured as a protocol-based VLAN before tagged ports can be added.
- B. A Virtual Ethernet interface must be defined before a tagged port can be added.
- C. This model ICX does not have an interface Ethernet 1/2/1.
- D. The default VLAN cannot be tagged to any interfaces.
正解：D
質問 # 35
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.
正解：D
質問 # 36
Which command could be used to find the system name of an attached device?
- A. show lldp neighbors
- B. ping
- C. show chassis
- D. show inline power
正解：C
質問 # 37
What is one advantage of the supportsave command versus the show tech-support command?
- A. Uploads directly to RUCKUS support.
- B. Uses fewer CPU cycles during execution.
- C. Allows the transfer of collected data to TFTP.
- D. Generates automatically after a system crash.
正解：A
質問 # 38
Which command must be configured at the interface level to honor Differentiated Services Code Point (DSCP)-based Class of Service (CoS) on a ICX7750?
- A. qos-tos map dscp-priority
- B. trust dscp
- C. qos profile
- D. ip dscp-remark 1
正解：B
質問 # 39
Which two ICX switch models are recommended for collapsed aggregation and core network designs?
(Choose two.)
- A. ICX7750
- B. ICX7550
- C. ICX7850
- D. ICX7450
- E. ICX7250
正解：A、C
解説：
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.
質問 # 40
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. enable stacking on the active controller
- D. configure each unit's management IP, VLANs, and tagging
- E. ensure units have clean configurations
正解：C、E
質問 # 41
For multicast clients to stop receiving traffic using a leave request, which protocol must run on the local subnet?
- A. IGMPv2
- B. PIM Dense
- C. IGMP Snooping
- D. IGMPv1
正解：D
質問 # 42
Which two commands display license information? (Choose two.)
- A. show license
- B. show chassis
- C. show who
- D. show inline power
- E. show version
正解：A、E
解説：
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
質問 # 43
Which configuration steps will add untagged ethernet ports 1/1/1 and 1/1/2 and tagged ethernet port 1/2/1 to VLAN 10?
- A. vlan 10
no tagged ethernet 1/1/1 to 1/1/2
tagged ethernet 1/2/1 - B. vlan 10
untagged ethernet 1/1/1 to 1/1/2
tagged ethernet 1/2/1 - C. untagged ethernet 1/1/1 to 1/1/2
tagged ethernet 1/2/1
vlan 10 - D. untagged ethernet 1/1/1 to 1/1/2 vlan 10
tagged ethernet 1/2/1 vlan 10
正解：B
質問 # 44
What is the maximum Wattage fur a PoE+ interface with PoE overdrive enabled?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
質問 # 45
What are two differences between Class of Service (CoS) and Differentiated Services Code Point (DSCP)?
(Choose two.)
- A. CoS defines priority levels and DSCP manipulates traffic according to these defined priority levels.
- B. DSCP operates at Layer 2 in OSI model, whereas CoS operates in Layer 3.
- C. DSCP defines priority levels and CoS manipulates traffic according to these defined priority levels.
- D. CoS operates at Layer 2 in OSI model, whereas DSCP operates in Layer 3.
- E. DSCP is simpler and can scale easily as the network grows. CoS becomes more complex as network demand for prioritized data increase.
正解：D、E
解説：
Class of Service (CoS) and Differentiated Services Code Point (DSCP) are both mechanisms used to prioritize network traffic, but they function at different layers of the OSI model and have distinct characteristics:
* Operational Layer:
* CoS:
* Operates at Layer 2 (Data Link Layer) of the OSI model.
* Utilizes a 3-bit field within the 802.1Q VLAN tag, known as the Priority Code Point (PCP), to assign priority levels ranging from 0 to 7.
* DSCP:
* Operates at Layer 3 (Network Layer) of the OSI model.
* Uses a 6-bit field in the IP header to assign priority, allowing for up to 64 different values, providing more granularity in traffic classification.
* Scalability and Complexity:
* CoS:
* With only 8 possible priority levels, CoS offers limited granularity.
* As network demands increase, especially with diverse applications requiring different levels of service, managing and differentiating traffic with CoS can become complex due to its limited priority levels.
* DSCP:
* Provides 64 distinct priority levels, allowing for finer differentiation of traffic types.
* This granularity enables easier scalability and more straightforward management of diverse and growing network traffic demands.
References:
* For a detailed comparison between CoS and DSCP, refer to the NetworkLessons Notes on QoS CoS vs DSCP: QoS CoS vs DSCP - NetworkLessons Notes
* For an overview of Differentiated Services and traffic classification, see the article on GeeksforGeeks:
Differentiated Services (DiffServ) and Traffic Classification
Understanding these differences is crucial for network administrators when designing Quality of Service (QoS) policies to ensure efficient and effective traffic management across the network.
質問 # 46
Which command will create VE 2 on an ICX running FastIron 08.0.95?
- A. ICX(config-vlan-2)# interface ve 2
- B. ICX(config-vlan-2)# router-interface ve 2
- C. ICX(config-vlan-2)# enable
- D. ICX(config-vlan-2)# vlan 2 name VE2
正解：C
質問 # 47
What is the maximum Wattage for a PoE+ interface with PoE overdrive enabled?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
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.
質問 # 48
As an IP packet is routed across subnets, which value gets updated at each hop?
- A. destination IP address
- B. subnet mask
- C. source IP address
- D. destination MAC address
正解：D
解説：
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.
質問 # 49
Which command enables global IPv6 capabilities?
- A. ipv6 nd proxy
- B. ipv6 unicast-routing
- C. ipv6 dhcp6-server enable
- D. ipv6 multicast
正解：B
質問 # 50
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