[2025年03月]更新の100-490試験問題集合格させるのは2025年最新のSupporting Cisco Routing and Switching Network Devices
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質問 # 13
What does Cisco use for Return Materials Authorization tracking of field-replaceable parts?
- A. serial number
- B. FRU number
- C. product number
- D. RMA number
正解：D
解説：
RMA (Return Materials Authorization) is a tracking number that is assigned to a product that is being returned to the manufacturer for repair or replacement. The RMA number allows the manufacturer to track the progress of the return and ensure that the product is returned to the correct customer.
質問 # 14
Which method is the fastest way to recover a software version that supports a USB flash port on a Cisco device?
- A. copy command with USB memory
- B. copy tftp flash: command
- C. xmodem transfer command
- D. tftp command
正解：A
質問 # 15
Which type of custom scripting has Cisco NX-OS added to help manage user networks?
- A. SQL
- B. Collective
- C. C++
- D. Python
正解：D
解説：
Cisco NX-OS has added support for Python scripting to help manage user networks. Python is a powerful and versatile scripting language that is widely used for automation tasks, including network management. Cisco NX-OS leverages Python to enable network administrators to write custom scripts and programs that can interact with the network operating system, automate repetitive tasks, and integrate with other systems and APIs. This support for Python scripting is part of Cisco's commitment to network programmability and automation, allowing for more efficient and flexible network operations12.
質問 # 16
Which two statements about a SmartJack are true? (Choose two.)
- A. It provides channel testing.
- B. It acts as a concentration point for dial-in and dial-out connections.
- C. It provides signal conversion.
- D. It regenerates the signal to compensate for signal degradation from line transmission.
- E. It operates at Layer 2 of the OSI model.
正解：C、D
解説：
Section: Cisco Equipment and Related Hardware
Explanation
質問 # 17
Which Cisco CPAK 100GBASE module supports Multimode Fiber cable?
- A. Cisco CPAK-100G-SR4
- B. Cisco CPAK-100G-LR4
- C. Cisco CPAK-100G-CWDM4
- D. Cisco CPAK-100G-ER4L
正解：A
解説：
The Cisco CPAK-100G-SR4 module is designed to support Multimode Fiber (MMF) cable. It is specifically engineered for high-bandwidth 100G optical links and supports link lengths of up to 70 meters over OM3 and 100 meters over OM4 Multimode Fiber with MPO connectors. This module is well-suited for short-range, high-speed data communications and data center applications where Multimode Fiber is typically used due to its ability to handle the large amount of data traffic over relatively short distances. Reference := Cisco CPAK 100GBASE Modules Data Sheet
質問 # 18
Which command returns the user to the main configuration prompt from the interface configuration prompt?
- A. exit
- B. end
- C. clear
- D. quit
正解：A
解説：
The command that returns the user to the main configuration prompt from the interface configuration prompt is exit. When you are in interface configuration mode on a Cisco device and you want to return to the global configuration mode, you use the exit command. If you want to go all the way back to privileged EXEC mode, you would use the end command or press Ctrl-Z1.
質問 # 19
Which command displays a list of file systems that are available on Cisco devices?
- A. show version
- B. show directory
- C. show file system
- D. show memory
正解：C
解説：
The command show file system is used on Cisco devices to display a list of all the file systems available. This command provides information about each file system, including its name, size, free space, and file system type (such as flash or nvram). It's a useful command for network administrators to manage and navigate through different storage areas on Cisco devices, ensuring they can access and maintain the device's file structure effectively. Reference := File System Commands on Cisco IOS XR Software - Cisco, Working with the Cisco IOS File System, Configuration Files, and Software Images
質問 # 20
Which command displays the configuration register setting?
- A. show config-register
- B. show flash
- C. show running-config
- D. show version
正解：D
解説：
The show version command on Cisco devices provides a variety of system information, including:
Cisco IOS version: The version of the Cisco IOS software running on the device.
Boot image: The location of the IOS image used during startup.
Hardware information: Model, processor type, memory details.
Interfaces: A list of the device's interfaces.
Configuration register: The current value of the configuration register, typically displayed near the end of the output.
Why other options are incorrect:
show flash: Displays the contents of flash memory, but not the configuration register.
show running-config: Displays the currently active configuration, but the configuration register setting is not directly part of the running configuration.
show config-register: This is not a standard Cisco IOS command.
質問 # 21
Which type of Cisco console cable is used to connect a laptop to the console port on a Cisco router?
- A. rollover
- B. straight-through
- C. fiber
- D. crossover
正解：A
解説：
Rollover cables are specifically designed for connecting to the console ports on Cisco routers and switches. Here's why they are the right choice:
Pinout: Rollover cables have a reversed pinout compared to standard Ethernet cables. This matches the console port's wiring, allowing for configuration access.
Appearance: Rollover cables are often light blue in color to help distinguish them from standard Ethernet cables.
USB Adapter: Many modern laptops may not have a direct serial port. In this case, a rollover cable with a USB-to-serial adapter is used.
Why other options are incorrect:
Straight-through: Used for connecting unlike devices (e.g., switch to computer). They won't have the correct wiring for console connections.
Fiber: Used for high-speed, long-distance networks. Console ports use a serial-based connection, not fiber optics.
Crossover: Used to connect similar devices (e.g., switch to switch). The pinout is not the same as what a console port requires.
質問 # 22
Which type of Cisco console cable is used to connect a laptop to the console port on a Cisco router?
- A. rollover
- B. straight-through
- C. fiber
- D. crossover
正解：A
質問 # 23
What are the choices for modes of operation when deploying Cisco Catalyst 3850 Series switches?
- A. Active mode and Standby mode
- B. Install mode and Bundle mode
- C. Boot mode and Run mode
- D. Exec mode and User mode
正解：B
解説：
When deploying Cisco Catalyst 3850 Series switches, there are two modes of operation to choose from: Install mode and Bundle mode. Install mode is the default mode for the switch and uses a package-provisioning file named packages.conf to boot the switch. It allows for a more complete set of features and requires fewer resources upon boot1. Bundle mode, on the other hand, is similar to using traditional monolithic Cisco IOS images to boot the switch. It consumes more memory than Install mode because the packages are extracted from the bundle and copied to the RAM2. Cisco recommends using Install mode for operation due to its efficiency and feature set2.
質問 # 24
Which type of memory stores the decompressed form of Cisco IOS Software and the running configuration?
- A. DRAM
- B. flash
- C. NVRAM
- D. ROM
正解：A
解説：
The decompressed form of Cisco IOS Software and the running configuration are stored in DRAM (Dynamic Random-Access Memory) on Cisco devices. DRAM is used as the main memory for the device, where the operating system runs and the running configuration is stored. When a Cisco device boots up, the IOS image is decompressed and loaded into DRAM, and the running configuration is also held in this memory type. It's important to note that DRAM is volatile memory, which means its contents are lost when the device is powered off or restarted12. Reference := Maintaining System Memory Configuration Guide, Cisco IOS Release 15M&T - Cisco, Types of memory on a Cisco device - Study-CCNA
質問 # 25
What is the Windows-based program that executes the ping command to test network connectivity?
- A. cmd
- B. Find
- C. Start
- D. ipconfig
正解：A
質問 # 26
Which layer of the OSI model defines how data is formatted for transmission and how access to the physical media is controlled?
- A. data link
- B. presentation
- C. transport
- D. network
正解：A
解説：
The data link layer of the OSI model, which is Layer 2, defines how data is formatted for transmission and controls access to the physical media. This layer is responsible for the node-to-node delivery of data and handles error detection and correction from the physical layer. It also manages the way data packets are sent over the network, including the framing, addressing, and flow control. The data link layer ensures that messages are delivered to the proper device on a LAN using hardware addresses (MAC addresses) and translates messages from the network layer into bits for the physical layer to transmit Reference:
質問 # 27
What are two components of a WAN connection? (Choose two.)
- A. router
- B. CSU/DSU
- C. bridge
- D. switch
- E. hub
正解：A、B
解説：
A Wide Area Network (WAN) connection typically involves several components that work together to enable data communication over large distances. Two key components of a WAN connection are:
CSU/DSU (Channel Service Unit/Data Service Unit): This device acts as a gateway between the local area network (LAN) and the WAN. It converts the digital signals used in the LAN to the signals used in the WAN, which are often analog12.
Router: A router is used to connect multiple networks together and direct data traffic. In the context of a WAN, routers are responsible for determining the best path for data to travel across the network12.
質問 # 28
Which two pairs of LAN Ethernet devices use an RJ-45 straight-through cable? (Choose two.)
- A. switch-to-switch
- B. switch-to-router
- C. router-to-router
- D. switch-to-server
- E. switch-to-hub
正解：B、D
解説：
Section: Cisco Equipment and Related Hardware
質問 # 29
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