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Cisco 100-490試験は、ネットワークデバイスのインストール、設定、メンテナンス、トラブルシューティングなど、広範囲のトピックをカバーしています。ネットワークセキュリティ、ネットワークプロトコル、ネットワーク管理に関連するトピックも含まれています。
Cisco 100-490試験は、Ciscoルーティングとスイッチングネットワークデバイスをサポートする際に、ITプロフェッショナルの知識とスキルをテストするように設計されています。この試験は、ネットワーク技術者向けのエントリーレベルの認定プログラムであるCisco認定技術者ルーティングおよび切り替え認証の一部です。この試験では、Ciscoルーティングと切り替えデバイスをインストール、構成、保守、トラブルシューティングする候補者の能力を検証します。
Cisco 100-490試験は、ルーティングおよびスイッチング技術に関連する広範なトピックをカバーしています。これには、Ciscoルーターとスイッチの設定、VLANおよびルーティングプロトコルの実装、ネットワーク接続性の問題のトラブルシューティング、およびネットワークセキュリティの管理が含まれます。この試験は、これらのコンセプトの理解と、実世界のシナリオでそれらを適用する能力を候補者がテストすることを目的としています。
質問 # 40
Which command initiates the transfer of a Cisco IOS image over IP from ROMMON?
- A. tftpdnld
- B. copy flash: tftp:
- C. Xmodem
- D. copy tftp: flash:
正解：A
解説：
The tftpdnld command is specifically designed to initiate a TFTP (Trivial File Transfer Protocol) transfer of an image within ROMmon mode on a Cisco device. Here's why it's the correct answer:
ROMmon Functionality: ROMmon (Read-Only Memory Monitor) is a basic operating system mode used when the main Cisco IOS is unavailable. The tftpdnld command works from ROMmon to download a new IOS image.
TFTP Protocol: The tftpdnld command utilizes TFTP, which is a simple and reliable protocol commonly used for transferring Cisco IOS images.
Purpose: The command is used primarily for recovering corrupt images or upgrading to a different IOS version.
Why other options are incorrect:
Xmodem: XMODEM is an older and less reliable file transfer protocol that's less suitable than TFTP for Cisco IOS image transfers.
copy tftp: flash: This command format is used within the Cisco IOS itself, not in ROMmon mode.
copy flash: tftp: This command format would attempt to upload an image from flash memory to a TFTP server, instead of downloading an image.
質問 # 41
From a Windows command prompt, which command displays the local IP address of a computer?
- A. ipconfiguration
- B. ip configuration
- C. ipconfig
- D. ip config
正解：C
解説：
The ipconfig command in Windows is used to display and manage network configuration information for the local computer. Here's what it shows:
IP Address: The IPv4 address assigned to each network adapter.
Subnet Mask: The subnet mask used to determine the network segment.
Default Gateway: The IP address of the router used to send traffic to other networks.
Other Information: DNS servers, DHCP server details, and more.
Incorrect options:
ipconfiguration: This is not a recognized command in the Windows command prompt.
ip configuration: This is also not a recognized command.
ip config: While it might seem like it should work, Windows uses ipconfig without spaces.
How to use ipconfig:
Open the Windows command prompt (Search for 'cmd')
Type ipconfig and press Enter.
Reference:
Microsoft documentation on ipconfig: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/ipconfig
質問 # 42
The pins on an RJ-45 cable plug are numbered from 1 through 8. When the metal pins of the plug are facing toward you, pin 1 is the leftmost pin. Which two sets of pins are looped on an RJ-45 56K loopback plug? (Choose two.)
- A. pins 2 and 7
- B. pins 1 and 4
- C. pins 2 and 5
- D. pins 1 and 7
- E. pins 2 and 8
正解：D、E
解説：
Loopback plugs are used to test the physical connections and configurations of network equipment. In a 56K modem loopback plug, the following pins are looped to create a test signal:
Pins 1 and 7 (Transmit): Looping the transmit pins back to each other allows the device to test its own signal transmission.
Pins 2 and 8 (Receive): Looping the receive pins back to each other allows the device to test its ability to receive its own signal.
Understanding RJ-45 Wiring:
RJ-45 connectors are standardized and have a specific pinout for various applications like Ethernet networking and analog telephony connections. You can find resources online that show the standard RJ-45 color coding and pin assignments.
質問 # 43
Which two commands identify the serial number of a Cisco router? (Choose two.)
- A. show archive
- B. show version
- C. show environment
- D. show inventory
- E. show run
正解：B、D
解説：
The commands that can be used to identify the serial number of a Cisco router are show inventory and show version. The show inventory command provides detailed information about the hardware inventory, including the serial numbers of the device and its components1. The show version command displays the router's configuration, including the version of the operating system, the last reboot reason, and the hardware serial number, which is listed as the "Processor board ID" in the command output2. These commands are essential for network administrators to document and manage network equipment.
質問 # 44
When you deploy Cisco Catalyst 3850 Series switches, which two modes of operation can you choose from?
- A. Boot mode and Run mode
- B. Active mode and Standby mode
- C. Exec mode and User mode
- D. Install mode and Bundle mode
正解：D
解説：
Section: Cisco IOS Software Operation
質問 # 45
From the enable mode, which command loads the configuration during the password recovery process on a Cisco router?
- A. load_helper
- B. copy running-config startup-config
- C. copy startup-config running-config
- D. configure terminal
正解：C
解説：
Section: Service-related Knowledge
質問 # 46
Which two pairs of LAN Ethernet devices use an RJ-45 straight-through cable? (Choose two.)
- A. switch-to-switch
- B. router-to-router
- C. switch-to-server
- D. switch-to-hub
- E. switch-to-router
正解：C、E
質問 # 47
Which two ports on a laptop are used to gain console access to a Cisco switch? (Choose two.)
- A. RJ-11
- B. RJ-45 Ethernet
- C. USB
- D. DVI
- E. DB-9
正解：C、E
質問 # 48
Which two Cisco Nexus 3400 Series switches support 400-Gbps Ethernet ports? (Choose two.)
- A. Cisco Nexus 34200YC-SM
- B. Cisco Nexus 3432D-S
- C. Cisco Nexus 3408-S
- D. Cisco Nexus 34180YC
- E. Cisco Nexus 3464C
正解：B、C
解説：
The Cisco Nexus 3432D-S and Cisco Nexus 3408-S are part of the Cisco Nexus 3400 Series switches that support 400-Gbps Ethernet ports. The Cisco Nexus 3432D-S is designed with 32 ports of 400G, providing high-density and high-throughput capabilities1. The Cisco Nexus 3408-S offers flexibility with 100G or 400G Line-Card Expansion Modules (LEMs), allowing for configurations with 32 ports of 400G2. These switches are engineered for data centers requiring high performance, low latency, and power efficiency, with the Cisco Nexus 3432D-S offering industry-leading performance-per-watt power efficiency at low latency1.
質問 # 49
Which router port is used for dial-in access to the router for CLI management purposes and does not usually pass normal network traffic?
- A. channelized serial
- B. Fast Ethernet
- C. Gigabit Ethernet
- D. AUX
正解：D
解説：
The AUX (Auxiliary) port on a router is used for dial-in access for CLI (Command Line Interface) management purposes. It is typically connected to a modem and allows an administrator to dial into the router's CLI for remote management. This port is not used for passing normal network traffic, which differentiates it from other ports like Fast Ethernet or Gigabit Ethernet that handle regular data flow. The AUX port is specifically designed as a backup async port for management access1.
質問 # 50
How many pairs of copper wire does a UTP cable have?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
質問 # 51
Which two commands are valid for copying a saved configuration to RAM? (Choose two.)
- A. copy running-config startup-config
- B. copy running-config tftp
- C. copy tftp running-config
- D. copy startup-config running-config
- E. copy tftp startup-config
正解：C、D
解説：
Section: Service-related Knowledge
質問 # 52
Which set of steps best describes how to assign a static IP address to the Ethernet port on a computer?
- A. Click Start. Enter cmd and click OK. Enter the IP address XXX.XXX.XXX.XXX.
- B. From the Network and Sharing Center, double-click Local Area Connection. Select Properties > iPass Protocol (IEEE 802.1x) > Properties > Static IP.
- C. From the Network and Sharing Center, click Internet Protocol (TCP/IP), and follow the New Connection Wizard instructions.
- D. From the Network and Sharing Center, click Change adapter, then double-click a local area connection. Select Internet Protocol (TCP/IP) > Properties > Use the Following Address, and then configure the IP information.
正解：D
解説：
To assign a static IP address to the Ethernet port on a computer, particularly in a Windows environment, you would navigate to the Network and Sharing Center. From there, you would access the adapter settings, select your local area connection, and then enter the properties for Internet Protocol Version 4 (TCP/IPv4). Within the properties, you would choose the option to use a specific IP address and enter the desired IP information, including the IP address, subnet mask, and default gateway. This process sets a static IP address for the Ethernet port, ensuring that the computer will always use the same IP address every time it connects to the network, which is useful for various network configurations and applications. Reference := How to Assign a Static IP Address in Windows 10 or Windows 11 - How-To Geek, How to Set Up a Static IP Address | PCMag
質問 # 53
What is the correct IPv6 address notation?
- A. 2001:0DB8::/128
- B. 2001:0DB8::1:1:1:1:1
- C. 2001:0DB8:130F:0000:0000:7000:0000:140B
- D. 2001:0DB8:0::
正解：C
質問 # 54
Which protocol does TFTP typically use for transport?
- A. TCP
- B. RSVP
- C. HTTP
- D. UDP
正解：D
質問 # 55
Which Windows-based text editor is preferred for working with a simple text document, such as a Cisco configuration?
- A. Microsoft Notepad
- B. Microsoft Excel
- C. Microsoft Word
- D. Microsoft Access
正解：A
解説：
Microsoft Notepad is the preferred text editor for working with Cisco configuration files and other simple text documents for several reasons:
Plain Text Focus: Notepad is designed specifically for plain text editing. It does not add any formatting, hidden characters, or metadata that could interfere with the configuration file's structure.
Cisco Syntax Compatibility: Cisco configurations rely on specific syntax and spacing. Notepad preserves these elements accurately.
Universality: Notepad is a basic text editor included in all versions of Windows, ensuring accessibility and eliminating the need for additional software.
Why other options are not ideal:
Microsoft Word: Word is a word processor and includes formatting, fonts, and other features that are not compatible with Cisco configuration files. This formatting can corrupt the configuration.
Microsoft Access: Access is a database management system, not suited for text file editing.
Microsoft Excel: Excel is a spreadsheet application and adds its own structure and formatting that conflicts with configuration file formats.
質問 # 56 
Refer to the exhibit. Which two statements about the hardware components are true? (Choose two.)
- A. 2 is a USB 5-pin mini USB Type B to USB Type A console cable.
- B. 2 is an RJ-45 to USB Type A console cable.
- C. 3 is a USB 5-pin mini USB Type B port.
- D. 1 is a USB Type A port.
- E. 3 is a USB Type A port.
正解：A、E
解説：
Section: Cisco Equipment and Related Hardware
Explanation/Reference: https://www.cisco.com/c/en/us/td/docs/routers/access/2900/hardware/installation/guide/ Hardware_Installation_Guide/Install_Connect.html
質問 # 57
What 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. xmodem transfer command
- C. copy tftp flash: command
- D. tftp command
正解：A
解説：
The fastest way to recover a software version on a Cisco device that supports a USB flash port is by using the copy command with USB memory. This method allows for the direct transfer of the Cisco IOS image from a USB flash drive to the device's memory. It is significantly faster than using TFTP or Xmodem, which are slower due to network speed limitations and the inherent slowness of the Xmodem protocol, respectively. By using a USB flash drive, you can bypass these limitations and achieve a quicker recovery process
質問 # 58
Which two statements about a SmartJack are true? (Choose two.)
- A. It regenerates the signal to compensate for signal degradation from line transmission.
- B. It provides channel testing.
- C. It operates at Layer 2 of the OSI model.
- D. It provides signal conversion.
- E. It acts as a concentration point for dial-in and dial-out connections.
正解：A、D
解説：
Section: Cisco Equipment and Related Hardware
Explanation
質問 # 59
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