Check the Available 100-490 Exam Dumps with 74 QA's UPDATED 2025
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Cisco 100-490 exam is recognized as a valuable certification for networking professionals. It is a globally recognized certification and is highly respected in the industry. Passing the exam signifies that the candidate has the knowledge and skills required to support and maintain Cisco routing and switching network devices, which can lead to increased job opportunities and higher salaries.
NEW QUESTION # 23
Which Xmodem option is used to enhance error checking of an image that is copied to flash memory?
- A. -x
- B. -r
- C. -e
- D. -c
Answer: D
Explanation:
Section: Service-related Knowledge
Explanation/Reference:
NEW QUESTION # 24
Which Cisco CPAK 100GBASE module supports Multimode Fiber cable?
- A. Cisco CPAK-100G-ER4L
- B. Cisco CPAK-100G-LR4
- C. Cisco CPAK-100G-SR4
- D. Cisco CPAK-100G-CWDM4
Answer: C
Explanation:
Reference:
https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/ data_sheet_c78-728110.html
NEW QUESTION # 25
What are two purposes of a USB thumb drive? (Choose two.)
- A. to increase system memory size
- B. to copy IOS images to and from a PC
- C. to copy configuration files to and from a PC
- D. to save router hardware information
- E. to save the system log
Answer: B,C
Explanation:
USB thumb drives (also called flash drives) serve several practical purposes in networking:
File Transfer: They are excellent for transferring Cisco router or switch configuration files between the device and a PC. This allows you to back up configurations, easily restore configurations, or work with them offline.
IOS Image Storage: USB thumb drives are convenient for storing and transferring Cisco IOS images, especially when you need to upgrade or recover network devices.
Why other options are incorrect:
to save the system log: While you might temporarily store log files on a USB drive, routers and switches generally utilize internal memory or a remote syslog server for logging purposes.
to save router hardware information: Hardware inventory information obtained from commands like show inventory is often copied and pasted to text files, which can then be stored on a USB drive. However, the drive itself doesn't directly save or store this hardware information.
to increase system memory: USB drives are not designed to act as additional system memory (RAM) for a router or switch.
NEW QUESTION # 26
Which command displays a list of file systems that are available on Cisco devices?
- A. show version
- B. show file system
- C. show directory
- D. show memory
Answer: B
Explanation:
Section: Cisco IOS Software Operation
NEW QUESTION # 27
Which type of memory is used to store Cisco IOS Software permanently?
- A. NVRAM
- B. SRAM
- C. flash
- D. DRAM
Answer: C
Explanation:
The type of memory used to store Cisco IOS Software permanently is flash memory. Flash memory is non-volatile, meaning it retains its content even after the device is powered down or restarted. It is commonly used in Cisco devices to store one or more Cisco IOS software images, as well as other files such as backup configuration files. This allows the device to reload the operating system after a reboot without the need to retransfer the IOS image
NEW QUESTION # 28
Which two commands are valid for copying a saved configuration to RAM? (Choose two.)
- A. copy running-config startup-config
- B. copy startup-config running-config
- C. copy running-config tftp
- D. copy tftp running-config
- E. copy tftp startup-config
Answer: B,D
Explanation:
Section: Service-related Knowledge
NEW QUESTION # 29
What are two ways Telnet and SSH function? (Choose two.)
- A. SSH is a protocol that provides a secure remote access connection to network devices.
- B. A Telnet network management connection is dropped when a router reboots.
- C. Telnet is preferred over SSH for security reasons.
- D. SSH uses the well-known TCP port 23 for its communication.
- E. Telnet is a protocol that provides a secure remote access connection to network devices.
Answer: A,B
Explanation:
* A. SSH...secure remote access: This is correct. SSH (Secure Shell) is designed specifically for secure remote access. It utilizes strong encryption to protect data transmissions, including login credentials and commands.
* B. Telnet...secure remote access: This is incorrect. Telnet is inherently insecure as it transmits all data, including sensitive passwords, in cleartext.
* C. SSH uses...TCP port 23: This is incorrect. SSH uses TCP port 22 by default, while Telnet uses TCP port 23.
* D. Telnet preferred...security reasons: This is incorrect. SSH is vastly preferred over Telnet due to its strong security features.
* E. Telnet connection...router reboots: This is correct. Telnet connections are not persistent, so a router reboot disrupts them. This re-enforces their lack of suitability for critical management tasks.
Key Points:
* Security: SSH is the recommended protocol for remote access to network devices due to its strong encryption and authentication mechanisms.
* Persistence: Telnet connections are temporary and get disrupted on events like router reboots.
NEW QUESTION # 30
Which type of memory stores the configuration of a router or switch by default?
- A. NVRAM
- B. RAM
- C. ROM
- D. flash
Answer: B
Explanation:
Section: Cisco Equipment and Related Hardware
NEW QUESTION # 31
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. Gigabit Ethernet
- B. Fast Ethernet
- C. AUX
- D. channelized serial
Answer: C
Explanation:
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.
NEW QUESTION # 32
Which bits represent the boot field in the configuration register value?
- A. lowest four bits
- B. highest two bits
- C. highest four bits
- D. lowest two bits
Answer: A
NEW QUESTION # 33
Which two features are associated with single-mode fiber-optic cable? (Choose two.)
- A. operates over less distance than multimode fiber
- B. costs less than multimode fiber
- C. consists of a single strand of glass fiber
- D. carries a higher bandwidth that multimode fiber
- E. has higher attenuation that multimode fiber
Answer: C,D
Explanation:
The features associated with single-mode fiber-optic cable include:
Consists of a single strand of glass fiber: Single-mode fiber uses a single core (strand) of glass fiber to transmit light signals. This core is thinner than that of multimode fiber, allowing for greater transmission distances.
Carries a higher bandwidth than multimode fiber: Single-mode fiber can carry higher data rates over longer distances compared to multimode fiber. It is commonly used in long-haul communication links and high-speed networks.
Reference:
Single-mode vs. Multimode Fiber
Fiber Optic Cable Types
NEW QUESTION # 34
Cisco NX-OS has added the ability to use which type of custom scripting to help manage user networks?
- A. Collective
- B. Python
- C. C++
- D. SQL
Answer: B
Explanation:
Section: Cisco IOS Software Operation
NEW QUESTION # 35
How many pairs of copper wire does a UTP cable have?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 36
Which set of steps best describes how to assign a static IP address to the Ethernet port on a computer?
- A. 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.
- B. From the Network and Sharing Center, click Internet Protocol (TCP/IP), and follow the New Connection Wizard instructions.
- C. From the Network and Sharing Center, double-click Local Area Connection. Select Properties > iPass Protocol (IEEE 802.1x) > Properties > Static IP.
- D. Click Start. Enter cmd and click OK. Enter the IP address XXX.XXX.XXX.XXX.
Answer: A
NEW QUESTION # 37
Which two ports on a laptop are used to gain console access to a Cisco switch? (Choose two.)
- A. DB-9
- B. RJ-45 Ethernet
- C. RJ-11
- D. DVI
- E. USB
Answer: A,E
Explanation:
Section: Cisco Equipment and Related Hardware
NEW QUESTION # 38
Which type of memory is erased on a Cisco device when rebooted?
- A. NVRAM
- B. DRAM
- C. flash
- D. PVDM
Answer: B
Explanation:
DRAM, or Dynamic Random-Access Memory, is the type of memory that is erased when a Cisco device is rebooted. DRAM is used to store the running configuration and routing tables of the device. Since DRAM is volatile memory, its contents are lost when the device is powered down or restarted. This is in contrast to non-volatile memory types like flash and NVRAM, which retain their contents even after a reboot1. Reference := Types of memory on a Cisco device - Study-CCNA
NEW QUESTION # 39
Which Windows-based text editor is preferred for working with a simple text document, such as a Cisco configuration?
- A. Microsoft Access
- B. Microsoft Excel
- C. Microsoft Word
- D. Microsoft Notepad
Answer: D
Explanation:
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.
NEW QUESTION # 40
Which command displays information about the carrier network, cell site, and available service?
- A. show cellular unit profile
- B. show cellular unit network
- C. show cellular unit hardware
- D. show cellular unit radio
Answer: B
Explanation:
Reference:
https://www.cisco.com/c/en/us/td/docs/solutions/Verticals/EE/IG-WAN/EE-WAN-IG/EE-WAN- IGch2.html
NEW QUESTION # 41
Which Cisco CPAK 100GBASE module supports Multimode Fiber cable?
- A. Cisco CPAK-100G-ER4L
- B. Cisco CPAK-100G-LR4
- C. Cisco CPAK-100G-SR4
- D. Cisco CPAK-100G-CWDM4
Answer: C
Explanation:
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
NEW QUESTION # 42
What is the primary method for recovering or upgrading a Cisco network device system image?
- A. FTP
- B. USB storage
- C. the tftpdnld command
- D. the xmodem command
Answer: C
NEW QUESTION # 43
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::
Answer: C
Explanation:
The correct IPv6 address notation follows the format of eight groups of four hexadecimal digits, separated by colons. The address must have exactly eight groups unless it uses the double colon (::) to represent consecutive groups of zero value. The double colon can only appear once in an address to avoid ambiguity.
Option A is incorrect because it includes a subnet mask (/128) which is not part of the actual address notation. Option B is incomplete as it does not contain enough groups and ends with a single colon. Option C has too many groups (nine instead of eight) and is therefore not a valid IPv6 address. Option D is the correct notation with eight groups of four hexadecimal digits, where necessary leading zeros are included.
Reference:
IPv6 Address Types, Notation, and Structure Explained1.
IPv6 address formats - IBM2. =========================
NEW QUESTION # 44
Which two commands are valid for copying a saved configuration to RAM? (Choose two.)
- A. copy running-config startup-config
- B. copy startup-config running-config
- C. copy running-config tftp
- D. copy tftp running-config
- E. copy tftp startup-config
Answer: B,D
Explanation:
The commands to copy a saved configuration to RAM on Cisco devices are:
copy startup-config running-config: This command is used to copy the startup configuration (saved configuration) into the running configuration (current configuration in RAM). It is typically used when you want to restore the device to a previously saved configuration after changes have been made1.
copy tftp running-config: This command allows you to copy a configuration file from a TFTP server directly into the running configuration of the device. It's useful for applying a new configuration or for restoring a configuration from a backup located on a TFTP server1.
The other options listed are not valid for copying a saved configuration to RAM:
copy running-config startup-config copies the current running configuration to the startup configuration, which is the opposite of what's asked.
copy running-config tftp is used to save the running configuration to a TFTP server, not to copy to RAM.
copy tftp startup-config would copy a file from a TFTP server to the startup configuration, not to the running configuration in RAM.
NEW QUESTION # 45
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Career Prospects
Passing the Cisco 100-490 exam takes you closer to obtaining the Cisco Certified Technician Routing & Switching certification, which is the main validation of your in-depth expertise in the Cisco networking equipment. After earning this certificate, you can explore a wide range of employment opportunities. The certified professionals can follow the career paths of an Engineer (network, field, application & support) or a Systems Administrator. The CCT Routing & Switching certification can also open doors to higher remuneration. According to PayScale.com, the average income of a Field Engineer amounts to $64,142 per year. Holding the position of an Application & Support Engineer, you can earn an average of $71,506 per annum.
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