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Cisco 100-490 Exam

Exam Name: Supporting Cisco Routing & Switching Network Devices
Exam Code: 100-490 RSTECH
Related Certification(s): Cisco Certified Technician Routing & Switching CCT Routing & Switching Certification
Certification Provider: Cisco
Actual Exam Duration: 90 Minutes
Number of 100-490 practice questions in our database: 72 (updated: Jun. 09, 2024)
Expected 100-490 Exam Topics, as suggested by Cisco :
  • Topic 1: Describe hardware memory common terms and their use in Cisco routers and switches/ Describe an IPv4 and IPv6 address and subnet
  • Topic 2: Perform software upgrade or downgrade using TFTP, FTP, xmodem, tftpdnld, or USB Storage/ Identify and describe commonly used components
  • Topic 3: Describe the location and process to change the configuration register parameter/ Describe the function of Telnet and SSH
  • Topic 4: Identify and locate the serial number of Cisco products/ Describe the function of FTP, TFTP and PING
  • Topic 5: Describe the basic functionality and key differences of this hardware: LAN switch, router, and wireless access points
  • Topic 6: Identify Cisco products by logo marking and model number/ Copy and paste a configuration file from/to a router or switch
  • Topic 7: Perform password recovery on a Cisco device/ Describe the licensing process on different platforms
  • Topic 8: Use and interpret the basic Cisco IOS Software commands/ Use the OSI and TCP/IP models and their associated protocols to explain how data flows in a network
  • Topic 9: Identify and correct common network problems at Layers 1 and 2/ Identify tools for hardware installation and replacement
  • Topic 10: Describe the key role of Cisco IOS, IOS-XE, IOS-XR and NX-OS software/ Navigate between different operating modes
Disscuss Cisco 100-490 Topics, Questions or Ask Anything Related

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Free Cisco 100-490 Exam Actual Questions

Note: Premium Questions for 100-490 were last updated On Jun. 09, 2024 (see below)

Question #1

What are two descriptions for FTP? (Choose two.)

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Correct Answer: B, E

1. It is built on a client-server model architecture and uses separate control and data connections between the client and the server2. Here are the explanations for the correct answers:

* B: The copy running-config ftp: command is used to copy the running configuration from a router to an FTP server or vice versa. This is a common method for backing up and restoring configurations on Cisco devices1.

* E: FTP typically requires authentication, which means a Cisco router acting as an FTP client must be configured with the appropriate username and password to access an FTP server. This ensures secure file transfer and access control1.

The other options are incorrect because:

* A: FTP is not used to load Cisco IOS Software to a router in ROMMON mode; this is typically done using TFTP or Xmodem.

* C: While a router can act as an FTP server, this is not a description of FTP itself.

* D: FTP uses TCP as its transport protocol, not UDP. FTP needs the reliability that TCP provides because it ensures the complete and accurate transfer of files1.


Question #2

To which value is the configuration register changed to bypass the loading of the startup configuration when performing a password recovery on a Cisco device?

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Correct Answer: D

The configuration register on Cisco devices controls how the device boots up. By changing the configuration register to 0x2142, you instruct the router to bypass the startup configuration file stored in NVRAM. This is crucial in the password recovery process because the passwords are stored in this configuration file.

Procedure for Password Recovery:

1. Break the boot sequence: Power cycle the router (turn off/on). During the boot process, send a 'Break' signal to get into ROMmon mode.

2. Change the configuration register: In ROMmon mode, type confreg 0x2142 and reload the router.

3. Boot without startup-config: The router will boot up, ignoring the saved startup configuration, allowing you to enter privileged EXEC mode without a password.

4. Change the password: Access configuration mode (configure terminal), and change the passwords as needed (enable password, enable secret, etc.).

5. Reset the configuration register: Set the configuration register back to its original value (usually 0x2102).

6. Save changes: Save the new configuration with copy running-config startup-config.


Question #3

What are two ways Telnet and SSH function? (Choose two.)

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Correct Answer: A, E

* 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.


Question #4

TFTP is a simple protocol for transferring files, such as a Cisco IOS or configuration file, from one device to another. Which device can be configured as a TFTP server?

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Correct Answer: C

Question #5

What is the primary method for recovering or upgrading a Cisco network device system image?

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Correct Answer: C


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