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  1. Home
  2. Cisco Certification
  3. 100-490 Exam
  4. Cisco.100-490.v2024-10-28.q60 Dumps
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Question 21

Which two commands are valid for copying a saved configuration to RAM? (Choose two.)

Correct Answer: A,C
Section: Service-related Knowledge
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Question 22

Which two features are associated with single-mode fiber-optic cable? (Choose two.)

Correct Answer: A,C
Section: Cisco Equipment and Related Hardware
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Question 23

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?

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.
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Question 24

Which protocol does TFTP typically use for transport?

Correct Answer: D
TFTP, or Trivial File Transfer Protocol, is a simple protocol used for transferring files. Unlike other file transfer protocols, TFTP operates on top of the User Datagram Protocol (UDP), which is a connectionless protocol. This means that TFTP does not establish a persistent connection between the client and server, and it does not guarantee reliable delivery of packets, error checking, or correction. TFTP is typically used in scenarios where simplicity and minimal memory footprint are more critical than the need for reliable delivery, such as when booting a device over a network123. Reference := Wikipedia, GeeksforGeeks, PyNet Labs
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Question 25

Which two Cisco Nexus 9300 Series switches support 400-Gbps Ethernet ports? (Choose two.)

Correct Answer: A,C
The Cisco Nexus 9300 Series switches are a family of high-performance data center switching products. However, only a specific subset of models within this series supports 400-Gbps Ethernet ports.
Based on the information available online, two models from the Cisco Nexus 9300 Series that offer 400-Gbps Ethernet ports are:
Cisco Nexus 9316D-GX: This is a 1RU fixed switch that provides 16 ports of 400 Gbps (QSFP-DD) with a non-blocking switch architecture. It's suitable for aggregation, core, or spine applications.
Cisco Nexus 93600CD-GX: This is also a 1RU fixed switch, but it offers a combination of ports. It includes 28 ports of 100G and 8 ports of 400 Gbps (QSFP-DD) with a non-blocking switch architecture. This model is well-suited for data center Top-of-Rack (ToR), End-of-Row (EoR), and collapsed aggregation and access deployments, particularly when used with Cisco Nexus 2000 Fabric Extenders.
Reference:
Cisco Nexus 9000 Series 400G Deployment Guide
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