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Cisco Certification
100-490 Exam
Cisco.100-490.v2024-10-28.q60 Dumps

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Question 6

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

A.USB storage
B.FTP
C.the tftpdnld command
D.the xmodem command

Correct Answer: C

The tftpdnld command in Cisco IOS is specifically designed for recovering or upgrading a system image. Here's how it's the most effective method:
Purpose: The tftpdnld command directly initiates a TFTP download of a new system image and stores it in memory. This is ideal for replacing a corrupt image or upgrading to a newer version of Cisco IOS.
ROMmon: The tftpdnld command can often be used from ROMmon mode, which is essential when the existing image is unusable.
Efficiency: It streamlines the image transfer process specifically using TFTP, which is commonly used for Cisco IOS images.
Why other options are less ideal:
USB storage: While some newer Cisco devices may allow direct loading of an IOS image from USB, this isn't universally supported and often requires specific boot commands.
FTP: FTP (File Transfer Protocol) can be used for file transfers, but it's not as commonly used as TFTP in the context of Cisco IOS image recovery. The tftpdnld command offers a more tailored solution for this purpose.
the xmodem command: XMODEM is a legacy file transfer protocol that is slower and less reliable than TFTP, especially for larger files like Cisco IOS images.

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Question 7

What are two standard fiber-optic connectors? (Choose two.)

A.subscriber
B.Lucent
C.crossover
D.rollover
E.multidimension

Correct Answer: A,B

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Question 8

Which two statements about Telnet and SSH are true? (Choose two.)

A.SSH is a protocol that provides a secure remote access connection to network devices.
B.SSH uses the well-known TCP port 23 for its communication.
C.A Telnet network management connection is dropped when a router reboots.
D.Telnet is a protocol that provides a secure remote access connection to network devices.
E.Telnet is preferred over SSH for security reasons.

Correct Answer: A,C

A . Correct. SSH, or Secure Shell, is indeed a protocol that provides a secure remote access connection to network devices. It encrypts the data to ensure secure transmission over insecure networks like the internet1.
C . Correct. Telnet connections are not secure and are terminated when a router reboots. This is because Telnet does not have any mechanism to maintain the connection in case of network interruptions or device reboots1.
B, D, and E are incorrect because: B. SSH uses TCP port 22 by default, not port 23, which is used by Telnet1. D . Telnet does not provide a secure connection; it transmits data in plain text, which can be intercepted easily1. E. SSH is preferred over Telnet for security reasons because it provides encrypted connections and authentication mechanisms, which Telnet does not1.
Reference :=
1: GeeksforGeeks - Difference between SSH and Telnet 2: phoenixNAP - Telnet vs. SSH: How Is SSH Different From Telnet? 3: Guru99 - Telnet vs SSH - Difference Between Them 4: Difference Between - Difference Between Telnet and SSH

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Question 9

Which device is a DTE device?

A.CSU/DSU
B.router
C.cable modem
D.DSL modem

Correct Answer: B

A DTE (Data Terminal Equipment) device is an end instrument that converts user information into signals or reconverts received signals. In the context of networking, a router can be considered a DTE device because it is typically at the user end of a user-network interface and serves as a data source or destination. It communicates with the data circuit-terminating equipment (DCE), such as a modem, to send and receive data across the network345.

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Question 10

Which Cisco CPAK 100GBASE module supports Multimode Fiber cable?

A.Cisco CPAK-100G-CWDM4
B.Cisco CPAK-100G-LR4
C.Cisco CPAK-100G-ER4L
D.Cisco CPAK-100G-SR4

Correct Answer: D

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

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