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Question 2 - 100-490 discussion

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Which Xmodem option is used to enhance error checking of an image that is copied to flash memory?

A.

-e

Answers
A.

-e

B.

-r

Answers
B.

-r

C.

-c

Answers
C.

-c

D.

-x

Answers
D.

-x

Suggested answer: C

Explanation:

The -c option in Xmodem file transfers is used to enable CRC (Cyclic Redundancy Check) for enhanced error checking. Here's why it's the correct answer:

Error Detection: CRC is a more robust error detection mechanism compared to the standard checksum method used in Xmodem. It provides greater reliability in identifying file corruption during the transfer.

Flash Memory: Since flash memory on a Cisco router or switch stores critical data like configuration files or the IOS image, ensuring the integrity of transferred files is crucial.

Why other options are incorrect:

-e, -r, -x: These are not standard Xmodem options for error checking purposes. While some implementations may have custom flags, they are not universally applicable.

Important Note: Xmodem is a legacy protocol that is often replaced by more reliable options like TFTP in modern Cisco devices. However, understanding Xmodem options is still relevant for certain cases or older equipment.

Xmodem overview: https://en.wikipedia.org/wiki/XMODEM

Cyclic Redundancy Check (CRC): https://en.wikipedia.org/wiki/Cyclic_redundancy_check

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asked 07/10/2024
Daniel Vong
42 questions
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