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Cisco 100-490 Practice Test - Questions Answers, Page 8

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Which Xmodem option enhances error checking of an image copied to flash memory?
From the enable mode, which command loads the configuration during the password recovery process on a Cisco router?
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?
Which device is able to be configured as a TFTP server?
What are two purposes of a USB thumb drive? (Choose two.)
Which protocol does TFTP typically use for transport?
Which two pieces of information are displayed when the show ip interface brief command is used? (Choose two.)
Which type of port is used to connect a laptop to an Ethernet port on a Cisco router?
How are IPv6 addresses notated?
Which two features are associated with single-mode fiber-optic cable? (Choose two.)

Question 71

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Which Xmodem option enhances error checking of an image copied to flash memory?

A.

-c

A.

-c

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B.

-e

B.

-e

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C.

-r

C.

-r

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D.

-x

D.

-x

Answers
Suggested answer: B

Explanation:

The Xmodem option that enhances error checking when copying an image to flash memory is the -e option. This option enables error checking to ensure the integrity of the file being transferred. Xmodem is a protocol that uses checksums or cyclic redundancy checks (CRC) to detect errors during the transfer. The -e option specifically invokes CRC error checking, which is more reliable than the basic checksum method, providing an additional layer of verification that the copied image is free from errors. Reference := The information is based on standard practices for using the Xmodem protocol for file transfers in networking devices, as outlined in Cisco's documentation and support forums1.

Question 72

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How are IPv6 addresses notated?

A.

2001:ODB8::1:1:1:1:1

A.

2001:ODB8::1:1:1:1:1

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B.

2001:0DB8:130F:0000:0000:7000:0000:140B

B.

2001:0DB8:130F:0000:0000:7000:0000:140B

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C.

2001:0DB8:0::

C.

2001:0DB8:0::

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D.

2001:0DB8::/128

D.

2001:0DB8::/128

Answers
Suggested answer: B

Explanation:

IPv6 addresses are 128 bits in length and are written as eight groups of four hexadecimal digits. Each group is separated from the others by colons (:). The correct notation for IPv6 addresses allows for the omission of leading zeros within each block of four hexadecimal digits and the use of double colons (::) to represent consecutive blocks of zeros. However, the double colons can only be used once in an address to ensure proper expansion to the full 128 bits. Option B is the only choice that correctly represents a full IPv6 address without any abbreviation.Options A and C use double colons incorrectly, and option D represents a prefix length rather than a full address.Reference:= The information is based on standard IPv6 address notation practices, which include the representation of addresses in hexadecimal format and the rules for abbreviating zeros1

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