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OSI & TCP/IP Model Questions

in New CCNA 200-120 on May 13, 2014


Before installing a new, upgraded version of the IOS, what should be checked on the router, and which
command should be used to gather this information? (Choose two)
A. the amount of available ROM
B. the amount of available flash and RAM memory
C. the version of the bootstrap software present on the router
D. show version
E. show processes
F. show running-config

Correct Answer: BD

When upgrading new version of the IOS we need to copy the IOS to the Flash so first we have to check if the
Flash has enough memory or not. Also running the new IOS may require more RAM than the older one so we
should check the available RAM too. We can check both with the “show version” command.

At which layer of the OSI model does PPP perform?
A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 5

Correct Answer: A


A network administrator is verifying the configuration of a newly installed host by establishing an FTP
connection to a remote server. What is the highest layer of the protocol stack that the network administrator is
using for this operation?

A. application
B. presentation
C. session
D. transport
E. internet
F. data link

Correct Answer: A

FTP belongs to Application layer and it is also the highest layer of the OSI model.

At which layer of the OSI model is RSTP used to prevent loops?
A. data link
B. network
C. physical
D. transport

Correct Answer: A

A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is
then discarded. At which OSI layer did this happen?
A. session
B. network
C. physical
D. data link
E. transport

Correct Answer: D

Which command encrypts all plaintext passwords?
A. Router# service password-encryption
B. Router(config)# password-encryption
C. Router(config)# service password-encryption
D. Router# password-encryption

Correct Answer: C

Refer to the exhibit. Why is flash memory erased prior to upgrading the IOS image from the TFTP server?
Router# copy tftp flash
Address or name of remote host []?
Source filename []? c1600-k8sy-mz.123-16a.bin
Destination filename [c1600-k8sy-mz.123-16a.bin]?
Accessing tftp:// c1600-k8sy-mz.l23-16a.bin:
Erasing flash before copying? [confirm] Erasing the flash filesystem will remove all files! continue? [confirm] Erasing device
Eeeeeeeeeeeeeeeeeeeeeeeeeeeeeee :erased
Erase of flash: complete
Loading c1600-k8sy-mz.l23-16a.bin from (via Ethernet0):
[OK – 6888962/13777920 bytes] verifying checksum: OK (0x7BF3)
6888962 bytes copied in 209.920 secs (32961 bytes/sec)
A. The router cannot verify that the Cisco IOS image currently in flash is valid
B. Flash memory on Cisco routers can contain only a single IOS image.
C. Erasing current flash content is requested during the copy dialog.
D. In order for the router to use the new image as the default, it must be the only IOS image in flash.

Correct Answer: C

During the copy process, the router asked “Erasing flash before copying? [confirm]” and the administrator
confirmed (by pressing Enter) so the flash was deleted.
Note: In this case, the flash has enough space to copy a new IOS without deleting the current one. The current
IOS is deleted just because the administrator wants to do so. If the flash does not have enough space you will
see an error message like this:
%Error copying tftp:// c1600-k8sy-mz.l23-16a.bin (Not enough space on device)


Categories: New CCNA 200-120

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