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Cisco Certified Network Associate (CCNA) · Cisco
Drag & Drop Scenario
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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
The trickiest item is "provides reliability when loading an IOS image upon boot up" — this goes to TFTP, not because TFTP itself is reliable (it's UDP), but because it's the protocol Cisco devices specifically use during the boot/ROMMON process to load IOS images from a TFTP server. It is not FTP
Looks like everyone is wrong on this one. I double checked with google and chatgpt to make sure I had it correctly because none of it made any sense when I looked at it. Should be TCP Uses Ports 20 and 21 IOS Image UDP Uses Port 69 Does not require User Auth You always want the protocol FIRST to start the connection FIRST, THEN the port, etc.
TFTP provides reliability when loading an IOS image upon boot up. FTP can be used for IOS image transfers after the device has booted.