When you send a file to a colleague over you can be reasonably assured that the person receiving your file is the same person you intended to receive it. the internet a secure internal network a local area network (lan) wide area network (wan)?

When you send a file to a colleague over a secure internal network, you can be reasonably assured that the person receiving your file is the same person you intended to receive it.

a secure internal network

Rest other networks are vulnerable to hacks and viruses.

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