About this interactive
File permissions and access control lists between networks do not stop someone who gets onto a network segment from probing every machine on it. That is why network access is controlled at the LAN itself, as one more layer of defense in depth.
There are two ways onto a network. Direct access puts a device on the network itself: a cable into a switch port, or a connection to the wireless network. Wireless counts as direct even from the parking lot, because the device joins the same network, and its signal is in the air for anyone in range.
Remote access arrives from somewhere else. The user builds a VPN tunnel, TLS or IPsec, over the internet, or remotes into a machine inside with SSH or RDP and works from there. To sort a card, ask where the device is joined: to the office network itself, or to a tunnel or session that carries it in.
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