 | Problem is to convert textual machine name to its numeric IP address (to send to it) | e.g. www.apple.com corresponds to a numeric IP address that looks like 192.60.196.3 |
| Solution is DNS: Domain Name Service | on each machine: if you don’t know an IP address, at least know who to ask (via TCP/IP) | upper-level apps use DNS at will (e.g. browser) | |
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