An Introduction to 안전놀이터

https://www.evernote.com/shard/s592/sh/3c319365-ab5f-4833-9b63-aa517b9a2526/7b8123186bb99f3e574e0bf8640f69f1

The bottom layer in the TCP/IP design. Its undertaking is to supply entry to the transmission Actual physical medium and it differs based on the implementation from the medium.