10 Things Steve Jobs Can Teach Us About 안전공원
https://www.evernote.com/shard/s592/sh/8c63a0cd-fa49-4bc7-a296-e8314350248f/49333a831a47a261b13749b750b2fc58
The lowest layer with the TCP/IP design. Its task is to deliver use of the transmission physical medium and it differs according to the implementation of the medium.