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CompTIA
Globally recognized entity that provides vendor neutral certifications in the IT Industry for entry level IT skills.
OSI Physical Layer
Catches ethernet frames as they come in and transfer them to different hosts. Uses preamble and Frame Check Sequence before sending to the next layer.
OSI Data Link Layer
Inspects incoming frames to see if they are addressed to the correct mac address.
OSI Network Layer
Monitors incoming packets and IP addresses
OSI Transport Layer
Assembles/disassembles different pieces of data as they come into 1500 byte pieces.