=OSI Model and Transmission Path=
 A.OSI 7-Layer Model
 B.Signals and Network Media
 C.Data Link Layer
 D.Bridges and Repeaters
 E.ARP and ARP tables
 F.Topologies and Access Methods
  Related Items
 F-1 Topologies
 F-2 Access Control Methods
 F-3 appendix The types of LAN
  ・ Exercise