Physical Layer: Hub, Repeater, Media Converter, Cable/connector, Bluetooth / NFC, Bits, AP (transmitter), Data Link Layer: MAC table / ARP / RARP, Bridge / AP, NIC (addressing), VLAN / STP, Frames, Network Layer: IP/IPsec, IDS/IPS, ICMP, OSPF/RIP, Routers, Packets, Transport Layer: TCP / UDP, Firewall Device (Stateful Inspection), L4 Load Balancer , Buffering/Windowing, Segment, Session Layer: SIP, NetBIOS, NFS, RPC, SMB, Presentation Layer: TLS / SSL, JPEG, IMG, GIF, ASCII/EBCDIC, Application Layer: UPnP , DHCP , DNS , SSH/SFTP/SCP/Telnet, NTP/PTP, SNMP, Proxy Server (caching, filtering, security),

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