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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