Physical Layer: 802.3, 802.5, 802.11, 802.15, 802.16, 802.17

Data Link Layer: 802.1 bridging, 802.2 logic link

IEEE Std 802

802	Overview and Architecture.
802.1B	Lan/Man Management.
802.1D	Media Access Control Bridges.
802.1E	System Load Protocol.
802.1F	Common Definitions and Procedures for IEEE 802 Management Information.
802.1G	Remote Media Access Control Bridging.
802.1H	Recommended Practice for Media Access Control Bridging of Ethernet V2.0 in IEEE 802 Local Area Networks.
802.1Q	Virtual Bridged Local Area Networks. Defines an architecture for Virtual Bridged LANs, the services provided in Virtual Bridged LANs, and the protocols and algorithms involved in the provision of those services.
802.2	Logical Link Control.
802.3	CSMA/CD Access Method and Physical Layer Specifications.
802.5	Token Ring Access Method and Physical Layer Specifications.
802.10	Standard for Interoperable LAN Security (SILS). Currently approved: Secure Data Exchange(SDE).
802.11	Wireless LAN Medium Access Control Sublayer and Physical Layer Specifications.
802.15	Wireless Medium Access Control and Physical Layer Specifications for: Wireless Personal Area Networks.
802.16	Standard Air Interface for Fixed Broadband Wireless Access Systems.
802.17	Resilient Packet Ring Access Method and Physical Layer Specifications.

Bridging and Switching

Protocol Suites:

ICMP, IGP, EGP, BGP, IGMP, OSPF, RIP V1/V2, 

Reference: 

Protocol Stacks in Relationship to the OSI Model

Network Protocol Categories

Knowledge of switches, routers and L2/L3 networking protocols is essential (IP, TCP, DHCP, ARP, Ethernet, QoS, multicast, etc)

IMAP

MIME

NNP

GOPHER

Tech: VLAN, QOS, NAT,DHCP, NAT,