OSI Model

Thank goodness its done

What layer is Layer 1 of the OSI model?

Physical Layer

What layer is Layer 2 of the OSI model?

Data Link Layer

What layer is Layer 3 of the OSI model?

Network Layer

What layer is Layer 4 of the OSI model?

Transport Layer

What protocols operate at Layer 3?

IP, ICMP, OSPF, EIGRP

What protocols operate at Layer 4?

TCP, UDP

What does a router operate at?

Layer 3 (Network Layer)

What layer does a switch operate at?

Layer 2 (Data Link Layer) - though some switches can do Layer 3

What is the purpose of the Network Layer (Layer 3)?

Logical addressing (IP) and routing between networks

What is the purpose of the Transport Layer (Layer 4)?

End-to-end communication, reliability (TCP), and port numbers