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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