Definition - What does Layer 3 mean?
Layer 3 refers to the third layer of the Open Systems Interconnection (OSI) Model, which is the network layer.
Layer 3 is responsible for all packet forwarding between intermediate routers, as opposed to Layer 2 (the data link layer), which is responsible for media access control and flow control, as well as error checking of Layer 1 processes.
Techopedia explains Layer 3
The protocols used in Layer 3 include:
- Internet Protocols IPv4/v6
- Internet Control Message Protocol (ICMP)
- Distance Vector Multicast Routing Protocol (DVMRP)
- Internet Group Management Protocol (IGMP)
- Address Resolution Protocol (ARP)
- Internet Protocol Security (IPsec)
- Routing Information Protocol (RIP)