Network Layer (Layer 3)
- Responsible for moving messages from one node to another until destination is reached
- Maps logical addresses to physical addresses
- Address Resolution Protocol (ARP)
- IP adds own network layer header to segment or datagram
- Entire network layer message is called a packet
- IP addresses are used to identify hosts
- IP relies on several routing protocols
- Help find the best route for a packet to take
- Examples: ICMP, ARP
- Divides large packets into small packets
- Communicates between the transport layer and the data link layer
Computer Science Networking OSI Model