Lecture 1 Introduction. Basic Concepts.
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Fully connected mesh topology (for five devices)
Q: How many links are needed for a full mesh network with 20 nodes?
The physical layer is responsible for transmitting individual bits from one node to the next.
The data link layer is responsible for transmitting frames from one node to the next.
The network layer is responsible for the delivery of packets from the original source to the final destination.
The transport layer is responsible for delivery of a message from one process to another.
The application layer is responsible for providing services to the user.
NSFNET structure initiated in 1994 to merge the academic and commercial networks.