At the center of this figure is a link-layer switch with six connections extending from all sides. Connection 1 extends diagonally downward to the left into a second link-layer switch. The line between them is identified as "100 Mbps (fiber)." This second link-layer switch connects to a network of computers labeled "Electrical Engineering."

Connection 2 extends vertically downward into a third link-layer switch. The line is similarly identified as 100 Mbps (fiber), and the switch similarly connects to a network of computers, this one labeled "Computer Science." The lines between the switch and the computers are identified as "Mixture of 10 Mbps, 100 Mbps, 1 Gbps, Cat 5 cable."

Connection 3 extends diagonally downward to the right and into a fourth link-layer switch. The line between them is similarly identified as 100 Mbps (fiber), and this switch similarly connects to a network of computers, this one labeled "Computer Engineering."

Connection 4 extends horizontally to the right and into a server. The line between them is identified as "1 Gbps," and the server is labeled "Mail server."

Connection 5 extends diagonally upward to the right and into a second server. The line between them is 1 Gbps and the server is labeled "Web server."

Connection 6 extends diagonally upward to the left and into a router. The line is identified as "1 Gbps." A second line extends from the router horizontally to the left and to the external Internet.