Modeling the Internet from the scratch: Link-layer, LAN, Switch - Code snippet: Build network-1

network.go

func Build() (host1 *link.Host, host2 *link.Host, host3 *link.Host,
    swch1 *link.Switch, swch2 *link.Switch) {
    // setup node
    host1 = link.NewHost()
    host2 = link.NewHost()
    host3 = link.NewHost()
    swch1 = link.NewSwitch()
    swch2 = link.NewSwitch()
}