{
    "nodes": [
        {
            "name": "r1",
            "type": "router"
        },
        {
            "name": "r2",
            "type": "router"
        },
        {
            "name": "h1",
            "type": "host"
        },
        {
            "name": "h2",
            "type": "host"
        },
        {
            "name": "h3",
            "type": "host"
        }
    ],
    "networks": [
        {
            "name": "r1-hosts",
            "links": [
                "h1",
                "r1"
            ]
        },
        {
            "name": "r1-r2",
            "links": [
                "r1",
                "r2"
            ]
        },
        {
            "name": "r2-hosts",
            "links": [
                "r2",
                "h2",
                "h3"
            ]
        }
    ]
}