{
    "nodes": [
	{
	    "name": "r1",
	    "type": "router"
	},
	{
	    "name": "r2",
	    "type": "router"
	},
	{
	    "name": "r3",
	    "type": "router"
	},
	{
	    "name": "r4",
	    "type": "router"
	},
	{
	    "name": "r5",
	    "type": "router"
	},
	{
	    "name": "h1",
	    "type": "host"
	},
	{
	    "name": "h2",
	    "type": "host"
	}
    ],
    "networks": [
	{
	    "name": "r1-hosts",
	    "links": [
		"h1",
		"r1"
	    ]
	},
	{
	    "name": "r1-r2",
	    "links": [
		"r1",
		"r2"
	    ]
	},
	{
	    "name": "r2-r3",
	    "links": [
		"r2",
		"r3"
	    ]
	},
	{
	    "name": "r1-r4",
	    "links": [
		"r1",
		"r4"
	    ]
	},
	{
	    "name": "r4-r5",
	    "links": [
		"r4",
		"r5"
	    ]
	},
	{
	    "name": "r5-r3",
	    "links": [
		"r5",
		"r3"
	    ]
	},
	{
	    "name": "r3-hosts",
	    "links": [
		"r3",
		"h2"
	    ]
	}
    ]
}