> For the complete documentation index, see [llms.txt](https://jncia-workbook.gitbook.io/workbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jncia-workbook.gitbook.io/workbook/junos-switching/topology.md).

# Topology

<figure><img src="/files/bwmytONHlKuu4x3Yb7WT" alt=""><figcaption></figcaption></figure>

The four hosts are simulated as separate virtual-instances on the single node called HOST-RTR. You will need to add `routing-instance host<#>` to pings. For example, to ping 10.0.100.103 from host1 use `ping 10.0.100.103 routing-instance host1`.