The advertisement `10.1.0.0/16` covers all four listed networks from `10.1.100.0/24` through `10.1.103.0/24`.

### Why this is right A `/16` beginning at `10.1.0.0` covers addresses whose first two octets are `10.1`. Each of the four listed `/24` networks begins with those same two octets, so all are included. ### The concept A summary route can cover its intended routes while also covering additional address space. Here, `10.1.0.0/16` is broad enough to include the four `/24` networks, but it is not the smallest possible summary for just those four routes. A narrower `10.1.100.0/22` covers the contiguous range from third-octet 100 through 103. This distinction matters because a summary should be both correct and appropriately sized. ### Terms - **IP**: Internet Protocol. The addressing system used to identify network destinations. ### Remember A summary may cover the required routes and still be broader than necessary.