In what format was the routing configuration? What tables were there?

Routing configuration is usually represented in the form of routing tables, where each entry contains information about the destination network, subnet mask, gateway (next hop), interface, and metric.

Main routing tables:

• Routing Table — contains the primary routes for packet forwarding.
• ARP Table (Address Resolution Protocol) — maps IP addresses to MAC addresses on the local segment.
• Policy Routing Table — used for special routing rules, for example, based on source or traffic type.

The configuration format can be presented as text files with entries, JSON, YAML, or as objects in memory, depending on the system. For example, in Linux, the command ip route show displays the routing table in text format.