Simple routing table question
This is a simple question on the definition of routing tables. I will add a brief explanation.

Let's take the SALES router. It has two interfaces.

The interface top (65.21.1.2) is connected to the network 65.21.1.0/24.

The interface bottom (65.21.6.1) is connected to the network 65.21.6.0/23.

This can be expressed as the following routing table:

network          via        interface
---------------+-----------+---------
65.21.1.0/24     direct      top
65.21.6.0/24     direct      bottom


Now we have two research networks accessible via the router RESEARCH. This router has an ip address 65.21.1.3 on the network 65.21.1.0/24. This network is already in the routing table, so the traffic to the research networks can be routed with the following rules.

network          via        interface
---------------+-----------+---------
65.21.100.0/24   65.21.1.3   top
65.21.200.0/24   65.21.1.3   top


Finally the traffic to all other networks should be sent to the GATEWAY for further processing. Here is the final routing table.

network          via        interface
---------------+-----------+---------
65.21.1.0/24     direct      top
65.21.6.0/23     direct      bottom
65.21.100.0/24   65.21.1.3   top
65.21.200.0/24   65.21.1.3   top
default          65.21.1.1   top


The routing table for the RESEARCH router can be assembled following the same logic.