Which is true about routers and switches?
both control traffic between networks
both control traffic within a network
routers control traffic between networks while switches control traffic within a network
routers control traffic within a network while switches control traffic between networks

Routers control traffic between networks while switches control traffic within a network

Explanation:

Router and switches both are used to control the traffic. In local area network, different computer are connected with each other with in the organization or network. Switch is used to connect all the computers or devices in the local area network (LAN). The switch is responsible for connecting all the computers in the LAN and controlling the traffic within the LAN network.

On the other hand, Wide Area Network (WAN) is consist of multiple number of  Local Area Networks (LANs). To connect all the LAN router is used. Router is responsible for connecting all the networks in the WAN and also responsible for controlling traffic between different networks.

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that would be my answer.