Final answer:
ISPs at the same level often engage in peering where they exchange messages without charging each other, which is cost-effective and improves performance.The statement is true.
Step-by-step explanation:
The statement that ISPs at the same level usually do not charge each other for exchanging messages is generally True. This practice is part of what is known as 'peering', where ISPs of similar network size and traffic exchange data without charging each other, with the aim of reducing costs and improving performance for their customers. This arrangement is beneficial because both parties save on the costs of sending data across another provider's network.