$1.$ IPv$4$ subnetting is a key skill required for anyone wishing to become a Network Administrator. There are countless online resources available to help practice your subnetting skills. Research, identify, and describe such a resource. Explain what's useful about it and be sure to include a link. Try to find one that none of your classmates have. Include a screenshot of the online resource running in the browser window on your desktop with your name, class$/$section number, and semester $($i$.$e$.$ Fall $23)$ clearly visible and legible.

$2.$ The OSI and TCP$/$IP models have formed the foundation of modern networking for over $40$ years. Will they remain so $10$ years from now? How about $50?$ What accounts for the the longevity of the models? Find and cite at least one online source that backs up your assessment.