Timy wants to ensure that his web servers can scale horizontally during traffic increases, while also allowing them to be patched or upgraded without causing outages. What type of network device should he deploy?

Network load balancers are designed to distribute traffic among various systems, making it possible to add or remove systems as needed. This allows for easier patching and upgrades by draining connections from systems and removing them from the pool temporarily while maintenance is performed. Additionally, load balancers can help monitor system performance and report on issues, ensuring that loads are balanced among the systems to match their capabilities. Firewalls are primarily used for security purposes, while switches are network devices that facilitate the transfer of traffic to the appropriate system. It's worth noting that the term "horizontal scaler" was not used in this context.