Final answer:
The most common feature of SOHO routers is a built-in firewall, designed to safeguard the network by filtering traffic and blocking threats. SOHO routers also commonly offer Wi-Fi, NAT, and DHCP functionalities.
Step-by-step explanation:
A common feature that is part of most routers used for small office/home office (SOHO) applications is a built-in firewall. This security feature is designed to protect the network by filtering incoming and outgoing traffic and blocking potential threats from reaching the devices connected to the network. Routers in a SOHO environment often come with Wi-Fi capability, allowing multiple devices to connect to the internet wirelessly. Additionally, these routers typically include features such as Network Address Translation (NAT), which allows multiple devices on a local network to share a single public IP address, and Dynamic Host Configuration Protocol (DHCP), which assigns IP addresses to devices on the network.