Which two types of network connections use PPP?ISDN and DSLWi-Fi and cellularDial-up and ISDNCable and DSL

To answer which two types of network connections use PPP (Point-to-Point Protocol):

1. Dial-up and ISDN: Both of these technologies utilize PPP to establish a point-to-point connection. Dial-up connections use a modem to connect over telephone lines, while ISDN (Integrated Services Digital Network) allows for digital transmission over traditional phone lines and also employs PPP for its data link layer.

Other options, such as Wi-Fi and cellular, use different protocols (like WEP/WPA for Wi-Fi, and various cellular protocols) that are not specifically PPP.

In summary, the correct answer is Dial-up and ISDN.