What are two common types of circuit-switched WAN technologies? (Choose two.)
- ISDN
- DSL
- PSTN
- ATM
- Frame Relay
Explanation: The two most common types of circuit-switched WAN technologies are the public switched telephone network (PSTN) and the integrated services digital network (ISDN). Frame Relay and ATM are packet-switched WAN technologies. DSL is a WAN technology that offers broadband Internet access.
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