Client-server architecture server: ÷always-on host permanent IP address server farms for scaling clients: communicate with server may be intermittently connected may have dynamic IP addresses do not communicate directly with each other 2:Application Layer 82: Application Layer 8 Client-server architecture server: v always-on host v permanent IP address v server farms for scaling clients: v communicate with server v may be intermittently connected v may have dynamic IP addresses v do not communicate directly with each other