A glue that holds the whole Internet together is the network layer protocol, (1) .Unlike most old...

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IP (Internet Protocol) IP (Interworking Protocol) TCP (Transport Control Protocol) TCP (Transfer Communication Protocol)

best-quality quality-guaranteed connection-oriented best-efforts

best-quality quality-guaranteed connection-oriented best-efforts

holds out holds on to holds back holds on

best-quality Quality-guaranteed connection-oriented Best-efforts

IP (Internet Protocol) IP (Interworking Protocol) TCP (Transport Control Protocol) TCP (Transfer Communication Protocol)

data link transport network application

40-byte fixed 64-byte fixed 20~64 bytes variable 20-byte fixed

data link transport network application

stick glue gather assemble

data link transport network application

data link transport network application

data link Transport network Application

40-byte fixed 64-byte fixed 20-64 bytes variable 20-byte fixed

IP (Internet Protocol) IP (Interworking Protocol) TCP (Transport Control Protocol) TCP (Transfer Communication Protocol)

data link transport network Application

holds up holds down holds out holds in

holds it up holds it on holds it back holds it in

holds on holds up holds out holds back