In computer networking, the term upper layer protocol refers to a more abstract protocol when performing encapsulation, in particular it is often used to describe the protocols above the network layer.
In discussions of the Internet Protocol Suite, the term upper layer protocols usually refers to the protocols above the Internet Layer (e.g. Transmission Control Protocol, which is in the Transport Layer). In the internet protocol suite, IP is the lower layer protocol to UDP and TCP; likewise UDP and TCP are two upper layer protocols for IP.
The term contrasts with lower layer protocol which refers to a more specific protocol.
Famous quotes containing the words upper and/or layer:
“When my old wife lived, upon
This day she was both pantler, butler, cook,
Both dame and servant, welcomed all, served all,
Would sing her song and dance her turn, now here
At upper end o’the table, now i’the middle,
On his shoulder, and his, her face afire
With labor, and the thing she took to quench it
She would to each one sip.”
—William Shakespeare (1564–1616)
“After a few months’ acquaintance with European “coffee,” one’s mind weakens, and his faith with it, and he begins to wonder if the rich beverage of home, with its clotted layer of yellow cream on top of it, is not a mere dream after all, and a thing which never existed.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)