OCR A Level Computer Science- Networks Review Questions and Answers

Protocol A set of rules governing the exchange or transmission of data between devices. Hypertext Transfer Protocol (HTTP) protocol that defines how messages are formatted and transmitted over the World Wide Web File Transfer Protocol (FTP) a simple network protocol that allows the transfer of files between two computers on the internet Transmission Control Protocol (TCP) provides reliable, ordered, and error-checked delivery of a stream of packets on the internet. Internet Protocol (IP) A communication standard that enables computers to route communications traffic from one network to another as needed. Post Office Protocol (POP) An application layer over the internet standard protocol used by local email clients to retrieve email from a remote server over TCP/IP connection. Internet Message Access Protocol (IMAP) A protocol that resides on an incoming mail server. Similar to POP, but is more powerful. Allows sharing of mailboxes and multiple mail server access. Simple Message Transfer Protocol (SMTP) the basic communications protocol used to send e-mail UDP (User Datagram Protocol) Protocol that operates instead of TCP in applications where delivery speed is important and quality can be sacrificed. Application Layer provides services to ensure that effective communication between computer programs on a network is possible. Transport Layer A set of protocols that ensure that data are transferred from point A to point B reliably and without errors. This layer services include flow control, acknowledgment, error correction, segmentation, reassembly, and sequencing.