📄 tytxbfi.htm
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<P><B>Remote Network Monitor (RMON)—</B>A device (such as a workstation) that collects and maintains information about network traffic.
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<P><B>Remote Procedure Call (RPC)—</B>A TCP/IP protocol that provides a routine which calls a server that returns output and status (return) codes to the client.
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<P><B>Repeater—</B>A network device that boosts the power of incoming signals to enable the length of a network to be extended.
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<P><B>Requests for Comment (RFCs)—</B>Documents containing specifications for TCP/IP protocols. RFCs are also used to propose new protocols. RFCs are available from the Network Information Center (NIC).
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<P><B>Resolver—</B>Software that enables clients to access the Domain Name System (DNS) database and acquire an address.
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<P><B>Resource—</B>Usually refers to application programs, but also used generally to refer to system capabilities such as memory, networks, and so on.
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<P><B>Retransmission Timeout—</B>Occurs when data has been sent to a destination but no acknowledgment has been received when a timer has expired. When a retransmission timeout occurs, the protocol usually resends the data.
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<P><B>Reverse Address Resolution Protocol (RARP)—</B>A TCP/IP protocol that enables a device to acquire its IP address by performing a broadcast on the network.
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<P><B>RIP (Routing Information Protocol)—</B>A TCP/IP protocol used to exchange information about routing. Usually used when only a small number of computers are in use.
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<P><B>rlogin—</B>Remote login service that enables a user on one machine to log in as a user on another. It is similar to Telnet.
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<P><B>Round Trip Time—</B>The time for a TCP segment to be sent and its acknowledgment received.
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<P><B>Router—</B>A device that connects LANs into an internetwork and routes traffic between them.
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<P><B>Routing—</B>The process of determining a path to use to send data to its destination.
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<P><B>Routing Information Protocol (RIP)—</B>A protocol used to exchange information between routers.
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<P><B>Routing Table—</B>A list of valid paths through which data can be transmitted.
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<P><B>RS232C—</B>A physical layer specification for connecting devices. Commonly used for serial lines.
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<P><B>SAP (Service Access Point)—</B>The location at which two applications can exchange information.
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<P><B>Segment—</B>A protocol data unit (PDU) that consists of a TCP header and (optional) data. Also used to refer to parts of a network that is divided into smaller parts (segments).
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<P><B>Send Window—</B>A range of sequence numbers that can be received.
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<P><B>Sequence Number—</B>A 32-bit field in the IP header that identifies the datagram.
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<P><B>Serial—</B>A sequence of events occurring one after another.
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<P><B>Serial Line Internet Protocol (SLIP)—</B>A protocol used to utilize TCP/IP over serial lines.
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<P><B>Server—</B>An application that answers requests from other devices (clients). Also used as a generic term for any device that provides services to the rest of the network, such as printing, high-capacity storage, and network access.
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<P><B>Simple Mail Transfer Protocol (SMTP)—</B>In TCP/IP, an application providing electronic mail services.
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<P><B>Socket—</B>In TCP/IP, an addressable point that consists of an IP address and a TCP or UDP port number that provides applications with access to TCP/IP protocols.
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<P><B>Socket Address—</B>The complete designation of a TCP/IP node consisting of a 32-bit IP address and a 16-bit port number.
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<P><B>Socket Descriptor—</B>An integer used by an application to identify the connection.
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<P><B>Source—</B>The originating device.
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<P><B>Source Routing—</B>A routing method determined by the source device.
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<P><B>Subnet—</B>In TCP/IP, part of a TCP/IP network identified by a portion of the Internet address.
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<P><B>Subnet Address—</B>The part of the IP address that identifies the subnetwork.
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<P><B>Subnet Mask—</B>A set of bits that excludes networks from having a system-wide broadcast, instead restricting the broadcast to a subnetwork.
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<P><B>Switched Connection—</B>A data link connection that is established on demand (like a telephone call).
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<P><B>SYN—</B>A segment used in the start of a TCP connection to enable both devices to exchange information defining characteristics about the session. It is also used to synchronize the target and destination devices.
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<P><B>Synchronous Data Transfer—</B>The transfer of data between two nodes at a timed rate (as opposed to asynchronously).
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<P><B>Telnet—</B>A TCP/IP application that enables a user to log in to a remote device.
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<P><B>TCP/IP—</B>Transmission Control Protocol/Internet Protocol.
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<P><B>10Base2—</B>An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling, with a contiguous cable segment length of 100 meters and a maximum of 2 segments.
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<P><B>10Base5—</B>An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling, with 5 continuous segments not exceeding 100 meters per segment.
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<P><B>lOBaseT—</B>An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling and twisted pair cabling.
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<P><B>Terminal Server—</B>A network device that provides physical access for dumb terminals, usually using an abbreviated TCP/IP protocol to enable a dumb terminal to remotely log on.
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<P><B>Terminator—</B>A resistor that must be on both ends of thick and thin Ethernet networks.
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<P><B>Throughput—</B>The amount of data that can be transferred through a medium within a certain time period.
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<P><B>Time-to-Live (TTL)—</B>The amount of time a datagram can remain on the internetwork. It is usually specified as the number of hops to permit.
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<P><B>Token Ring—</B>A lower layer connection-based networking protocol using a token passing method to control data traffic.
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<P><B>Topology—</B>The configuration of network devices.
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<P><B>Traffic—</B>A general term used to describe the amount of data on a network backbone.
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<P><B>Transceiver—</B>A network device required in baseband networks that takes a digital signal and puts it on the analog baseband medium. Transceivers can sense collisions.
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<P><B>Transmission Class 4—</B>An OSI transport layer protocol similar to TCP. Often referred to as OSI TP4.
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<P><B>Transmission Control Block (TCB)—</B>A data structure that holds information about TCP and UDP connections.
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<P><B>Transmission Control Protocol (TCP)—</B>A transport layer protocol that is part of the TCP/IP protocol suite and provides a connection-based, reliable data stream.
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<P><B>Trivial File Transfer Protocol (TFTP)—</B>A mechanism for remote logons similar to Telnet but that uses UDP as a transport layer protocol instead of TCP.
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<P><B>UDP (User Datagram Protocol)—</B>A connectionless transport layer protocol. It does not perform retransmission of data.
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<P><B>User Agent—</B>An electronic mail program that helps end users manage messages.
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<P><B>User Service—</B>A service provided by TCP permitting an application to specify that data being transmitted is urgent and should be processed as soon as possible.
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<P><B>Well Known Port—</B>In TCP/IP, an address for an agreed upon purpose.
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<P><B>Wide Area Network (WAN)—</B>Usually used to refer to a network spanning large geographic distances.
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<P><B>X.400—</B>A protocol defining standards for electronic mail in an open network.
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<P><B>X.500—</B>A protocol defining standards for directory services in an open network.
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<P><B>X Series—</B>A collection of widely accepted standards, including data communications.
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<P><B>X Windows—</B>A software protocol developed at MIT for a distributed windowing system. X uses TCP for a transport protocol.
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<P><B>XNS (Xerox Networking Standard)—</B>Networking protocols developed by Xerox, similar to TCP/IP.
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