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RIR
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Regional Internet Registry. An organization that manages IP addresses and AS numbers on behalf of :term:`IANA`.
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root nameserver
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A name server that is responsible for the root of the domain names hierarchy. There are currently a dozen root nameservers and each DNS resolver See http://www.root-servers.org/ for more information about the operation of these root servers.
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round-trip-time
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The round-trip-time (RTT) is the delay between the transmission of a segment and the reception of the corresponding acknowledgment in a transport protocol.
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router
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A relay operating in the network layer.
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RPC
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Several types of remote procedure calls have been defined. The RPC mechanism defined in :rfc:`5531` is used by applications such as NFS
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SDU (Service Data Unit)
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a Service Data Unit is the unit information transferred between applications
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segment
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a segment is the unit of information transfer in the transport layer
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SMTP
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The Simple Mail Transfer Protocol is defined in :rfc:`821`
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SNMP
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The Simple Network Management Protocol is a management protocol defined for TCP/IP networks.
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socket
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A low-level API originally defined on Berkeley Unix to allow programmers to develop clients and servers.
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