|
A server that implements the DNS protocol and can resolve queries. A resolver usually serves a set of clients (e.g. all hosts in campus or all clients of a given ISP). It sends DNS queries to nameservers everywhere on behalf of its clients and stores the received answers in its cache. A resolver must know the IP addresses of the root nameservers.
|
|
RIP
|
|
Routing Information Protocol. An intradomain routing protocol based on distance vectors that is sometimes used in enterprise networks. RIP is defined in :rfc:`2453`.
|
|
RIR
|
|
Regional Internet Registry. An organization that manages IP addresses and AS numbers on behalf of :term:`IANA`.
|
|
root nameserver
|
|
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.
|
|
round-trip-time
|
|
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.
|
|
router
|
|
A relay operating in the network layer.
|
|
RPC
|
|
Several types of remote procedure calls have been defined. The RPC mechanism defined in :rfc:`5531` is used by applications such as NFS
|
|
SDU (Service Data Unit)
|
|
a Service Data Unit is the unit information transferred between applications
|
|
segment
|
|
a segment is the unit of information transfer in the transport layer
|
|
SMTP
|
|
The Simple Mail Transfer Protocol is defined in :rfc:`821`
|
|
SNMP
|
