Glossary Terms - C

CSMA/CD (Carrier Sense Multiple Access with Collision Detection): The access method used by local area networking technologies such as Ethernet. [Source: RFC 1208]
catenet (catenet): A network in which hosts are connected to networks with varying characteristics, and the networks are interconnected by gateways (routers). The Internet is an example of a catenet. See IONL. [Source: RFC 1208]
client-server model (client-server model): A common way to describe network services and the model user processes (programs) of those services. Examples include the name-server/name-resolver paradigm of the DNS and file- server/file-client relationships such as NFS and diskless hosts. [Source: RFC 1208]
CMOT (CMIP Over TCP): An effort to use the OSI network management protocol to manage TCP/IP networks. [Source: RFC 1208]
CCR (Commitment, Concurrency, and Recovery): An OSI application service element used to create atomic operations across distributed systems. Used primarily to implement two-phase commit for transactions and nonstop operations. [Source: RFC 1208]
CMIP (Common Management Information Protocol): The OSI network management protocol. [Source: RFC 1208]
CSNET (Computer+Science Network): A large computer network, mostly in the U.S. but with international connections. CSNET sites include universities, research labs, and some commercial companies. Now merged with BITNET to form CREN. See BITNET. [Source: RFC 1208]
connectionless (connectionless): The model of interconnection in which communication takes place without first establishing a connection. Sometimes (imprecisely) called datagram. Examples: LANs, Internet IP and OSI CLNP, UDP, ordinary postcards. [Source: RFC 1208]
CLNP (Connectionless Network Protocol): The OSI protocol for providing the OSI Connectionless Network Service (datagram service). CLNP is the OSI equivalent to Internet IP, and is sometimes called ISO IP. [Source: RFC 1208]
CLTP (Connectionless Transport Protocol): Provides for end-to-end Transport data addressing (via Transport selector) and error control (via checksum), but cannot guarantee delivery or provide flow control. The OSI equivalent of UDP. [Source: RFC 1208]
connection-oriented (connection-oriented): The model of interconnection in which communication proceeds through three well-defined phases: connection establishment, data transfer, connection release. Examples: X.25, Internet TCP and OSI TP4, ordinary telephone calls. [Source: RFC 1208]
COSINE (Cooperation for Open Systems Interconnection Networking in Europe): A program sponsored by the European Commission, aimed at using OSI to tie together European research networks. [Source: RFC 1208]
core gateway (core gateway): Historically, one of a set of gateways (routers) operated by the Internet Network Operations Center at BBN. The core gateway system forms a central part of Internet routing in that all groups must advertise paths to their networks from a core gateway, using the Exterior Gateway Protocol (EGP). See EGP, backbone. [Source: RFC 1208]
COS (Corporation for Open Systems): A vendor and user group for conformance testing, certification, and promotion of OSI products. [Source: RFC 1208]
CREN (CREN): See BITNET and CSNET. [Source: RFC 1208]

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