C7: Common Channel Signaling 7
Common Channel Signaling 7 (CCS7 or C7), also known as Signaling System #7 (SS7), is a telecommunications protocol suite defined by the ITU-T which is used by the telephone companies for interoffice signalling SS7 uses out of band or common-channel signalling (CCS) techniques. SS7/C7 uses a separated packet-switched network for the signalling purpose. SS7 is known as C7 outside North America.
Standard Organization: ITU-T

CCMP: Counter mode with Cipher-block chaining Message authentication code Protocol
Counter mode with Cipher-block chaining Message authentication code Protocol(CCMP) is an encryption protocol in the 802.11i standard. The CCMP is based upon the CCM mode of the AES encryption algorithm and utilizes 128-bit keys, with a 48-bit initialization vector (IV) for replay detection.
Standard Organization: IEEE
Reference Document: 802.11i

CCP: Compression Control Protocol
Compression Control Protocol (CCP), a protocol in the Point-to-Point Protocol suite, configures, enables, and disables data compression algorithms on both ends of the point-to-point link.
Standard Organization: IETF

CCS7: Common Channel Signaling 7
Common Channel Signaling 7 (CCS7 or C7), also known as Signaling System #7 (SS7), is a telecommunications protocol suite defined by the ITU-T which is used by the telephone companies for interoffice signalling SS7 uses out of band or common-channel signalling (CCS) techniques. SS7/C7 uses a separated packet-switched network for the signalling purpose. SS7 is known as C7 outside North America.
Standard Organization: ITU-T

CDDI: Copper Distributed Data Interface
Copper Distributed Data Interface (CDDI), a version of FDDI using twisted pair cables, provides data rates of 100 Mbps and uses dual-ring architecture to provide redundancy. CDDI supports distances of about 100 meters from desktop to concentrator. The CDDI standard is officially named as the Twisted-Pair Physical Medium-Dependent (TP-PMD) standard. It is also referred to as the Twisted-Pair Distributed Data Interface (TP-DDI).
Standard Organization: ANSI

CDMA: Code Division Multiple Access
Code Division Multiple Access (CDMA) is a second generation (2G) cellular technology defined by Qualcomm in IS-95 and IS-2000. Other widely used multiple access techniques for cellular are Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA). CDMA technologies are evolving into CDMA2000 to meet the challenges. CDMA2000 is the 3rd Generation solution based on IS-95.
Standard Organization: Qualcomm
Reference Document: wireless

CDMA2000: Code Division Multiple Access 2000
Code Division Multiple Access 2000 (CDMA2000) is the 3rd Generation solution based on CDMA IS-95, which supports 3G services as defined by the ITU 3G standards IMT-2000. CDMA2000 defines both an air interface and a core network. CDMA2000 has already been implemented as an evolutionary step from cdmaOne as CDMA2000 provides full backward compatibility with IS-95B.
Standard Organization: Qualcomm
Reference Document: wireless

cdmaOne
cdmaOne is the commercial name for a CDMA (Code Division Multiple Access) system defined by the consortium including Qualcomm, AT&T Wireless and Motorola. The IS-95 standard is part of cdmaOne as the air interface.
Standard Organization: Qualcomm
Reference Document: wireless

CDP: Cisco Discovery Protocol
Cisco Discovery Protocol (CDP) is primarily used to obtain protocol addresses of neighboring devices and discover the platform of those devices. CDP can also be used to show information about the interfaces your router uses. CDP is media- and protocol-independent and runs on all Cisco-manufactured equipment, including routers, bridges, access servers and switches.
Standard Organization: Cisco

CEP: Certificate Enrollment Protocol
Certificate Enrollment Protocol (CEP) is a certificate management protocol jointly developed by Cisco Systems and VeriSign, Inc. CEP is an early implementation of Certificate Request Syntax (CRS), which is a standard of IETF under the PKIX group. CEP specifies how a device communicates with a CA, including how to retrieve the public key of the CA, how to enroll a device with the CA, and how to retrieve a certificate revocation list (CRL). CEP uses Public Key Cryptography Standard (PKCS) 7 and PKCS 10 as key component technologies.
Standard Organization: Cisco

CGMP: Cisco Group Management Protocol
Cisco Group Management Protocol (CGMP) limits the forwarding of IP multicast packets to only those ports associated with IP multicast clients. These clients automatically join and leave groups that receive IP multicast traffic, and the switch dynamically changes its forwarding behavior according to these requests.
Standard Organization: Cisco

CHAP: Challenge Handshake Authentication Protocol
Challenge Handshake Authentication Protocol (CHAP) is used to periodically verify the identity of the peer using a 3-way handshake. This is done upon initial link establishment and may be repeated any time after the link has been established. CHAP uses a challenge/response authentication mechanism where the response varies every challenge to prevent replay attacks.
Standard Organization: IETF
Reference Document: RFC 1994

CIF: Cells in Frames
Cells in Frames is an ATM Protocol for ATM over LAN but with Variable Length Packets. CIF allows ATM to be embedded into various frame based legacy protocols (Ethernet & Token Ring), using only one ATM header for up to 31 cells from the same virtual circuit in a packet. The specification of CIF over PPP and Sonet is underway. A significant feature of CIF is that ATM can be transported to workstations without changing the legacy NIC card because the necessary processing is done in simple downloaded software "SHIM" on the workstation.
Standard Organization: ETSI & ECSA

CIFS: Common Internet File System
The Common Internet File System (CIFS), an enhanced version of Microsoft Server Message Block (SMB), is the standard way that computer users share files across intranets and the Internet. CIFS enables collaboration on the Internet by defining a remote file-access protocol that is compatible with the way applications already share data on local disks and network file servers. CIFS runs over TCP/IP and utilizes the Internet's global Domain Naming Service (DNS) for scalability, and is optimized to support slower speed dial-up connections common on the Internet. CIFS can be sent over a network to remote devices using the redirector packages. The redirector also uses CIFS to make requests to the protocol stack of the local computer.
Standard Organization: Microsoft

CLAW: Common Link Access for Workstations
Common Link Access for Workstations (CLAW) is a Data link layer protocol to transport data between the IBM mainframe and the Channel Interface Processor (CIP) in TCP/IP environments. CLAW improves efficiency of channel use and allows the CIP to provide the functionality of a 3172 in TCP/IP environments and support direct channel attachment. The output from TCP/IP mainframe processing is a series of IP datagrams that the router can switch without modifications.
Standard Organization: IBM

CLDAP: Connectionless Lightweighted Directory Access Protocol
Connectionless Lightweighted Directory Access Protocol (CLDAP) is defined in RFC 3352. CLDAP is not deployed in real network.
Standard Organization: IETF

CLNP: Connectionless Network Protocol
Connectionless Network Protocol (CLNP) is an ISO network layer datagram protocol by the layers defined in the Reference Model for Open Systems Interconnection (ISO 7498). CLNP provides fundamentally the same underlying service to a transport layer as IP in the TCP/IP environment. Therefore, CLNP is also called ISO-IP. Another OSI protocol in the network layer is CONP (Connection-Oriented Network Protocol), which provides connection-oriented services at the network layer.
Standard Organization: ISO
Reference Document: X.213

CLTP: Connectionless Transport Protocol
Connectionless Transport Protocol (CLTP) provides for end-to-end Transport data addressing (via Transport selector) and error control (via checksum), but cannot guarantee delivery or provide flow control. It is the OSI protocol stack equivalent of UDP of TCP/IP protocol stack.
Standard Organization: ISO

CMAC: Cipher-based Message Authentication Code
Cipher-based Message Authentication Code (CMAC) is an authentication algorithm defined by the National Institute of Standards and Technology (NIST). Also called NIST-CMAC, it is a keyed hash function that is based on a symmetric key block cipher, such as the Advanced Encryption Standard [NIST-AES]. CMAC is equivalent to the One-Key CBC MAC1 (OMAC1) submitted by Iwata and Kurosawa [OMAC1a, OMAC1b]. OMAC1 is an improvement of the eXtended Cipher Block Chaining mode (XCBC) submitted by Black and Rogaway [XCBCa, XCBCb], which itself is an improvement of the basic Cipher Block Chaining-Message Authentication Code (CBC-MAC). XCBC efficiently addresses the security deficiencies of CBC-MAC, and OMAC1 efficiently reduces the key size of XCBC. There are a few variations of CMAC available, such as AES-CMAC and AES-CMAC-PRF-128 defined by IETF.
Standard Organization: NIST
Reference Document: Special Publication 800-38B

CMIP: Common Management Information Protocol
Common Management Information Protocol (CMIP), an ISO protocol used with the Common Management Information Services (CMIS), supports information exchange between network management applications and management agents. CMIS defines a system of network management information services. CMIP supplies an interface that provides functions which may be used to support both ISO and user-defined management protocols.
Standard Organization: ISO
Reference Document: X.711

CMIS: Common Management Information Service
Common Management Information Service (CMIS), an ISO protocol used with the Common Management Information Protocol (CMIP), supports information exchange between network management applications and management agents. CMIS defines a system of network management information services. CMIP supplies an interface that provides functions which may be used to support both ISO and user-defined management protocols.
Standard Organization: ISO
Reference Document: X.711

CMOT: CMIP Over TCP/IP
CMIP Over TCP/IP (CMOT) is a network management protocol using ISO CMIP to manage IP-based networks. CMOT defines a network management architecture that uses the International Organization for Standardization's (ISO) Common Management Information Services/Common Management Information Protocol (CMIS/CMIP) in the Internet.
Standard Organization: IETF
Reference Document: RFC 1189

CONP: OSI Connection-Oriented Network Protocol
OSI Connection-Oriented Network Protocol (CONP) is an OSI network layer protocol that carries upper-layer data and error indications over connection-oriented links. Two types of OSI network layer services are available: Connectionless Network Service (CLNS) and Connection-Mode Network Service (CMNS). CONP, based on the X.25 Packet-Layer Protocol (PLP), provides the interface between CMNS and upper layers.
Standard Organization: ISO

COPS: Common Open Policy Service
The Common Open Policy Service (COPS) protocol is a simple query and response protocol that can be used to exchange policy information between a policy server (Policy Decision Point or PDP) and its clients (Policy Enforcement Points or PEPs). One example of a policy client is an RSVP router that must exercise policy-based admission control over RSVP usage. At least one policy server exists in each controlled administrative domain. The COPS protocol has a simple but extensible design.
Standard Organization: IETF
Reference Document: RFC 2748

CR-LDP: Constraint-based LDP
Constraint-based LDP (CR-LDP) is one of the protocols in the MPLS architecture. It contains extensions for LDP to extend its capabilities, such as setup paths, beyond what is available for the routing protocol. For instance, an LSP (Label Switched Path) can be set up based on explicit route constraints, QoS constraints and other constraints.
Standard Organization: IETF
Reference Document: RFC 3212

CRS: Certificate Request Syntax
Certificate Request Syntax (CRS) describes syntax for certification requests. A certification request consists of a distinguished name, a public key, and optionally a set of attributes, collectively signed by the entity requesting certification. Certification requests are sent to a certification authority, which transforms the request into an X.509 public-key certificate.
Standard Organization: IETF
Reference Document: RFC 2986

CSMA/CA: Carrier Sense Multi-Access/Collision Avoidance
Carrier Sense Multi-Access Collision Avoidance (CSMA/CA) is one of the methods in CSMA. CSMA is a network access method used on shared network topologies such as Ethernet for a node to verify the absence of other traffic before transmitting on a shared physical medium. In Collision Avoidance (CA), collisions are avoided because each node signals its intent to transmit before actually doing so. This method is not popular because it requires excessive overhead that reduces performance. CA is used in wireless LAN communications.
Standard Organization: IEEE
Reference Document: IEEE 802.3

CSMA/CD: Carrier Sense Multi-Access/Collision Detection
Carrier Sense Multi-Access (CSMA) is a network access method used on shared network topologies such as Ethernet for a node to verify the absence of other traffic before transmitting on a shared physical medium. Collision Detection (CSMA/CD) is one of the methods often used in Ethernet to avoid possible collision, in which when a collision occurs, and both devices stop transmission, wait for a random amount of time, then retransmit.
Standard Organization: IEEE
Reference Document: IEEE 802.3

CSMA: Carrier Sense Multi-Access
Carrier Sense Multi-Access (CSMA) is a network access method used on shared network topologies such as Ethernet for a node to verify the absence of other traffic before transmitting on a shared physical medium. CSMA devices attached to the network cable listen (carrier sense) before transmitting. If the channel is in use, devices wait before transmitting. Multiple Access(MA) indicates that many devices can connect to and share the same network. All devices have equal access to use the network when it is clear. Even though devices attempt to sense whether the network is in use, there is a good chance that two stations will attempt to access it at the same time. There are two methods for avoiding these so-called collisions: Carrier Sense Multi-Access/Collision Avoidance and Carrier Sense Multi-Access/Collision Detection.
Standard Organization: IEEE
Reference Document: IEEE 802.3

CSLIP: Compressed Serial Link Internet Protocol
Compressed Serial Link Internet Protocol (CSLIP), also known as Van Jacobsen TCP header compression, is an extension of SLIP that, when appropriate, allows just header information to be sent across a SLIP connection, reducing overhead and increasing packet throughput on SLIP lines. CSLIP can reduce the TCP header from 40 bytes to seven bytes but with no effects on UDP.
Standard Organization: IETF
Reference Document: RFC 1114

CTERM: Command Terminal
Command Terminal (CTERM) is a protocol in the Digital Network Architecture for the terminal emulation. CTERM uses DECnet to provide a command terminal connection between DEC terminals and DEC operating systems such as VMS and RSTS/E.
Standard Organization: IETF
Reference Document: RFC 1114