X.500

An international standard (1988) developed jointly by the International Organization for Standardization (ISO) and the ITU-T to support the e-mail name and address lookup requirements of X.400.

X.500 provides for global directory services that theoretically enable network managers to store information about all users, machines, and applications in a distributed fashion. X.500 is a very robust global directory standard that requires significant computational resources to implement and, therefore, is criticized for being over-engineered. See also e-mail, ISO, ITU-T, LDAP, X.400, and X Series.

• Cordless Telephony generation 1 (CT1)
• Cordless Telephony generation 1 plus (CT1+)
• Cordless Telephony generation 2 (CT2)
• Cordless Telephony generation 2 plus (CT2+)
• Cordless Telephony generation 3 (CT3)
• core
• core
• core switch
• core switch
• CoS (Class of Service)
• cost
• coulomb (C)
• counterintuitive
• country code
• country code Top Level Domain (ccTLD)
• coupler
• coupling efficiency
• coupling loss
• Coy, George W.
• CPE (Customer Premises Equipment)
• CPIM (Common Profile for Instant Messaging)
• cps (chips per second)
• CPU (Central Processing Unit)
• cracker
• CRC (Cyclic Redundancy Check)