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Terminologies Simplified

Mesh Network Topology A physical network topology in which at least two paths lead to and from each network node. This type of topology provides backup connections in the event of connection failure between nodes.

Message Digest 5 Algorithm (MD5) A proposed encryption method for the Simple Network Management Protocol (SNMP) that uses a message, an authentication key, and time information to formulate a checksum value known as a digest.

Message-oriented Text Interchange System (MOTIS) A Message-Handling System (MHS) developed by the International Standards Organization (ISO). The basic MOTIS elements are compatible with the Consultative Committee for International Telegraphy and Telephony (CCITT) X.400 MHS specifications.

Message Switching A switching technique that involves sending network messages from node to node, with each message stored at a node until a forwarding path becomes available.

Message-Transfer Agent (MTA) A component specified in the Consultative Committee for International Telegraphy and Telephony (CCITT) X.400 Message Handling Service (MHS) that stores (or forwards) electronic mail (e-mail) messages to a User Agent (UA), another MTA, or to some other authorized recipient.

Message-Transfer Layer (MTL) A component specified in the Consultative Committee for International Telegraphy and Telephony (CCITT) X.400 Message Handling Service (MHS) that represents one of two sublayers of the Application Layer (Layer 7) in the OSI Reference Model and provides access to transfer services across a network. The other sublayer (which resides above the MTL) is the User Agent Layer (UAL).

Message-Transfer Service (MTS) A component specified in the Consultative Committee for International Telegraphy and Telephony (CCITT) X.400 Message Handling Service (MHS) that processes requests from Access Units (AUs), Message Stores (MSs), Message-Transfer Agents (MTAs), and User Agents (Uas).

Metropolitan Area Network (MAN) A network that spans a larger geographical area than a local area network (LAN) but a smaller geographic area than a wide area network (WAN).

Microwave Network A wireless network that uses microwave transmissions to transmit signals between nodes on the network.

Microwave Transmission A transmission that occurs in a high bandwidth above 1-gigahertz (GHz) in the electromagnetic spectrum and used in a wireless network. A microwave transmission requires a line of sight between the sender and receiver, but can use Earth-based or satellite receivers.

Mobile-Telephone Switching Office (MTSO) A central computer that monitors all cellular communication transmissions and adjusts channel assignments to accommodate the fluctuating quality of signals.

Modem Short for modulator/demodulator that describes a device used to convert digital data into analog (or waveform) signals for transmission along analog signal carriers. The device also converts received analog signals; it does not translate back and forth between analog and digital formats.

Multicast A transmission method in which multiple (but not all) nodes on the network receive a copy of a frame or packet.

Multicast Backbone (MBONE) A multicast, virtual network that adds live audio and video capabilities to the Internet. An MBONE network is organized as clusters of networks connected by tunnels (paths between endpoints that support both multicast transmissions) and multicast Internet Protocol (IP) transmissions.
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