communications protocol

(redirected from Network protocols)
Also found in: Dictionary, Thesaurus.

communications protocol

Hardware and software that governs data transmission between computers and mobile devices. The term "protocol" is very generic and is used for hundreds of different communications methods. A protocol may define the packet structure of the data transmitted or the control commands that manage the session, or both. A protocol "suite" such as TCP/IP is made up of several levels of functionality. Learning the 7-layer protocol hierarchy, known as the "OSI model," is essential for understanding protocols. See OSI model and interface.

TCP/IP and Ethernet
TCP/IP is the standard routing protocol of the Internet and most internal networks. It ensures that every message sent was received in full. Ethernet is an access method that is responsible for moving packets from one node to another. See TCP/IP, Ethernet, Token Ring, ATM, IPX, SPX, NetBIOS, NetBEUI and SS7.

Conceptually Speaking


The following are very conceptual exchanges managed by TCP/IP and Ethernet.

TCP/IP Protocol
Are you there? Yes, I am. Are you ready to receive? Yes, I am. Here comes the message--blah, blah, blah-- did you get it? Yes, I did. Here comes the next part--blah, blah, blah-- did you get it? No, I didn't - resend it. Here it comes again-- blah, blah, blah-- did you get it? Yes, I did. There is no more. Goodbye. Goodbye.

Ethernet Access Method (Shared Hub Example)
Is the network busy? Yes, it is. Wait random amount of time. Is the network busy? Yes, it is. Wait random amount. Is the network busy? No, it isn't. Here goes the frame... did it collide with another packet on the line? No, it didn't. Is the network busy? Yes, it is. Wait random amount. Is the network busy? No, it isn't. Here goes the next frame... did it collide? Yes, it did. Wait random amount. Is the network busy? No, it isn't. Here goes the frame again... did it collide?

Examples


The following communications protocols are or have been widely used (name in parentheses is the protocol suite). There are a large number of protocols at all layers. For a comprehensive list with detailed descriptions, visit www.protocols.com.

Layer Protocol

     1       RS-232
     1       V.35
     1       SONET

     1-2     802.11 wireless (Wi-Fi)
     1-2     Bluetooth wireless

     2       Ethernet
     2       Fast Ethernet
     2       Gigabit Ethernet
     2       Token Ring
     2       FDDI
     2       ATM

     3       IP      (TCP/IP)
     3       IPX     (NetWare)

     4       TCP     (TCP/IP)
     4       UDP     (TCP/IP)
     4       SPX     (NetWare)
     4       NetBEUI (NetBIOS)

     5       NetBIOS

     6       ASN.1

     7       SMB     (NetBEUI)
     7       AFP     (AppleTalk)
     7       NCP     (NetWare)
     7       NFS     (TCP/IP)
     7       HTTP    (TCP/IP)
     7       FTP     (TCP/IP)
     7       SMTP    (TCP/IP)
     7       DNS     (TCP/IP)
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Protocols CPN is a CPN model proposed in this paper for non-public network protocols with its aim to take advantage of formal modeling to analyze the functions and features of non-public network protocols.
It has more than 400 filters for isolating network traffic and analyzers for decoding more than 60 network protocols. It can display AppleTalk, Banyan VINES, DECnet, Novell, OSI, SNA, and XNS packets.
To investigate these ideas, we propose to model a large network as a cellular automaton (CA), where the behavior of each cell captures some important details related to network protocols. Specifically, our model maintains the individual identity of packets in order to reproduce the "ripple effect" (3) seen in real network connections.
The system updates data every few minutes and supports ATM, VLAN and Fast EtherChannel networks, as well as LAN, T1/E1, T3/E3, Fast Ethernet, FDDI, and Token Ring network protocols. WebCast 2.1 is shipping immediately priced at US$2,495.
Resolving to get aggressive with its technology, Syntax is steeling itself to announce a campaign to win cross-industry support for its TotalNet common file system that can accommodate SMB/CIFS, NCP, AFP and NFS network protocols. It thinks that if it can get its OEMs to evangelize the stuff then others should get curious.
(Standard network protocols can be used to transfer the scanned art file from PC to workstation.)
Small, simple, and multi-protocol, the EPS 1 Print Server solves compatibility problems before they occur, making it easier for users to change their networks, add new network protocols, or move their printers from one network to another.
The contributing researchers demonstrate the potential of a dendritic cell algorithm for addressing intrusion detection problems, describe an organic network control system for adapting network protocols to dynamically changing environments, and compare three neural networks for cognitive modeling.
Newly acquired patents in the portfolio include patents relating to network communication and cameras which deliver images over networks using different network protocols.
Thirty papers by an international group of researchers, developers, and users of reliable distributed systems address aspects such as replication, distributed services, security, distributed algorithms, network protocols, database and storage, wireless sensor networks, fault tolerance, and network issues.
Examples are based on the latest network protocols and models provided are specific to common real-world scenarios.

Full browser ?