Networking Protocols, Ports, Standards, and Organizations What Does it All Mean?

By Stephen Bucaro

To network computers and devices, they must have some medium of communications. Examples of network communication media are: electric signals, light signals, and radio waves. But they need another important thing, a set of rules that all devices agree to. For example; what voltage will the signal be? what shape will the signal be? what frequency will the signal be? what encoding will be used? This set of rules is called a protocol.

Examples of protocols are: HTTP (Hypertxt Protocol), SMTP (Simple Mail Transfer Protocol), FTP (File Transfer Protocol), DHCP (Dynamic Host Configuration Protocol). There are many more protocols (Wikipedia lists 30 different network protocols), and several different versions of many of them.

Not only do these protocols need to communicate between network computers and devices, but there often needs to be communication between different protocols. Protocols often communicate with each other in what called a protocol stack. Wikipedia lists over different ways protocols arrange into stacks.

Another thing a protocol needs is an agreed upon port to connect to. A port can be a specific electronic connection, or it can be a specific software interface to a process or a network service. Ports are identified by numbers, and each different protocol has a specific port that it uses. For example HTTP uses port number 80. SMTP uses port number 25. FTP uses port number 20. DHCP uses port number 68. These are referred to as Well-known ports. However, a network administrator may configure a different port for any protocol.

Yet another thing a protocol needs is a standard. A standard is a detailed specification which defines not only the characteristics of the protocol's signal, but also the design of the hardware interfaces. There are many different manufacturers of networking devices, and there is no law that forces any manufacturer to comply with a standard. But network administrators expect equipment from different manufacturers to operate together. So if a manufacturer does not comply with a standard, good luck selling your products.

Networking standards are developed by networking standards organizations. The mother of all standards, the OSI model (Open Systems Interconnection model) is maintained by the ISO (International Organization for Standardization). The HTTP standard is maintained by the IETF (Internet Engineering Task Force) and the (W3C) World Wide Web Consortium. Many protocol standards are maintained by the IEEE (Institute of Electrical and Electronic Engineers).

Different standards organizations follow different procedures for developing a standard. Most protocol standards start at the IETF. It starts with a document called a RFC (Request For Comments). If the standard is determined to desirable, the development of the new standard is carried out by a working group. Membership in a working group is voluntary and any interested party can participate.

The working group will create a draft of the standard and place it online. The document may remain as an online draft for up to six months while interested parties can review and comment on it. Based upon those comments, the working group may publish a revised version of the draft.

Once the draft standard has been commented on, tested, reviewed, and often implemented by several companies, it is considered sufficiently stable that it is released as an Internet Standard. As you can see, it's a long and complex path for an RFC to become a Standard. Many RFCs never reach Internet Standard status.

More Networking Protocols and Standards:
• The OSI Presentation Layer
• Wireless Standards - 802.11a 802.11b 802.11g 802.11n 802.11i Explained
• An Introduction to the Types of VPNs
• Classless IP Addressing
• Link Aggregation
• Comparing IPv4 and IPv6 at a Glance
• Network Routing Protocols - IGRP, EIGRP, OSPF, ISIS, BGP
• Remote Control Protocols
• Video - Network Layer (Layer 3) of OSI Networking Model
• IPv4 Datagram Fields

RSS Feed

 Follow @Stephen Bucaro

 Basics and Certification
 Technologies and Media
 Protocols and Standards
 Troubleshooting and Support
 Network Security
 Cisco Certification