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Game Development Dictionary


Network


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  Term Name Description

Modem

A shorter term for "modulator/demodulator". This is a device which takes data from a computer and turns it into a series of audio pulses which can be sent over a telephone line; on the receiving end, these pulses are "demodulated" into a copy of the original data. Modern internet devices like ADSL and cable no longer use this exact type of technology, but the term "modem" has been expanded to include these devices.

Cable Modem

An internet service which transmits data through a thick cable to the consumer; naturally, this means that a lot of data can be transmitted quickly. Though the technology itself has no self-imposed limits -- other than the maximum speed possible for transmission -- cable companies often place maximum speeds on the internet connections, since people generally don't need much upload speed. This is in the best interest of the consumer, because it allows everyone to have fair access to the total amount of speed available to the company.

SDSL

Symmetric Digital Subscriber Line. This is a high-speed internet connection which, like a cable modem, runs at very high speeds. Unlike conventional ADSL (Assymetric Digital Subscriber Line), however, an SDSL connection is "symmetric" -- it receives data just as fast as it sends data, and in both cases, this is very fast. However, SDSL requires its own special line -- whereas ADSL runs through a normal phone line -- and is very expensive.

OpenSSL

A collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

MOSPF

Multicast Open Shortest Path First. A Multicast Version of OSPF

OSPF

Open Shortest Path First. The OSPF is a (link state) routing protocol used by the Internet community. OSPF is classified as an Interior Gateway Protocol (IGP), this means that it distributes routing information between routers belonging to a single Autonomous System. OSPF is used over IP. That means that an OSPF packet is transmitted with an IP data packet header. The PROTOCOL field in the IP header is set to 89 for OSPF. OSPF is designated to be run internal to a single Autonomous System. Each OSPF router maintains an identical database describing the Autonomous System's topology. From this database, a routing table is calculated by constructing a shortest path tree. OSPF recalculates routes quickly in the face of topological changes, utilizing a minimum of routing protocol traffic. Separate routes can be calculated for each IP type of service. OSPF allows sets of networks to be grouped together. Such a grouping is called an area and it's topology is hidden from the rest of the Autonomous System. This information hiding enables a significant reduction in routing traffic. An area is a generalization of an IP subnetted network. All OSPF routing protocol exchanges are authenticated. This means that only trusted routers can participate in the AS's routing. Information Source

Telnet

Telnet is a protocol that allows you to connect to remote computers (called hosts) over a TCP/IP network (such as the Internet). You use software called a telnet client on your computer to make a connection; there is a telnet server on the remote host, which the telnet client negotiates with to establish a connection. Once connected, the client becomes a virtual terminal, and allows you to communicate with the host computer from your computer. In most cases, you'll be asked to log into the remote system. This usually requires an account on that system. Occasionally you can log in as guest or public without having an account. Telnet clients are available for all major operating systems.

Repeater

Device used in networks to regenerate analog and digital signals. Analog signals are simply amplified, while digital signals are nearly reproduced.

Crosstalk

Electromagnetic interference, usually a near by cable or electronic device, affecting a signal being transmited over a medium network cable. In cases where closely bound cables/devices is unavoidable, shielded cabling is used.

attenuation

The reduction in signal strength during transmission over a network. Too much attenuation can render a signal incomprehensible. To solve this networks implement repeaters, and follow the maximum length standards for the medium (cabling) in use.

WAN

Wide Area Network. A network that spans a great distance, usually over a public network, such as telephone. WANs are typically 2 or more connected LANs. The Internet is the largest.

MAC address

Media Access Control address. The address on a piece of hardware, on the MAC layer of the network, that is used to identify a node on a network. This address is unchangable since it resides in the hardware itself.

Node

Any connection in a network with a unique MAC address. This can be, for example, a computer or a printer.

VNC

VNC stands for Virtual Network Computing. It is, in essence, a remote display system which allows you to view a computing 'desktop' environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. VNC's Website

FTP site

A computer or website which makes files available for download using File Transfer Protocol.

FTP

An abbreviation for "File Transfer Protocol". This is a technology which allows the transfer of files from one computer to another. FTP also allows for limited access to the files on a computer by reequesting a user name and password. Anyone who does not have a password can enter the user name "anonymous" and his e-mail address as a password. But users with special priviliges may have access to files to which the general public does not have access.

IP

Internet Protocol

Switch

A switch acts like a hub in that it connects multiple network connections, but is "smarter" in that it knows where to send them, it cuts down on broadcasting.

Hub

A piece of hardware that connects multiple network connections together, such as computers. Can be active or passive. Sends a brodcast signle to all computers untill a response is received from the destination client.

Router

A router is a piece of hardware that directs network traffic from one network to the other, and can also act as a firewall.

Crossover-Cable

A cable specifically used in network situations involving only two computers. By using a crossover-cable there is no need of a network hub, saving you money. Often used in home situations and direct comunication between two network servers. There are two variants: -One using your COM/PARALEL ports. (not recomended: slow) -And one using your Network Interface Card. Check your local suplier for details, a good suplier always has a couple of crossover's on stock.

PPP

Point-to-Point-Protocol, used in internet connections.

NIC

Network Interface Card. Hardware used to interact through a network. Usually on a LAN.

IRC

Internet Relay Chat. A client-server created to allow people to talk to each over a network. The unit runs a IRC client, such as mIRC, and connects to an IRC server and can then talk to other through channels or directly.

Online

Usually refered to as being on the Internet or using the Internet.


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