Letterboxing is the process of adding black bars to the top and bottom of a movie or video after shrinking the whole image to fit a smaller screen, which otherwise could not accommodate the wide resolution of the film. This is done because most movies or films are shot in a widescreen format meant for the theaters, which is wider than the format...
Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX) is a set of network protocols that provide packet switching and sequencing for small and large networks. IPX works at layer three of the Open Systems Interconnection (OSI) model and SPX works at layer 4.
IPX/SPX was designed as a Transmission Control Protocol/Internet Protocol (TCP/IP) alternative. These protocols share similarities but have slight differences.
IPX/SPX is compatible with local area networks (LAN) or private networks and different communication protocol functions. For example, the Routing Information Protocol (RIP) function is used to route server information, which provides optimal data routing.
SPX is connection-oriented and used for routing information and connection-related functions. Like IP, IPX is connectionless and contains end-user data, such as IP addresses.
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