Manual XBC-U

Chapter 1 Introduction
System
(17) IP Address
Address of respective computers on the Internet made of figures binary of 32 bits (4 bytes) to distinguish the
applicable machine on the Internet. Classified into 2 sections, network distinguishing address and host
distinguishing address. The network address and the host address is respectively divided into class A, B and C
based on the bits allotted. IP address since it shall be unique all over the world, shall be decided not optionally but
as assigned by NIC(Network Information Center) of the applicable district when joining the Internet. In Korea,
KRNIC(Korea Network Information Center) is in charge of this work. Ex.) 165.244.149.190
(18) ISO (International Organization for Standardization)
A subsidiary organization of UN establishing and managing the international standards
(19) LAN (Local Area Network)
Called also as local area communication network or district information communication network, which allows lots
of computers to exchange data with each other as connected though communication cable within a limited area
such as in an office or a building
(20) MAC (Medium Access Control)
A method used to decide which device should use the network during given time on the broadcast network
(21) Node
Each computer connected with the network is called Node
(22) Packet
A package of data which is the basic unit used to send through the network. Usually the package is made of
several tens or hundreds of bytes with the header attached in front to which its destination and other necessary
information are added
(23) PORT number
Used to classify the applications on TCP/UDP.
Ex.) 21/tcp : Telet
(24) PPP (Point-to-Point Protocol)
Phone communication protocol which allows packet transmission in connecting with the Internet. In other words,
normal phone cable and modem can be used for the computer to connect through TCP/IP with this most general
Internet protocol.
Similar to SLIP, however with modern communication protocol factors such as error detection and data
compression, it demonstrates more excellent performance than SLIP.
(25) Protocol
Contains regulations related with mutual information transmission method between computers connected with
each other through the network. The protocol may specify detailed interface between machines in Low level (for
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