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Chapter 11 Appendix
DHCP server (Dynamic Host Configuration Protocol)
It is necessary to set an IP address for each computer or equivalent equipment when a network is
established by TCP/IP. If there exists DHCP server on the network, it will assign IP addresses to client
computers every time they request it. If there exists equipment with DHCP server functions (such
as a Windows 2000 server and a dial-up router) on the network, the DHCP server function may be
automatically operating. Ask your system administrator whether the DHCP server is operating.
ESSID (Extended Service Set Identifier)
ESSID is the ID that is set to computers on Wireless LAN or access point in order to prevent each
computer from being crossed. The computers or access point to which the same ESSID is set can
communicate with each other. If an ESSID is different, it is impossible to communicate. ESSID
distinguishes between lowercase and uppercase characters, and allows you to use English one byte
characters and half-size symbols up to 32 characters.
WEP (Wired Equivalent Privacy)
WEP is a security protocol for Wireless LAN. It protects computers on Wireless LAN and access point
from unauthorized access by setting a description code onto them. It is necessary to set the same
decryption code for equipment.
Wi-Fi (Wireless Fidelity)
It is a brand name, showing that the interconnectivity between wireless LANs is certified by the Wi-Fi
Alliance (formerly WECA). The products that passed the Wi-Fi Alliance interoperability test are given
the certification of ‘Wi-Fi certified’ and permitted to use the Wi-Fi Logo. The products that have Wi-Fi
logo are guaranteed to interoperate with other Wi-Fi products.
Wireless Channel
It is necessary to divide frequency spectrums into some Wireless channels for Wireless
communication, and to tune to the same channel between Wireless equipment. If you use the same
channel on the same floor, and there are some Wireless LANs that have a different ESSID for each, the
communication speed may become slow. In that case, using different channels for each Wireless LAN
is effective, which lowers a possibility of mutual interference between Wireless LANs.
MAC address (Media Access Control Address)
MAC address is a physical address for every network interface. The MAC address consists of 6-byte
hex number. The first 3 bytes are a Vendor ID controlled and assigned by IEEE. The last 3 bytes are
controlled and assigned by the manufacturers of network interface (no duplication of MAC address).
Therefore, MAC address is a unique physical address in the world. Ethernet sends and receives frames
on the basis of MAC address.
Terminology