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A subnet mask is used to determine the number of networks and the number of host computers. Every class of the IP address uses the different range of the subnet mask. Subnet masks allow the IP based networks to be divided into the sub networks for performance and security purposes.
An IP address is a unique identifier of a computer or network device on the local area network, WAN or on internet. Every host computer on the internet must have a unique IP address. IP addresses on the internet are usually assigned by the local ISPs to which users are connected.
WiFi or wireless fidelity is a base-band network technology that is used for the wireless data communication.
Lightweight Directory Access Protocol is used to access the directory services from the Active directory in Windows operation systems.
SMTP - 25, POP3 - 110, IMAP4 - 143, RPC - 135, LDAP, FTP-21, HTTP-80
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