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NAT
NAT (Network Address Translation - also known as IP masquerading) enables an
organization to present itself to the Internet with one address. NAT converts the
address of each LAN node into one IP address for the Internet (and vice versa). NAT
also provides a certain amount of security by acting as a firewall by keeping
individual IP addresses hidden from the WAN.
(Network) Administrator
The network administrator is the person who manages the LAN within an
organization. The administrator's job includes ensuring network security, keeping
software, hardware, and firmware up-to-date, and keeping track of network activity.
NTP
NTP (Network Time Protocol) is used to synchronize the realtime clock in a computer.
Internet primary and secondary servers synchronize to Coordinated Universal Time
(UTC).
Packet
A packet is a portion of data that is transmitted in network communications. Packets
are also sometimes called frames and datagrams. Packets contain not only data, but
also the destination IP address.
Ping
Ping (Packet INternet Groper) is a utility used to find out if a particular IP address is
present online, and is usually used by networks for debugging.
Port
Ports are the communications pathways in and out of computers and network devices
(routers and switches). Most PCs have serial and parallel ports, which are external
sockets for connecting devices such as printers, modems, and mice. All network
adapters use ports to connect to the LAN. Ports are typically numbered.
PPPoE
PPPoE (Point-to-Point Protocol Over Ethernet) is used for running PPP protocol
(normally used for dial-up Internet connections) over an Ethernet.
PPTP
Point-to-Point Tunneling Protocol uses TCP to deal data for tunnel maintenance, and
uses PPP for sum up the information carried within the tunnel. The data carried within
the tunnel can be compressed or encrypted. The encryption method used is RSA RC4.
PPTP can operate when the protocol is supported only on the client and the server
located on the other end that the client is corresponds with. No support is essential
from any of the routers or servers within the network the two PCs are connecting
across.
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