lesson 1

Backbone: the large transmission lines that travel long distance.

l  Checksum: a number that allows packet to be checked for errors when it is received.

l  Computer network: often just called a network,

l  Domain Name System: a system that assigns names to IP addresses.

l  Header: information that is attached to an IP packet that gives information about the packet itself.

l  Internet: is a collection of computer networks that communicate with each other using a common set of rules.

l  Internet Corporation for Assigned Names and Numbers (ICANN):

l  Internet Protocol (IP): the rules that define how data is routed over the internet.

l  Internet Society (ISOC): the group that organizes the groups that are responsible for internet standards.

l  IP address: an internet address.

l  IP packet: a packet of data that can travel over the internet.

l  Local area network (LAN): a network that typically spans only one building or a group of buildings in the same area.

l  Name server: a computer that translate a named address into an IP address.

l  Network:

l  Packet: the small pieces of data that travel over a packet-switched network such as the internet.

l  Packet-switched network: a network in which data is transmitted in small pieces called packets.

l  Protocol: a set of rules that determine how communicate occurs.

l  Router: a device that examines packets and decides the packets should take.

l  Transmission Control Protocol (TCP): the rules that define how data is broken down into packets.

l  World Wide Web Consortium (W3C): a group of people involved in the development of specifications and recommendations about