09-10-2012, 02:14 PM
Basic Networking Concepts
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Introduction
-A network can be defined as a group of computers and other devices
connected in some ways so as to be able to exchange data.
-Each of the devices on the network can be thought of as a node; each
node has a unique address.
-Addresses are numeric quantities that are easy for computers to work
with, but not for humans to remember.
Example: 204.160.241.98
-Some networks also provide names that humans can more easily
remember than numbers.
Example: www.javasoft.com, corresponding to the above numeric
address.
Addressing
Internet address
Consists of 4 bytes separated by periods
Example: 136.102.233.49
-The R first bytes (R= 1,2,3) correspond to the network address;
-The remaining H bytes (H = 3,2,1) are used for the host machine.
-InterNIC Register: organization in charge of the allocation of the
address ranges corresponding to networks.
-Criteria considered:
→ Geographical area (country)
→ Organization, enterprise
→ Department
→ Host
Domain Name System (DNS)
-Mnemonic textual addresses are provided to facilitate the manipulation
of internet addresses.
-DNS servers are responsible for translating mnemonic textual Internet
addresses into hard numeric Internet addresses.
Types of Networks
There are two principle kinds of networks: Wide Area Networks
(WANs) and Local Area Networks (LANs).
WANs
-Cover cities, countries, and continents.
-Based on packet switching technology
-Examples of WAN technology: Asynchronous Transfer Mode (ATM),
Integrated Services Digital Network (ISDN)
LANs
-Cover buildings or a set of closely related buildings.
-Examples of LAN technology: Ethernet, Token Ring, and Fibber
Distributed Data Interconnect (FDDI).
Ethernet LANs: based on a bus topology and broadcast communication
Token ring LANs: based on ring topology
FDDI LANs: use optical fibbers and an improved token ring mechanism
based on two rings flowing in opposite directions.