NETWORK STRUCTURE

Network Structure

Network Structure

Introduction

One of the first and most important is the Arpanet open networks (USA). Its name comes from the Advanced Research Projects Agency, part of the DOD or Department of Defense. In the late 60's the network connecting science departments of various universities and some private companies. It now covers half globe, from Hawaii to Norway. Much of this knowledge networks is a direct consequence of Arpanet project.

Arpanet difference in a network the following:

Host: Machines running user processes (applications). This definition includes the mechanisms of access to sub-network.

Sub-Network: mechanisms that allow the passage of information from one host to another.

Transmission lines are also called circuits or channels. Is the physical medium through which the transmission is made of the data?

IMP (Interface Message Processor): also called nodes, packet switches, computers, communications, data links, intermediate systems, and so on. They are specialized computers that only run communications programs. Its mission is to enable a connection between two or more transmission lines. When data arrives on an input line, the switching element must select a start line to redirect.

Scenario as the Network Manager:

 

Two (2) Routers Cisco 1751V.

Two (2) Modem RAD ASM-45

Two (2) Switch

Two (2) PCs with soft phone users and the program installed Wire shark

Two (2) PC with Asterisk server installed.

Two (2) IP Phones IPPH2 Tiger Netcom.

Two (2) Headsets

Requisite

In my network design need 250 computers. Each room network printer connects to the Internet. According to my design need 250 VOIP. Every system near connects to the VOIP phone. It needs 25 Network printers for every room to fix. Ground floor need 4 switches and first floor need 6 switches. My network designs needs 4 firewalls. All data store storage device, so need storage device also backup server device. Every room will fit the fire alarm, so they need (Bacharach, 1980).

Three Layered Hierarchical Model

Hierarchical network is making to help to create networks more worth and predictable. Step by step makes to help to understand the networking. In my network design used tree and bus topology. Inner room side tree topology used and outside backbone of the bus topology used. Cisco layer pattern contains three layers are given bellow (Baker, 1992).

Method of Core Layer

Method of Distribution Layer

Method of Access Layer

OSI model in the seven layers to be some works but not protocols. Single protocol is can be mapped to more than single layer, and more than single layer can communicate with a single layer. We can build physical apply of using hierarchical network in Cisco model. Networking main problem is how data traffic flows in the core layer, distribution layer and access layer in LAN campus. If system A1 in LAN "A" it send a data to System C1 in LAN C, the data are first send to switch in LAN A (Bavelas, 1950).

Three-Layered Hierarchical Mode

Core layer

This layer is considered the backbone of the network and includes the high-end switches and high-speed cables such as fibber cables. This layer of the network does not route traffic on the LAN. In addition, no packet manipulation is done by devices in this ...