Cyle+Bulan

newton_bulan,cyle abraham-assignment 1 =What is a Network?=

-The word network can be used to describe a very large and complicated set of equipment. In its most accurate and simplest definition a network refers to the cables and electronic components that amplify the signals going through the cables. The amplifying equipment is necessary to ensure accurate communication and make the signal stronger if it needs to go long distances.

=Network Topology= -is the layout pattern of interconnections of the various elements ([|links], [|nodes], etc.) of a [|computer network]. Network topologies may be physical or logical. Physical [|topology] means the physical design of a network including the devices, location and cable installation. [|Logical topology] refers to how data is actually transferred in a network as opposed to its physical design. Topology can be considered as a virtual shape or structure of a network. This shape does not correspond to the actual physical design of the devices on the computer network. The computers on a home network can be arranged in a circle but it does not necessarily mean that it represents a ring topology. Any particular network topology is determined only by the graphical mapping of the configuration of physical and/or logical connections between nodes. The study of network topology uses [|graph theory]. Distances between nodes, physical interconnections, transmission rates, and/or signal types may differ in two networks and yet their topologies may be identical. A[|local area network](LAN) is one example of a network that exhibits both a physical topology and a logical topology. Any given node in the LAN has one or more links to one or more nodes in the network and the mapping of these links and nodes in a graph results in a geometric shape that may be used to describe the physical topology of the network. Likewise, the mapping of the data flow between the nodes in the network determines the logical topology of the network. The physical and logical topologies may or may not be identical in any particular network.

=DIFFERENT NETWORK TOPOLOGIES=

1.BUS topology – uses a single backbone segment (length of cable) that all the hosts connect to directly. The idea is that is just like riding a bus. It has only one driver and many passengers who are riding.

2. RING topology – connects one host to the next and the last host to the first. This creates a physical ring of cable.

3. STAR topology – connects all cables to a central point of concentration. This point is usually a hub or switch. It has a focal point where all the resources are there.

4. EXTENDED STAR topology – uses the star topology to be created. It links individual stars together by linking the hubs/ switches. This will extend the length of the network

5. HIERARCHICAL topology - is created similar to an extended star but instead of linking the hubs/ switches together, the system is linked to a computer that controls the traffic on the topology

6. MESH topology – is used when there can be absolutely no break in communications. So as you can see in the graphic, each host has its connections to all other hosts. This also reflects the design of the internet which has multiple paths to any one location.