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You can expand on Empoweredbiz's diagram by saying<br />
<br />
SW1 ----&gt; SW2 ----&gt; SW3 ---&gt; SW4 ----&gt;SW1<br />
<br />
Spanning tree will analyze the links and determine that there is a loop among the 4 switches, one of the links betwen one of the switches will be blocked, based on some calculations that I dont understand, but it is based on traffic, bandwidth, etc. &nbsp;<br />
<br />
In this case, if the link between SW2 and SW3 was broken, the data coming from SW2 would back flow through SW1 then 4 to get to 3. 
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You can expand on Empoweredbiz's diagram by saying

SW1 ----> SW2 ----> SW3 ---> SW4 ---->SW1

Spanning tree will analyze the links and determine that there is a loop among the 4 switches, one of the links betwen one of the switches will be blocked, based on some calculations that I dont understand, but it is based on traffic, bandwidth, etc.  

In this case, if the link between SW2 and SW3 was broken, the data coming from SW2 would back flow through SW1 then 4 to get to 3.

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what is Spanning Tree Protocol. <br />
why it is used<br />
can any one explain me by using topology
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what is Spanning Tree Protocol. 
why it is used
can any one explain me by using topology

What is Spanning Tree Protocol

The term broadband commonly refers to high-speed Internet access that is always on and faster than the traditional dial-up access. Broadband includes several high-speed transmission technologies such as digital subscriber line (DSL), cable, fiber optics, wireless (for which there is a separate topic), satellite and broadband over powerlines (BPL).

Broadband

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.