A modular network switch with 3 network modules (a total of 24 Ethernet and 14 Fast Ethernet ports) and one power supply.
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Switches

A network switch (or just switch) is a networking device that performs transparent bridging (connection of multiple network segments with forwarding based on MAC addresses) at up to the speed of the hardware. more...

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Common hardware includes switches, which can connect at 10,100, or 1000 megabits per second, at half or full duplex. Half duplex means that the device can only send or receive any given time, whereas full duplex can send and receive, at the same time. The use of specially designed expansion also makes it possible to have large numbers of connections utilizing different mediums of networking, including Ethernet, Fibre Channel, ATM, 802.11, to name frequently used technologies.

A switch can connect Ethernet, token ring, Fibre Channel or other types of packet switched network segments together to form a Internetwork.

If a network has only switches and no hubs then the collision domains are either reduced to a single link or, if both ends support full duplex, eliminated altogether. The principle of a fast hardware forwarding device with many ports can be extended to higher layers giving the multilayer switch.

A repeater is the simplest multi-port device in use. However, its technology has been considered outdated since a hub is a "dumb device", as it resends every datagram it receives to every port except the original incoming. With multiple computers, the speed quickly slows down, and collisions start occurring, making the connection even slower. However, with the advent of the network switch, this problem has been solved.

Forwarding methods

There are four forwarding methods a switch can use:

Store and forward - The switch buffers and, typically, performs a checksum on each frame before forwarding it on.; Cut through - The switch only reads up to the frame's hardware address before starting to forward it. There is no error checking with this method.; Fragment free - A method which attempts to retain the benefits of both "Store and Forward" and "Cut-through". Fragment Free checks the first 64 bytes of the frame, where addressing information is stored. This way the frame will always reach its intended destination. Error checking of the actual data in the packet is left for the end device in Layer 3 or Layer 4 (OSI), typically a router.; Adaptive switching - A method automatically switching between the other three modes.;

Note that "cut through" switches have to fall back to "store and forward" if the outgoing port is busy at the time the packet arrives.

Note that these forwarding methods are not controlled by the user and are configured only by the switch itself.

Types of switches

Form factor

Rack mounted; Non rack mounted;

Read more at Wikipedia.org


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Cisco Ws-C6509-E Catalyst Switch 6500 6509 E Series $123,375.00 Cisco Ws-C4510R Switch 4500 4510R Series W/ 2x Ws-X4418 $51,175.00
Cisco7606 Switch Cisco 7600 7606 Series Ws-Sup720-3B $131,285.00 Cisco Ws-C2950-12 Switch 2950 12 Port Tnet 50xAvail $125.00
Cisco 7609 Router Cisco7609 Sup-720-3Bxl Ws-X6748-Ge-Tx $133,085.00 Cisco Catalyst Ws-C2950-24 24 Port 10/100 2950 Switch $135.00
Cisco Ws-C3524-Pwr-Xl-En 3524 Pwr Tnet 20x Available $210.00 Cisco Ws-C3524-Xl-En 3524 Xl En Tnet 30x Available $125.00
Cisco Catalyst Ws-C2950-24 24 Port Fe Switch 2950 $127.00 Cisco Ws-C3750G-24T-S Catalyst Switch 1-Year Warranty $1,995.00
Cisco Ws-C3550-24Pwr-Smi w/ Emi 3550 24 Pwr Smi Tnet $579.00 AdTran NetVanta 1224R 1200510L1 Switch w/ T1 / Dbu Port $89.00
Cisco Ws-C3550-48-Smi w/ Emi 3550 48 Smi Tnet 15xAvail $595.00 Cisco Ws-C3750-24Ts-S 24-Port 3750 24Ts 1-Year Warranty $1,999.00
New Smc 16 Port 10/100/1000 Gigabit Ethernet Switches $99.00 Cisco Ws-C3548-Xl-En 3548 Xl En Tnet 40x available $119.00
Extreme Networks Black Diamond 10808 10Gethernet Switch $54,995.00 Cisco Ws-C2950-24 24-Port 10/100 Switch Ccna/Ccnp/2950 $135.00
Cisco Ws-C2950-24 Catalyst 2950 24-Port 10/100 Switch $140.00 Cisco 2950 24 Port 10/100 Switch Catalyst Ws-C2950-24 $49.99
Ws-C2970G-24T-E 2970G 24-Port Gb Switch W/ Ei Software! $1,025.00 Cisco Catalyst Ws-C3524-Xl-En 24 Port Switch $59.95
Cisco 2950 Ws-C2950-24 Catalyst Switch W/ Ears Console $119.99 Dlink Dss-5+ 5-port 10/100 ethernet Switch -New - Free $12.50
5 Cisco 2950 Catalyst Switch Ws-C2950-24 Ios Ver 12.1 $549.00 Dell Powerconnect 5224 Gb 24 Port Switch 10/100/1000 $189.99
Cisco Catalyst Ws-C2950G-24-Ei 24 Port Switch 2950 Gbic $277.00 Avaya Cajun P133G2-E 24-Port 10/100 2Port Fx Switch New $64.95
24-Port Rack-Mount Switch w/2 Gigabit Ports #Tl-Sl1226 $95.00 New Cisco Catalyst 3560 Gigabit Ethernet Switch $5,746.99
New Cisco Catalyst 2950-24 Ethernet Switch $588.99 J4905A Hp ProCurve Switch 3400cl W/20 Rj-45 10/100/1000 $1,995.00
New Netgear Jgs524F 24-Port Gigabit Ethernet Switch $307.99 New Smc Ez Switch 5-port 10/100 Fast Ethernet Deskto... $25.99
Dynex 4-Port 10/100 Ethernet Hub Free Shipping $11.99 Tp-Link 5-Port Fast Ethernet Desktop Switch #Tl-Sf1005D $16.99
Tp-Link 16-Port Gigabit Rack Mount Switch #Tl-Sg1016 $117.99 Avaya Cajun P120 24-Port 10/100 Workgroup Switch - New $47.95
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Prices current as of last update, 07/03/08 1:31pm.


See also...
3Com, Switches
Adtran, Switches
Alcatel, Switches
Cisco, Switches
D-Link Professional Switches, Switches
Dell, Switches
Extreme Networks, Switches
Foundry, Switches
HP, Compaq, Switches
Intel, Switches
Linksys Professional Switches, Switches
Lucent, Avaya Cajun, Switches
Marconi, Fore Systems, Switches
Netgear, Switches
Nortel, Bay Networks, Switches
Other Switches, Switches

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