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Network switches

techsfair.com
A switch is a network hardware component that joins multiple computers on the same LAN together. Comparing to a hub switches only forward data information only to the intended destination. This is because they are built, with slightly smarter technology than the hub. In the case of availability switches are also more common. They can also be connected to other switches by doing this creating an increase in the number of devices on a LAN without idling one or more system in the network. Switches are used interconnecting printers, computers,  game consoles and DVD drives, switches also allows the smooth flow of data transfer to the designated device like I said. Streaming videos from a different device and downloading pictures while you are in the other room, are just some examples of the function of a switch. In term of troubleshooting switches are much easier also because all the ports on a switch have a physical status light indicator.


Types of Network Switches
LAN Switch or Active Hub
Also known as the local area network or Ethernet switch, this device is used to connect points on a company’s internal LAN. It blocks the overlap of data packets that run through a network by allocating the bandwidth economically. When we say bandwidth, it refers to the amount of data that can be carried from one point to the other under a given period of time. With a LAN switch, it reduces the network traffic by delivering the data only to its intended recipient. The important bandwidth would first be delivered before the subsequent ones. And this is called preference in networking.

Unmanaged Network Switches
Mostly used in home networks and small companies or businesses, this device allows other devices on the network to connect with each other; it could be from one computer to the other, or a computer connected to a printing device. As what the name suggests, this type of device does not need to be watched constantly and it is the easiest and simplest installation, because of its small cable connections.

Managed Switches
Unlike the unmanaged network switch, this device is customizable; this means you can do varieties of configuration like VLAN and others because of this features, in this way, we can then enhance the functionality of a certain network. This device has two types – Smart switches and Enterprise switches.
Smart switches have limited features, but provide a web interface and accept configurations of basic settings. They are perfect for fast and constant LANs which support gigabit data transfer and allocations.
Enterprise switches have a wide range of management features and the capability to fix, copy, and transform and display network configurations. They are usually found in large companies which contain large numbers of connections, nodes, switches, and ports. Having more features than the smart switches, Enterprise switches are usually more expensive.

A typical switch should have the following capabilities:
Full Gigabit access
Provides 8 10/100/1000M adaptive RJ45 port, all the ports have the line speed forwarding capacity; provide 2 independent Gigabit SFP (Mini GBIC) expansion slot optical fiber module, fully protect user investment, convenient and flexible Comprehensive safety protection system.
Simple operation, simplifying the management of network; combination of ARP attack protection function, completely solve the network ARP spoofing attacks; support port security, can limit the number of port MAC address, MAC address effective defense attack; support DoS attack protection, effectively guarantee the network security.

Powerful VLAN capabilities
IEEE, 802.1Q, VLAN, meets the needs of different users; make the network more convenient, efficient and safe.

Rich QoS strategy
3 priority modes based on port, IEEE802.1p and DSCP to guarantee the priority processing of key business data; support traffic control function, and can reasonably allocate bandwidth.

Multilevel access control policy
Powerful hardware ACL capacity, support L2~L4 data stream classification; easy network monitoring, traffic regulation, priority weight markers and data forwarding control; support time based ACL control, easy to realize the time accurate access control needs; support port and MAC 802.1x based authentication based on user access, easy setup.

Reliability design
STP/RSTP/MSTP two layer link protection technology, greatly improve the ability of fault tolerance, redundancy link, to ensure stable operation of the network; provide static convergence and dynamic aggregation of two kinds of convergence pattern, effectively increase the link bandwidth, improve link reliability, while achieving load balancing, link backup; support multicast management, through the IGMP Snooping technology, effective inhibition of multicast overload caused by network congestion.

Secure network management and maintenance
CLI command line (Console, Telnet), Web network, SNMP (V1/V2c/V3, SSH (V1/V2) and other management methods, to achieve fast and convenient network management; support user identity classification, filtering and other functions, enhanced security configuration; support port data monitoring, real-time monitoring of network status, to easily achieve the global unified management of the network, convenient flexible.

Advanced watchdog Technology
System integration against false halt system, when the system resources exhausted or the system suspended tasks and other unexpected circumstances, the system will automatically restart, to ensure reliable operation of the network.

 Excellent PoE power supply performance
PoE features should comply with IEEE, 802.3af and IEEE 802.3at standards, automatically detect and identify equipment in accordance with IEEE, 802.3af and IEEE 802.3at standards, and supply power to them;
Intelligent power supply management, flexible power supply scheduling, conditions restart, conditional shutdown, adapt to complex office environment applications;

POE police function, real-time automatic device on-line detection function, when the lower equipment crashes, automatically restart the port power supply, to ensure rapid restoration of the network, without manual operation.

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