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3.4 Store-and-Forward
Store-and-Forward is one type of packet-forwarding techniques. A
Store-and Forward Fast Ethernet Switch stores the incoming frame in
an internal buffer, do the complete error checking before transmission.
Therefore, no error packets occurrence, it is the best choice when a
network needs efciency and stability.
The Fast Ethernet Switch scans the destination address from the
packet-header, searches the routing table provided for the incoming
port and forwards the packet, only if required. The fast forwarding
makes the Switch attractive for connecting servers directly to the
network, thereby increasing throughput and availability. However, the
Switch is most commonly used to segment existing hubs, which nearly
always improves overall performance. An Ethernet Switching can be
easily congured in any Ethernet network environment to signicantly
boost bandwidth using conventional cabling and adapters.
Due to the learning function of the Fast Ethernet Switch, the source
address and corresponding port number of each incoming and outgoing
packet are stored in a routing table. This information is subsequently
used to lter packets whose destination address is on the same
segment as the source address. This connes network trafc to its
respective domain, reducing the overall load on the network.
The Fast Ethernet Switch performs “Store and Forward" therefore, no
error packets occur. More reliably, it reduces the re-transmission rate.
No packet loss will occur.
3.5 Auto-Negotiation
The STP ports on the Fast Ethernet Switch have built-in “Auto-negoti-
ation”. This technology automatically sets the best possible bandwidth
when a connection is established with another network device (usually
at Power On or Reset). This is done by detect the modes and speeds at
the second of both device is connected and capable of, both 10Base-T
and 100Base-TX devices can connect with the port in either Half- or
Full-Duplex mode.