This PDF describes about Network Switch, its different layers, advantages and disadvantages.For more information visit http://www.shopricom.com/J8706A/HP-ProCurve-Switch-zl-24-Port-Mini-GBIC-Module

1. Network Switch : Its Different Layers,Advantages
and Disadvantages

2. Network Switch
A network switch can be defined as the device that
connects the network devices or network segments. It
is the telecommunication device that receives
messages and then sends them only to the targeted
receivers, unlike hub which transmits to all the
network devices. The switches can perform in
different layers. One of the examples of switch can be
HP GBICs

3. Different Layers Of Switch
• Layer 1 : In this layer the switch performs the
function which is called as Port mirroring. This helps
to send network packets from one switch port to
another switch ports.

4. Different Layers Of Switch
• Layer 2 :In this layer, the network switch performs
bridging .Bridging can be done in different ways like
Storing and then forwarding. In this process the
switch verifies the frames before it sends them.
Bridging can be also done by Cutting through, where
no error checking process takes place. Another way
can be fragment free bridging, where the errors of the
actual data is being checked by the end devices.

5. Different Layers Of Switch
• Layer 3 :In this layer, the functions are mainly done
by a Router .In this layer the Switch can increase their
efficiency by delivering more traffic.

6. Different Layers Of Switch
• Layer 4 : This layer is basically vendor dependent. It
may contain firewall, VPN concentrator and IP
Security Gateway.

7. Different Layers Of Switch
• Layer 7 :This layer distributes loads through the
URL (Uniform Resource Locator) and includes web
cache and can take part in a content delivery network .

8. Advantages Of Network Switch
• The number of broadcast domains gets decreased.
• Unlike hub, switches are more hardware oriented.
• It can make use of CAM table for port to Mac
Mapping.
• Unlike Routers, multi ports of switches are available
in lower cost.
• It helps in logical segmentation by supporting VLan.

9. Disadvantages Of Network Switch
• Sometimes, if switches are in Promiscuous mode they
are vulnerable to security attacks like spoofing IP
address or capturing of Ethernet Frames.
• Proper designing and configuration is required if
multicast packets are being handled.
• While limiting broadcasts, switches are not as good as
routers.

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