29-08-2014, 02:52 PM
Virtual LAN ON SEMINAR REPORT
Virtual LAN.pptx (Size: 827.85 KB / Downloads: 13)
CATEGORIES OF NETWORK
LAN(local area network)
Normally covers area less than 2 miles
Speed are normally 100 to 1000Mbps
WAN(wide area network)
WAN can be world wide
MAN(metropolitan area network)
Network which size between LAN & WAN
Normally span tens of miles
Local Area Networks (LAN)
Generally defined as a broadcast domain.
“Hubs, bridges, or switches on the same physical segment or segments connect end node devices”
A router is not needed for end nodes on the same LAN segment to communicate with each other.
However a router is necessary for these devices to communicate with devices on other LAN segments
Why use VLAN's?
To the left, a LAN environment connected by routers
Drawback:
Routers add latency that delays the transmission of data
Solution?
Switched Network
To the right, a LAN environment connected by switches.
Speed and latency advantages.
Drawback:
All end nodes (or hosts) are in same broadcast domain, which adds to the network a significant amount of traffic that is seen by all hosts.
Solution?
VLANs
So what is a VLAN?
VLAN
VLAN stands for Virtual Local Area Network.
A virtual local area network (VLAN) is a group of hosts with a common set of requirements that communicate as if they were attached to the same broadcast domain regardless of their physical location.
Configured through software rather than hardware. So it is extremely flexible.
VLANS create broadcast domains
Broadcast Domain?
A broadcast domain is a network segment in which any network device can transmit data directly to another device without going through a router
[b]LAN Vs VLAN
VLANs allow a network manager to logically segment a LAN into different broadcast domains . Since this is a logical segmentation and not a physical one, workstations do not have to be physically located together.
Users on different floors of the same building, or even in different buildings can now belong to the same LAN.
Traditional LAN
A traditional LAN would require all users of the same requirements and same IP subnet (broadcast domain) be connected to the same equipment
Benefits of VLANs
Geographically separated users on the same IP subnet (broadcast domain).
Limit the size of broadcast domains and limit broadcast activity.
Security benefits by keep hosts separated by VLAN and limiting what devices can talk to those hosts.
Cost savings as you don’t need additional hardware and cabling.
Operational benefits because changing a user’s IP subnet (Broadcast Domain) is in software
Conclusion
VLANs are cost and time-efficient.
VLAN can reduce network traffic, and provide an extra measure of security.
A VLAN is configured by software, not by hardware(physically wiring).