Rakesh Dhar
Rahul Tripathi
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Virtual Local Area Network
Logical group of network users
Associate with ports on a switch
Unique ID and NAME
VLANs could span multiple switches
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Mail Server
Attendance Software
ERP
Tally
CCTV System
Telecom
Data Backup
Database Services
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Easy to hide
Network Stuck
Lack of redundancy
Broadcast issue
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Broadcast domain become too large
No security control for individual switch ports
Inflexible because subnets are created only
with addition of routers
Net B
Net A
Router
Net D
Net C
A flat network
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Plan a efficient network.
Solve Network Speed issue.
Create Separate Vlan with different
department & Services.
Securing your network.
Network Monitoring.
Superior capability.
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Create smaller broadcast domains by
grouping users according to
◦ Location
◦ Department
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Improve security by preventing anyone in
the same LAN from monitoring the
network traffic (eavesdropping)
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Receive
Receive
Switch
Receive
Router
Receive
Switch
Receive
Switch
Receive
Receive
Receive
BROADCAST
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VLAN A
Switch
Router
Switch
Switch
VLAN B
VLAN C
RECEIVE
RECEIVE
BROADCAST
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Switches do not route data between VLANs
Routing has to be done in routers, the same
way as with ordinary subnets
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Network monitoring
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NMS software monitors network hardware to
ensure all devices are operating correctly and are not near or at full capacity.
Alerts can be sent to network administrators if a problem is detected.
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Device detection - When a new device is
connected to the network, the NMS
detects it so that it can be recognized,
configured, and added to the network.
This is also called device provisioning.
Performance analysis - An NMS can
gauge the current and historical
performance of a network. This includes
the overall performance of the network
as well as individual devices and
connections. For example, the NMS may
detect aspects of a network
where throughput is nearing the
maximum bandwidth available. The data
can be used to optimize the flow of
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Fault management - If a device or section of
a network fails, an NMS may be able to
automatically reroute traffic to limit
downtime. This action may be performed on
the fly or may be accomplished using a set of
preconfigured rules. When a fault occurs, a
network alert or notification is usually sent to
one or more network administrators.
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Thank You
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