Network virtualization

RGPV: Information storage & management: Unit 4

NETWORK VIRTUALIZATION

          

Network virtualization:

·         Network virtualization is a method of combining the available resource in a network by splitting up the available bandwidth into channels each of which is independent from the other and each of which can be designed to a particular server or device in real time.

 

·         Each channel is independently secured. Every subscriber has shared access to all the resources on the network from a single computer.

 

·         Network virtualization is intended to improve productivity, efficiency and job satisfaction of the administrator by performing many of these tasks automatically thereby disguising the true complexity of the network.

 

·         Files, images, programs and folder can be centrally managed from a single physical site. Storage media such as hard drives and tape drives can be easily added or reassigned. Storage space can be shared or reallocated among the server.

 

·         Virtual LAN is an example of network virtualization that provides easy flexible and less expensive way to manage networks.

 

Virtual LAN :

 

·        VLANs logically segment switched networks based on the functions, project teams, or applications of the organization regardless of the physical location or connections to the network.

 

·        All workstations and servers used by a particular workgroup share the same VLAN, regardless of the physical connection or location.

 

·        A workstation in a VLAN group is restricted to communicating with file servers in the same VLAN group.

 

·        VLANs function by logically segmenting the network into different broadcast domains so that packets are only switched between ports that are designated for the same VLAN.

 

·        Routers in VLAN topologies provide broadcast filtering, security, and traffic flow management.

 

·        VLANs address scalability, security, and network management.

 

·        Switches may not bridge any traffic between VLANs, as this would violate the integrity of the VLAN broadcast domain.

 

·        Traffic should only be routed between VLANs.

 

Additional VLAN components include:

 

·         High performance switches that logically segment connected end stations.

·         Transport protocol that carry VLAN traffic across LAN and ATM backbone.

·         Layer 3 routing solutions that existed VLAN communication between workgroup.

·         System compatibility and interoperability the previously installed LAN system.

·         Network management solution that offers centralized control , configuration and traffic management function.

 

Switch connecting three LAN

An organisation have 12 nodes which are grouped into three LANs that are connected by a switch, Group 1 consists of three nodes, group 2 have 4and 5 nodes in the groups. The LAN is configured to allow this type of arrangement.

If one of user from group 1 want to move to group 3 , then the LAN configuration needs to be changed . Rewiring would be required. In a switched LAN, changes in the workgroup mean physical changes in the network configuration.

 

Switch using VLAN software

                 

A LAN can be divided into several logical LAN called VLAN.

Each VLAN is a work group in the organization. The group membership in VLAN is defined by software, not hardware.   All members belonging to a VLAN can receive broad cast messages to the particular VLAN.

 

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