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Variable Length Subnet Mask (VLSM) is the new and efficient way to create Networks as compared to the old Fixed Length subnet mask.
In Fixed length subnet masks networks there are 2 categories - the basic is A,B & C subnets and the second is fixed subnets that are created from these basic subnets.
But in either of the methods there is lots of IP wastage, as different sections of the network will vary in the number of hosts connected to that network. Wastage is more in the first classic way of networks. It is minimized with the help of subnetting, but the problem still exists as some network segments may contain very less hosts but has to use the same subnet masks as the entire network and thus waste IPs.
While when we use VLSM different network segments may contain different subnets as per there requirement and while even doing so they will still be able to interact with each other using routers. The 2 main benefits of VLSM are -
1) Because of different subnet masks the broadcast from one subnet is not transmitted to other subnets. Thus saves lots of bandwidth.
2) It saves lots of IP,which is wasted instead.
Hope This helps
Happy Networking
-- By MyNarutoAnime
Wiki User
∙ 12y ago
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What are the advantages of variable length subnet masking VLSM?
There is a few great things about variable length subnet masking VLSM. The main great thing about it is that you can get a membership.
Does VLSM support RIPv1?
ya if they are on both side then.. if one side then not..
Did you can calculate VLSM in class A ip address?
There is no difference between using class a or an other
What does VLSM allow a network administrator to do?
utilize multiple subnet masks in the same IP address space
What field was added to the rip message header by RFC 1723 to add support for vlsm and cidr?
Subnet mask
Does ospf support vlsm?
yes
Explain the benefits gained by network designers through the use of VLSM?
VLSM (Variable Length Subnet Mask) Allows more than one subnet mask to exist within a network allows subnetting of an already subnetted network address. More Efficient use of IP addresses- Without the use of VLSM, companies must implement a single subnet mast within an entire Class A, B, or C network number. Greater capability to use route summarization - VLSM allows more hierarchical levels within an addressing plan and thus allows better route summarization within routing tables. Isolation of topology changes from other routers- Another advantage to using VLSM enabled route summarization in a large, complex network is that it can isolate topology changes from other routers.
What are the advantages of variable length subnet masking VLSM?
There is a few great things about variable length subnet masking VLSM. The main great thing about it is that you can get a membership.
Does VLSM support RIPv1?
ya if they are on both side then.. if one side then not..
Which default EIGRP configuration must be modified to allow a router to advertise sub-nets that are configured with vlsm?
Which default EIGRP configuration must be modified to allow an EIGRP router to advertise subnets that are configured with VLSM
Did you can calculate VLSM in class A ip address?
There is no difference between using class a or an other
Which additional piece of information is included in the updates of classless routing protocols to support the use of VLSM and discontiguous networks?
metric, network mask, neighbor router ID, administrative distance
What does VLSM allow a network administrator to do?
utilize multiple subnet masks in the same IP address space
What field was added to the rip message by rfc 1723 to add support for vlsm and cidr?
Subnet mask
What field was added to the rip message header by RFC 1723 to add support for vlsm and cidr?
Subnet mask
Which default EIGRP configuration must be modified to allow an eigrp router to advertise subnets that are configured with vlsm?
autosummarization
Which default eigrp configurations must be modified to allow an eigrp router to advertise subnet that are configured with vlsm?
autosummarization
