Variable-Length Subnet Masking (VLSM) is used on every internetwork in the world. There is no other way to address an IPv4 network other than with VLSM. Todd Lammle teaches you his technique for creating, designing, and implementing a VLSM network.
So far, I've only created subnets…on my network that are of equal size.…This is great in theory but in practice,…it causes great waste by leaving IP addresses unused.…To minimize this waste, I can use subnet masks…of different lengths in various kinds of network designs.…This is called a Variable Length Subnet Mask, or VLSM.…By using VLSM, we can apply an IP Mask…to a router interface using just the right amount…of host bits, which provides connectivity…for all the attached LAN hosts…without having a bunch of wasted…IP addresses we're not using.…
Older routing protocols like RIPv1…don't have a field for subnet information,…so the subnet information gets dropped.…This means that if a router running RIP has a…subnet mask of a certain value,…it assumes that all interfaces within…the classful address space have the same subnet mask.…This is called classful routing,…and RIP is considered a classful routing protocol.…On the other hand, classless routing protocols…support the advertisement of subnet information,…which means you can use VLSM with routing protocols…
For more information on the CCENT exam, visit Cisco's website.
- Overview of internetworking
- The TCP/IP networking model
- Easy subnetting
- Managing Cisco IOS
- Managing Cisco networks and devices
- IP routing
- Layer 2 switching
- VLANs and InterVLAN routing
- Network address translation
Skill Level Intermediate
Internetworking devices4m 20s
3. Introduction to TCP/IP
4. Easy Subnetting
5. VLSM, Summarization, and Troubleshooting TCP/IP
6. Cisco Internetworking Operating System (IOS)
7. Managing a Cisco Internetwork
8. IP Routing
9. Layer 2 Switching
10. VLANs and InterVLAN Routing (IVR)
12. Network Address Translation (NAT)
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