In this video, Todd Lammle shows you his simple method to subnetting by using what he calls block sizes. He has been using this method in large enterprise networks for 30 years, as well as teaching and writing about it. Spend some time going through the examples, and follow up by reading his book to really build a strong foundation.
- Now that we know what subnets are,…let's go ahead and take a look at some specific subnets…and learning how to subnet.…First let's talk about subnet mask.…For the subnet address scheme to work,…every machine on the network must know…which part of the host address we used…as the subnet address.…This condition is met by assigning a subnet mask…to each machine.…As shown in the graphic, a subnet mask is a 32 bit value…that allows the device that's receiving the IP packet…to distinguish the network ID portion of the IP address…from the host ID portion of the IP address.…
So if we look at a Class A default,…we're saying the first bite represents the networks.…The last three bites, or 24 bits, represents the host.…In a Class B default mask, the first two bites…represent the networks or network…and the last two bites represent the host.…And at Class C, as we know, the first three bites…represent the network and the last bite represents the host.…Now, why is this important?…Because where do I start subnetting?…Where do I take bits from to create a subnet mask…
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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