This video covers subnetting, the backbone of the CCENT and CCNA objectives. No subnetting and no certification. Todd Lammle is well known for his simple yet effective technique on subnetting.
- Having one large network is not a good thing, because you have one large broadcast domain. How would you fix the out of control problem in a network like this? It's better to break it up and create four smaller manageable networks to create smaller broadcast domains. To make that happen, you would need subnets, which is the best way to break up a giant network into a bunch of smaller ones. Subnetting an IP network is an indispensable skill central to mastering networking in general. Forewarned is forearmed.
So prepare yourself. Being able to subnet quickly and accurately can be pretty challenging, and you'll need time to practice what you've learned to really nail it. I'm not kidding. This is so important, you should really graph this into your brain. Subnetting works by borrowing bits in the host section of a network address. By changing the length of the host address, we can create subnets of various sizes to serve users. This graphic shows a subnetted network. The 192.168.10x addresses is shown, each represents a subnet.
Without subnets, all users would be in one broadcast domain. Creating subnetworks is essentially the act of taking bits from the host portion of the address and reserving them to define the subnet address instead. This will result in fewer bits for defining hosts, which is something you'll always want to keep in mind.
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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