What email address or phone number would you like to use to sign in to Docs.com?
If you already have an account that you use with Office or other Microsoft services, enter it here.
Or sign in with:
Signing in allows you to download and like content, and it provides the authors analytical data about your interactions with their content.
Embed code for: 09.2 Benefits of Subnetting
Select a size
09.2 Benefits of Subnetting
9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/9/pages/2 1/2 Benefits of Subnetting Section 9: IP Addressing and Subnets A subnet, or subnetwork, is a subdivision of an IP network. The process of creating these subdivisions is called subnetting. Subnetting is useful for several reasons: Subnetting enables you to create multiple logical networks from a single Class A, B, or C network address. Subnetting reduces network traffic, which can improve network performance. Smaller networks (subnets) are easier to manage. Subnetting enables you to more easily apply network security policies. Subnetting enables you to use different physical media, such as Ethernet and Token Ring. For example, assume that a company occupies a threestory building. On each floor, there are many offices that contain PCs and other network devices. All network devices throughout the building are connected via switches and are on the same network. As the company grows, the building becomes more crowded, and more computers are added to the network. As the hallways become more congested, so does the network. All devices share the same bandwidth and broadcast domain, and it is difficult to apply security policies because there are no boundaries between devices. 9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/9/pages/2 2/2 On this switchconnected network, each device sees all the broadcasts. If there are hubs on the network, heavy traffic can cause frequent collisions when two or more devices are transmitting simultaneously. The devices detect the collisions, stop transmitting, and then begin transmitting later, at random intervals. To users, this process is perceived as the network slowing down. To reduce human congestion, the company might assign each of its three departments to a separate floor and create separate break and mail rooms for each floor. Similarly, the company could reduce network congestion by subnetting. Although the switches in the network are improving network performance, adding a router to the network and implementing subnetting would improve it even more. In addition, the company could take advantage of all the other benefits of subnetting. Using subnetting would require the company to modify its current IP addressing scheme, but it would not require the company to acquire an additional network address. The following figure shows how the company might create three subnets. Regardless of the number of subnets created, all of them can be connected to the Internet by a single router. The details of the internal network environment and how the network is divided into multiple subnetworks are inconsequential to other IP networks. Up Next: Subnet Masks and Binary Numbers