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: 07.2 Switched Media Issues
Select a size
07.2 Switched Media Issues
9/11/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/7/pages/2 1/1 Switched Media Issues Section 7: Troubleshooting Common Switch Media Issues As we learned earlier, switches operate at multiple layers of the OSI model. At Layer 1 of the OSI model, switches provide an interface to the physical media. At Layer 2 of the OSI model, they provide switching of frames based on MAC addresses. Therefore, switch problems are generally seen as Layer 1 and Layer 2 issues. Layer 3 issues, concerning IP connectivity to the switch for management purposes, could also occur.. These are some examples of everyday situations that can cause media issues: In an environment using Category 3 wiring, maintenance installs a new air conditioning system that introduces new EMI sources into the environment. In an environment using Category 5 wiring, cabling is run too close to an elevator motor. Poor cable management puts a strain on RJ45 connectors, causing one or more wires to break. Physical security could also be a cause of media issues. If you allow people to connect hubs to your switches or connect unwanted sources of traffic to the switch, then traffic patterns could change. This change wouldn't necessarily be related to media or a physical layer, but collisions could increase if you installed the hub and connected it to your switch. In an environment using fiber media, manufacturing problems such as microbends, macrobends, and splicing fibers that do not have their cores centered can cause light losses from the fiber. Damaged wiring and EMI commonly show up as excessive collisions and noise. Changes in traffic patterns and the installation of a hub will show up as collisions and runt frames. Up Next: Troubleshooting Media Issues