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Overview/Description
Troubleshooting can be a time-consuming process. During outages, lost time comes at a price in terms of lost productivity or lost revenue. Knowing the environment in which you are troubleshooting is fundamental to efficient fault resolution. Any tool that can help reduce the time to diagnose and resolve problems quickly starts to yield a return on the initial investment. Optimizing the use of the tools built into Cisco IOS Software should therefore be a priority for any engineer that is involved in troubleshooting processes. Cisco IOS Software supports many technologies...
Overview/Description
IP routing is the core technology deployed in all current enterprise networks and is used in all areas of the network. For most connectivity problems in IP networks, the network layer is the point where troubleshooting processes start. Enhanced Interior Gateway Routing Protocol (EIGRP) and the Open Shortest Path First (OSPF) protocol are routing protocols that are commonly used in large enterprise networks. Troubleshooting problems related to the exchange of routing information is an essential skill for any network engineer who is involved in the implementation and...
Overview/Description
Smooth network operation and high network availability have become crucial to organizations because they depend on their network infrastructure for most of their business processes. Unplanned downtime can quickly lead to loss of productivity, loss of reputation, or even direct loss of revenue. To maximize the availability of the network, while at the same time controlling the associated costs, it is important to plan network maintenance processes and procedures carefully. In this course, the tasks that network engineers perform for maintaining large and complex networks...
Overview/Description
As enterprises become more and more dependent on their network infrastructure to support their business, the cost of network downtime has increased. When employees cannot perform their jobs due to network problems, the company loses productivity, and therefore, revenue. Network troubleshooting is an essential task that a network engineer needs to be capable of performing. The more efficiently and effectively problems can be diagnosed and resolved, the lower the impact will be to the business. In complex environments, troubleshooting can be a daunting task, and the only...
Overview/Description
Ideally, a single routing protocol is used to exchange routing information in an enterprise network. However, organizational requirements such as partnerships, mergers, technology migrations, and changes in policy can make it necessary to support the use of multiple routing protocols in the same enterprise network. In such situations, route redistribution between the different routing protocols is often necessary to achieve IP connectivity between the different parts of the network, and this adds an extra layer of complexity to a routed network. Enterprise networks may...
Overview/Description
An essential element in building highly available networks is the implementation of a First-Hop Redundancy Protocol (FHRP). FHRPs, such as the Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), and Gateway Load Balancing Protocol (GLBP) can prevent loss of connectivity by providing redundant default gateway functionality in a way that is transparent to end hosts. Performance issues can adversely affect a business as employees may not be able to service their customers correctly. But does the network cause the problem or does the client, a...
Overview/Description
Switched Ethernet has been the dominant LAN technology for more than a decade, and VLAN-based switched infrastructures are at the core of every campus network. A good understanding of the processes involved in Layer 2 switching and being able to diagnose and resolve Layer 2 switching problems in those environments is a fundamental skill that any network engineer should have. A primary tool in building highly available networks is the use of redundant devices and links. With these redundant links, bridging loops can be introduced, resulting in broadcast storms that can...
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