ccna 9ut

ccna 9ut.Network and server downtime can cost a company large sums of money and result in lost productivity. At the same time, the amount of information that is managed and stored each year can increase dramatically. SANs provide a way to address the increasing amount of data that must be stored in an enterprise network environment. By implementing a SAN, usersoffload storage traffic from day-to-day network operations and create a direct connection between storage media and servers. SANs in enterprise infrastructures are evolving quite rapidly to meet three major business needs. Reduce capital and operating expenses. Improving flexibility to support changing business priorities, application needs, and revenue growth. Improved remote replication, backup, and recovery to meet regulatory requirements and industry best practices.Cisco provides an enterprise-class approach to deploying scalable, highly available, and more manageable SANs Cisco's intelligent SAN solutions are an integral part of an enterprise data center architecture. CiscoSAN solutions provide the preferred method for accessing, managing, and protecting information resources across multiple SAN transport technologies. These methods include integrated Fibre Channel, Fibre Channel over 1P (FCIP), Internet Small Computer System Interface (iSCSI), Gigabit Ethernet, or fiber optic networks.6.4.6.2 SAN Transport TechnologiesAll major SAN transport technologies are based on the SCSI communication model. In many ways, the SAN can be described as a convergence of SCSI and networking. The SCSI command protocol is the de facto standard widely used for high-performance storage applications. The command portion of SCSI can be transported over a fiber optic transport channel SAN or encapsulated within IP and transported over an IP network.Here are the three main SAN transport technologies.Fibre Channel-This technology is the preferred host-to- SAN connection for SAN transport. Traditionally, a SAN requires a separate dedicated infrastructure to interconnect hosts and storage systems. The preferred transport protocol for this interconnection is Fibre Channel. Fibre Channel networks provide a serial transport for the SCSI protocol.iSCSI-Maps SCSI over the TCP/IP protocol. which is another host-to-SAN connectivity model that is typically used on LANs. iSCSI leverages investments in existing IP networks to establish and extend SANs o By using TCP/IP to transfer SCSI commands, data, and status between hosts or initiators and storage devices or targets, such as storage subsystems and tape devices.FCIP - The popular SAN-to- SAN connectivity model is often used on WANs or MANs (metropolitan area networks). SAN designers can use the open-standard FCIP protocol to break the distance barrier of current Fibre Channel solutions, allowing SAN silos to interconnect over extended distances.180 Chapter 6 Protecting the Local Area Network