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Access Layer Provides a means of connecting devices to the network and controlling which devices are allowed to communicate on the network Distribution Layer Controls the flow of network traffic using policies and delineates broadcast domains by performing routing functions between VLANs Core Layer High-Speed backbone of the inter-network Scalability A desirable property of a network to handle growing amounts of traffic in a graceful manner Redundancy The duplication of devices, services, or connections so that , in the event of a failure, the redundant devices, services, or connections can perform the work of those that failed Performance A loosely defined networking measure based on throughput and error rates Security An encompassing term describing the prevention and means of prevention of unauthorized access to an entity, location, or system Manageability A measure of the lack of difficulty in managing network devices using network management software and protocols Maintainability A measure of the lack of difficulty in keeping network devices and associated software in working order VoIP The capability to carry voice traffic over an IP-based network with POTS-like functionality, reliability and voice quality. Convergence The speed and capability of a group of switches running STP to agree on a Loop-Free Layer 2 topology for a switched LAN QoS A measure of performance for a transmission system that reflects its transmission quality and service available PBX A digital or analog telephone switchboard located on the subscriber premises and used to connect private and public telephone networks Enterprise Network A large and diverse network connecting major sites within a company or other organization. PoE The powering of network devices over Ethernet cable Multi-Layer Switch Filters and forwards packets based on OSI layer 2 through Layer 7 information at wire-s[peed by utilizing dedicated hardware that stores data structures mirroring routing table, ARP table, and ACL information