CCNA Data CenterFunctions of Networking

» Networks are comprised of devices and endsystems, such as Hosts and Servers that areconnected enabling them to communicatewith each other.

What is a Network?

Example Network

» PCs/MACs» Network Interface Cards (NICs)» Switches» Routers

Physical Components of a Network

Sample Network Diagram

» Applications – Email, DB, UC, File/Web Services» Printing resources» Network Storage – NAS (CIFS/NFS) or SAN» Backup Devices – Tape or Network

Sharing of Resources

» Batch applications • FTP, TFTP, inventory updates (no direct interaction) • Bandwidth is required, but not critical» Interactive Applications • DB updates or Inventory queries (Human to

machine interaction) • Response time is important, but not critical» Real-time Applications • Voice and Video (Human to machine interaction) • Latency is critical

Application Interactions

» Availability – Measure of uptime» Scalability – Growth potential» Reliability – MTTR or MTBF» Security – Built-in protections» Speed – Data rates» Cost – CapEx and OpEx

Network Characteristics

Network Topologies

Wireless Topology