Chapter 12Chapter 12

Advanced Networking Devices

• Discuss the four logical topologies as defined by CompTIA

• Configure and deploy VLANs • Implement advanced switch features

ObjectivesObjectives

• Home Routers-Really two devices in one – Four-port switch – Router

• The combination is more than the individual parts. The home router becomes an advanced device. Works at multiple layers of the OSI seven-layer model

• Logical Network Topologies goes beyond the description of either physical or signaling topologies – Another term (beyond CompTIA) is “software

architecture model” – Terms refer to the role computers play in a

network • Which computers act as servers • Which computers act as clients

• Client/Server – Earliest networks used this model – Certain systems acted as “dedicated” servers • iDedicated means serving was all they did • Offered up files, folders, Web pages, etc

– Client systems never functioned as servers • Clients could only see the server • Clients could not see other clients • Could only share data with each other by sharing on

the server

• Peer-to-Peer – Microsoft’s first versions of network-capable

Windows introduced this model – Any system acts as a server, a client, or both – Depends on configuration – PCs tend to be configured as both clients and

servers

• Client/Server and Peer-to-Peer Today – Peer-to-peer has been adopted by every modern

operating system • Windows • Linux • Macintosh

• Newer implementations offer more robust security – User accounts – More advanced permissions – CompTIA tests on classic client/server and peer-to-peer

• VPN – Originally remote connections were very

expensive – Telephone connections for single system

connection to a LAN – Dedicated private connections (also from the

phone companies) to connect LAN to LAN.

• VLAN – Virtual Local Area Network (VLAN) – Used by all but smallest LANs – Remote incoming connections – Public Web or e-mail servers – Wireless networks – String of connected switches – Tremendous amount of traffic – Security issues

• Trunking – Process of transferring VLAN data between two

or more switches – Port on each switch configured as a trunk port

• Quality of service (QoS) – Controls bandwidth use for certain devices and

applications – Rules-based polices prioritize traffic • Control bandwidth to specific

– Protocol – PC – VLAN – IP address