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LAN, WANs and More
LAN
• Switch
• Router
• Server Farm
• Wireless Access
• High Speed Connectivity
• Firewall
• Local Control
• Gateway
MAN
• Connecting LANs
• High Speed
• Point to point connection
• Dedicated cable
• Wireless Beam
• Infra Red or laser
• Normally restricted to a small geographical area
• Otherwise similar to LAN
WAN
• International
• Lower Speeds
• Internet technologies used
• Cloud computing
• Less or no control
• PPTP (Point to Point Tunnelling Protocol)
• VLAN technologies
• Encryption
Video: WAN, Man and LAN
• https://www.youtube.com/watch?v=Z8sqPruWG6Y
PSTN and LAN
• PSTN Public Switched Telephone Network
• Bandwidth: 300Hz to 3.4kHz
• Cables were optimised for analogues telephony
at low f
• On the pure PSDN system data speeds of
56kbps were achieved
• New technologies improved the capacity of 50s
infrastructure by introducing broadband
• PSTN WANs are still used for extreme situations
PSTN Circuit used as a backup
connection
ADSL: Old and modern technology
combined
VOIP replacing PSTN
802.3 – Ethernet Standard
"Grandaddy" of the 802 specifications. Provides asynchronous networking using "carrier sense, multiple access with collision detect" (CSMA/CD) over coax, twisted-pair copper, and fiber media. Current speeds range from 10 Mbps to 10 Gbps.
Ethernet
• CSMA/CDcarrier sense multiple access with collision detection
• Analogy:crossroads without any rules and driving blindly into it
• Weakness of the standard in generating collisions has been alleviated through Data Switch technologies
802.5 Token Ring Standard
• The original token-passing standard for twisted-pair, shielded copper cables. Supports copper and fiber cabling from 4 Mbps to 100 Mbps. Often called "IBM Token-Ring."
Token Ring
• The ring is actually established in an MSAU – multi station access unit
• The unit looks like a switch or a hub
• Speeds are only 4 Mbps and 16Mbps
• The standard has been less used in the 90s with the advent of data switches.