100 Mbps Topologies

• 100VG-AnyLAN (IEEE 802.12)
• 100 Mbps data rate.
• Star topology over Category 3, 4 and 5 UTP.
• Uses demand priority access.
• Combines element of traditional Ethernet and Token Ring and supports Ethernet and token ring packets.
• Faster than Ethernet
•  Demand priority access method => two priority levels, low and high
•  Intelligent hubs can filter individually addressed frames for enhanced privacy.
•  Expensive
•  Uses RJ-45.
•  Cable -  require 4 pairs wire
•  Categories 3, 4 UTP- 100m
•  Category 5 UTP   - 150m
•  Fiber-optic- 2000m
•  Uses star topology and defines how child hub can be connected to a parent hub to extend the network.
 Minimum length between nodes - 2.5m  Maximum segments- 1024  Maximum nodes per segment- 1  Maximum nodes for network- 1024  
• 100BaseT? (Fast Ethernet)
• Uses CSMA/CD on a star-wired bus.
• There are 3 specifications:
• 100BaseT4: Uses pair category 3, 4 or 5 UTP.
• 100BaseTX: Uses 2-pair category 5 UTP or STP.
• 100BaseFX: Uses 2-strand fiber-optic.

Ethernet Frame types

Ethernet 802.2 - NetWare 3.12 and 4.x  - IEEE 802.3 standard compliance.

Includes field in Ethernet 802.3 and LLC (Logical Link Control)

Ethernet 802.3 - NetWare 3.11 and before

Includes CRC

Ethernet SNAP (SubNetwork Address Protocol) - AppleTalk
Ethernet II - TCP/IP
 

Segmentation

• Can be performed with bridges or routers.
• Reduces traffic on network segments to increase performance.