The document discusses different network topologies including bus, ring, star, ad-hoc, extended star, and mesh. It also discusses common network layouts using star topologies with switches and twisted pair wiring. Various network equipment is outlined such as repeaters, hubs, bridges, switches, and routers. Bridges and switches use MAC address tables to forward frames while routers use routing tables which can be dynamically updated using routing protocols. The document concludes with notes on network diagrams and a correction regarding star ring topologies.

1. Chapter 2
Network Design Essentials
Networking Concepts – Eric Vanderburg ©2005

2. Topologies
 Bus
 Ring
 Star
 Ad-Hoc
(Wireless)
 Extended Star
 Mesh
 Star Bus
Networking Concepts – Eric
Vanderburg ©2005

3. Current Standard Layout
 Star
Topology
 Switches
 Twisted Pair wiring
Networking Concepts – Eric
Vanderburg ©2005

4. Equipment
 Repeater
 Hubs
Active (powered – regenerates signal)
 Passive (unpowered)

 Bridge
Source routing bridge – Token ring network has
mapped the frame course and it simply sends it on
its way
 Translation bridge – translates differing frame types
for different architectures (ATM, Ethernet)

Networking Concepts – Eric
Vanderburg ©2005

5. Equipment
 Switches
Cut-through switching – reads only the first part of
the frame to forward it.
 Store & forward switching

Reads entire frame before forwarding. Also does error
checking using the CRC field, discards if errors.
 Saves bandwidth because bad frames are not forwarded.
Requires faster switches
 Fragment free switching – reads enough to know it is not a
malformed or damaged frame

 Hybrids
(Hubs, Bridges, & Switches)
 Router
Networking Concepts – Eric
Vanderburg ©2005

6. Tables
 Bridging
Table
 Layer
2 table created on Bridges and
Switches of MAC addresses on each port
 Created dynamically or statically
 Routing
table
 Each
router creates its own and can receive
information about other routing tables from
other routers. Information received
depends on the protocol used.
Networking Concepts – Eric
Vanderburg ©2005

7. Network Diagrams
Networking Concepts – Eric
Vanderburg ©2005

8. Network Diagrams
Networking Concepts – Eric
Vanderburg ©2005

9. Book Corrections
 Star
Ring is not a topology
(Physical Star, Logical Ring)
Networking Concepts – Eric
Vanderburg ©2005

10. Book Corrections
 Star
Ring is not a topology
(Physical Star, Logical Ring)
Networking Concepts – Eric
Vanderburg ©2005