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Network Guide to Networks 5th Edition

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May or may not travel through intervening connectivity device ... Figure 5-13 A 10Base-T network. Network Guide to Networks, 5th Edition. 27 ... – PowerPoint PPT presentation

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Title: Network Guide to Networks 5th Edition


1
Network Guide to Networks5th Edition
  • Chapter 5
  • Topologies and Ethernet Standards

2
Objectives
  • Describe the basic and hybrid LAN physical
    topologies, and their uses, advantages, and
    disadvantages
  • Describe the backbone structures that form the
    foundation for most LANs
  • Understand the transmission methods underlying
    Ethernet networks
  • Compare the different types of switching used in
    data transmission

3
Simple Physical Topologies
  • Physical topology
  • Physical layout of network nodes
  • Does not specify
  • Device types
  • Connectivity methods
  • Addressing schemes
  • Fundamental shapes
  • Bus, ring, star
  • Hybrid

4
Bus Topology
5
Bus Topology
  • Single cable connects all network nodes(No
    intervening connectivity devices)
  • One shared communication channel
  • Physical medium Coaxial cable
  • Passive topology
  • Node listens for, accepts data
  • Uses broadcast to send

6
Bus Topology (contd.)
  • Advantage relatively inexpensive
  • Disadvantages
  • Does not scale well
  • Difficult to troubleshoot
  • Not very fault tolerant

7
Ring Topology
8
Ring Topology
  • Circular network with clockwise data
    transmission
  • Active topology
  • Workstation participates in data delivery
  • Data stops at destination
  • Physical medium options
  • Twisted pair
  • Fiber-optic
  • Drawbacks
  • Malfunctioning workstation can disable network
  • Not flexible or scalable

9
Star Topology
  • Most popular physical topology
  • Most Ethernet networks are based on star topology

10
Star Topology
  • Node connects through central device
  • Physical medium options
  • Twisted pair
  • Fiber-optic
  • Advantages
  • Fault tolerance
  • Very Scalable

11
Logical Topologies
  • Describes data transmission between nodes
  • Most common bus, ring
  • Bus logical topology
  • Signals travel from one device to all other
    devices
  • May or may not travel through intervening
    connectivity device
  • Bus logical topology used by networks with
  • Physical bus topology
  • Star, star-wired bus topology
  • Ethernet

12
Logical Topologies (contd.)
  • Ring logical topology
  • Signals follow circular path
  • Ring logical topology used by networks with
  • Pure ring topology
  • Star-wired ring hybrid physical topology
  • Token ring

13
Hybrid Physical Topologies
  • Pure bus, ring, star topologies rarely exist
    because they are too restrictive
  • Hybrid topology are more likely
  • Complex combination of simple topologies
  • Several options

14
Star-Wired Ring
  • Combines a star physical topology with a ring
    logical topology
  • Benefit stars fault tolerance
  • Token Ring (IEEE 802.5) networks use this

15
Star-Wired Ring (contd.)
16
Star-Wired Bus
  • Combines a physical star with a logical bus
  • Advantages
  • Cover longer distances
  • Easily interconnect, isolate different segments
  • Drawbacks
  • Requires lots of cabling
  • Cost of connectivity device(s)
  • Hub-based Ethernet networks use this

17
Star-Wired Bus (contd.)
18
Backbone Networks
  • Connects hubs, switches, routers(not end-user
    devices)
  • More throughput needed on backbone than to the
    desktops

19
Serial Backbone
20
Distributed Backbone
21
Collapsed Backbone
22
Parallel Backbone
23
Switching
  • Logical network topology component
  • Determines connection creation between nodes
  • Three methods
  • Circuit switching
  • Message switching
  • Packet switching

24
Ethernet
  • Developed by Xerox in the 1970s, then improved by
    Digital Equipment Corporation (DEC), Intel, Xerox
    (DIX), and others
  • Excellent throughput for reasonable cost makes
    this the most popular LAN technology
  • All variations share common access method
    (CSMA/CD)

25
CSMA/CD (contd.)
26
Ethernet Standards for Copper Cable
27
Ethernet Standards for Copper Cable
28
Summary of Common Ethernet Standards
29
Ethernet Frames
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