Review

1
Chapter 1

• Lecture 2

2
Review

• Topology Types
• Name the Physical Topologies and their logical
  topology
• Peer to peer network
• Client/server network
• LAN
• WAN
• CSMA/CD
• IEEE

3
Topics

• Wireless Topology
• Standards
• Standard Elements
• 802.3
• 802.5
• 802.11
• ANSI X3T9.5

4
Wireless Topology

• Requires a WAP (wireless access point) and a
  Wireless NIC
• Provides easy, flexible access
• No cables
• Slower than wired network
• Security is an issue

5
Standards

• Agreed upon rules for how the network operates
• IEEE Institute of Electrical and Electronics
  Engineers
• International body that developed the 802
  standards
• ANSI American National Standard Institute

6
Standards Elements

• Access
• Speed
• Media
• Topologies

7
802.3

• Ethernet standard
• Access method CSMA/CD (carrier sense multiple
  access with collision detection)
• Contention-based access
• All nodes have equal access
• Speed 10 Mbps
• Media Twisted pair cable, thin coaxial cable,
  thick coaxial cable, or fiber optic
• Physical Topologies Star, bus
• Logical Topology bus

8
802.3u

• Fast Ethernet standard
• Access method CSMA/CD (carrier sense multiple
  access with collision detection)
• Contention-based access
• All nodes have equal access
• Speed 100 Mbps
• Media Twisted pair cable, fiber optic cable
• Physical Topologies Star, bus
• Logical Topology bus

9
802.3z

• Gigabit Ethernet standard
• Access method CSMA/CD (carrier sense multiple
  access with collision detection)
• Contention-based access
• All nodes have equal access
• Speed 1000 Mbps (1 Gbps)
• Media Fiber Optic, twisted pair cable
• Physical Topologies Star, bus
• Logical Topology bus

10
802.5

• Token Ring (second most popular)
• Not contention-based
• A node must wait for a token to be able to
  transmit
• Lack of collisions (good for applications that
  require constant communication such as
  videoconferencing)
• Reduced speed because of overhead created by
  token process
• Requires expensive hardware and software
• MSAU multistation access unit (hub)

11
802.5 contd

• Access Token-passing
• Speed 4 Mbps or 16 Mbps
• ALL devices in the network must be set to the
  same speed
• Media Twisted pair
• Physical Topology star, ring
• Logical Topology ring

12
802.11b

• Access CSMA/CA
• Carrier Sense Multiple Access with Collision
  Avoidance
• Speed 11 Mbps, 5.5 Mbps, 2 Mbps,
  1 Mbps
• Media Radio frequency
• Physical Topology Wireless

13
802.11g

• Access CSMA/CA
• Carrier Sense Multiple Access with Collision
  Avoidance
• Speed 54 Mbps
• Media Radio frequency
• Physical Topology Wireless

14
802.12

• 100VG-AnyLAN
• Based on Ethernet std.
• Access Demand Priority
• Speed 100 Mbps
• Media Twisted pair or fiber optic
• Physical Topology star
• Logical Topology bus

15
X3T9.5

• FDDI (Fiber Distributed Data Interface)
• Developed by ANSI
• Access Token passing
• Speed 100 Mbps
• Media fiber optic
• Or Twisted pair (CDDI)
• Physical Topology star
• Logical Topology ring (dual ring)