Feed Your Need for Speed

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Feed Your Need for Speed

• Doug Proutydprouty_at_cccoe.k12.ca.usContra Costa
  County Office of Education

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Definition of Network Speed

• Bandwidth size of pipe or Throughput
• Jitter - loss of transmitted data between network
  devices
• Latency transmission delay
• Collisions packets sent at the same time on a
  shared network

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Definition of Networks

• Local Area (Office, School, etc.)
• LAN extended uplink
• Wireless
• WAN LAN to LAN connectivity
• Internet

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Basic Network Configuration
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What Slows a LAN Network?

• Shared Ethernet (10baseT or 100baseT)
• Collisions
• Broadcasts
• Multicasts
• Too many users
• Wire Trouble

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What Slows a Wireless LAN

• Try to locate the hub away from Radio Frequency
  Interference (RFI) Electromagnetic Interference
  (EMI)
• 2.4GHz wireless phones (use 900 MHz)
• Wireless cameras/speakers
• Microwaves
• Electric motors and moving metal parts

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What Slows the Internet

• Pipes
• Server Capabilities
• QoS for VOIP and other MM
• Workstation
• RAM
• Connection Speed
• vvv

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How to Speed the LAN

• Shared Ethernet to Switched
• Upgrade/Test wiring
• VLANs to segment workgroups, printers, servers,
  (broadcasts).
• Gigabit backbone uplinks

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Shared vs Switched

• Segments traffic port by port
• Uses router tables
• Packets only flow to the port the device is on
• Forwards broadcasts to all devices
• Dedicates bandwidth per segment

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Shared vs Switched
Demo of Shared-Hub Network
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Shared vs Switched
Demo of Switched Network
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Wiring Trouble

• Try to avoid running cables parallel to power
  cables.
• Do not bend cables to less than four times the
  diameter of the cable.
• Do not over-cinch cables. You should be able to
  turn the tie with fingers.
• Keep cables away from copy machines, electric
  heaters, speakers, printers, TV sets, fluorescent
  lights, copiers, welding machines, microwave
  ovens, telephones, fans, elevators, motors,
  electric ovens, dryers, washing machines, and
  shop equipment.
• Avoid stretching UTP cables (dont exceed 25
  LBS).
• Do not run UTP cable outside of a building.  It
  presents a very dangerous lightning hazard!
• Do not use a stapler to secure UTP cables.  Use
  telephone wire/RJ6 coaxial wire hangers which are
  available at most hardware stores.

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Routing

• Converts from one language to another
• Segments broadcasts
• Provides security by hiding devices

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VLANsbroadcast and multicast traffic is contained

• One switch able to separate into multiple LANs
  (Virtual)
• Able to Segment Broadcasts
• Without a router, devices in one VLAN cannot
  communicate with devices in another VLAN
• VLAN-enabled adapter, a server can be a member of
  multiple VLANs. This reduces the need to route
  traffic to and from the server.

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VLANsbroadcast and multicast traffic is contained
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Caching ServersDoubles your bandwidth of a T1
line

• Caches HTTP and FTPtraffic (HTML pages,images,
  MPEG files, etc.)
• Supports SSL tunneling and cookies.
• Creates log files
• Filtering/URL blocking, automatic usage email
  reports.
• Browser-based management interface.
• Plug Play dont touch

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Resources
Cisco Networking Essentials for Educational
Institutions http//www.cisco.com/warp/public/779/
edu/media/pdf/edu_networking_essentials_2000.pdf
Search Networking.com http//searchnetworking.tec
htarget.com/ 8 Wire http//www.8wire.com
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Feed Your Need for Speed

• Thank You!
• Doug Prouty
• Contra Costa County Office of Education
• dprouty_at_cccoe.k12.ca.us