Organization connectivity

1
Organization connectivity
Skills none IT concepts structure within an
organization LAN, options for connection to the
Internet
This work is licensed under a Creative Commons
Attribution-Noncommercial-Share Alike 3.0
License.
2
Where does this topic fit?

• Internet concepts
• Applications
• Technology (communication)
• Implications
• Internet skills
• Application development
• Content creation

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Connectivity within the organization LAN
How does the LAN connect to the Internet?
The Internet
LAN
How are the computers connected inside the LAN?
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Campus fiber backbone
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The campus LAN
Building 1
Building 2
Central node (ERC building)
Internet
Building 3

1 gbps links star topology
Building n
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Inside each building
To the central campus node
Main switch
1 gbps

48 port switch 1
48 port switch 2
48 port switch n
48 port switch 3
100 mbps
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The central campus node
Data center
Campus router
Firewall
CSU router
ATT
Downtown LA
Responsibility of CSUDH
Links from campus buildings
1 gbps
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User to Internet
48 port switch
Building switch
Central node
Data center
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Data center
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Air conditioning and backup power on the roof
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The link to the data center
How does the LAN connect to the Internet?
Internet
LAN
How are the computers connected inside the LAN?
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Traditional leased line speeds
Designation Speed (mbps)
T1 1.5
T3 43
OC3 150
OC12 601
OC24 1,202
OC48 2,405
OC192 9,621
OC768 38,486
OC3072 153,955
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Ethernet LAN evolution
Fiber and copper wire 100 gbps 100 kilometers
IEEE 802.3, 1982, thick, rigid coax 10 mbps 185
meters
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Metropolitan area ethernet
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Wireless connectivity
Satellite
Terrestrial
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Service level agreement
Speed Latency (ping time) Reliability Time to
repair Compensation
Sample service level agreement
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A few questions
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How does the speed of the of links between wired
computers and building switches compare to that
of WiFi? How does the speed of the of links
between wired computers and building switches
compare to that of the links between
buildings? How does the speed of the links
between buildings compare to that of WiFi? How
does the speed of the link between the campus LAN
and the downtown datacenter compare with WiFi?
19
Organization connectivity
Skills none IT concepts structure within an
organization LAN, options for connection to the
Internet
This work is licensed under a Creative Commons
Attribution-Noncommercial-Share Alike 3.0
License.