Wrapup

1
Wrapup

• What we covered
• Where the future is going?
• Web technologies practically transformed the
  Internet is 10 years
• For most people, Internet Web!!

2
Computer networks (Slides from Lecture 1)

• Goal Connect all these nodes

3
Computer networks (10 minute course overview)

• Network applications view

P2P Gnutella, Kazaa
Web server www.nd.edu www.abcparislive.com/eiffel_
tower_webcams.htm
Web browser
Bittorrent DAAP/Itunes Weed
IMAP Mail client
Directory server Ldap, NIS
File Server AFS/IFS
4
Computer networks (10 minute course overview)

• Problem 1 Direct link networks - physically
  connecting networks

Wireless LAN
Gbps Ethernet
Satellite
ADSL
5
Computer networks (10 minute course overview)

• Problem 2 Direct link networks - not all nodes
  are directly connected

Organization level
6
Computer networks (10 minute course overview)

• Problem 3 Internetwork - there is more than one
  network

Attbi.com
Ameritech.net
St marys
nd.edu
7
Computer networks (10 minute course overview)

• Goal Congestion control, Reliable. End-to-end
  protocols (e.g. TCP) etc.

8
Computer networks (10 minute course overview)

• Rest
• Wireless and ad-hoc networks
• TCP
• Internet Performance
• P2P (Napster, Gnutella etc) and CDNs (Akamai
  etc)
• Network performance and modeling
• Future directions

9
Future

• Commoditization and ubiquitous network access
• 10 years back, how did you access the network?
• School/job
• Dialup, Ricochet wireless (128 kbps), ISDN (,
  still )
• Laptops and PDAs were expensive
• Now
• School/job
• Dialup, 802.11 wireless, cellular (WAP
  access/3G), DSL, Cable, Satellite, Canopy
  Wireless, Power line, Bluetooth, IRDA etc.
• Devices are cheaper Laptops, PDA, Cellphones,
  Multimedia (wireless home theater)

10
Broadband penetration in the US (Pew study)
11
Internet penetration

• http//www.internetworldstats.com/stats.htmtop20

12
Future

• Commoditization and convergence
• Fiber to each home, VOIP, digital TV, every
  device on the Internet, garage door opener,
  car, etc. talk bluetooth or some such technology
• Airlines want to replace all wires
• Wireless everything
• Spectrum issues
• As we depend more on the Internet infrastructure,
  security (Virus, denial of services becomes a big
  issue)
• Can you trust my grandma or my garage opener to
  be secure?

13
High speed networks

• Gigabits across the nation

14
High speed networks

• Interplanetary/Delay Tolerant Networks
• GRID and cluster computing infrastructure
• Overlays for ease of deployment