Last%20Class!

1
Last Class!

• Today
• where have we been?
• where is the networking world going?
• course evaluations

2
Where have we been?

• Signaling
• telephone network
• ATM
• Internet RSVP
• hard-state versus soft-state

3
Where have we been?

• Design Principles
• separation of control/data (signaling, ftp, http)
• randomization (CSMA-CD, router synch, RED, SRM,
  switch scheduling)
• indirection (multicast, mobile IP, SoS, i3)
• multiplexing packet level (WFQ, CBQ, priority),
  burst level, call level (routing in telephone
  net)
• virtualization (Internet, RON, IP-over-ATM, VPN)
• design for scale hierarchy (hierarchical
  routing)

4
Where have we been?

• Routers
• address table lookup
• packet classification
• input queue scheduling

• Traffic engineering and routing
• shortest paths routing
• linear programming
• minimum avenge delay routing
• nonlinear optimization

5
Where have we been?

• Congestion control and resource allocation
• optimization-based congestion control
• TCP fluids

• Network simulation
• discrete event simulation
• analyzing simulation output
• ns-2

• Measurement/management
• passive measurements (sampling)
• active measurements (network tomography)

6
Where are we headed a biased view

• network management (incl. measurement)
• service management
• application-level networks, overlays
• QoS not a solved problem end-end
• extensible nets (a.k.a active networking)
• new types of networks
• sensor nets, body nets, home nets
• security
• ease of use, deployment

7
Challenge on beyond the data plane

• Q data plane performance really the major
  roadblock?
• robustness
• complexity of control
• maintainability
• evolvability

• adaptability
• reconfigurability
• security
• manageability

the ities

• Fundamental advances here are hard!
• efficiency not always the most important
  measure
• little/no past work on the ities
• metrics and models still to be defined

8
Remember the class goals

• fundamental material
• material with a long half life
• material you will use 10 years from now

remember that you learned it here! email me when
you use class material in 10 years!
9
The end!