- Email: mandel@cse.yorku.ca
- Email protocol
- From your York computer science student account
- Subject line 3213...
- Identify yourself in the email by name and student number
- From your York computer science student account
- Office hours
- CSE3012
- Tuesday and Thursday 11:30 – 1pm
- Tuesday and Thursday 11:30 – 1pm
- Phone
- 416 736 2100 x40630
- 416 736 2100 x40630
- Course webpage
- http://www.cse.yorku.ca/course/3213
- http://www.cse.yorku.ca/course/3213
- Grade Weighting
- Subject to change
- 15% - Assignments & Quizzes
- 25% - MIDTERM
- 60% - FINAL EXAM
- Subject to change
Lecture 1
- What is a communication network?
- The equipment (software and hardware) and facilities that provide the basic communication service
- Virtually invisible to the user, usually represented by a cloud
- Equipment
- Routers, servers, switches
- Routers, servers, switches
- Facilities
- Copper wire, coaxial cables, optical fibre
- Telephone poles, ducts, conduits
- Copper wire, coaxial cables, optical fibre
- The equipment (software and hardware) and facilities that provide the basic communication service
- Network architecture
- The plan that specifies how the network is built and operated
- Architecture is driven by the network services
- Communication process is complex
- Network architecture partitions overall communication process into separate layers
- Layers are to be built from the ground up on well designed low level layers reaching up to the top which is the application level
- Layers are to be built from the ground up on well designed low level layers reaching up to the top which is the application level
- The plan that specifies how the network is built and operated
- Telegraph networks
- Courier
- Pony express, FedEX
- Pony express, FedEX
- Telegraph
- Message is transmitted across a network using signals
- From drums, beacons, mirrors
- To electricity, light
- Telegraph is quicker than courier
- From drums, beacons, mirrors
- Message Switching
- Network nodes were created where several optical telegraph lines met
- Store-and-forward operation
- Messages arriving on each line were decoded
- Next-hop in route determined by destination address of a message
- Messages arriving on each line were decoded
- Network nodes were created where several optical telegraph lines met
- Electric Telegraph Networks
- Message switching and store-and-Forward operation
- Key elements
- Addressing, routing, forwarding
- Addressing, routing, forwarding
- Optical telegraph networks became obsolete
- Message switching and store-and-Forward operation
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