1. EEL 4598/5718: Computer Communications
Wireless Information Networking Group (WING)
EEL 4598/5718: Computer Communications
Review 2

2. Layer Design Architecture
Wireless Information Networking Group (WING)
Layer Design Architecture
Seven Layer Reference Model
Their main functionalities
Mapping functionalities to corresponding layers
TCP/IP layering
Should be able to tie all together now
Some conceptual questions may cross multiple layers
Focus on fundamental concepts

3. MAC Basic understanding of channelization and Division Duplexing
Wireless Information Networking Group (WING)
MAC
Basic understanding of channelization and Division Duplexing
MAC protocols
Scheduling (centralized/deterministic MAC)
Random access
Aloha and slotted aloha
CSMA
CSMA/CD

4. Network Layer Two basic algorithms Distributed routing protocols
Wireless Information Networking Group (WING)
Network Layer
Two basic algorithms
Dijkstra algorithm
Bellman-Ford algorithm
Distributed routing protocols
Distance Vector Routing (DVR)
Link State Routing (LSR)

5. Transport layer Reliability issue State diagram End-to-end reliability
Wireless Information Networking Group (WING)
Transport layer
Reliability issue
End-to-end reliability
Why do we need ARQ protocols at transport layer?
Why and how to determine the round-trip time in TCP?
State diagram
Familiar with state transitions (operations of TCP protocol)

6. Congestion Control What causes congestion How to detect congestion
Wireless Information Networking Group (WING)
Congestion Control
What causes congestion
How to detect congestion
how TCP address this issue
How to address congestion (congestion control)
General strategies
TCP congestion control (slow start and fast decrease)

7. LANs Basic knowledge Bridges and routers What are they?
Wireless Information Networking Group (WING)
LANs
Basic knowledge
What are they?
What need to be addressed (PHY/MAC mostly)
Legacy LANs (particularly Ethernet)
Bridges and routers
Just basic ideas

8. Wireless Information Networking Group (WING)
Exam
One 8 ½ X 11 formula sheet is allowed and will be collected together with the exam paper. Important: Formulas ONLY on this sheet and may be penalized if other materials appear on this sheet.
A simple calculator is allowed. No data retrieval from the “calculator” is allowed.

9. Exam Similar format to the midterm Four big problems
Wireless Information Networking Group (WING)
Exam
Similar format to the midterm
Four big problems
First problem consists of a few conceptual fundamental questions
There are three other independent problems on specific topics

10. Wireless Information Networking Group (WING)
Q&A

11. Wireless Information Networking Group (WING)
It has been my great pleasure to work with you this semester. All the best for your future career!
Happy Holidays!!!