Data communications Day 01: Topics covered

Data communications

1. Physical layer
2. Data-link layer
3. Network layer
4. Transport layer
5. Session layer
6. Presentation layer
7. Application layer
8. Wireless networks
9. Network security
10. Virtual LAN

Application layer
1. Wireshark
2. HTTP
3. VOIP
4. Email SMTP, POP

Datalink layer
1. Ethernet protocol (CSMA/CD)

Network layer
1. IP addressing
2. IP protocol
3. Subnetting

Transport layer
1. TCP
2. Flow control

1. Define LAN (Local Area Networks)

• Group of computers connected on the same cable
• Group of computers are in a confined area
• Group of computers communicate with a high speed data transmission

2. Reasons to develop LANs

• Share information (e.g. access same data files, exchange information via emails) leading to improve decision making
• Share resources (e.g. printers, scanners, applications) leading to save costs

3. How do LANs differ from MANs, WANs, and BNs?

4. Why are network layers important?

5. Wavelength vs Frequency