CoE 542 Lesson 4 - OSI Model

OSI (Open System Interconnect) - reference model

Headers and Trailers
Packet or Frame


7 Layer of OSI Model

1. Application- used by human or software
2. Presentation- encryption, format
3. Session- establish, maintains, terminate connection
4. Transport- delivery of the entire message
   segmentation and reassembly 
5. Network- source-to-destination delivery of a packet
   logical address
   routing
6. Data Link- node-to-node delivery of a packet
   physical address
7. Physical- data transmission, media, signal, etc.

CoE 542 Lesson 3 - Protocols

Protocols - set of rules

• syntax
• symantics
• timing

Standards- "interoperability"

1. "de facto"- supported by users/ consumers
2. "de jure"- created by a standard making body/
   

Standard Organizations

1. ISO
2. ITU-T
3. ANSI
4. IEEE
5. EIA

Regulatory Agency

1. FCC

CoE 542 Lesson 2 - The Internet

The Internet

USDoD
packet switch network
ARPA
ARPANet
Internet

International Service provider
National Service Provider
Regional Service Provider
Local ISP

Internet Society

1. IETF(Internet Engineering Task Force)- short term solution
2. IRTF(Internet Research task Force)- long term solution

TCP/IP

CoE 542 Lesson 1- Basic Concepts

This is an introduction to the basic concepts of Data Communication and Networking. Topics outlined is referenced from the book Data Communication and Networking by Behrouz Forouzan.

Data Communication - exchange of data
Networking - "share resource"
Resource - files, printer, CPU, memory, etc.
Distributed Processing-  task is divided

Fundamental Characteristics of Data Communication

1. timeliness
2. delivery
3. accuracy

Network Criteria

1. Performance
2. Reliability
3. Security

Components of Communication

1. sender- computer or node
2. receiver- computer or node
3. media- wired or wireless
4. message- signal transmission
5. protocol- language of communication

bit (mbps) v.s. Byte (MBps)

baud rate v.s. bit rate/ signals per second vs bit per second

Transmission Modes

1. Simplex- one direction at all time
2. Half-duplex- both direction one at a time
3. Full duplex- Both direction at any time

Line Configuration

1. Point-to-point- "dedicated" line
2. Multipoint- "shared" line

Physical Topology- refers to the physical layout of the network

1. bus- "broadcast"/ multipoint
2. ring- "point-to-point"
3. star- hub
4. mesh- dedicated line
   full mesh- each have dedicated line (no. of lines = (no. of nodes) (no. of nodes -1) / 2)

Categories of Network

1. LAN
2. MAN
3. WAN

Data Communication and Networking

Data Communications & Networking By Forouzan from guestfb8f8d5