Week 5 : Wireless Technology & Internet Infrastructure.

Wireless Technology.

Wireless signal (radio) signals are used to send data through the airwaves between devices, instead of physical cable. Wireless technology is generally used for mobile IT equipment. It encompasses cellular telephones, personal digital assistants (PDA's) and wireless networking.

Cisco's Wireless Data Initiatives. 
  
-Point-point / multipoint wireless

-Wireless LAN

 

-Wireless local loop

-Mobile Cellular voice / Data Communications

 

Uses of wireless technology :

1. Mobile users can use their cellular phone to access e-mail anywhere and anytime.

2. Travelers with portable computers can connect to the internet through base stations installed in airports, railway stations, and other public locations.

3. At home, users can connect devices on their desktop to synchronize data and transfer files.

Type of wireless technology :

 1. Wireless wide area networks (WWANs)

 2. Wireless metropolitan area networks (WMANs)

 3. Wireless local area networks (WLANs)

 4. Wireless personal area network (WPANs)

Wireless technology

1. Infra Red

2. Wireless local area networks (WLANs) , WiFi

3. Broadband wireless

4. Bluetooth

5. WiMAX - to extend the range of wireless network.

Internet Infrastructure.

What is Internet?

A global collection of network. Interconnected computers work by transmitting data through a special type of packet switching which is known as the IP ( internet protocol). When you connect to the internet, your computer becomes part of a network.

Internet VS World Wide Web

A Hierarchy of Networks

-from a single computer to LAN

-from LAN to ISP

-ISP to WWW

 Internet Protocol

Every machine on the internet has a unique identifying number, called an IP address. The IP stands for internet protocol, which is the language that computers use to communicate over the internet. A protocol is the pre-defined way that someone who wants to use a service talks with that service. The "someone" could be a person, but more often it is a computer program like a web browser.

Type of internet connection and access

1. Dial connection

2. Cable

3. Satellite internet access

4. Fixed wireless

5. Broadband

6. Mobile wireless 

  

Before the class dismiss, DR Dayana teach "how to change theme" at gmail.com. Also, how to change photo. Dr Dayana also told about important of nickname IP address. It is because to easy people find by search name and very important to interview especially a professional job. Dr Dayana also told to put a formal photo. By this class, I more understand about e-mail and important of IP address. THANK YOU :D 

  

 

Week 4 : Computer Networking (Part 2)

Defining Computer Networking

Computer network is a collection of computers and other hardware devices so that network users can share hardware, software, data and they can communicate with each other electronically. 

 

Type of Network

 Many types of network depending on the geographical area.

1. Local Area Network (LAN) - Covers relatively small geographical area. Example: home, school and office.

2. Metropolitan Area Network (MAN) - Design to service a metropolitan area. Consist of multiple LAN. Example city.

3. Wide Area Network (WAN) - Covers large geographical area and consist of two or more LAN connected together using communication technology internet is the largest WAN.

4. Personal Area Network (PAN) - Network of personal devices. Example: printer, mobile devices, wired and wireless.

 

Network Component 

1. Hots/ End Nodes

Refers to the data source and the data destination. Example: personals computers, terminals, workstations and automatic teller machine. 

 

2. Transmission media(Cable)

For transmitting data and control signals. Responsible for sending electric or signal through spesific media. It can be bounded(wired) or unbounded (wireless) media.  

 

3. Network Electronic Device

Responsible to control data from source to destination. To connect multiple network together or to connect computer or network to the internet. Example: bridges, routers, multiplexers, switches, hubs, gateways and front end processors. 

4. Application/Software

The protocol determines the rules and procedure to send data, terminate data, interpret data, present data and control mistakes. Software in the network function to ensure data is delivered at respective destination. To control data transmission. 

5. Network Architecture Standard & Protocol. 

To ensyre interoperability between various devices and equipment made by different vendors. Also, to enable devices made by different companies to work or communicate with each other. Example : TCP/IP, Ethernet (802.3), Wi-Fi (802.11), and WiMAX.

Networking Architecture

Network architecture is the way they are design to communicate.

2 types of network architecture

1. Client/server networks

Client = computers that request or utilize network resources.

Server = processing the request by client.

Retrieves file from server : download, transfer from client to server : upload

2. Peer to peer network

No central server. Have direct access to other devices attached to the network. Example itunes, bluetooth between handphone.

Network Topology

Study of the arrangement or mapping of the element (links, nodes) of a network, especially the physical (real) and logical (virtual) interconnections between nodes.

Physical network topology

1. Linear bus 

 

2. Ring 

 

3. Star

 

4. Tree / Hybrid

 

5. Mesh

2. Logical Network Topology

2 types of logical network is shared media topology and token-based topology. 

Before the class ended, we've been asked to make a slides using google slide about network topology. Our class has been divided by 5 groups. For example, linear bus topology, ring topology, star topology, tree topology and mesh topology. I and my friends have to make slide about ring topology using google slide. Google slide very simple because can make assessment together with friend through online with different place.

 

https://docs.google.com/presentation/d/1cCRtsGGo0SZfNXQEOy-GJfZKvWdX2PPAdDZr0zrrtiU/edit?usp=sharing 

Week 3 : Computer Networking

What do I want from this class?
I want to learn more about computer networking for my career as a teacher in the future that are technologically advanced.

What might I expected from this class?
I expected that I will learn about type of cable, cable connector and compare wired and wireless network in terms of speed,cost and reliability.

Why this class is relevant to my study?
This class very relevant to my study because improve my knowledge about computer networking and world today is full advanced with technology especially communication and networking.

What new thoughts have come into my head so far in this class?

 I learn about how to set up network by network components. For example, Printer(1), computer(2), personal laptop(1), concentrator/hubs(1), server(1), wires and network interface card(2). This is my example answer. ( NIC must with computer)

Set up network.

COMPUTER NETWORKING

Wired Vs Wireless network  

Wired network-connected by using cables. Example using conventional telephone cables. 

Wireless network-use signals to transfer data. Example television and radio network and cellular network.

For home connection,

    Speed-Wired network better than wireless network.

    Cost-Wired network

    Reliability-Wireless network. 

Type of Cable.

1.Coaxial cable - carry large number of high-speed video transmission at one time.

2.Fiber optic cable - Transfers data represented by light pulses (billions of bit per second).

3.Twisted-pair cable

   i)Shielded twisted pair (STP)

  ii)Unshielded twisted pair (UTP)

 

Cable Connector

1.Coaxial cable connector - Bayonet-Neill-Concelman (BNC)

2.Fiber optic cable connector - ST & SC Connector

3.UTP Cable connector - RJ-45 Connector ( RJ = Registered Jack )

Network Hardware. 

1. File server - fast computer

2. Workstation - computer that connected to a network. Example laptop.


3. Network Interface Card (NIC) 
 -provides the physical connection between the network and the computer workstation.
 -three most common network interface connection are Ethernet cards, localtalk connectors (macintosh computer-apple), and token ring cards ( nine pin Din type connector).

4. Concentrator/Hubs
-central connection point, lots of extra network traffic, network less efficient.

5. Switch

-connect the devices together via networking cables and to facilitates communication between the devices, but they differ in how they transfer data.

When to use switch? hubs?

Switch - network larger ( more 50 users)

Hubs - small network (less 30 users)

6. Repeater

-to boost the signal with a device called a repeater. The repeater electrically amplifies the signal it receives and rebroadcasts it.

7. Bridges - connects multiple network segments.                                                                                   

  

8. Routers - Connectors that used to link different networks. Like bridges but more advanced. 

Before the class dismiss, we've been asked to set up network by these network components.

-Printer(1), computer(2), personal laptop(1), concentrator/hubs(1), server(1), wires and network interface card(2).*(NIC must with computer)