Computer network chapter 1
- 1. Technical Foundations of Computer Science • Fardin Fahim • Email: Fardin.Fahim@hariwa.edu.af • Phone: 0798740007 1
- 2. Pay Attention please • Mid-Term Exam 20 % • Final Exam 70% • Exercises 10% • Credit Points 5CP 2 Examination and Grading of the Lecture
- 3. Classroom rules • Ask questions at the end of the class • Respect and listen to your classmates • Respect and listen to the teacher • Raise your hand to speak • Be quiet when the teacher is talking • Be quiet when classmates are talking • Be on time • Finish your homework on time • Be respectful of others’ ideas • Cooperate with your classmates 3
- 4. Source For more study in details please read this book 4 https://drive.google.com/file/d/1NwZSDR8JrMZDVsZDpRsyo GEqNt6l7kYO/view?usp=sharing
- 5. What do you think about Network ? 5 Lets discussion
- 7. 7 Lets discussion Today networking has become an essential aspect of your job search. ... You must develop relationships and connections within your network to have more opportunities to advance your career. Attending meetings and social events hosted by your professional association is a great way to connect with people in your field.
- 8. What is Computer network Definition 1 A computer network is a group of computers that use a set of common communication protocols over digital interconnections for the purpose of sharing resources located on or provided by the network nodes. 8
- 9. What is Computer network Definition 2 A network can be defined as a group of computers and other devices connected in some ways so as to be able to exchange data. -Each of the devices on the network can be thought of as a node; each node has a unique address 9
- 10. What is the Nodes A physical network node is an electronic device that is attached to a network, and is capable of creating, receiving. 10
- 11. Building a Network A Computer Network is a digital telecommunications network which allows nodes to share resources. 11
- 12. Switch Switches ... Have many network interfaces/ports for end hosts to connect to ( Usually 24+) Provide connectivity to hosts within the same LAN ( Local Area Network ) Do not provide connectivity between LAN / Over the Internet. 12 Note: We will read more about LAN and WAN in the following chapters
- 13. 13 Herat Kabul
- 14. Router Routers ... • Have fewer network interface than switches. • Are used to provide connectivity between LANs. • Are therefore used to send data over the internet 14
- 15. 15 Herat Kabul
- 16. Firewall • Monitor and control network traffic based on configured rules. • Can be placed "inside" the network, or "outside the network. • Are known as "Next-Generation Firewalls" when they include more modern and advanced filtering capabilities. 16
- 18. Client A client is a devices that accesses a service made available by a server. 18 So … what’s server ?
- 19. Server A server is a computer or system that provides resources, data, services, or programs to other computers, known as clients, over a network. In theory, whenever computers share resources with client machines they are considered servers. There are many types of servers, including web servers, mail servers. 19
- 22. Interfaces 22 A network interface card (NIC) is a hardware component, typically a circuit board or chip, which is installed on a computer so that it can connect to a network
- 23. RJ-45 – (RJ=Registered Jack ) 23 RJ45 is a type of connector commonly used for Ethernet networking. It looks similar to a telephone jack, but is slightly wider. Since Ethernet cables have an RJ45 connector on each end, Ethernet cables are sometimes also called RJ45 cables. The "RJ" in RJ45 stands for "registered jack," since it is a standardized networking interface. The "45" simply refers to the number of the interface standard. Each RJ45 connector has eight pins, which means an RJ45 cable contains eight separate wires. If you look closely at the end of an Ethernet cable, you can actually see the eight wires, which are each a different color. Four of them are solid colors, while the other four are striped.
- 24. RJ-45 – (RJ=Registered Jack ) 24
- 25. Ethernet 25 • Ethernet is a collection of network protocols/standards. • For the purpose of this lesson, we will focus on types of cabling as defined by Ethernet standards. • Ethernet is a type of communication protocol that connects computers within what’s called a “local area network (LAN)” and a “wide area network (WAN).” LAN and WAN connect various devices, such as laptops and printers, within homes, buildings, and even small neighborhoods. • Users closely associate the term “Ethernet” with the physical connection between a computer or a router. That is because your laptop usually has an Ethernet port where you plug in one end of a cable and connect the other to a router. However, as mentioned, the word refers to the communication standard itself.
- 26. Network Protocols 26 • A network protocol is an established set of rules that determine how data is transmitted between different devices in the same network. Essentially, it allows connected devices to communicate with each other, regardless of any differences in there internal processes, structure or design. Network protocols are the reason you can easily communicate with people all over the world, and thus play a critical role in modern digital communications.
- 27. Quiz 27 Your Company wants to purchase some network hardware to which they can plug the 30 PCs in your department. which type of network device is suitable? 1: A Router 2: A Firewall 3: A Switch 4: A Server
- 28. Exercises 28 1. What is the difference between a network and the Internet? 2. what about the firewall on your compute ?
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