Computer networks are a means by which computers are interconnected to share data and information, resources and all other network devices such as printers.
Computers, as we now know, apply to all fields of activity, be it agriculture, education, medicine, technology, transportation, etc. So there is an obvious need for an organization to have an internetwork of its computers to further help share and retrieve data and efficiently manage and use computing resources.
Today's world is a global village with the advent of the Internet, which is a combination of millions of interconnected computer systems to share information. The growth of the internet has sporadically improved as it provides useful information and platforms for all classes of people, business people, students, artisans, artisans and all other categories of people and professions.
Types of computer networks
Computer networks can be classified based on different attributes such as physical size, connection mode, device types, etc. To ease the introduction, let's look at their classification in terms of physical size. You will often hear the following.
- Local Area Network (LAN)
- Metropolitan Area Network (MAN)
- Wide Area Network (WAN)
Local Area Network (LAN)
LAN a type of computer network that generally deals with a small area and most often restricted to one location; for example, networking an Internet café, a computer lab, or simply building an organization.
The network of a home or a small building is known as SOHO LAN (Small Home Office Local Area Network). In this type of network, there are usually few computers and other network devices, for example switches and routers involved (details about the devices are explained below).
Metropolitan Area Network (MAN)
MAN is a type of computer network that is larger than a LAN but does not reach a WAN (Wide Area Network). It is an intermediary between LAN and WAN. It covers more areas than a LAN and has a larger number of computers; it can also be seen as a combination of more than one LAN.
In this type, the use of routers is well employed for network segregation and integration, and requires more administrative controls due to their size.
Wide Area Network (WAN)
This is the biggest form of computer network covering thousands of acres of land area. You can cross states and countries; there is no limit to the number of computers and devices or network resources involved. WAN employs the use of all necessary network devices like switches, routers, hubs, bridges, repeaters, etc. This type of network usually requires full-time administrative verification, as its failure can lead to massive data loss or theft.
An easily familiar example is the Internet.
Networking devices and terms
There are many networking devices available and many terminologies are used. Let's find out about them the following.
A router is used to connect different networks. That is, for two or more LANs to be interconnected, a router is needed. It is responsible for determining the route of the sent data. The router is considered a layer three device, because it operates at layer 3 of the OSI (Open Systems Interconnection) communication model and uses IP addresses in its interface.
The switch is responsible for connecting computers to each other. The switch is an important backbone of LANs. As it provides a way for different computers to be interconnected. This device is known to operate at layer 2 of the standard OSI communication model. So it's a layer two device. The switch is an improved form of a jumper.
you can have at home. A wireless router helps you connect multiple devices without cables.
Commonly known as wifi network and used to distribute internet to various devices at home, shop or office.
In wireless networks, an access point is used instead of a switch.
OSI model concept designed to standardize the communication system between devices on a network. It consists of seven layers.
- data link
The hub is also known as a multiport repeater due to its resemblance to a repeater, although there are specific devices called repeaters. The hub was also used to connect computers and share data between them, but now it is mainly used as a repeater to repeat signals over long distances. The hub is known as a layer one device (in the OSI model), as is the repeater.
Ethernet for the cabling system and ports involved in the network. Network cables are called Ethernet cables and are used to connect a computer to all other network devices or for a computer-to-computer connection. The most common of these is the RJ45 connector.
On Cisco devices, the Ethernet ports on a router or switch are known as Fast Ethernet ports, most of which are indicated by letters and numbers, depending on their arrangement. For example, the first Ethernet port on a router is labeled Fa0/0, while the first Ethernet port on a switch is labeled Fa0/1.
IP stands for Internet Protocol.
The IP address is a 32-bit address given to computers, switches, and routers so that they can be easily located by other devices on the network. It currently exists in two versions, which areIPv4(IP version 4) andIPv6(IP version 6).
IPv4 is the most used. It is written as a set of 12 numbers separated by dots in three(s), for example 192,168,231,254 or it can be written shorter if the first number is zero i.e. 010,002,001,001 can be written as 10.2.1.1
Currently, IPv6 is not very common in use. It was developed to address the challenges of increasing IP address depletion. It is written in the form 2031:0000:130F:0000:0000:09C0:876A:130B. Contains numbers and alphabets.
Do you want to know your public Internet IP? try thismy ip tool.
The MAC (Media Access Control) address is a 64-bit manufacturer's address engraved on your computer's motherboards, routers, and switches. Each computer, switch, or router has a unique MAC address. This is a single source of identity for electronic devices for easy recognition. It is as unique as the fingerprint of human beings.
The subnet mask helps determine the class of an IP address as it is assigned to computers, routers or switches along with an IP address to clarify its class or network.
- For class A IP address: subnet mask, it is written as 255.0.0.0
- For class B IP address, subnet mask is written as 255.255.0.0
- For class C IP address, subnet mask is written as 255.255.255.0
Domain Name Service (DNS)
DNS is a service for translating or transforming human readable names into IP addresses and vice versa. you can use aDNS record lookupto find out the resolution IP address.
Dynamic Host Configuration Protocol (DHCP)
DHCP is a service for automatically assigning IP addresses to host devices such as computers. This function is performed by a router (only when configured to do so).
Rede local virtual (VLAN)
VLAN is a method of logically separating a LAN and making different networks appear to be on one. Physically it is a network, but logically they are different networks. This is done via a switch (only when configured to do so).
Wi-Fi is a method of wirelessly connecting computers to a network, i.e. wireless networking, which involves the use of Wi-Fi enabled computers, access points, wireless routers, etc.
It is the ability of a network to expand in such a way as to make room for more devices to interconnect and join the network without causing major changes to the entire network.
I hope this gives you an idea about basic computer networking terms. If you are non-technical and interested in learning more about networking, check out this brilliantonline course.
What are the networking questions and answers? ›
- How are Network types classified?
- Explain different types of networks.
- Explain LAN (Local Area Network)
- Tell me something about VPN (Virtual Private Network)
- What are the advantages of using a VPN?
- What are the different types of VPN?
- What are nodes and links?
- What is the network topology?
- Identify network devices and hardware.
- Describe the roles of a firewall.
- Understand Cisco certificates.
- Use ipconfig, ping and traceroute commands.
- Check basic network connectivity.
- Have enough knowledge to join more advanced training.
Computer networking refers to interconnected computing devices that can exchange data and share resources with each other. These networked devices use a system of rules, called communications protocols, to transmit information over physical or wireless technologies.Is intro to computer networking hard? ›
Computer Networking Can Be a Challenge
You'll also need to know how to develop LAN and WAN networks and what potential network issues look like. These technical concepts can be challenging at times, especially as you gain experience in the field.
- Be authentic, reciprocate, and think about the long-term relationship.
- Prepare, practice, and perfect your approach.
- Take time, take action, and take away the experience.
- Transmission medium (wired or wireless)
- Network software.
Computer networks connect nodes like computers, routers, and switches using cables, fiber optics, or wireless signals. These connections allow devices in a network to communicate and share information and resources. Networks follow protocols, which define how communications are sent and received.What are the 4 types of networks? ›
- PAN (Personal Area Network)
- LAN (Local Area Network)
- MAN (Metropolitan Area Network)
- WAN (Wide Area Network)
Clients and servers—how services such as e-mail and web pages connect using networks. IP addresses—how devices on a network can be found. Network hubs, switches and cables—the hardware building blocks of any network. Routers and firewalls—how to organize and control the flow of traffic on a network.What are the two main types of computer network? ›
Two basic network types are local-area networks (LANs) and wide-area networks (WANs). LANs connect computers and peripheral devices in a limited physical area, such as a business office, laboratory, or college campus, by means of links (wires, Ethernet cables, fibre optics, Wi-Fi) that transmit data rapidly.
What is LAN vs WAN vs man vs pan? ›
PAN: Personal Area Network. LAN: Local Area Network. MAN: Metropolitan Area Network. WAN: Wide Area Network.What is IP address in networking? ›
An IP address is a unique address that identifies a device on the internet or a local network. IP stands for "Internet Protocol," which is the set of rules governing the format of data sent via the internet or local network.Do you need math for computer networking? ›
A solid math background is valuable, like all the other computer science and engineering fields. In addition to Calculus, important tools in computer networking and communications include the following: Linear algebra. Probability and statistics.How quickly can I learn networking? ›
The Computer Networking certificate program can be completed in 60 weeks. This is a great and quick way for students to get the skills required for entry-level positions. Most students choose the Associate of Science in Computer Networking program which takes approximately two years to complete.How do I prepare for a computer network interview? ›
- Write an Interview Experience.
- Layers of OSI Model.
- TCP/IP Model.
- Basics of Computer Networking.
- Caesar Cipher in Cryptography.
- Network Devices (Hub, Repeater, Bridge, Switch, Router, Gateways and Brouter)
- TCP Server-Client implementation in C.
- RSA Algorithm in Cryptography.
Misner to discuss the 3 Ps of a powerful network: Make relationships Personal. Get beyond what your competitors know about your connections. Keep details Private.What are the 4 critical steps of networking? ›
- The approach.
- The follow-up.
- The request.
- Networking is about contact. It's eye contact, face-to-face contact, phone contact, e-mail contact. ...
- Be the one to initiate. Keep your eyes and ears open to prospects. ...
- Be bold. ...
- Anticipate discomfort. ...
- Expect acceptance. ...
- Pass it on. ...
- Always respond.
Ethernet is the traditional technology for connecting devices in a wired local area network (LAN) or wide area network (WAN). It enables devices to communicate with each other via a protocol, which is a set of rules or common network language.What are 7 pieces of hardware that are used to build a network? ›
Router, Network cards, Cable, Hub, Bridge, Switch, Modem. There are seven main devices that are used to build a network.
What are the top 5 tips for networking? ›
- Be prepared. Fail to plan and you plan to fail. ...
- Set yourself a target. A networking event is not a social gathering – you are there to achieve something. ...
- Don't have a set agenda. ...
- Be a good guest. ...
- Talk and listen. ...
- Give referrals. ...
- Take two business cards. ...
- Time management.
- What are your primary job responsibilities?
- What experience did you have to get your job?
- How long have you worked here?
- What is your own background and experience?
- What is a typical work day like?
- How long is your work day?
- How much variety is there in your work?
- What brings you here?
- What are you most excited about attending this event?
- What made you choose your field?
- Do you like what you do?
- What do you like doing outside of work?
A network has 5 basic components viz. clients, servers, channels, interface devices and operating systems.What are the 3 elements of a computer network? ›
Basic elements of a computer network include hardware, software, and protocols. The interrelationship of these basic elements constitutes the infrastructure of the network.What are the 10 most common interview questions and answers and answers? ›
- What Are Your Weaknesses? ...
- Why Should We Hire You? ...
- Why Do You Want to Work Here? ...
- What Are Your Goals? ...
- Why Did You Leave (or Why Are You Leaving) Your Job? ...
- When Were You Most Satisfied in Your Job? ...
- What Can You Do for Us That Other Candidates Can't?
- The World Wide Web. ...
- The Internet. ...
- Powerline and airline networks. ...
- Citation networks. ...
- Language networks. ...
- Food webs. ...
- Economic networks. ...
- Metabolic and protein networks.
- Tell me about yourself.
- Walk me through your resume.
- How did you hear about this position?
- Why do you want to work at this company?
- Why do you want this job?
- Why should we hire you?
- What can you bring to the company?
- What are your greatest strengths?
- Access Point.
IP stands for "Internet Protocol," which is the set of rules governing the format of data sent via the internet or local network. In essence, IP addresses are the identifier that allows information to be sent between devices on a network: they contain location information and make devices accessible for communication.
What are the two 2 main types of networks? ›
- Local Area Network (LAN)
- Wide Area Network (WAN)
Once you engage in conversation, the best strategy is to employ the six most important words in networking: WHO, WHAT, WHEN, WHERE, WHY and HOW.What are excellent networking skills? ›
Some of the most important networking skills for 2023 include active listening, communication, confidence, positivity, and public speaking. Being aware of your body language, preparing a safety net, and asking open-ended questions are among the most useful tips to improve your networking.