Topics in ICTIntroduction to routers in networking Wired router and wireless router explained What are core routers in networking? Virtual routers explained with its configuration Edge router explained with its types Domain Name System explained Types of computer network Functions of a router Computer scheme of work, SS1, First Term Computer scheme of work, SS1, Second Term Computer scheme of work, SS1, Third Term Introduction to computer networks Types of DNS server Open Systems Interconnect: Layers of the OSI Model Internet of Things (IoT), How IoT works, its advantages and challenges How to consume less data on android phone Best programming languages to learn The internet and world wide web explained Computer Hardware, Parts and Functions of Computer Hardware
Academic Questions in ICT
DNS belongs to layer _____ of the Open System Interconnect (OSI) model of networking.
Which of the following DNS servers receive queries directly from computers, phones and other client devices?
A. Root Nameserver
B. Top Level Domain (TLD) Nameserver
C. Bottom Level Domain (BLD) Nameserver
D. Authoritative Nameserver
E. Direct Nameserver
F. Recursive DNS Server
The uppermost layer of the Open System Interconnect (OSI) model of networking is the _____ layer.
E. Data Link
Concerning the internet of things, which of the following statement is incorrect?
A. Humans will become connected to the internet through the internet of things
B. It refers to the billions of physical devices that will be connected to the internet
C. Big data is associated with the internet of things
D. Presently, we have more humans living on earth that things connected to the internet
E. China, North America and Europe accounts for over two thirds of internet connected things
F. The ultimate goal of the Internet of things will be made a reality through IPv6
What is the first step towards disabling automatic image download on WhatsApp?
A. Click on the three dots on the top right hand corner
B. Click on the WhatsApp logo
C. Click on the settings icon on the top right corner
D. Click on the settings icon located on the to top-center of the app
E. Click directly on the storage and data icon located on the top right corner
F. Click on the mobile data usage icon located on the top right corner
The followings are ways to conserve data on android phones except _____.
A. Turning on data saving mode
B. Activating background apps
C. Use of Wi-Fi to update apps
D. Disable automatic image download on WhatsApp
E. Watch low resolution videos on youtube
F. Utilizing a reputable data saving app on google playstore
Twitter was launched in _____.
Due to the limitation of the Internet Protocol version 4 address, _____ was created.
A core router is always present within a Local Area Network (LAN). It is crucial towards the proper routing and distribution of packets within the LAN. In fact, it sits as the center of the LAN and is considered as its backbone. This is true because it ensures that all other routers within the LAN efficiently and rapidly receives traffic which it had processed at an amazing speed.
The primary function of a core router is to convey and distribute heavy traffic (or data) without manipulating such data in most instances. In this regard, all traffic in the LAN usually goes through it. Therefore, the core router may also be referred to as a distribution router. Meanwhile, understand that core routers do not move or receive traffic from end devices like personal computers, phones, VoIP devices and so on.
Recall that LANs are usually broken down into smaller networks called subnets or virtual LANs (VLANs). It is the responsibility of the core router to connect and distribute traffic through the subnets in an efficient manner. Simply put, the speed of the entire LAN will depend on the core routers' hardware, alongside their cabling and configurations.
The image below shows three core routers distributing traffic to various access edge routers in a LAN. The core routers are the backbone of a large LAN.
The core routers are usually very powerful and extremely fast in their functions. Without their outstanding functionalities, a large LAN will likely crumble. For this reason, core routers are often the most expensive of all routers.
With regards to the media (or cabling) utilized, a core router may use the fiber optic cable, although high speed copper cabling can also be used.
Regardless the size of the LAN, a core router is an important piece of routing device that can significantly improve the flow of traffic within the LAN. Importantly, understand that core routers are typically deployed in large and massive data driven networks requiring a excellent throughput. They can therefore process millions of packets within a second.
Kindly share this article via the links below:
Click here to read on Len Academy Smart School Software. Contact us for a standard website at an affordable price
Please click here to follow Len Academy on Google News.
Amazing facts in ICT
1,000 computers are used to retrieve the answers to your Google search (query) in 0.2 seconds
The first hand-held mobile phone call was made in New York City on April 3rd, 1973
The logo for gmail was designed the night before it was launched
Coca Cola owns all the domain names (website names) that can be read as ahh. They include: ahh.com, ahhh.com, ahhhh.com, ahhhhh.com, ahhhhhh.com and so on..., all the way up to 62 'h's!
YouTube is a video-sharing platform which commenced operations on February 14, 2005 (Valentine's day). Three former PayPal employees -> Chad Hurley, Steve Chen and Jawed Karim created the YouTube service (as a dating app) until Google bought it in November 2006 for US$1.65 billion
Smoking near an Apple (Mac) computer voids the warranty.
When you add /4 to the end of Facebook's URL, it will take you to Mark Zuckerberg.
You can try it on you own; or better still, try the link below:
Apple iPad retina display is actually manufactured by Samsung
The big five tech companies of the world as at 2018 are :
Notable points in ICT
Python is one of the most popular programming languages, and will still remain relevant for a long time.
Python can be used for almost every kind of project including web application, machine learning, mobile and desktop applications, networking servers, APIs, scrapers, application’s backend and so on.
There is a great availability of third-party libraries for the python language. For this reason, it becomes one one of the easiest languages to learn as a beginner.
Believe it or not, Hypertext Preprocessor (PHP) still remains one of the most popular backend language for web applications, even though it is currently facing a stiff competition from python language.
Content Management Systems (CMS) like wordpress and drupal are written in PHP for its backend. Interestingly, some of facebook’s backend were also written in PHP.
As at 2019, the backend of more than 40% of active websites are powered with PHP. In fact, Len Academy is also powered by PHP for its backend.
If you wish to manipulate databases via Structured Query Language (SQL) with a programming language that has dynamic capabilities, then PHP is your language of choice.
Below are notable dates on internet evolution:
1983: The Domain Name System (DNS) created the '.com .edu .gov .org and .net' systems for naming websites
1985: The first registered domain name - 'symbolics.com' came into existence
1992: The first audio and video were uploaded over the internet
1992: The phrase 'surfing the Internet' became popular
1993: The number of websites reached 600
1993: White House and United Nations go online
1994: Microsoft creates a Web browser for Windows 95
1994: Yahoo! is created by Jerry Yang and David Filo
1995 Amazon and eBay were launched online
1996: 'The Dancing Baby' becomes the first viral internet video
1997: Netflix is founded by Reed Hastings and Marc Randolph
1998: Google search engine came into existence
2003: The worm 'SQL Slammer' spread over the internet within 10 minutes
2004: Facebook goes online
Computer hardware is the collection of physical parts of a computer system.
Physical parts of a computer are those parts that you can see and touch. It may also be referred to as the 'equipment of the computer'.
When the computer case is opened (with a screwdriver), one would see the different hardware components inside of it. It's important to state that some other hardware components are present outside the computer case; and these are termed peripherals.
Below are hardware components seen inside the computer case:
Central Processing Unit (CPU)
Graphics Processing Unit (GPU)
Power supply Unit (PSU)
Peripheral Component Interconnect (PCI) slots
Network Interface Card (NIC)
Random Access Memory (RAM)
Solid State Drive (SSD)
Optical Disc Drives (external present)
USB port, PS2 port, Ethernet port and other ports
Expansion Ports / Slots
Hardware components seen outside the computer case are called peripherals. The peripherals are grouped into the following:
Input devices: They provide information to the computer.
Output devices: Brings out information from the computer.
Storage devices: They store information or data.
Below are examples of some peripherals:
Touch Pad (input)
Universal Serial Bus (USB) flash drive or memory card (storage)
Hard disc drive (storage)