Tryhackme-what is networking
Begin learning the fundamentals of computer networking in this bite-sized and interactive module.
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Watch This Vedio For Solved Task 3 & 4
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Task 1 What is Network ?
Networks are simply things connected. For example, your friendship circle: you are all connected because of similar interests, hobbies, skills and sorts.
Networks can be found in all walks of life:
- A city’s public transportation system
- Infrastructure such as the national power grid for electricity
- Meeting and greeting your neighbours
- Postal systems for sending letters and parcels
Q: What is the key term for devices that are connected together?
Ans: Network
Task 2 What is the Internet?
Now that we’ve learnt what a network is and how one is defined in computing (just devices connected), let’s explore the Internet.
The Internet is one giant network that consists of many, many small networks within itself. Using our example from the previous task, let’s now imagine that Alice made some new friends named Zayn and Toby that she wants to introduce to Bob and Jim. The problem is that Alice is the only person who speaks the same language as Zayn and Toby. So Alice will have to be the messenger!
Q:Who invented the World Wide Web?
Ans: Tim Berners-Lee
Task 3 Identifying Devices on a Network
To communicate and maintain order, devices must be both identifying and identifiable on a network. What use is it if you don’t know whom you’re talking to at the end of the day?
Devices on a network are very similar to humans in the fact that we have two ways of being identified:
- Our Name
- Our Fingerprints
Now we can change our name through deed poll, but we can’t, however, change our fingerprints. Every human has an individual set of fingerprints which means that even if they change their name, there is still an identity behind it. Devices have the same thing: two means of identification, with one being permeable. These are:
- An IP Address
- A Media Access Control (MAC) Address — think of this as being similar to a serial number.
Q: What does the term “IP” stand for?
Ans: Internet Protocol
Q: What is each section of an IP address called?
Ans: Octet
Q: How many sections (in digits) does an IP address have?
Ans: 4
Q: What does the term “MAC” stand for?
Ans: Media Access Control
Q: Deploy the interactive lab using the “View Site” button and spoof your MAC address to access the site. What is the flag?
ِAns: Watch the video above
Task 4 Ping (ICMP)
Ping is one of the most fundamental network tools available to us. Ping uses ICMP (Internet Control Message Protocol) packets to determine the performance of a connection between devices, for example, if the connection exists or is reliable.
The time taken for ICMP packets travelling between devices is measured by ping, such as in the screenshot below. This measuring is done using ICMP’s echo packet and then ICMP’s echo reply from the target device.
Pings can be performed against devices on a network, such as your home network or resources like websites. This tool can be easily used and comes installed on Operating Systems (OSs) such as Linux and Windows. The syntax to do a simple ping is ping IP address or website URL. Let's see this in action in the screenshot below.
Here we are pinging a device that has the private address of 192.168.1.254. Ping informs us that we have sent six ICMP packets, all of which were received with an average time of 4.16 milliseconds.
Q: What protocol does ping use?
Ans: ICMP
Q: What is the syntax to ping 10.10.10.10?
Ans: ping 10.10.10.10
Q: What flag do you get when you ping 8.8.8.8?
Ans: Watch the video above
Task 5 Continue Your Learning: Intro to LAN
Continue your learning by joining the “Intro to LAN” room.
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