Download in
Google Play
Networks and the internet
111
Share
Save
Sign up
Sign up to get unlimited access to thousands of study materials. It's free!
Access to all documents
Join milions of students
Improve your grades
By signing up you accept Terms of Service and Privacy Policy
Sign up
Sign up to get unlimited access to thousands of study materials. It's free!
Access to all documents
Join milions of students
Improve your grades
By signing up you accept Terms of Service and Privacy Policy
Sign up
Sign up to get unlimited access to thousands of study materials. It's free!
Access to all documents
Join milions of students
Improve your grades
By signing up you accept Terms of Service and Privacy Policy
Sign up
Sign up to get unlimited access to thousands of study materials. It's free!
Access to all documents
Join milions of students
Improve your grades
By signing up you accept Terms of Service and Privacy Policy
Networks and internet Internet: The internet is a collection of inter-connected networks. Services such as the web, email & file sharing make use of the internet. The world wide web (www) is a service that uses the internet. It is an information system of interlinked web pages & other resources It can be accessed from a web browser. HTTP senas and receives data. wide area networks. (WAN) A wide area network (or WAN) is any network in which the computers communicate using resources supplied by a third party carrier' such as BT. A WAN uses cables, telephone lines, satellites or radio waves to connect remote locations. The internet is the largest WAN in the world. Some organisations may have a number of geographical locations. Each one will have its own network. When these networks are joined together, they will create a WAN. Internet Growth 1969 H four internet networks 1989 ● 100,000 connected networks Mobile devices Parking meters Smart meters 2019 H 4.5 billion internet users. ● • Cars ● kitchen appliances Cat trackers ● Global Internet Users (1995-2020) Internet users (Millions) Percentage of world's population 14% 2005 1966 The internet of things (IOT) In 2020 there were over 31 billion loT items connected to the internet. These items include: 2010 3270 2015 4574 2020 The internet of things connects smart' devices over the internet and allows them to collect & exchange data 7000 6000 4000 1Pv4 addressing Every computer in the world has an IP Cinternet protocol) address. IPv4 addresses are four 8-bit numbers (0-255) separated by dots. E.q. 72.129.214.32 Newer IPv6 addresses are...
Can't find what you're looking for? Explore other subjects.
Knowunity is the # 1 ranked education app in five European countries
Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.
Still not sure? Look at what your fellow peers are saying...
iOS User
I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D
Stefan S, iOS User
The application is very simple and well designed. So far I have found what I was looking for :D
SuSSan, iOS User
Love this App ❤️, I use it basically all the time whenever I'm studying
Alternative transcript:
128-bit numbers represented in hex. Circuit switching network when making a telephone call, a dedicated connection is set up between you the person you are calling for the duration of the call. This is called circuit switching. Circuit switching works for phone calls but there would not be enough lines. for billions of people sending data. Packet switching solves this issue. Packet switching When files are sent over the internet, the files are broken up into data packets of 512 bytes. Each packet is given a header containing: the IP address it is going to the IP address it has come from 图 the sequence number of the packet the number of packets in the whole communication. error checking data. Data packets Each packet will contain the same number of bytes The packets may flow through the Internet via different routes. • Each packet is marked with the packet number so the packets can be put together by the receiver. Reassembling the data The recipient computer re-orders the packets. Each packet is checked for errors. • Corrupt packets are requested to be resent. Moving packets on the net. Points on a network diagram are called nodes. Routers are nodes that can route packets from one place to another. Domain name system (DNS) The DNS is made up of domain names Domain names are names used to refer to an IP address. E.g: google.co.uk is a domain name. A DNS server translates a web address into an IP address. DNS servers There are 13 DNS root servers worldwide which keep a complete database of all domain names & IP addresses. Other DNS servers hold parts of the database. when a DNS server receives a request that is not in its data- base, it will pass the request on to another server until it reaches one with the matching name & IP address. Lower level DNS servers are owned by internet service Providers (ISPs) Changes in IP addresses The ip address of a device you use at home, is the one belonging to your home router. If you take the device on holiday, the device will be assigned a new IP address. Home IP addresses will change when the router reconnects to the internet. This is called dynamic IP address. Network interface cards (NICS) A NIC is built into every networked device. It can be wireless with an antenna or wired with a network cable socket. Most modern devices incorporate the NIC into the motherboard. NIC Mac addressing A media access control (MAC) address is assigned to each NIC by the manufacturer. Computers may have more than one MAC address if it has both. an Ethernet & Wi-Fi connection. A smart phone will have two different MAC addresses: one for Wi-Fi one for bluetooth. Example of a MAC address: 3B: 14:E 6:39:0A 20. There are 28 possible MAC addresses. LD enough for 40,000 for each person. when you request a web page, each router along the way. uses the MAC address of the next router to send the data packet on the next leg of its journey. •The MAC address of a NIC is unique and never changes.
Networks and the internet
111
Share
Save
Comments (12)
Description of the internet, MAC addressing, networking and WAN.
Description of the internet, MAC addressing, networking and WAN.
Similar Content
7
The internet structure
Notes on the internet structure, TCP/IP stack - A level OCR computer science
15
Topologies, Protocols & Layers
GCSE Computer Science
7
Computer science notes -Networks(topic 4)
here are some notes about networks, including: LAN,WAN, cloud, types of cables, hubs, routers, switches, network topologies, network protocols and methods of attack and preventing attack.
16
1.3.1 Networks and Topologies
My notes on networks and topologies, including common network topologies and the internet as a collection of computer networks
0
How data packets get routed - Flashcards
6
1.3.2 Wired and wireless networks
My notes on 1.3.2 networks, inculdes infomation on protocols and networks
Networks and internet Internet: The internet is a collection of inter-connected networks. Services such as the web, email & file sharing make use of the internet. The world wide web (www) is a service that uses the internet. It is an information system of interlinked web pages & other resources It can be accessed from a web browser. HTTP senas and receives data. wide area networks. (WAN) A wide area network (or WAN) is any network in which the computers communicate using resources supplied by a third party carrier' such as BT. A WAN uses cables, telephone lines, satellites or radio waves to connect remote locations. The internet is the largest WAN in the world. Some organisations may have a number of geographical locations. Each one will have its own network. When these networks are joined together, they will create a WAN. Internet Growth 1969 H four internet networks 1989 ● 100,000 connected networks Mobile devices Parking meters Smart meters 2019 H 4.5 billion internet users. ● • Cars ● kitchen appliances Cat trackers ● Global Internet Users (1995-2020) Internet users (Millions) Percentage of world's population 14% 2005 1966 The internet of things (IOT) In 2020 there were over 31 billion loT items connected to the internet. These items include: 2010 3270 2015 4574 2020 The internet of things connects smart' devices over the internet and allows them to collect & exchange data 7000 6000 4000 1Pv4 addressing Every computer in the world has an IP Cinternet protocol) address. IPv4 addresses are four 8-bit numbers (0-255) separated by dots. E.q. 72.129.214.32 Newer IPv6 addresses are...
Networks and internet Internet: The internet is a collection of inter-connected networks. Services such as the web, email & file sharing make use of the internet. The world wide web (www) is a service that uses the internet. It is an information system of interlinked web pages & other resources It can be accessed from a web browser. HTTP senas and receives data. wide area networks. (WAN) A wide area network (or WAN) is any network in which the computers communicate using resources supplied by a third party carrier' such as BT. A WAN uses cables, telephone lines, satellites or radio waves to connect remote locations. The internet is the largest WAN in the world. Some organisations may have a number of geographical locations. Each one will have its own network. When these networks are joined together, they will create a WAN. Internet Growth 1969 H four internet networks 1989 ● 100,000 connected networks Mobile devices Parking meters Smart meters 2019 H 4.5 billion internet users. ● • Cars ● kitchen appliances Cat trackers ● Global Internet Users (1995-2020) Internet users (Millions) Percentage of world's population 14% 2005 1966 The internet of things (IOT) In 2020 there were over 31 billion loT items connected to the internet. These items include: 2010 3270 2015 4574 2020 The internet of things connects smart' devices over the internet and allows them to collect & exchange data 7000 6000 4000 1Pv4 addressing Every computer in the world has an IP Cinternet protocol) address. IPv4 addresses are four 8-bit numbers (0-255) separated by dots. E.q. 72.129.214.32 Newer IPv6 addresses are...
Can't find what you're looking for? Explore other subjects.
Knowunity is the # 1 ranked education app in five European countries
Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.
Still not sure? Look at what your fellow peers are saying...
iOS User
I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D
Stefan S, iOS User
The application is very simple and well designed. So far I have found what I was looking for :D
SuSSan, iOS User
Love this App ❤️, I use it basically all the time whenever I'm studying
Alternative transcript:
128-bit numbers represented in hex. Circuit switching network when making a telephone call, a dedicated connection is set up between you the person you are calling for the duration of the call. This is called circuit switching. Circuit switching works for phone calls but there would not be enough lines. for billions of people sending data. Packet switching solves this issue. Packet switching When files are sent over the internet, the files are broken up into data packets of 512 bytes. Each packet is given a header containing: the IP address it is going to the IP address it has come from 图 the sequence number of the packet the number of packets in the whole communication. error checking data. Data packets Each packet will contain the same number of bytes The packets may flow through the Internet via different routes. • Each packet is marked with the packet number so the packets can be put together by the receiver. Reassembling the data The recipient computer re-orders the packets. Each packet is checked for errors. • Corrupt packets are requested to be resent. Moving packets on the net. Points on a network diagram are called nodes. Routers are nodes that can route packets from one place to another. Domain name system (DNS) The DNS is made up of domain names Domain names are names used to refer to an IP address. E.g: google.co.uk is a domain name. A DNS server translates a web address into an IP address. DNS servers There are 13 DNS root servers worldwide which keep a complete database of all domain names & IP addresses. Other DNS servers hold parts of the database. when a DNS server receives a request that is not in its data- base, it will pass the request on to another server until it reaches one with the matching name & IP address. Lower level DNS servers are owned by internet service Providers (ISPs) Changes in IP addresses The ip address of a device you use at home, is the one belonging to your home router. If you take the device on holiday, the device will be assigned a new IP address. Home IP addresses will change when the router reconnects to the internet. This is called dynamic IP address. Network interface cards (NICS) A NIC is built into every networked device. It can be wireless with an antenna or wired with a network cable socket. Most modern devices incorporate the NIC into the motherboard. NIC Mac addressing A media access control (MAC) address is assigned to each NIC by the manufacturer. Computers may have more than one MAC address if it has both. an Ethernet & Wi-Fi connection. A smart phone will have two different MAC addresses: one for Wi-Fi one for bluetooth. Example of a MAC address: 3B: 14:E 6:39:0A 20. There are 28 possible MAC addresses. LD enough for 40,000 for each person. when you request a web page, each router along the way. uses the MAC address of the next router to send the data packet on the next leg of its journey. •The MAC address of a NIC is unique and never changes.