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Multi-Service Networks (Lecture 2) - Coggle Diagram
Multi-Service Networks (Lecture 2)
What is Internet?
Network Edge
end systems
access networks
links
Network Core
physical layer
network structure
circuit switching
packet switching
protocol layers
service models
Interconnected computing devices via a transmission medium
Hosts or Terminal Equipment (TEs) = End Systems
Running network applications
By physical communication links
links have a defined capacity - bandwidth (transmission rate - bps)
Cables
fibre
Optical fibre used to transmit as light pulses
coaxial cable
Transmits HF signals. A round copper conductor and 3 layers of insulation + shielding from electromagnetic interference (crosstalk, electrical machinery, lighting)
copper twisted pair
uses: Phone and modern Ethernet
Internet is worldwide collection of interconnected networks (i.e., networks of networks). Use certain communications protocols or rules which allow them to connect with one another.
Network Types
Local Area Network (LAN)
Switches
Intranet Expansion (LAN)
Connect devices in a network
A local area network (LAN) is a collection of devices connected together in one physical location, such as a building, office, or home.
Wide area network (WAN)
Routers
Internet Expansion (WAN)
Connect multiple switches (LAN) networks
routers: forward packets (chunks of data)
wide area network (WAN) or metropolitan area network (MAN) covers larger geographic areas.
Open to access/Subject to cyber attacks
The size of the WAN is larger than LAN and MAN.
Other examples of WAN are mobile broadband connections such as 3G, 4G etc.
Internet is an example of WAN.
Distributed System
One of the main advantage of WAN is the that we do not need to maintain the backup and store data on local system as everything is stored online on a data centre, from where we can access the data through WAN.
Private Area Network (PAN)
It is an interconnection of personal technology devices to communicate over distances less than 33 feet or 10 meters or within the range of an individual person, typically using some form of wireless technologies.
transmission of data between devices such as smartphones, personal computers, tablet computers, etc.
or to server as the network that allows further up link to the Internet.
Metropolitan Area Network (MAN)
Interconnected LANs within a metropolitan/city/town area.
larger than LANs and smaller than WANs
In Metropolitan area network various Local area networks are connected with each other through telephone lines.
connecting LANs to a larger network of computers
Network Protocol
Standardisation
Defined world wide, Standardised set of rules that dictate how data should be formatted, transmitted and received between computer devices on a network, to allow for communication between them
Request For Comments (RFCs)
RFCs started out as general request for comments to resolve architecture problems that faced the precursor to the Internet.
Understanding all intricacies of the IEEE and IETF standards documents called to be able to implement standards
DHCP (Dynamic Host Configuration Protocol) - Automatically assign internet addresses to devices on a network
POP3 (Post Office protocol Version 3), protocol used by email clients to retrieve messages from remote servers
DNS (Domain Name System) translates network IP address to domain names
FTP (File Transfer Protocol): A protocol that is used to transfer and manipulate files on the Internet
IMAP (Internet Message Access Protocol) - A protocol for e-mail messages on the Internet
IRC - Internet Relay Chat - a protocol used for Internet chat and other communications
SMTP (Simple Mail Transfer Protocol): A protocol for e-mail messages on the Internet
HTTP (HyperText Transfer Protocol) sending receiving web pages
