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Network Topologies V2
- Mesh Network
- A network where some or all of the workstations
or devices are connected directly to each other
- Most devices are usually connected to the 'node'
(device) that they exchange the most data with
- If one device fails, not all data is lost
- A network where some or all of the workstations
or devices are connected directly to each other
- Star Network
- A network where each device is individually
connected via a single cable to the server
- More commonly used in schools and offices
- Very reliable; harder to hack
- However, great amount of pressure is
put on the Central Device
- More expensive to set up
- A network where each device is individually
connected via a single cable to the server
- Wi-Fi (Wireless Frequency)
- Radiowaves which are
used to transmit packets
- No need for wires and cables
- Slower than Ethernet; more
vulnerable to attack by hackers
- Can be set up in remote locations
e.g. Building, Planes etc.
- Radiowaves which are
used to transmit packets
- Encryption
- A method of scrambling data
with a key code that doesn't
make sense on its own
- Can only be 'decrypted' (unscrambled)
with a encryption key (same key used to
'encrypt' the device in the first place)
- Encryption method used is called SSL (Secure
Socket Layer); Used on websites e.g. Twitter
- Makes it harder for hackers to
hack encrypted data
- A method of scrambling data
with a key code that doesn't
make sense on its own
- Computer Network
- A number of computers linked together
to share resources with each other; Can
share Hardware, Software, Data
- Printers, Tablets, Laptops and Webcams
can also be connected devices that work
in a computer network
- A number of computers linked together
to share resources with each other; Can
share Hardware, Software, Data
- IP Address
- A unique set of numbers separated by full stops
- Identifies each computer or device using the Internet
Protocol to communicate and interact with a network
- Similar to a postcode to
identify a house in a area
- Sent with the packets to identify which
computers are being sent data and
where the data was sent from
- Is broken down into 4 numbers which
can represent a number between 0 and
255 separated with a full stop
- IP Classes
- IP Addresses have different
classes which identify the class
of network which the user is on
- Indicates the number of total possible
users and purpose of the network
- IP Addresses have different
classes which identify the class
of network which the user is on
- Static IP - Never changes Dynamic
IP - Periodically changes
- A unique set of numbers separated by full stops
- MAC Address (Media
Access Control Address)
- Uniquely identifies a device on a network by
identifying the network adapter that it is using
- Allows you to distinguish between different devices
- Unique code built into the NIC (Network Interface Card)
- Embedded onto the device when made
and cannot be changed by the user
- Written individually and made up of 48 bits, normally in hexadecimal
- Uniquely identifies a device on a network by
identifying the network adapter that it is using
- Protocols
- A set of rules or conventions
which control the communication
between devices on a network
- Key Protocols
- TCP/IP (Transmission Control Protocol/ Internet Protocol)
- Used to transmit data between different networks
- Used to transmit data between different networks
- HTTP (Hyper Text Transfer Protocol)
- HTTPS (Hyper Text Transfer Protocol Secure)
- Used when transferring files around the World Wide Web
(websites etc.) HTTPS encrypts data, making it more secure
- Used when transferring files around the World Wide Web
(websites etc.) HTTPS encrypts data, making it more secure
- FTP (File Transfer Protocol)
- Transfer files between computers on a network
- Transfer files between computers on a network
- POP (Post Office Protocol)
- POP3 (Post Office Protocol v3)
- Retrieves mail; doesn't send email
- Retrieves mail; doesn't send email
- POP3 (Post Office Protocol v3)
- IMAP ( Internet Message Access Protocol)
- Retrieves and stores email messages on a mail server and
allows you to manipulate them as if they were your own
- Retrieves and stores email messages on a mail server and
allows you to manipulate them as if they were your own
- SMTP (Simple Mail Transfer Protocol)
- Transmits email over the Internet on mail servers (e.g. Yahoo, Gmail)
- Transmits email over the Internet on mail servers (e.g. Yahoo, Gmail)
- TCP/IP (Transmission Control Protocol/ Internet Protocol)
- A set of rules or conventions
which control the communication
between devices on a network
- Packet Switching
- Breaking down data into packets which are sent
through the router and then reassembling it
- Contains IP Address of sender and reciever
- Contains Sequence Number (Order of Packets)
- Contains time for when it's alive
- If not all packets are recieved, an error
message is sent and the packets are resent, if
that still does't work, then packets are deleted
- Packets are reassembled in the right order
once all packets have been recieved
- Contains Payload (actual data it's carrying)
- Contains Error Detection Codes
- Confirmation message is sent once all packets
have recieved and placed in the right order
- Breaking down data into packets which are sent
through the router and then reassembling it
- Layers
- Where packets travel through
while data is being recieved
- Protocols manage the data which have
gone through the layers, adding or
removing data if necessary
- If one layer fails/ not all layers are affected
- Where packets travel through
while data is being recieved
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