1.5 Network Topologies,protocols and layers V2 Joshua Guerrero

1.5 Network Topologies,protocols and layers V2 Joshua Guerrero

1. A Star network

   • Each device is connected by an individual cable directly to the server .They tend to be more reliable and so are usually used in schools and offices

2. Ethernet

   • Stable Connection
   • Reduced possibility to be hacked
   • Faster Trafic speed
   • Generally will have good signal

3. WIFI

   • Benifits
     • Cheap set-up costs
     • More vulnerable to hacking
     • The signal quality will reduce through walls or obstructions
     • Can connect multiple devices with no hardware
     • Interface can occur
     • May not able to receive signals
     • Tends to have slow transfer speeds
     • The connection is stable
   • Wireless Frequency
     • Radio waves are used to transmit data packets without the need for wires

4. Encryption

   • Encryption is a method of scrambling data with a key code which makes no sense
     • On an open or public WIFI network anyone can join and sniff out packets of data from other users.
       • Therefore encryption is used .If intercepted the data will have no meaning

5. Portocols

   • IP
     • Internet Protocol
       • This is also known a IP address
   • HTTP = Hyper Text Transfer Protocol
     • HTTP transmits data over the internet in a unsecure format
   • HTTPS = Hyper Text Transfer Protocol Secure
     • HTTPS uses encryption so that any data that is intercepted is meaningless.
   • POP
     • Post office protocol
       • Send and receive emails
   • A set of rules
   • IMAP
     • Used to retrieve emails
   • SMTP
     • Used to send emails

6. Packets

   • A packet is the unit of data that is routed between an origin and a destination on the Internet or any other packet-switched network
     • It is data put in individual packets
       • The packet is sent and read
         • Calculate checksum
           • Once received it checks for missing packets
             • If one is missing then it sends an error message
               • Then it will reassemble and send the other packet .
                 • Then it will receive the data and there will be a confirmation message
     • Packets contain
       • The Network souce
       • The Network Destination
       • Packet number
       • Pay load

7. Network

   • Mesh Network
     • Where some or all workstations are directly connected to the each other.Most are connected to the node and they exchange the data with

8. Layers

   • Network communication components are standardised
     • Different types of hardware and software are able to communicate troubleshooting easier should and error occour it changes are made to one layer it doesnt efffect another olayer