Unit 1.5 - Network topologies, protocols and layers
No description yet. This curated deck is ready for daily study.
Card preview (24)
Topology
Diagram showing the Layout of connections in a network
Features - Star Topology
Computers connected to a central switch in a LAN
Advantages - Star Topology
Reliable No Data Collisions High Performance Easy to Add/Remove Nodes
Disadvantages - Star Topology
Expensive - Cables Extra Hardware - Switches Server/Switch Fails - connected nodes fail
Features - Mesh Topology
Switches/Routers connected so more than one possible route
Advantages - Mesh Topology
Reliable & Self-Healing High Performance- Data sent same time, No Collisions, High Traffic No Central Node
Disadvantages - Mesh Topology
Expensive & Difficult - Cables Redundant Connections
Uses - Mesh Topology
Cluster of Surveillance Drones Military Communications Smart Devices around the home
Features - Ring Topology
Device connect to two others in ring. Data Travels in one Direction
Advantages - Ring Topology
No Data Collisions
Disadvantages - Ring Topology
Cable/Device fail - Network fail Low Performance
Features - Bus Topology
One Main cable. Terminators - stop signals reflecting back
Advantages - Bus Topology
Easy to install Low Cost - Cable
Disadvantages - Bus Topology
Cable fail - Network fail Data Collisions Low Performance Security Risks - All devices see all data
Wi-Fi
Wireless connection to Network Requires a WAP / Router. Data sent on specific frequency called a channel
Advantages - Wi-Fi
Convenient & Low Cost No Cables - Wander around Add/Remove Devices easily Less Disruption to Building/Walls
Disadvantages - Wi-Fi
Interference & Signal quality Less Secure - Hacking Lower Bandwidth than wired
Wi-Fi - Frequency
2.4 Ghz 5 Ghz
Features - 2.4 Ghz
Long range Slow data transmission (450 Mbps or 600 Mbps) Interference from Cordless phones, baby monitors
Features - 5 Ghz
Short range Fast data transmission (1300 Mbps)
Wi-Fi - Channels
Channels 1 - 11 Used for Radio Wave Communication Interference Cordless phones, baby monitors.
Wi-Fi - Encryption
Data is Scrambled during communication Protect from Hackers, unreadable if intercepted. Recipient needs Key to decode
Wi-Fi - Protocols
Set of rules for how computers communicate (send/receive data) Speed of transmission, size of the message, error checking, transmission
TCP/IP
Transmission Control Protocol/Internet Protocol TCP Provides Error Free Transmission Separates & Reassembles data packets IP routes packet across a WAN giving the packet its destination address.