Networking & the Internet - created from Mind Map

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Internet

Network Topologies

Connectivity

Encryption

Types of networks

Many computers (including networking equipment) connected together.

Star Networks

Bus Networks

Ring Topology

Mesh Topology

Hybrid

Computers connected to a single computer (typically a switch or a router).

Pros

Cons

Easier to manage all the devices

More cables required to connect to a single computer

Single point of failure (router/switch fails, all connected computers fail.

Computers connected to a single cable

Cons

Pros

Single point of failure

Decreased bandwidth per computer

(if the cable which all computers are connected fails, all fails)

Simple

Computers connected to each other, if one breaks or is shut down, all connections stops.

P2P?

Cons

Pros

All computers become single point of failure of the network

Reliable and efficient

All computers connected to all other computers.

Cons

Pros

Complex

Expensive (single RJ45 cable for amount of other computers)

Reliable

Always redundancy if any of the other computers breaks

Mixture of different topologies

History of connectivity

Bandwidth

Connection Speeds

The First Oceanic Cable

25000 m cable in the Atlantic made in 2858

1tn/mi

Amount of data that can be carried at a time

latest oceanic cable can carry theoretically up to 250 Tbps

Mbps (Mega bits / sec)

Caesar Cipher

Vigenère cipher

Modern Encryptions

Shifting set amounts of the alphabet to "encrypt" and "decrypt"

RSA, AES

Public-private

LAN

WAN

MAN

PAN