Monday, May 15, 2017

Submarine Internet Cables

  1. The cables use fiber optic technology using lasers to send light down the length of the cable
  2. They are about as thick as a garden hose
  3. They lay on the bottom of the sea floor and only go underground in shallow areas near the coast
  4. Potential capacity is the capacity if the owners of the cables install all available technology, lit capacity is the actual amount running through the cable
  5. Using multiple cables so that if one fails the entire network doesn't go down
  6. Anchors dragging on the sea floor, fishing boats, etc 

Thursday, May 11, 2017

IP addresses and DNS

  1. A protocol is a set of rules that can be used by all machines that connect to the internet
  2. Country of the network/ region of the network/ subnetwork/ device
  3. IPv4 uses 32 bits and has 4 billion different combinations, IPv6 uses 128 bits and has 340 undecillion different combinations, increasing the size of the forever growing internet
  4. An IP packet is a message your computer sends to another IP address, an IP address is the address of your computer
  5. The DNS is used to match IP addresses with their domain name fr a website