7.04 How the Internet Works

Ping sends a packet to an ip address then records the time for the packet to travel. If the echo does not return then it can tell if the host is inactive. The traceroute command traces the root of a packet through the internet recording each hop and the time for each hop.

Packet Switching consists of a header and a payload. The header contains routing information for the payload. Benefits are network efficiency, reliability, and cost

" TCP/IP (Transmission Control Protocol/Internet Protocol) is the basic communication language or protocol of the Internet. It can also be used as a communications protocol in a private network "

Packet sniffers check out the network. The packet sniffer can be used for good and bad purposes. They can be used by hackers to spy on network traffic and steal a password. They can be used at a common wifi point this is why it is important to protect your data.

ipv4 is 32 bit written in decimal ipv6 is 128 bit written in hexadecimal. We are shifting to IPv6 so we can have more host addresses for the internet.

The domain name is the alphanumeric interpretation of an associated IP address. the domain name represents one or more ip addresses.