8-25-2014 Notes

8-25-2014 Notes

.Bandwidth - Amount of data that can be transmitted within a fixed time period. Measured in bits per second (Bps, Kbps, Mbps, Gbps)
.Latency - Amount of time it takes data to travel from source to destination. Measured in milliseconds (MS)
.Data is transmitted through simplex (one way), half duplex (one way at a time), duplex (both directions)
.Octet - Numbers in IP separated by decimal. Can range from 0 to 255

**IP Classes (Public)**
.Class A - Large networks (1.0.0.0 to 126.255.255.255)
.Class B - Medium networks (128.0.0.0 to 191.255.255.255)
.Class C - Small networks (192.0.0.0 to 223.255.255.255)
.Class D - Special use for multicasting (224.0.0.0 to 239.255.255.255)
.Class E - Expiremental testing (240.0.0.0 to 254.255.255.255)

**Private IP Classes**
.Class A - 10.0.0.0 to 10.255.255.255
.Class B - 172.16.0.0 to 172.31.255.255
.Class C - 192.168.0.0 to 192.168.255.255


 Networks (Maximum)		| Hosts (Maximum)
.Class A - 126			| 16,777,214
.Class B - 16234		| 65,534
.Class C - 2,097,152		| 256

*Example: Class C is for homes. All cass C is connected to FiOS, so the network count is high. The hosts (Users within house) are going to be lower. That's why it's like that

.Subnet Mask - Shows user what portion is network and which is user

**Subnet Mask Classes**
.Class A - 255.0.0.0
.Class B - 255.255.0.0
.Class C - 255.255.255.0

.Loopback address - Specialized IP address for NIC. Always 127.0.0.1
.Broadcast - 255.255.255.255. For things like Amber Alerts
.DHCP - Dynamic Host Configuration Protocol. Auto assigns IP, subnet mask, default gateway, DNS
.Default Gateway - Lets you go out into the internet. Without default gateway, you can't go online. Router address
.APIPA - 169.254.x.x Automatic IP Addressing. Auto configures by DHCP when DHCP server isn't available. When there is APIPA, you have no internet