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LINK LOCAL ADDRESS

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 LINK LOCAL ADDRESS   always starts w/ " fe80 " followed by 3 clusters of 4 zeros Ex. = fe80:0000:0000:0000 [last half is auto generated] . GLOBAL UNICAST ADDRESS   aka IPv6   is   automatically generated by your PC + ROUTER Use COMMAND SCREEN: " >ipconfig " to see your IPv6 address SUBNET MASK does not really apply to IPv6 IPv6 uses a prefix length stuck at "/64" in place of SUBNET MASK . . . . . . PORT NUMBERS * Web browser is a web client . They use WEB SERVERS   (like "apache" or "i.i.s.") DNS = Domain name system: like a speed-dialer that zips you to a site's WEB SERVER After IP address & DNS - a PORT NUMBER gets you to the right application . PORT# example: 0-65535  . *when browsing internet there are 2 port #s*  The "SOURCE" port  + "DESTINATION" PORT numbers (like a train) Webpage DATA < PORT 1 (source) < PORT 2 # (destination) < outgoing IP < intercepting IP . Like ...
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DYNAMIC IP ADDRESS

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DHCP = DYNAMIC HOST CONFIGURATION PROTOCOL DHCP is a type of server that automatically gives you a new IP ADDRESS  each time. No longer static IP. VPN disguises all IP ADDRESSES! . . . . . OPEN NETWORK & SHARING - CHANGE ADAPTOR SETTINGS  - PROPERTIES - INTERNET PROTOCOL TCP/IPv? You can toggle between DHCP "obtain IP automatically" or manually enter one. COMMAND SCREEN will reveal even more (like DHCP server address):   >ipconfig /all . . . . . If DHCP server goes down?   your PC has "APIPA" to fallback on to assign new IP addy.   **But this is only for office intranet** . . . OPEN NETWORK & SHARING - CHANGE ADAPTOR SETTINGS  - PROPERTIES - INTERNET PROTOCOL TCP/IPv? - then go to "alternate configuration" tab . to toggle . . . . Apipa ALWAYS gives out addresses like this: 169.254.?.? *CLASS B address . . . . Sometimes you can't get on internet & **it's because your settings are stuck on APIPA** COMMAND SCREEN will reveal if y...
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N.A.T.

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IPv4 ADDRESSes built the internet. But they ran out of combos in late 90s   NAT "network address translation" fixed this You used to have to be manually assigned a network ID via your internet provider Downside of this was your network ID was public to hackers = therefore FIREWALL was born . If someone got past your " Firewall "  all of the PCs on your WAN & LAN were vulnerable **NAT fixed this too** NAT router/gateway will now give private IP addresses to all PCs on a LAN . Your private IP ADDRESS goes through NAT gateway  & the gateway camouflages your address as its own LAN address (Kinda slows things down unfortunately) . .
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OLD ASS EARLY INTERNET

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  Class C   IP ADDRESS =   210.11.12. ? your first 3 clusters of IP ADDRESS are set in stone. 4th cluster is unique Class B  IP ADDRESS  =  210.11. ? . ? First 2 clusters of IP ADDRESS set in stone. 3rd & 4th cluster unique Class A   IP ADDRESS  =  210. ? . ? . ? First cluster of IP ADDRESS set in stone. 2nd, 3rd, & 4th cluster unique Class C  IP ADDRESS =  only 254 hosts Class B  IP ADDRESS =  65,534 hosts Class A  IP ADDRESS =  Millions of hosts . . . . . Class A IP ADDRESS =   126. ? . ? . ? in class A the first cluster could only start with a 1 or 126! Class B IP ADDRESS =   128.11. ? . ? First cluster could be anywhere between 128-191 Class C IP ADDRESS =  223.11.12. ? First cluster could be only be between 192-223 . . . . . **SPECIAL IP ADDRESSES** Class D-"multicast" IP ADDRESS = 224. ? . ? . ? First cluster could only start w/224 (these were for live presentations) spooky Cla...
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L.A.N. LOCAL AREA NETWORKING

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  LOGICAL ADDRESS aka "IP ADRESS" looks like 192.168.5.10 . . . . TIER 1 early internet Internet began via telephones at military base LANs during Cold War . . . . . . . TCP/IPs  TCP/IPs go from 0 to 254                                       ... = never beyond 254 and always w/3 dots mixed in (192.168.5.10) **IP addy never ends with a lone ZERO or 255** . . . . . . . IP ADDRESS: 192.168.5.10 IP ADDRESS the 4 cluster "octet" numbering system  was invented by ARPA to identify each military LAN . . . . . . . IP ADDRESS:  192.168.5.10 . Your 4 cluster "octet" : A) Identifies what LAN you're part of B) shows your unique host ID . . Class C IP ADDRESS =   210.11.12. ? your first 3 clusters of IP ADDRESS are set in stone. 4th cluster is unique Class B IP ADDRESS =  210.11. ? . ? First 2 clusters of IP ADDRESS set in stone. 3rd & 4th cluster unique Class ...
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