Week 1: Subnet Refresher
Week 1: 8/29/22
Last updated
Week 1: 8/29/22
Last updated
Dartmouth had hundreds of subnets just in the datacenter
2^32 IPv4 addresses | 32 bits
Look up recipient address
Phone Book? Other Directory?
Get zip code and street address
Put in addressed envelope
Write recipient and return address on envelope
Put letter in mailbox
Mail carrier picks letter up
Take letter to local post office
Post Office sorts and sends to next PO facility
Uses zip code
How does PO know where to send next?
Postal Service has “routing lists”
Ends up at local PO recipient
Mail Carrier delivers to recipient
Uses street address
Look up recipient address
Domain Name System (DNS)
Convert Hostname to IP address
Add “Headers” to data (encapsulate)
Send packet to network interface controller (NIC)
Transmits onto network
Sent to local router (AKA default gateway)
Router sends packet to next router
Uses network part of the IP Address
How does the router know where to send next?
“Routing table” of IP networks
Ends up at local router of recipient
Router and switches send to recipient
Uses Host part and IP address and Mac address`
^Mailbox ^ Mail server -> translates to ip address
TODO:
Download Packet Tracer 8.1.1