ICND1, 1st Day

OSI Model-> 7 Layer
Concentrated On First 4 Layer.

T->UDP/TCP
N->Packet(IP): Routers
D->Frame(MAC): Switches
P->Binary: Cables, Hubs

Cisco Icon-> Hub, Switch, Router
Collision Domain, Broadcast Domain
Hub-> 1CD, 1BD
Switch-> *CD, 1BD
Router-> *CD, *BD

IP -> 5 Classes, Prefix, Network ID, Broadcast ID, Valid IP?
IP Address->NetworkHost
Subnet Mask shows Networks and Hide Hosts

Subnetting based on Networks/Hosts
1. Find Bits
2. Borrow Bits
3. Find New Subnet Mask
4. Find Range

Valid IP address?
1. On the same network
2. Must be valid IP (Excluded NetworkID & BroadcastID)

References:
1. http://www.subnetmask.info/

*Troubleshoot from bottom layer.