TCP/IP and Subnet Masking

Video Class 33 Comments on TCP/IP and Subnet Masking 737


  • Level: Intermediate
  • Presenter: Eli the Computer Guy
  • Date Created: November 19, 2010
  • Length of Class: 69 Minutes



Purpose of Class

  • This class teaches students about the components and concepts in a TCP/IP network.


  1. TCP/IP Overview (2:32)
  2. How TCP/IP Works (16:53)
  3. TCP/IP Numbering (43:00)
  4. Subnet Masking (48:17)
  5. Final Thoughts (64:03)

Class Notes

  1. 1. TCP/IP
    1. Is technically a Protcol Suite
    2. IP Routes Traffic
      1. Layer 3 OSI Model Network
      2. Routable Networks (sub networks)
    3. TCP controls transmission between connected systems
      1. Layer 4 OSI Model  Transport
      2. Windowing is the process of sending data from one computer to another in TCP/IP version 4
  2. 2. How TCP/IP Works
    1. IP Addresses – Every device on a TCP/IP network needs an individual IP Address
    2. DNS (Domain Name Service/Server) resolves Domain names into IP Addreses
    3. DHCP (Dynamic Host Control Protcol) Servers automatically assign IP information to clients for a specific time period (Lease).  Clients try to renew leases at 50% expiration point.
    4. Default Gateway (Router) connects networks.  If an IP Address cannot be found on the local network the computer tries to use the Default Gateway to find the target.
    5. Subnets and Subnet Masking – Subnets are individual networks.  Subnet Masks divide IP Addresses in Subnet Number and Host Number
  3. What the Number Mean
    1. IP Addresses and Subnet Masks are made of 4 Octets of Bits
    2. 128-64-32-16-8-4-2-1
  4. Subnet Masking
    1. IP Addresses contain the Subnet Number and Host Number.  The Subnet Mask tells you where the subnet number ends and the host number begins.
    2. Classful Networks A, B, C,D,E  Gone now use CIDR
    3. The Highest Address in a Subnet Range is the Broadcast address
    4. To determine the number of subnets (n is the number of bits used)= 2n
    5. To determine number of Hosts = 2n -2



Eli the Computer Guy

Eli the Computer Guy has 16 years experience in technology being the guy to fix "it". From the Army, to building out new satellite offices for the enterprise, to running his own shop with 9 full time employees Eli has real world experience with almost all systems that technicians will be working with. Eli has 1600 hours of formal technical beyond his Bachelors Degree in Criminal Justice on technologies ranging from Avaya PBX/ Audix to Microsoft, Red Hat Linux, MySQL, Cisco and much more.

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