To all bloggers, I'm back for our third meeting.. I hope you understand our lesson and I hope also you enjoy our lesson and discussion...

Virtual Private Network is a private network that is constructed within a public network infrastructure such as the global internet. Using VPN, a telecommuter can access the network of the company headquarters through the Internet bu building a secure tunnel.

                       There are 7 OSI Model: 

 

1. Application - deal with applications
2. Presentation - responsible for presenting the data. Example: code formatting, encryption, and compression.
3. Session - establishes, manages, and terminates sessions between two(2) communicating hosts.                                     

                                       3 different modes of session:

1. Simplex
2. Half Duplex 
3. Full Duplex

   4. Transport - layer breaks up the data from the sending host and then              reassembles it in the receiver.
   5. Network - sometimes referred to as the "Cisco Layer"
   6. Data Link - performs physical addressing.
   7. Physical - media through with the data, represented as electronics signals.

OSI model will be used throughout your entire networking career.
                                    Types of Transmission:
                     1. Unicast
                     2. Multicast
                     3. Broadcast


 

 
Broadcast Domain
           - a group of devices receiving broadcast frames initiating from any device within the group.
Collision
           - effects of two nodes  sending transmissions simultaneously in Ethernet.

                                             There are 3 Physical Layer:

1. Media type
2. Connector type
3. Signalling type

                 And thats our last meeting discussion...God Bless and Enjoy...