Test 2 Flashcards
7 Layers of OSI Network Model
- Application Layer
- Presentation Layer
- Session Layer
- Transport Layer
- Network Layer
- Data Link Layer
- Physical Layer
Application Layer
End User Layer.
Serves as the window for users and application processes to access the network services.
Presentation Layer
Syntax Layer.
Formats the data to be presented to the Application layer. It can be viewed as the “Translator” for the network.
Session Layer
Synch and Send to Ports.
Allows session establishment between processes running on different stations.
Transport Layer
TCP.
Ensures that messages are delivered error-free, in sequence, and with no losses or duplications.
Network Layer
Packets.
Controls the operations of the subnet, deciding which physical path the data takes.
Data Link Layer
Frames.
Provides error-free transfer of data frames from one node to another over the Physical layer.
Physical Layer
Physical Structure.
Concerned with the transmission and reception of the unstructured raw bit stream over the physical medium.
Ring Network
Old “Token Ring” Network - all of the machines are connected to one another to pass information around in a one-way circle.
Star Network
New, Current “Star” Network - all of the machines are individually connected to one central box that connects to the rest of the network.
CRC
Checksum. Stands for Cyclic Redundancy Check
2 Types of IP Addresses
IPv4 and IPv6
NAT
Network Address Translation.
LAN
Local Area Network
WAN
Wide Area Network
