| 
Router Commands
Are you having trouble remembering the correct order of data encapsulation?
Well, this might help:
| 1. |
Data |
Democrats |
Dumb |
| 2. |
Segments |
Suck |
Stupid |
| 3. |
Packets |
Pickles |
People |
| 4. |
Frames |
For |
For |
| 5. |
Bits |
Breakfast |
Bush |
Maybe you are having trouble
remembering the OSI layers? In that case:
7. |
Application |
All |
| 6. |
Presentation |
People |
| 5. |
Session |
Seem |
| 4. |
Transport |
To |
| 3. |
Network |
Need |
| 2. |
Data Link |
Data |
| 1. |
Physical |
Processing |
Speaking
of OSI Layers, here is a list of what each layer is responsible
for:
| 7. |
Application |
Network Process
to Applications
- Provides network services to application
process, such as e-mail, file transfer, and terminal emulation.
|
| 6. |
Presentation |
Data Representation
- Ensure data is readable by receiving
system
- Formation of data
- Data structures
- Negotiates data transfer syntax
for application layer
|
| 5. |
Session |
Inherhost Communication
- Establishes, manages, and terminates
sessions between applications
|
| 4. |
Transport |
End-to-end Connections
- Concerned with transportation issues
between hosts
- Data transport reliability
- Establish, maintain, terminate virtual
circuits
- Fault detection and recovery information
flow control
|
| 3. |
Network |
Network Address and Best Path
Determination
- Provides reliable transfer and data
across media
- Connectivity and path selection
between host systems
- Logical addressing
- Best effort delivery
|
| 2. |
Data Link |
Direct Link Control, Access
to Media
- Provides reliable transfer of data
across media
- Connectivity and path selection
between host systems
|
| 1. |
Physical |
Binary Transmission
- Wires, connectors, voltages, data
rates
|
Physical Topologies
When to use
a straight through cable. |
| Switch to Router |
| Switch to PC/Server |
| Hub to PC/Server |
|
| When to use a crossover cable. |
| Switch to Switch |
| Switch to Hub |
| Hub to Hub |
| Router to Router |
| PC to PC |
| Router to PC |
|
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