| Term | Definition |
| Application | Name Of Layer 7 |
| Presentation | Name Of Layer 6 |
| Session | Name Of Layer 5 |
| Transport | Name Of Layer 4 |
| Network | Name Of Layer 3 |
| Data Link | Name Of Layer 2 |
| Physical | Name Of Layer 1 |
| Segments | Transport Layer |
| Packets | Network Layer |
| Frames | Data Link Layer |
| Bits | Physical Layer |
| Hubs | Physical Layer |
| Network Switching | Data Link Layer |
| TCP/UDP | Transport Layer |
| Routing | Network Layer |
| IP Addressing | Network Layer |
| Mac Addressing | Data Link Layer |
| Ethernet | Data Link Layer |
| NIC (Network Interface Card) | Data Link Layer |
| Repeaters | Physical Layer |
| Electrical Signaling | Physical Layer |
| Twister Pair Cable | Physical Layer |
| Radio Waves | Physical Layer |
| HTTP | Application Layer |
| SMTP | Application Layer |
| FTP | Application Layer |
| Client Software | Application Layer |
| Telnet | Application Layer |
| Flow Control | Transport Layer |
| Error Handling | Transport Layer |
| WAN Connectivity | Data Link Layer |
| Port Numbers | Transport Layer |
| Firewall Filtering | Transport Layer |
| Device power off | Layer 1 Troubleshooting |
| Device power unplugged | Layer 1 Troubleshooting |
| Loose network cable connection | Layer 1 Troubleshooting |
| Incorrect cable type | Layer 1 Troubleshooting |
| Faulty network cable | Layer 1 Troubleshooting |
| Incorrect device drivers | Layer 2 Troubleshooting |
| Improperly configured switch | Layer 2 Troubleshooting |
| IP address within the assigned network | Layer 3 Troubleshooting |
| Correct subnet mask | Layer 3 Troubleshooting |
| Correct default gateway | Layer 3 Troubleshooting |
| Correct default gateway | Layer 3 Troubleshooting |
| Firewall configured correctly | Layer 4 Troubleshooting |
| configured with correct sending and receiving email server information | Layer 5 through 7 Troubleshooting |