| Packet | Header |
| Payload | Protocol |
| Routing | Checksum |
| Fragmentation | TTL (Time To Live) |
| A section of data that precedes the actual payload and contains control information. | A formatted unit of data carried by a packet-switched network. |
| A set of rules that governs the format of data sent over a network. | The actual data being transported by a packet, excluding header and trailer information. |
| A value used to verify the integrity of data during transmission. | The process of selecting paths in a network along which to send network traffic. |
| A field that determines the lifetime of data in a network, preventing it from circulating indefinitely. | The process of breaking down a large packet into smaller ones to fit the maximum transmission unit of a network. |
| Version | Header Length |
| Type Of Service | Total Length |
| Identification | Flags |
| Fragment Offset | Time To Live |
| Specifies the length of the header in 32-bit words. | Indicates the version of the Internet Protocol being used. |
| Indicates the entire packet size, including both header and data, in bytes. | Provides an indication of the abstract parameters of the quality of service desired. |
| Used to control or identify fragments of the packet. | A unique value used to identify the packet, primarily for reassembly purposes. |
| Specifies the maximum time the packet is allowed to remain in the network. | Indicates the position of the fragment in the original packet. |
| Header Checksum | Source Address |
| Destination Address | |
| Specifies the IP address of the sender of the packet. | Used for error-checking the header to ensure data integrity. |
| Specifies the IP address of the intended recipient of the packet. | |