Glossary

Type field
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
< Back to glossary

Type field

The type field forms part of the IPv4 (IP version 4) header, and is used to indicate the transport PDU (Protocol Data Unit) that forms the payload of the datagram. This information is used to pass the PDU through the correct SAP (Service Access Point) to the higher layer transport protocol. The values of the type field that indicate the higher layer protocol were listed until 1994 in RFC (Request for Comments) 1700, this has now been superseded by an online database supported by the IANA. Typical examples include 6 for TCP (Transmission Control Protocol) and 17 for UDP (User Datagram Protocol).

Enhance your knowledge further with our OnlineAnytime Training.

We have package options designed for individuals, teams and organisations. Our packages include:

5G courses...new content and courses continually being added
Access to NetX...supporting in understanding network complexities
ITP Certified courses also providing CPD learning credits
Access via Tablet, Desktop and Smartphone...maximising learning opportunities
View our package options

Need more information? Want to know more about what we do?
Contact Us or Call +44 (0) 1524 844669

Working together with