Short for Authentication Header, an IPsec protocol that verifies the sender and integrity of an entire IP packet but leaves it unencrypted. Network security group rules can filter on it, as they can on TCP, UDP, ICMP and ESP.
Also called Authentication Header.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains AH in context, with comparison tables and the common traps.
Terms in this definition
- IPsec
Internet Protocol Security is the set of protocols that negotiates and encrypts the tunnels used by VNet-to-VNet and site-to-site VPNs.
- Integrity
One leg of the CIA triad: information remains correct and is only changed through approved means. Hashes, digital signatures and audit trails help guard it.
- Network security group
A collection of allow and deny rules that filter traffic in and out of subnets or network interfaces. If an AKS LoadBalancer Service is unreachable, the rules on the node subnet are worth checking.
- FILTER
Returns just those rows of a table that meet a condition. In CALCULATE it handles conditions too complex for a Boolean filter argument, though a Boolean filter is faster whenever one will work.
- TCP
A transport protocol that is connection-oriented.
- UDP
A transport protocol that sends data without establishing a connection.
- ICMP
The protocol behind ping, distinct from both UDP and TCP. Between peered VNets, the default
AllowVnetInBoundNSG rule permits it. - Enrollment Status Page
A progress screen in OOBE and Windows Autopilot that follows network profiles, certificates, policies and apps as they install, first for the device and then for the user. It can stop the person using the device until certain apps have finished.