000-221 · Question #87
An administrator uses the 'no1 command to change the tcp_sendspace network tunable to 262144. A few minutes later, the ifconfig command produces the following output: What additional action is needed?
The correct answer is C. Change the tcp_sendspace interface specific network option for the device. The global tcp_sendspace tunable changed by 'no' does not override per-interface settings; the interface-specific attribute must be updated separately.
Question
Options
- AUse ifconfig to cycle the interface down and up.
- BRun the no command again, specifying a permanent change.
- CChange the tcp_sendspace interface specific network option for the device.
- DRefresh inetd subsystem.
How the community answered
(26 responses)- A4% (1)
- B4% (1)
- C77% (20)
- D15% (4)
Why each option
The global tcp_sendspace tunable changed by 'no' does not override per-interface settings; the interface-specific attribute must be updated separately.
Cycling the interface down and up with ifconfig only reinitializes the interface using its currently stored parameters and does not alter the tcp_sendspace attribute value.
Running 'no' again with the permanent (-p) flag would persist the global tunable across reboots but still would not override the interface-specific sendspace attribute visible in the ifconfig output.
In AIX, each network interface stores its own tcp_sendspace attribute that takes precedence over the global value set by the 'no' command. The ifconfig output in this scenario reveals the interface-specific sendspace is still at the old value, so the administrator must update that per-device attribute using chdev or ifconfig with the appropriate attribute flag to align the interface with the new global setting.
Refreshing the inetd subsystem restarts inetd-managed network services and has no relationship to network interface tunables or the tcp_sendspace attribute.
Concept tested: AIX interface-specific tunable override after no command
Source: https://www.ibm.com/docs/en/aix/7.3?topic=n-no-command
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