What do cluster environments use to identify node failures?
A.
SNMP community strings
B.
heartbeats
C.
OSPF link state advertisements
D.
network interface driver diagnostics
Explanation:
What Happens when a Node Times Out
Each node sends a heartbeat message to the cluster coordinator every HEARTBEAT_INTERVAL number of
microseconds (as specified in the cluster configuration file). The cluster coordinator looks for this message from
each node, and if it does not receive it within NODE_TIMEOUT microseconds, the cluster is reformed minus
the node no longer sending heartbeat messages.
On a node that is not the cluster coordinator, and on which a node timeout occurs (that is, no heartbeat
message has arrived within NODE_TIMEOUT seconds), the following sequence of events occurs:
The node tries to reform the cluster.
If the node cannot get a quorum (if it cannot get the cluster lock) then
The node halts (system reset).
http://docstore.mik.ua/manuals/hp-ux/en/B3936-90122/ch03s07.html
snmp simple network management protocol can send a node failer throw email to alert you
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failure node can be send from the server to your email to alert you …correction
the answer is SNMP
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A SNMP community strings – are for authentication, not for “node failure”.
‘Security has been the biggest weakness of SNMP since the beginning. Authentication in SNMP Versions 1 and 2 amounts to nothing more than a password (community string) sent in clear text between a manager and agent.[1]’
https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol
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Heartbeats is correct. They ask about identify not communicate.
SNMP is a communication protocol. It will notify you about the failure, not detect it.
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clusters uses heartbeats to identify (detect) a node failure on the cluster environment, and then take a further action like failover (if applies).
SNMP may be used to notify the failure to a system administrator or to a monitoring tool in order to a person (or system) to get noticed about the failure, but this is outside of cluster needs (I mean, cluster don’t need snmp to work, but it does certainly needs heartbeats to work as a cluster). Anyway, SNMP community strings is just an snmp authentication method, but not the notify message being sent.
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