Final answer:
The HSRP hold time is the interval between the hello messages from the active roster, with a range of 1 to 255 seconds and a default value of 10 seconds.
Step-by-step explanation:
The Hot Standby Router Protocol (HSRP) is designed to allow for transparent failover at the routing level. The HSRP hold time is the interval between the hello messages that the active router sends to indicate it is still functioning properly. The range of the HSRP hold time is from 1 to 255 seconds.
The default HSRP hold time is typically set to 10 seconds. This default value ensures that the standby router can quickly take over in case the active router fails, without causing unnecessary failovers due to short, temporary disruptions.