What will be the dead interval on a router interface if the hello interval is manually set to 15 seconds?

In OSPF (Open Shortest Path First), the dead interval is a critical parameter that determines how long a router will wait to receive a hello packet from a neighbor before considering that neighbor as down. The default behavior for OSPF sets the dead interval to four times the hello interval.

When the hello interval is manually set to 15 seconds, the dead interval calculation follows this rule:

Dead Interval = Hello Interval x 4

Dead Interval = 15 seconds x 4

Dead Interval = 60 seconds

This results in a dead interval of 60 seconds for the router interface when the hello interval is adjusted to 15 seconds. Understanding this relationship between the hello interval and the dead interval is essential for proper OSPF network configuration and ensuring effective communication between OSPF routers.