Final answer:
The default 'Dead Timer' in computer networking refers to the time duration that a router waits before declaring a neighboring router as 'dead' or 'unreachable'. The 'Dead Timer' is typically set to 3 times the value of the 'Advertisement Timer' in the RIP routing protocol.
Step-by-step explanation:
The default "Dead Timer" in computer networking refers to the time duration that a router waits before declaring a neighboring router as 'dead' or 'unreachable'. This timer is used to detect and handle network failures. In the RIP (Routing Information Protocol) routing protocol, the default 'Dead Timer' is typically set to 3 times the value of the 'Advertisement Timer', which is the time between sending routing updates.
For example, if the 'Advertisement Timer' is set to 30 seconds, then the default 'Dead Timer' would be 90 seconds (30 * 3 = 90). This means that if a router does not receive any routing updates from a neighboring router for 90 seconds, it will consider the neighboring router as 'dead' and no longer reachable.