You are a network designer who must fine tune the convergence of an IS-IS network. The failure detection mechanism has been addressed with reliable loss-of-signal at the interface level. Which three o

Prefix prioritization ensures high-priority prefixes such as loopback and infrastructure routes are processed and installed in the FIB before less critical routes during SPF calculation. This reduces the time to restore connectivity for the most important destinations even before full convergence is complete.

BFD provides sub-second failure detection on point-to-point links, but the question explicitly states failure detection has already been addressed with reliable loss-of-signal, making BFD redundant and outside the scope of the remaining tuning.

Speeding up LSP generation by tuning LSP generation timers reduces the delay between a local topology change being detected and the updated LSP being originated and flooded. Faster LSP generation is a direct accelerator of convergence because neighbors cannot begin recalculating until they receive the updated LSP.

Disabling LDP-IGP synchronization would cause traffic black-holing because the IGP would advertise routes via a link before the LDP session is established and labels are exchanged, introducing forwarding failures rather than improving convergence.

Accelerating SPF computation by reducing the initial SPF delay and hold-down interval timers minimizes the time between receiving updated LSPs and computing and installing new best paths into the RIB. SPF computation delay is one of the three primary time components of total IS-IS convergence time.

The IS-IS overload bit is used to prevent a router from being used as a transit node during initialization or maintenance; adjusting its advertisement duration addresses startup behavior but is not one of the core convergence acceleration techniques for steady-state topology changes.