OSPF is a link-state routing protocol.

It's worth 1000000000$

Distance vector protocols compute their routing tables before sending routing updates; link-state protocols do not.

The pure state of a quantum system is usually denoted by the vector ket with the unit length.

An interrupt vector is the memory address of an interrupt handler, or an index into an array called an interrupt vector table or dispatch table. Interrupt vector tables contain the memory addresses of interrupt handlers. When an interrupt is generated, the processor saves its execution state via a context switch, and begins execution of the interrupt handler at the interrupt vector.