This entity needs to find a victim frame in cases where there are no free frames.  
One mechanism in this component can be implemented with either a Second-Chance Algorithm or an LRU replacement scheme.  This entity needs to find a victim frame in cases where there are no free frames.  It's not a cache, but Belady's Anomaly states that increasing the number of frames can lead to slower performance when implementing it with First In First Out frames.  A translation lookaside buffer can improve the speed at which it translates addresses from page tables, and thrashing occurs when too much of it is allocated and a system spends all of its time retrieving pages.  Its ability to provide programs with an address space creates an extra layer of security in operating systems, and provides an abstraction for non-contiguous memory regions.  FTP, identify this representation of computer memory that often involves using the hard drive.
One mechanism in this component can be implemented with either a Second-Chance Algorithm or an LRU replacement scheme.  
Virtual Memory