The IT function is usually structured in a way to align itself with lines of business, which extends the LOB silo into equivalent silos within corporate IT.
Furthermore, IT teams are also aligned around applications, an ensemble of IT components that serves a LOB or a major business process.
Technology and knowledge walls are nurtured by those IT application teams that slowly build little fiefdoms based on the uniqueness of their application and a privileged relationship with the sponsoring business unit.
Learn more about how silos of all sorts hamper business agility: https://rmbastien.com/book-summary-the-new-age-of-corporate-it-volume-1/
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