Hands down it will be packet input/output handler in the cisco IOS running on routers. Most of the network devices in Internet Backbone, Internet Exchange, Tier-1 networks, Tier-2 networks are cisco devices. So when any packet is generated/sent across the internet(google search, FB page, slashdot page, news, torrents, photo uploads, whatsapp messages, TOR, Deep Web) the same packet handler routines get invoked, even though it can be different versions of Cisco IOS versions or different device drivers on different cisco products.
Also, apart from this most of the networking devices in MNCs(enterprises), Service Providers, Data Centers, Mobile networks, Security are cisco devices running the same packet handler routines.
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Hands down it will be packet input/output handler in the cisco IOS running on routers. Most of the network devices in Internet Backbone, Internet Exchange, Tier-1 networks, Tier-2 networks are cisco devices. So when any packet is generated/sent across the internet(google search, FB page, slashdot page, news, torrents, photo uploads, whatsapp messages, TOR, Deep Web) the same packet handler routines get invoked, even though it can be different versions of Cisco IOS versions or different device drivers on different cisco products. Also, apart from this most of the networking devices in MNCs(enterprises), Service Providers, Data Centers, Mobile networks, Security are cisco devices running the same packet handler routines.