This is why the NSA has a program named “Genie” they spend over $650 million on to hack the internet sources of other countries to monitor information. Most of this programs resources seem to be focused on China, Russia, Iran, and North Korea, with the goal of maintaining up to date knowledge regarding their nuclear weapons.
The NSA is able to create templates to gain access into specific routers due to their almost certain lack of security. One of the most significant benefits to controlling a router is the ability to control the traffic. So, when the NSA has access to a router they can shut off some or all communication ability at their will.
The NSA prefers hacking routers and switches.