I know - the question sounds dumb, but I've written the exam 4 times and failed each time (twice of them with 835) getting on "WAN Services" 17%
e.g.
Bridging&Switching 83%
OSI Model&Layered Communications 83%
Routed Protocols 92%
Routing Proticols 89%
WAN Services 17%
Network...
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