John upgraded his internet but his laptop says it only has 2.4 GHz available. Leo says that means his router is only 2.4 GHz. 802.11N routers are dual band with 2.4 and 5 Ghz bands. And there's even tri-band routers that offer two 5 GHz channels along with a 2.4 GHz channel. His laptop may also just be able to connect to 2.4 Ghz. John should look in his BIOS and software to see if the 5.0 GHz band is turned off.
John is frustrated with the slow speed of his wireless connection. Leo says it largely depends on the speed. 802.11n is the fastest, but it's being supplanted by 80211.ac. John has an 802.11g router and that's not as fast as n. The farther away a router is, the slower the Wi-Fi signal gets. Congestion by competing Wi-Fi access points can be an issue as well, since everyone is on the same spectrum - 2.4Ghz. That's why Leo recommends using dual band routers which also run on the 5Ghz band spectrum.
Andy has a cheap N router and wants to know if his connection would be faster with an AC router. Leo says no. AC is actually faster than the Internet connection itself. It works for AC enabled hardware and in-network transfers, but it won't really make his internet faster.
Mike is having connectivity issues with his home network and is wondering if he needs a new router. He has a desktop, three laptops, and a smart TV. Is that too many? Leo says yes and no. It depends on what he's doing. If everyone is streaming Netflix at the same time, the bandwidth won't really handle all that activity. On the other hand, if everyone is just emailing, then it should be fine. Four or five devices shouldn't be a problem. If his router is 4 or 5 years old, then it may be showing its age.