CCNA All in One

802.11ac, the emerging standard from the IEEE, is like the movie  The Godfather Part II . It takes something great and makes it even better. 802.11ac is a faster and more scalable version of 802.11n. It couples the freedom of wireless with the capabilities of Gigabit Ethernet. Wireless LAN sites will see significant improvements in the number of clients supported by an access point (AP), a better experience for each client, and more available bandwidth for a higher number of parallel video streams. Even when the network is not fully loaded, users see a benefit: their file downloads and email sync happen at low‑lag gigabit speeds. Also, device battery life is extended, since the device’s Wi-Fi interface can wake up, exchange data with its AP, and then revert to dozing that much more quickly. 802.11ac achieves its raw speed increase by pushing on three different dimensions: ●     More channel bonding, increased from a maximum of 40 MHz with 802.11n up to 80 or ...

We really want to show you why we need BGP first but it is very difficult to explain without understanding a bit about BGP. So we will learn some basic knowledge about BGP first. First we need to understand about the different between Interior Gateway Protocol and Exterior Gateway Protocol. The difference between them is shown below: –  Interior Gateway Protocol (IGP) : A routing protocol operating within an Autonomous System (AS) like OSPF, EIGRP… Usually routers running IGP are under the same administration (of a company, corporation, individual) –  Exterior Gateway Protocol (EGP) : A routing protocol operating between different AS. BGP is the only EGP used nowadays In the topology above R1, R2 and R3 should run an IGP to communicate with each other because they are in the same AS. But to connect with other routers in another AS (like a different ISP), R1 and R3 must use an EGP. With BGP, the term  autonomous system  (AS) refers to a network that oper...