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A company is multihomed to several Internet providers using EBGP. Which two measures guarantee that the network of the company does not become a transit AS for Internet traffic? (Choose two.)
Correct Answer: C,D
Explanation/Reference: Explanation: By default BGP will advertise all prefixes to EBGP (External BGP) neighbors. This means that if you are multi-homed (connected to two or more ISPs) that you might become a transit AS. Let me show you an example: R1 is connected to ISP1 and ISP2 and each router is in a different AS (Autonomous System). Since R1 is multi-homed it's possible that the ISPs will use R1 to reach each other. In order to prevent this we'll have to ensure that R1 only advertises prefixes from its own autonomous system. As far as I know there are 4 methods how you can prevent becoming a transit AS: Reference: http://networklessons.com/bgp/bgp-prevent-transit-as/