What is sent first after a TCP connection between two BGP routers is established?

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Multiple Choice

What is sent first after a TCP connection between two BGP routers is established?

Explanation:
Open messages are sent first. After the TCP connection is established, the two BGP speakers immediately exchange OPEN messages to establish the session parameters—BGP version, their AS numbers, the hold timer, the BGP identifier, and any optional capabilities. If both OPENs are accepted, the session is established and they then exchange KEEPALIVE messages to maintain the session and UPDATE messages to advertise routes. NOTIFICATION messages are used only to report errors.

Open messages are sent first. After the TCP connection is established, the two BGP speakers immediately exchange OPEN messages to establish the session parameters—BGP version, their AS numbers, the hold timer, the BGP identifier, and any optional capabilities. If both OPENs are accepted, the session is established and they then exchange KEEPALIVE messages to maintain the session and UPDATE messages to advertise routes. NOTIFICATION messages are used only to report errors.

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