Which of the following messages does a BGP router send to its neighbors when an error condition is detected?
  1. Notification message
  2. Open message
  3. Update message
  4. Keep-alive message
Explanation
Answer - A - BGP sends the notification message to its neighbors when an error condition is detected.

Key Takeaway: Notification messages are used to signal when something is wrong with the BGP session. A notification will be sent when any of the following occurs: an unsupported option is sent in an OPEN message or a peer fails to send an update or keep-alive message. When an error is detected, the BGP session is closed. The open message opens a BGP communication session between peers and is the first message sent by each side after a transport-protocol connection is established. An update message is used to provide routing updates to other BGP systems, allowing routers to construct a consistent view of the network topology. The keep-alive message notifies BGP peers that a device is active.
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