Quick Answer
The answer is the BGP UPDATE message. This is the correct choice because the BGP UPDATE message is the only message type designed to carry both Network Layer Reachability Information (NLRI) for route advertisements and path attributes, while also being able to withdraw previously advertised routes by including withdrawn routes in the same message. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of BGP’s core operational messages, often appearing in questions that distinguish UPDATE from OPEN, KEEPALIVE, or NOTIFICATION messages. A common trap is confusing the UPDATE message with the KEEPALIVE message, but remember that KEEPALIVE only maintains the session and carries no routing data. For a quick memory tip, think of UPDATE as the “UPS” of BGP: it can add, change, or remove routes, just like a delivery service can drop off, swap, or pick up packages.
This 300-410 practice question tests your understanding of bgp troubleshooting. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which BGP message type is used to advertise, withdraw, and update routes?
OPEN
Why wrong: OPEN messages establish the BGP session and negotiate capabilities.
UPDATE
Correct. UPDATE messages carry route information.
NOTIFICATION
Why wrong: NOTIFICATION messages indicate error conditions and close the session.
KEEPALIVE
Why wrong: KEEPALIVE messages maintain the session without updates.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
UPDATE
BGP UPDATE messages carry path attributes and NLRI for route advertisements and withdrawals.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
OPEN
Why it's wrong here
OPEN messages establish the BGP session and negotiate capabilities.
UPDATE
Why this is correct
Correct. UPDATE messages carry route information.
Related concept
Static NAT maps one inside address to one outside address.
NOTIFICATION
Why it's wrong here
NOTIFICATION messages indicate error conditions and close the session.
KEEPALIVE
Why it's wrong here
KEEPALIVE messages maintain the session without updates.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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FAQ
BGP Troubleshooting — This question tests BGP Troubleshooting — Static NAT maps one inside address to one outside address..
The correct answer is: UPDATE — BGP UPDATE messages carry path attributes and NLRI for route advertisements and withdrawals.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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