The answer is that a BGP route must have a reachable next-hop via an IGP route and must be selected as the best path for the prefix. These two conditions ensure the route is both valid and usable for forwarding traffic, as BGP will only install a route into the routing table when the next-hop is resolvable through an interior gateway protocol and the path is the most preferred among all available options. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of BGP path selection and route installation logic, often appearing as a trap where candidates confuse synchronization or AS-path loop detection with validity conditions. A common memory tip is to think of the "two gates": the next-hop must be reachable (gate one), and the route must be the best (gate two)—only then does BGP consider it valid for forwarding.
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. 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 TWO conditions must be met for a BGP route to be considered valid and used for forwarding?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The route must be the best path selected by BGP.
Options A and D are correct. A valid BGP route must have a reachable next-hop (A) and must be the best path for the prefix (D). Option B is not required; synchronization is not needed in modern networks. Option C is incorrect; the prefix must be in the routing table, not the BGP table. Option E is incorrect; AS path loop detection is inherent, but not a validity condition per se.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The BGP synchronization must be enabled.
Why it's wrong here
Incorrect. Synchronization is deprecated.
✗
The AS path must not contain the router's own AS.
Why it's wrong here
Incorrect. This is for loop prevention but not a validity condition for best path selection.
✓
The route must be the best path selected by BGP.
Why this is correct
Correct. Only the best path is installed in the routing table.
Related concept
Static NAT maps one inside address to one outside address.
✗
The prefix must be in the BGP table.
Why it's wrong here
Incorrect. Being in the BGP table does not guarantee validity.
✓
The next-hop IP must be reachable via an IGP route.
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
How this comes up in practice
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
Got this wrong? Here's your next step.
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 350-501 NAT questions on configuration and troubleshooting.
Networking — This question tests Networking — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The route must be the best path selected by BGP. — Options A and D are correct. A valid BGP route must have a reachable next-hop (A) and must be the best path for the prefix (D). Option B is not required; synchronization is not needed in modern networks. Option C is incorrect; the prefix must be in the routing table, not the BGP table. Option E is incorrect; AS path loop detection is inherent, but not a validity condition per se.
What should I do if I get this 350-501 question wrong?
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 350-501 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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