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Cisco 350-501 Exam - Topic 4 Question 132 Discussion

While implementing TTL security, an engineer issues the PE(config-router-af)#neighbor 2.2.2.2 ttl-security hops 2 command. After issuing this command, which BGP packets does the PE accept?
C) from 2.2.2.2, with a TTL of 253 or more
A) from 2.2.2.2, with a TTL of less than 2
B) to 2.2.2.2, with a TTL of less than 253
D) to 2.2.2.2, with a TTL of 2 or more

Cisco 350-501 Exam - Topic 4 Question 132 Discussion

Actual exam question for Cisco's 350-501 exam
Question #: 132
Topic #: 4
[All 350-501 Questions]

While implementing TTL security, an engineer issues the PE(config-router-af)#neighbor 2.2.2.2 ttl-security hops 2 command. After issuing this command, which BGP packets does the PE accept?

Show Suggested Answer Hide Answer
Suggested Answer: C

Thettl-security hops <number>command sets the maximum number of hops that a BGP message can traverse. In this case, settingttl-security hops 2means that the router will accept BGP packets from a neighbor (2.2.2.2) only if the TTL is 253 or more. This is because the default TTL value is 255, and for each hop, the TTL is decremented by 1. Therefore, a packet from a directly connected neighbor would have a TTL of 254 when it reaches the PE router. If the packet has traversed one more router (making it two hops away), the TTL would be 253 upon arrival.


by Annelle at Jul 19, 2026, 05:02 AM

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Timothy
20 hours ago
I feel like option D makes sense too. It’s about the packets sent to the neighbor.
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Nohemi
6 days ago
I think it's option C. Only packets with high TTL should be accepted.
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Nathalie
11 days ago
Yeah, I agree with C. That's how TTL security works!
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Roxane
16 days ago
Just to clarify, it's about incoming packets, not outgoing.
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Raina
21 days ago
Wait, are we sure about that? Sounds off to me.
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Jerry
27 days ago
I think it's D. TTL of 2 or more makes sense.
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Stefania
1 month ago
It's definitely C, right? TTL of 253 or more.
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Paris
1 month ago
I thought the command was supposed to allow packets with a higher TTL, so I'm thinking option C makes sense, but I could be wrong.
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Shannan
1 month ago
I feel like the TTL security is meant to prevent packets from too far away, so maybe it's option D? But I can't recall the exact details.
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Alysa
2 months ago
I think we practiced a similar question where we had to determine which packets were accepted based on TTL settings. I might lean towards option C.
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Lynsey
2 months ago
I remember something about TTL values, but I'm not sure if it's about accepting packets or rejecting them.
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