350-501 Security and Services Practice Question
An SP is deploying DDoS mitigation using BGP FlowSpec. Which THREE types of actions can be encoded in a FlowSpec rule? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Drop traffic
FlowSpec rules can include traffic rate-limiting, redirecting to a VRF (e.g., for scrubbing), and dropping traffic. Setting a BGP community is not a FlowSpec action; community is for routing policy. IPsec encryption is not a FlowSpec action.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set a BGP community
Why it's wrong here
Setting a community is not a FlowSpec action; it's a routing policy action.
- ✓
Drop traffic
Why this is correct
FlowSpec can drop packets.
- ✗
Encrypt traffic with IPsec
Why it's wrong here
IPsec is not part of FlowSpec.
- ✓
Redirect traffic to a VRF
Why this is correct
FlowSpec can redirect traffic for scrubbing.
- ✓
Rate-limit traffic
Why this is correct
FlowSpec can rate-limit matching traffic.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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