350-501 Security and Services Practice Question
An SP is implementing BGP FlowSpec to mitigate DDoS. The FlowSpec rule should match traffic with destination port 80 and DSCP value 0. Which FlowSpec component is used to specify the destination port?
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
✓
Type 3: Destination Port
FlowSpec defines traffic matching criteria using components like destination port (type 3), source port (type 2), etc. Destination port is type 3.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Type 3: Destination Port
Why this is correct
Destination port component matches the destination L4 port.
- ✗
Type 2: Source Port
Why it's wrong here
Source port matches source port, not destination.
- ✗
Type 4: ICMP Type
Why it's wrong here
ICMP type is for ICMP messages.
- ✗
Type 1: Destination Prefix
Why it's wrong here
Destination prefix matches IP address, not port.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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