350-501 Security and Services Practice Question
An SP is deploying Deep Packet Inspection (DPI) to classify traffic for QoS and security. Which DPI technique is used to identify applications regardless of port numbers?
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
✓
Signature-based pattern matching
DPI inspects packet payloads using signatures, pattern matching, or behavioral analysis to identify applications, even if they use non-standard ports.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IP address filtering
Why it's wrong here
IP filtering does not identify applications.
- ✗
Port-based classification
Why it's wrong here
Port-based classification relies on well-known ports and can be evaded.
- ✓
Signature-based pattern matching
Why this is correct
Signature matching identifies application-specific patterns in payload.
- ✗
NetFlow analysis
Why it's wrong here
NetFlow provides flow statistics but not deep payload inspection.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.