200-901 Network Fundamentals Practice Question
Which transport layer protocol is used by HTTP and guarantees reliable delivery?
⚠ Common exam trap
Cisco often tests the distinction between transport layer protocols by pairing HTTP with TCP, but the trap here is that candidates may confuse HTTP's use of TCP with other protocols like UDP (used by DNS or VoIP) or think IP provides reliability, when in fact IP only handles routing and fragmentation without delivery guarantees.
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
✓
TCP
HTTP relies on TCP (Transmission Control Protocol) as its transport layer protocol because TCP provides reliable, connection-oriented data delivery. TCP ensures that all HTTP requests and responses are delivered in order, without loss or duplication, by using acknowledgments, retransmissions, and sequence numbers. This reliability is essential for HTTP, which expects complete and correct data transfer for web pages and resources.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
TCP
Why this is correct
Correct. HTTP uses TCP.
- ✗
ICMP
Why it's wrong here
ICMP is used for diagnostics like ping.
- ✗
IP
Why it's wrong here
IP is a network layer protocol.
- ✗
UDP
Why it's wrong here
UDP is unreliable and not used by HTTP.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.