- A
It provides logical addressing and routing to determine the best path for data.
Why wrong: Logical addressing and routing are functions of the Network layer (Layer 3).
- B
It segments data from the upper layers and manages end-to-end flow control.
The Transport layer segments data into smaller units and can use flow control mechanisms (e.g., TCP's windowing) to prevent overwhelming the receiver.
- C
It converts data into electrical signals for transmission over the physical medium.
Why wrong: Converting data into electrical signals is the function of the Physical layer (Layer 1).
- D
It provides reliable or unreliable delivery of data between applications on different hosts.
The Transport layer offers reliable delivery (TCP) with acknowledgments and retransmissions, or unreliable delivery (UDP) without such guarantees.
- E
It encapsulates data into frames and adds source and destination MAC addresses.
Why wrong: Framing and MAC addressing are functions of the Data Link layer (Layer 2).
Quick Answer
The correct answer identifies that the Transport layer segments data from upper layers and manages end-to-end flow control. This is because Layer 4, using protocols like TCP, breaks large application data into smaller segments for efficient transmission and employs mechanisms such as the sliding window to regulate the rate of data flow, preventing a fast sender from overwhelming a slower receiver. On the CCNA 200-301 v2 exam, this question tests your ability to distinguish Layer 4 responsibilities from those of the Network layer (logical addressing and routing) and the Data Link layer (framing with MAC addresses). A common trap is confusing flow control with congestion control—remember that flow control is end-to-end between hosts, while congestion control is network-wide. For a quick memory tip, think of the Transport layer as the "traffic manager" that segments your data and keeps the conversation flowing smoothly between two applications.
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements accurately describe the responsibilities of the OSI model's Transport layer?
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
It segments data from the upper layers and manages end-to-end flow control.
Option B is correct because the Transport layer (Layer 4) segments data from upper layers and manages end-to-end flow control using mechanisms like TCP's sliding window to prevent overwhelming a slow receiver. Option D is correct because the Transport layer provides either reliable delivery (TCP) or unreliable delivery (UDP) between applications on different hosts, ensuring data reaches the appropriate application via port numbers. Option A is incorrect because logical addressing and routing are functions of the Network layer (Layer 3). Option C is incorrect because converting data into electrical signals is the responsibility of the Physical layer (Layer 1). Option E is incorrect because encapsulating data into frames with MAC addresses is a function of the Data Link layer (Layer 2).
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It provides logical addressing and routing to determine the best path for data.
Why it's wrong here
Logical addressing and routing are functions of the Network layer (Layer 3).
- ✓
It segments data from the upper layers and manages end-to-end flow control.
Why this is correct
The Transport layer segments data into smaller units and can use flow control mechanisms (e.g., TCP's windowing) to prevent overwhelming the receiver.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It converts data into electrical signals for transmission over the physical medium.
Why it's wrong here
Converting data into electrical signals is the function of the Physical layer (Layer 1).
- ✓
It provides reliable or unreliable delivery of data between applications on different hosts.
- ✗
It encapsulates data into frames and adds source and destination MAC addresses.
Why it's wrong here
Framing and MAC addressing are functions of the Data Link layer (Layer 2).
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓It segments data from the upper layers and manages end-to-end flow control.Correct answer▾
Why this is correct
The Transport layer segments data into smaller units and can use flow control mechanisms (e.g., TCP's windowing) to prevent overwhelming the receiver.
✗It provides logical addressing and routing to determine the best path for data.Wrong answer — click to see why▾
Why this is wrong here
Logical addressing and routing are functions of the Network layer (Layer 3), not the Transport layer. The Transport layer is concerned with end-to-end communication and data segmentation, not path determination.
Why candidates choose this
Students often confuse the Transport layer with the Network layer because both deal with end-to-end delivery. However, the Network layer handles logical addressing and routing, while the Transport layer manages the connection between applications.
✗It converts data into electrical signals for transmission over the physical medium.Wrong answer — click to see why▾
Why this is wrong here
Converting data into electrical signals is the function of the Physical layer (Layer 1), which deals with the actual transmission of bits over the physical medium. The Transport layer operates above the Physical layer and does not handle signal conversion.
Why candidates choose this
Students may think that all layers eventually convert data to signals, but this specific conversion is exclusive to the Physical layer. The Transport layer works with segments and does not interact directly with the physical medium.
✗It encapsulates data into frames and adds source and destination MAC addresses.Wrong answer — click to see why▾
Why this is wrong here
Encapsulating data into frames and adding source and destination MAC addresses are functions of the Data Link layer (Layer 2). The Transport layer works with segments and uses port numbers, not MAC addresses.
Why candidates choose this
Students often confuse encapsulation at different layers. The Transport layer adds a header with port numbers, but framing and MAC addressing occur at the Data Link layer. This confusion is common when learning the OSI model.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between Transport layer flow control (end-to-end) and Network layer congestion control (path-based), leading candidates to confuse Layer 4 segmentation with Layer 3 routing functions.
Detailed technical explanation
How to think about this question
The Transport layer uses protocols like TCP (RFC 793) for reliable, connection-oriented delivery with features such as sequence numbers, acknowledgments, and retransmission, or UDP (RFC 768) for unreliable, connectionless delivery. Flow control at this layer is implemented via TCP's receive window, which dynamically adjusts based on the receiver's buffer capacity, preventing congestion at the endpoint. In real-world scenarios, misconfigured window sizes can cause performance issues in high-latency WAN links, often addressed by TCP window scaling (RFC 1323).
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It segments data from the upper layers and manages end-to-end flow control. — Option B is correct because the Transport layer (Layer 4) segments data from upper layers and manages end-to-end flow control using mechanisms like TCP's sliding window to prevent overwhelming a slow receiver. Option D is correct because the Transport layer provides either reliable delivery (TCP) or unreliable delivery (UDP) between applications on different hosts, ensuring data reaches the appropriate application via port numbers. Option A is incorrect because logical addressing and routing are functions of the Network layer (Layer 3). Option C is incorrect because converting data into electrical signals is the responsibility of the Physical layer (Layer 1). Option E is incorrect because encapsulating data into frames with MAC addresses is a function of the Data Link layer (Layer 2).
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This 200-301 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 200-301 exam.
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