N10-009 Networking Concepts Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  UDP

  Why it's wrong here

  UDP (User Datagram Protocol) is a connectionless and unreliable protocol that also operates at the Transport layer (Layer 4). Unlike TCP, UDP does not establish a dedicated connection, nor does it provide mechanisms for flow control, error checking, or retransmission of lost data. It simply sends datagrams without guaranteeing delivery or order, making it suitable for applications where speed and low overhead are prioritized over absolute reliability, such as real-time streaming or DNS queries.

  When this WOULD be correct

  UDP would be correct for a question asking: 'Which Transport layer protocol provides low-overhead, connectionless communication suitable for real-time applications like VoIP or streaming?'

• ✓

  TCP

  Why this is correct

  TCP (Transmission Control Protocol) is a fundamental connection-oriented protocol operating at the Transport layer (Layer 4) of the OSI model. It ensures reliable, ordered, and error-checked delivery of data segments between applications. TCP achieves this through mechanisms like three-way handshakes for connection establishment, sequence numbers for ordering, acknowledgments for receipt confirmation, flow control to manage data rates, and retransmission of lost or corrupted packets, guaranteeing data integrity.

• ✗

  IP

  Why it's wrong here

  IP (Internet Protocol) is a core protocol of the Network layer (Layer 3) responsible for logical addressing and routing packets across different networks. It focuses on getting data from a source host to a destination host, potentially across multiple routers, using IP addresses. IP does not provide any guarantees regarding the reliability, order, or error-checking of data delivery; these functions are handled by higher-layer protocols like TCP at the Transport layer.

  When this WOULD be correct

  IP would be correct for a question asking: 'Which network protocol operates at the Network layer and provides logical addressing for routing packets across networks?'

• ✗

  ARP

  Why it's wrong here

  ARP (Address Resolution Protocol) operates primarily at the Data Link layer (Layer 2) and interacts with the Network layer (Layer 3) to resolve logical IP addresses to physical MAC addresses within a local network segment. Its function is to enable devices to find the hardware address of another device on the same broadcast domain for direct frame delivery. ARP is not involved in end-to-end process-to-process communication or data reliability, which are responsibilities of the Transport layer.

  When this WOULD be correct

  A question asking: 'Which protocol maps a known IP address to a MAC address on a local network?' would have ARP as the correct answer.

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 N10-009 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

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