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.

• ✗

  TCP

  Why it's wrong here

  Transmission Control Protocol (TCP) is a connection-oriented transport layer protocol that provides reliable, ordered, and error-checked delivery of a stream of bytes between applications. It establishes a session using a three-way handshake before data transfer and employs mechanisms like sequence numbers, acknowledgments, and retransmissions to ensure data integrity and delivery. While also a transport layer protocol, TCP's overhead for reliability makes it distinct from connectionless protocols like UDP.

  When this WOULD be correct

  If the question asked 'Which of the following is a connection-oriented protocol at the transport layer?', then TCP would be the correct answer.

• ✓

  UDP

  Why this is correct

  User Datagram Protocol (UDP) is a connectionless transport layer protocol. It prioritizes speed and low overhead by sending data packets, called datagrams, without first establishing a formal connection or guaranteeing delivery. This makes UDP suitable for applications where real-time performance is critical, such as streaming video, online gaming, and DNS lookups, where occasional packet loss is acceptable. However, it offers no error checking, retransmission, or flow control mechanisms.

• ✗

  ICMP

  Why it's wrong here

  Internet Control Message Protocol (ICMP) is a Network layer (Layer 3) protocol primarily used for sending error messages and operational information, such as whether a requested service is unavailable or if a host or router cannot be reached. Common diagnostic tools like `ping` and `traceroute` rely on ICMP messages to test network connectivity and path. Unlike transport layer protocols, ICMP does not facilitate data exchange between applications or manage end-to-end communication sessions.

  When this WOULD be correct

  A question asking 'Which protocol is used for error reporting and diagnostic functions at the network layer?' would make ICMP the correct answer.

• ✗

  ARP

  Why it's wrong here

  Address Resolution Protocol (ARP) operates at the Data Link layer (Layer 2) of the OSI model, not the Transport layer. Its primary function is to dynamically resolve a known Internet Protocol (IP) address to a physical Media Access Control (MAC) address on a local network segment. ARP is crucial for enabling communication between devices on the same broadcast domain by mapping logical addresses to hardware addresses, but it does not handle end-to-end data transfer or session management.

  When this WOULD be correct

  A question asking which protocol is used to map an IP address to a MAC address on a local network, or which protocol operates at Layer 2 and is essential for Ethernet communication.

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?”

Same concept, more angles

1 more way this is tested on N10-009

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.