1.4 Explain common networking ports, protocols, services, and traffic types.
Objective 1.4 sits in Networking Concepts, which carries 23% of the Network+ exam. The questions below are original, written from the official objective title above, and each explanation cites the CompTIA page it rests on.
Objective title verbatim from the official objectives. CompTIA exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
Which mechanism does TCP use to detect duplicate data and reorder segments that arrive out of sequence at the receiving host?
The concept
TCP reliability depends on numbering every transmitted octet so the receiver can detect gaps, duplicates, and out-of-order arrival.
Why this answer
Sequence numbers are assigned to each octet transmitted, letting the receiving TCP reorder segments and eliminate duplicates before delivering data to the application.
- Correct: sequence numbers are the mechanism used for reordering and duplicate detection.
- BPort numbers support multiplexing multiple processes on a host, not reordering of arriving data.
- CThe window field governs flow control by limiting how much unacknowledged data may be sent, not ordering.
- DThe checksum detects damaged or corrupted segments, not out-of-order or duplicate delivery.
Now you: objective 1.4 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
A protocol analyzer captures a UDP datagram whose checksum field reads all ones (0xFFFF). According to RFC 768, what does this value indicate about the sender's checksum computation?
Sample question 2 of 3
A file-transfer application requires assurance that all data it has already handed to TCP is forwarded to the receiving process promptly, instead of sitting in a send buffer. Which TCP feature accomplishes this?
Sample question 3 of 3
A DNS root server operator advertises the same IP address from many physical locations worldwide, so every incoming query is automatically routed to the nearest instance. Which traffic type does this network design rely on?
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Read the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.
More objectives in Networking Concepts
- 1.1 1.1 Explain concepts related to the Open Systems Interconnection (OSI) reference model.
- 1.2 1.2 Compare and contrast networking appliances, applications, and functions.
- 1.3 1.3 Summarize cloud concepts and connectivity options.
- 1.6 1.6 Compare and contrast network topologies, architectures, and types.
- 1.7 1.7 Given a scenario, use appropriate IPv4 network addressing.