FirstTry

Objective 1.4

N10-009

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

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1-4Networking Concepts

Which mechanism does TCP use to detect duplicate data and reorder segments that arrive out of sequence at the receiving host?

Port numbers assigned to each communicating process on the hostPort numbers support multiplexing multiple processes on a host, not reordering of arriving data.
Window field advertised inside every acknowledgment segment sentThe window field governs flow control by limiting how much unacknowledged data may be sent, not ordering.
Sequence numbers assigned to every octet transmitted in the segment streamCorrect · your answerCorrect: sequence numbers are the mechanism used for reordering and duplicate detection.
Checksum value computed across each transmitted TCP segmentThe checksum detects damaged or corrupted segments, not out-of-order or duplicate delivery.

Correct.

Checked against cloudflare.com, August 2026

Concept

TCP reliability depends on numbering every transmitted octet so the receiver can detect gaps, duplicates, and out-of-order arrival.

Why C

Sequence numbers are assigned to each octet transmitted, letting the receiving TCP reorder segments and eliminate duplicates before delivering data to the application.

Source

This is achieved by assigning a sequence number to each octet transmitted, and requiring a positive acknowledgment (ACK) from the receiving TCP. If the ACK is not received within a timeout interval, the data is retransmitted. At the receiver, the sequence numbers are used to correctly order segments that may be received out of order and to eliminate duplicates.

RFC 793: Transmission Control Protocol, checked August 2026
#tcp#reliability#sequence-numbers#networking-concepts

Now you: objective 1.4 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

1-4Networking Concepts

A technician configures a company's domain name server to store every DNS record for the company's own domain and to answer matching queries directly, without querying any other DNS server. Which DNS server role is being configured?

Sample question 2 of 3

1-4Networking Concepts

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

1-4Networking Concepts

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