FirstTry
Objective 2.2220-1201

2.2 Explain wireless networking technologies.

Objective 2.2 sits in Networking, which carries 23% of the A+ Core 1 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.

NetworkingEasy

A technician runs a Wi-Fi analyzer on a wireless LAN and filters captured packets by the protocol number carried in each IP header. Which decimal value identifies traffic using the User Datagram Protocol?

Correct.

The concept

UDP is registered as a specific protocol number carried in the IP header so that receiving hosts know how to parse the payload.

Why this answer

UDP is assigned protocol number 17 (21 octal) for use within the Internet Protocol, so captured datagrams using UDP carry that value in the IP protocol field.

  • A6 belongs to TCP in the same registry. A capture filtered on 6 returns the connection-oriented half of the traffic.
  • 17 correctly identifies UDP traffic in the IP header protocol field.
  • C21 is an FTP control port, and ports are read out of the transport header rather than the IP header.
  • DDNS answers on port 53. That value never appears in the field this filter is reading.
Read the sourceRFC 768 - User Datagram Protocol
Source-cited
wirelessudpprotocol-numberwi-fi-analyzer

Now you: objective 2.2 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

NetworkingModerate

A wireless security camera streams live video to a mobile app. Its vendor selects a transport protocol that skips retransmission and ordering guarantees to keep latency low over the wireless link. Which protocol is being used?

Sample question 2 of 3

NetworkingModerate

A technician configures a SOHO wireless router so smart bulbs and a printer can communicate with each other on the WLAN without needing direct internet access. Which addressing approach fits this requirement?

Sample question 3 of 3

NetworkingHard

While troubleshooting intermittent wireless connectivity, a technician captures UDP traffic and finds that every packet's checksum field is transmitted as all zeros. Which conclusion is supported by this observation?

That’s 3 of the full A+ Core 1 bank.

Keep going free: 10 questions per certification in bank practice, with no account.

Continue practicing

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