Practice Test Geeks(CMT) Certified Mobile Tech Practice Test
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Network Technologies & Connectivity Flashcards

7 cards from real CMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Network Technologies & Connectivity flashcards as text

  1. What is the maximum theoretical range of Bluetooth Classic in an open environment?

    Answer: 100 meters (Class 1)

    Class 1 Bluetooth devices can reach up to 100 meters, though most consumer devices are Class 2 with a practical range of about 10 meters.

  2. Which 5G spectrum band provides the fastest speeds but the shortest range and worst building penetration?

    Answer: mmWave (FR2) 24–100 GHz

    mmWave (millimeter wave) 5G offers multi-gigabit speeds but has very short range (hundreds of meters) and is blocked by walls and even rain.

  3. What is the purpose of the IMSI stored on a SIM card?

    Answer: Uniquely identifies the subscriber to the mobile network

    The International Mobile Subscriber Identity (IMSI) is a unique number that identifies a subscriber and their home network to the carrier.

  4. A phone running Android cannot connect to any Wi-Fi network after a screen replacement. The technician notices the Wi-Fi MAC address shows 'unavailable.' What is the most likely cause?

    Answer: Wi-Fi chip damaged during repair or antenna cable disconnected

    A missing or 'unavailable' MAC address after a repair indicates the Wi-Fi chip was damaged by ESD or heat, or the antenna/flex cable is disconnected.

  5. Which protocol does VoLTE (Voice over LTE) use to carry voice calls over a 4G network?

    Answer: IMS (IP Multimedia Subsystem) using SIP and RTP

    VoLTE uses the IP Multimedia Subsystem (IMS) with SIP for call signaling and RTP for the actual voice data, treating calls as data packets.

  6. A customer's phone connects to Wi-Fi and shows an IP address, but cannot browse the internet. Pinging the router succeeds. What should the technician check next?

    Answer: Check DNS settings — the device likely has a misconfigured or unreachable DNS server

    If the device can ping the router but not reach the internet, DNS resolution is typically the culprit — the device can't translate domain names to IP addresses.

  7. What does the term 'band steering' refer to in dual-band Wi-Fi routers?

    Answer: Automatically directing capable devices to the less congested or faster 5 GHz band

    Band steering is a router feature that encourages dual-band clients to connect on 5 GHz when signal quality allows, optimizing overall network performance.