Practice Test GeeksCisco CCNA Practice Test
← All Cisco CCNA Flashcard Decks

OSI and TCP/IP Models Flashcards

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

Read the first 7 OSI and TCP/IP Models flashcards as text

  1. A switch receives a frame with an unknown destination MAC address. What does it do?

    Answer: Floods the frame out all ports except the one it was received on

    When a switch receives a frame with an unknown unicast destination MAC, it floods the frame out all ports except the ingress port (unknown unicast flooding).

  2. At which OSI layer does a hub operate?

    Answer: Layer 1 - Physical

    A hub operates at Layer 1 (Physical) and simply repeats electrical signals out all ports without examining MAC or IP addresses.

  3. Which field in the Ethernet frame is used at the OSI Data Link layer to detect transmission errors?

    Answer: Frame Check Sequence (FCS)

    The Frame Check Sequence (FCS) uses a CRC algorithm to detect bit errors in the Ethernet frame at the Data Link layer.

  4. Which TCP/IP model layer corresponds to both the OSI Session and Presentation layers?

    Answer: Application

    The TCP/IP Application layer combines the functions of OSI layers 5 (Session), 6 (Presentation), and 7 (Application).

  5. What type of address does the OSI Network layer use to deliver packets between networks?

    Answer: Logical (IP) address

    The Network layer (Layer 3) uses logical IP addresses to identify source and destination hosts across different networks.

  6. A network administrator notices that a host can communicate within its own subnet but cannot reach remote networks. Which OSI layer device is most likely misconfigured?

    Answer: Router (Layer 3)

    Routers operate at Layer 3 and are responsible for forwarding traffic between different networks; a misconfigured default gateway or routing table would cause this symptom.

  7. Which protocol at the TCP/IP Internet layer is used to report error messages and operational information, such as host unreachable?

    Answer: ICMP

    ICMP (Internet Control Message Protocol) operates at the Internet layer and sends error messages such as 'Destination Unreachable' and is used by the ping utility.