Data Link Layer Functions
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Questions and Answers

What is the primary function of the Data Link Layer?

  • To route packets between different networks
  • To encapsulate Layer 3 packets into Layer 2 frames (correct)
  • To control the flow of data between nodes
  • To assign IP addresses to devices

    • What is the purpose of the LLC sublayer?

  • To provide error detection and correction
  • To manage media access control
  • To assign IP addresses to devices
  • To communicate between networking software and device hardware (correct)

    • What is the function of the MAC sublayer?

  • To assign IP addresses to devices
  • To route packets between different networks
  • To provide logical link control
  • To manage media access control and data encapsulation (correct)

    • What is the purpose of the Data Link Layer in terms of error detection?

    <p>To reject corrupted frames</p> Signup and view all the answers

    What is the relationship between the Data Link Layer and the Physical Layer?

    <p>The Data Link Layer converts information into a format supported by the Physical Layer</p> Signup and view all the answers

    What is the purpose of the IEEE 802 LAN/MAN standards?

    <p>To standardize network protocols across different networks</p> Signup and view all the answers

    What is the function of the Data Link Layer in terms of Layer 3 packets?

    <p>To encapsulate Layer 3 packets into Layer 2 frames</p> Signup and view all the answers

    What is the purpose of the Data Link Layer in terms of network interfaces?

    <p>To allow multiple Layer 3 protocols to use the same network interface and media</p> Signup and view all the answers

    What does the data link layer 'see' when controlling data access to the media?

    <p>Logical topology</p> Signup and view all the answers

    What is the primary purpose of the Data Link Layer?

    <p>To provide access to media</p> Signup and view all the answers

    What is the result of a duplex mismatch between two interconnected interfaces?

    <p>Inefficiency and latency on the link</p> Signup and view all the answers

    What influences the type of network framing and media access control used?

    <p>Logical topology</p> Signup and view all the answers

    What is the function of the MAC sublayer?

    <p>To resolve contention for access on the network medium</p> Signup and view all the answers

    What is the simplest and most common WAN topology?

    <p>Point-to-point</p> Signup and view all the answers

    What is the process called when a router receives a frame, de-encapsulates the packet, and re-encapsulates it into a new frame?

    <p>Store-and-forward switching</p> Signup and view all the answers

    What is a characteristic of a hub and spoke WAN topology?

    <p>Branch sites cannot exchange data without going through the central site</p> Signup and view all the answers

    What is a benefit of a mesh WAN topology?

    <p>High availability</p> Signup and view all the answers

    What type of communication allows both devices to simultaneously transmit and receive on a shared medium?

    <p>Full-duplex communication</p> Signup and view all the answers

    What is the primary function of a router interface?

    <p>To encapsulate packets into frames</p> Signup and view all the answers

    What is a characteristic of a physical point-to-point WAN topology?

    <p>Nodes do not share the media with other hosts</p> Signup and view all the answers

    What is a benefit of using a serial communications protocol like Point-to-Point Protocol (PPP) in a WAN?

    <p>Node does not have to determine frame destination</p> Signup and view all the answers

    How do devices operate when they have the same duplex mode?

    <p>They operate efficiently</p> Signup and view all the answers

    What is a characteristic of Point-to-Point WAN protocols?

    <p>Very simple</p> Signup and view all the answers

    What happens to packets as they travel from a local host to a remote host?

    <p>They may experience numerous data link layers and media transitions</p> Signup and view all the answers

    What happens when two devices transmit at the same time?

    <p>A collision occurs</p> Signup and view all the answers

    What mode do CSMA/CD and CSMA/CA operate in?

    <p>Half-duplex mode</p> Signup and view all the answers

    What is the purpose of the collision detection process in CSMA/CD?

    <p>To govern when a device can send and what happens if multiple devices send at the same time</p> Signup and view all the answers

    What happens to the data sent by both devices in the event of a collision?

    <p>It is corrupted and needs to be re-sent</p> Signup and view all the answers

    What is an Ethernet hub also known as?

    <p>A multiport repeater</p> Signup and view all the answers

    What is the main difference between CSMA/CD and CSMA/CA?

    <p>CSMA/CD is used by legacy Ethernet LANs, while CSMA/CA is used by IEEE 802.11 WLANs</p> Signup and view all the answers

    What does the NIC compare during the collision detection process?

    <p>The data transmitted with the data received</p> Signup and view all the answers

    What is the purpose of the collision avoidance process in CSMA/CA?

    <p>To avoid collisions by waiting before transmitting</p> Signup and view all the answers

    What is the purpose of including the time duration in the transmission in CSMA/CA?

    <p>To inform other devices when the medium will be unavailable</p> Signup and view all the answers

    Why do Ethernet LANs using switches not use a contention-based system?

    <p>Because they operate in full-duplex mode</p> Signup and view all the answers

    What is the purpose of the data link layer wrapping the Layer 3 PDU with a header and trailer?

    <p>To make the data intelligible between Layer 3 of the sending and receiving hosts</p> Signup and view all the answers

    What is the primary function of the data link protocol?

    <p>To enable NIC-to-NIC communications within the same network</p> Signup and view all the answers

    What are the three parts of a data link frame?

    <p>Header, Data, Trailer</p> Signup and view all the answers

    What determines the amount of control information carried in a data link frame?

    <p>The access control information and logical topology</p> Signup and view all the answers

    What is the purpose of the header and trailer in a data link frame?

    <p>To carry control information</p> Signup and view all the answers

    What is the result of the CSMA/CA collision avoidance process?

    <p>Devices know how long the medium will be unavailable</p> Signup and view all the answers

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