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Ethernet Flashcards Chapter 5
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Ethernet Flashcards Chapter 5

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Questions and Answers

Which destination address is used in an ARP request frame?

  • 255.255.255.255
  • 0.0.0.0
  • FFFF.FFFF.FFFF (correct)
  • 01-00-5E-00-AA-23

    • Is this a characteristic of cut-through or store-and-forward? Always stores the entire frame.

    store-and-forward

    Is this a characteristic of cut-through or store-and-forward? Checks the CRC before forwarding.

    store-and-forward

    Is this a characteristic of cut-through or store-and-forward? Checks the frame length before forwarding.

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

    Is this a characteristic of cut-through or store-and-forward? Does not forward broadcasts.

    <p>cut-through</p> Signup and view all the answers

    Is this a characteristic of cut-through or store-and-forward? Has low latency.

    <p>cut-through</p> Signup and view all the answers

    Is this a characteristic of cut-through or store-and-forward? May forward runt frames.

    <p>cut-through</p> Signup and view all the answers

    Is this a characteristic of cut-through or store-and-forward? Begins forwarding when the destination address is received.

    <p>cut-through</p> Signup and view all the answers

    The ARP table in a switch maps which two types of addresses together?

    <p>Layer 3 address to a Layer 2 address</p> Signup and view all the answers

    Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)

    <p>Logical link control is implemented in software.</p> Signup and view all the answers

    ARP ____________ is a technique that is used to send fake ARP messages to other hosts in the LAN.

    <p>spoofing</p> Signup and view all the answers

    What happens to runt frames received by a Cisco Ethernet switch?

    <p>The frame is dropped.</p> Signup and view all the answers

    What are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.)

    <p>1518 bytes</p> Signup and view all the answers

    What is auto-MDIX?

    <p>A feature that detects Ethernet cable type</p> Signup and view all the answers

    On a Cisco switch, _____________ memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports.

    <p>port-based</p> Signup and view all the answers

    Which statement describes the treatment of ARP requests on the local link?

    <p>They are received and processed by every device on the local network.</p> Signup and view all the answers

    What statement describes a characteristic of MAC addresses?

    <p>They must be globally unique.</p> Signup and view all the answers

    When a device is sending data to another device on a remote network, the Ethernet frame is sent to the MAC address of the default gateway.

    <p>True</p> Signup and view all the answers

    What are two potential network problems that can result from ARP operation? (Choose two.)

    <p>On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.</p> Signup and view all the answers

    A collision fragment, also known as a _______ frame, is a frame of fewer than 64 bytes in length.

    <p>runt</p> Signup and view all the answers

    Which statement is true about MAC addresses?

    <p>The first three bytes are used by the vendor assigned OUI.</p> Signup and view all the answers

    What addressing information is recorded by a switch to build its MAC address table?

    <p>The source Layer 2 address of incoming frames</p> Signup and view all the answers

    What statement describes Ethernet?

    <p>It defines the most common LAN type in the world.</p> Signup and view all the answers

    Which switching method uses the CRC value in a frame?

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

    When a network device wants to communicate with another device on the same network, it sends a ____________ _____ _________.

    <p>broadcast ARP request</p> Signup and view all the answers

    The destination device of a broadcast ARP request containing the IP in the request, sends an ________ ______ with its MAC address.

    <p>ARP reply</p> Signup and view all the answers

    Ethernet operates in which layer or layers?

    <p>data link layer and the physical layer</p> Signup and view all the answers

    The Ethernet protocol standards define many aspects of network communication including frame format, frame size, timing, and encoding.

    Signup and view all the answers

    The OSI model separates the data link layer functionalities of addressing, framing, and accessing the media from the physical layer standards.

    Signup and view all the answers

    Ethernet is a family of networking technologies that are defined in the IEEE 802.2 and 802.3 standards.

    Signup and view all the answers

    The Ethernet LLC sublayer handles the communication between?

    <p>the upper layers and the lower layers.</p> Signup and view all the answers

    LLC is implemented in __________ , and its implementation is independent of the __________.

    <p>software, hardware</p> Signup and view all the answers

    MAC constitutes the lower sublayer of the data link layer.

    Signup and view all the answers

    Frame delimiting, addressing, and error detection are all examples of?

    <p>Data encapsulation</p> Signup and view all the answers

    Control of frame placement on and off the media and media recovery are both examples of?

    <p>Media access control</p> Signup and view all the answers

    The Ethernet MAC sublayer has two primary responsibilities; what are they?

    <p>Media access control</p> Signup and view all the answers

    The data encapsulation process includes frame assembly ___________ transmission over the media.

    <p>transmission</p> Signup and view all the answers

    Frame dis-assembly happens at the host or source?

    <p>Host</p> Signup and view all the answers

    The framing process provides important delimiters that are used to identify a group of bits that make up a frame. This is known as what term in data encapsulation?

    <p>Frame delimiting</p> Signup and view all the answers

    The encapsulation process contains the Layer 3 PDU and also provides for data link layer addressing. This is known as what term in data encapsulation?

    <p>Addressing</p> Signup and view all the answers

    Each frame contains a trailer used to detect any errors in transmissions. This is known as what term in data encapsulation?

    <p>Error detection</p> Signup and view all the answers

    What data link sublayer is responsible for the placement of frames on the media and the removal of frames from the media?

    <p>Media access control</p> Signup and view all the answers

    A contention-based method means what?

    <p>Any device can try to transmit data across the shared medium whenever it has data to send.</p> Signup and view all the answers

    The latest versions of Ethernet operate at what speed?

    <p>10 Gigabits per second</p> Signup and view all the answers

    The preamble (7 bytes) and start frame delimiter (SFD), also called the start of frame (1 byte), fields are used for synchronization between the sending and receiving devices.

    Signup and view all the answers

    The minimum Ethernet frame size is 64 bytes and the maximum is 1518 bytes. This includes all bytes from the destination MAC address field through the frame check sequence (FCS) field.

    Signup and view all the answers

    Any frame less than 64 bytes in length is considered a collision fragment or runt frame and is automatically discarded by receiving stations.

    Signup and view all the answers

    Ethernet frame field, what is it?

    Signup and view all the answers

    Study Notes

    ARP and MAC Addresses

    • ARP (Address Resolution Protocol) uses the destination address FFFF.FFFF.FFFF in request frames for Layer 2 broadcast on an Ethernet LAN.
    • The ARP table in switches maps Layer 3 addresses (IP) to Layer 2 addresses (MAC).
    • A broadcast ARP request prompts a reply with the destination device's MAC address.

    Ethernet Switching Methods

    • Store-and-forward switching always stores the entire frame and checks the CRC and frame length before forwarding.
    • Cut-through switching has low latency, may forward runt frames, and begins forwarding as soon as the destination address is received.

    Features of LLC and MAC Layers

    • The Logical Link Control (LLC) sublayer facilitates communication between the data link layer and upper layers of the protocol suite; it is implemented in software.
    • MAC (Media Access Control) is implemented by hardware in the NIC and is responsible for addressing, framing, and controlling access to the media.

    Frame Specifications

    • Ethernet frames have a minimum size of 64 bytes and a maximum size of 1518 bytes, excluding the Preamble.
    • Collision fragments or runt frames are under 64 bytes and are automatically discarded by switches.

    Ethernet Characteristics

    • MAC addresses must be globally unique, with the first three bytes assigned as the Organizationally Unique Identifier (OUI).
    • Ethernet defines the most common LAN type in the world and operates at both the data link and physical layers.

    Error Handling and Frame Delimiting

    • Frames include trailers for error detection and utilize frame delimiting for synchronization between nodes.
    • The frame assembly process occurs at the host, while the encapsulation process provides addressing for the data link layer.
    • Network attackers can manipulate MAC and IP mappings leading to interception of traffic.
    • Excessive ARP broadcasts can cause delays in data communication on networks with low bandwidth.

    Auto-MDIX and Memory Buffering

    • Auto-MDIX is a feature that detects the type of Ethernet cable used.
    • Cisco switches use port-based memory buffering to manage frames specific to ports.

    Communication Process

    • When devices on the same network communicate, a broadcast ARP request is sent to resolve IP addresses.
    • Responses and actions taken regarding ARP requests are processed by all devices on the local network.

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    Test your knowledge of Ethernet concepts with flashcards from Chapter 5. This quiz focuses on ARP request frames and their purpose in discovering MAC addresses on an Ethernet LAN. Enhance your understanding of networking fundamentals through this interactive resource.

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