MAC Protocols: Polling and Token Passing
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Questions and Answers

What is the main advantage of random access MAC protocols at low load?

  • They can handle high-load situations efficiently
  • A single node can fully utilize the channel (correct)
  • They are less prone to single point of failure
  • They are suitable for use with 'dumb' slave devices

    • What is the main concern of 'taking turns' MAC protocols?

  • Polling overhead
  • Token overhead
  • Collision overhead
  • Latency and single point of failure (correct)

    • What is the purpose of a MAC address?

  • Used for flow control in LANs
  • Used for error detection and correction
  • Used 'locally' to get a frame from one interface to another physically-connected interface (correct)
  • Used for layer 3 (network layer) forwarding

    • Who administers the allocation of MAC addresses?

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

    What is the advantage of a flat MAC address?

    <p>It is easier to move LAN cards between LANs without changing MAC</p> Signup and view all the answers

    How many bits are typically used to represent a MAC address in most LANs?

    <p>48-bit</p> Signup and view all the answers

    What is the primary purpose of the ARP protocol?

    <p>To resolve IP addresses to MAC addresses</p> Signup and view all the answers

    What is the significance of the TTL value in an ARP table?

    <p>It specifies the time after which the address mapping will be forgotten</p> Signup and view all the answers

    What happens when a device receives an ARP query packet containing its IP address?

    <p>It sends a response packet with its MAC address</p> Signup and view all the answers

    Why is it necessary to have a unique MAC address for each adapter on a LAN?

    <p>To facilitate communication between devices on the same LAN</p> Signup and view all the answers

    What is the purpose of the ARP table in a device?

    <p>To store the IP/MAC address mappings for some LAN nodes</p> Signup and view all the answers

    What happens to the information in the ARP table?

    <p>It times out unless refreshed</p> Signup and view all the answers

    What is the purpose of ARP?

    <p>To resolve IP addresses to MAC addresses</p> Signup and view all the answers

    What is the destination MAC address in the link-layer frame sent from A to R?

    <p>E6-E9-00-17-BB-4B</p> Signup and view all the answers

    What is the source MAC address in the link-layer frame sent from R to B?

    <p>1A-23-F9-CD-06-9B</p> Signup and view all the answers

    Why is Ethernet considered a dominant wired LAN technology?

    <p>It has kept up with the speed race from 10 Mbps to 10 Gbps</p> Signup and view all the answers

    What is the purpose of the Ethernet frame structure?

    <p>To encapsulate IP datagrams in Ethernet frames</p> Signup and view all the answers

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