LEC11: Address Resolution on Same Network
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Questions and Answers

What protocol is used by IPv6 to associate an IPv6 address with a MAC address?

  • ICMPv6 (correct)
  • ARP
  • IPv6
  • IP

    • What is the purpose of ARP in an IPv4 network?

  • To map device names to MAC addresses
  • To map IPv4 addresses to MAC addresses (correct)
  • To map MAC addresses to IP addresses
  • To map IP addresses to device names

    • What type of address is contained in the Destination MAC address field of an Ethernet Layer 2 frame?

  • Device name
  • Ethernet MAC address (correct)
  • IPv6 address
  • IPv4 address

    • What is the address of the default gateway in an Ethernet Layer 2 frame?

    <p>MAC address of the router</p> Signup and view all the answers

    What is required to send a packet to another host on the same local IPv4 network?

    <p>Both the IPv4 address and the MAC address of the destination device</p> Signup and view all the answers

    How are device destination IPv4 addresses typically resolved?

    <p>Either known or resolved by device name</p> Signup and view all the answers

    What is the primary function of ARP in an IPv4 network?

    <p>To resolve IPv4 addresses to MAC addresses</p> Signup and view all the answers

    What is the purpose of the Source MAC address field in an Ethernet Layer 2 frame?

    <p>To specify the source device</p> Signup and view all the answers

    What is the primary function of the MAC address in an Ethernet LAN?

    <p>For NIC to NIC communications on the same Ethernet network</p> Signup and view all the answers

    What happens when a router receives an Ethernet frame?

    <p>It de-encapsulates the Layer 2 information</p> Signup and view all the answers

    What is the purpose of ARP in IPv4?

    <p>To associate the IPv4 address with the MAC address of a device</p> Signup and view all the answers

    What is the role of the default gateway in a remote network?

    <p>It is the router interface on a remote network</p> Signup and view all the answers

    What happens when the destination IP address is on the same network?

    <p>The destination MAC address is that of the destination device</p> Signup and view all the answers

    What is the function of Layer 3 addresses in an Ethernet LAN?

    <p>Used to send packets from the source device to the destination device</p> Signup and view all the answers

    What determines the next hop device in a router?

    <p>The destination IPv4 address</p> Signup and view all the answers

    How do routers forward IPv4 packets?

    <p>By determining the next hop device using the destination IPv4 address</p> Signup and view all the answers

    What is the primary function of ARP in resolving IPv4 addresses to MAC addresses?

    <p>To map IPv4 addresses to MAC addresses for packet transmission</p> Signup and view all the answers

    What is the ARP table also known as?

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

    What happens when a device searches its ARP table and finds a matching IPv4 address?

    <p>The device uses the corresponding MAC address as the destination MAC address</p> Signup and view all the answers

    What is the purpose of the ARP table in a device's memory?

    <p>To map IPv4 addresses to MAC addresses</p> Signup and view all the answers

    What happens when a device does not find a matching IPv4 address in its ARP table?

    <p>The device sends an ARP request</p> Signup and view all the answers

    What is the relationship between an IPv4 address and a MAC address in an ARP table entry?

    <p>A one-to-one relationship</p> Signup and view all the answers

    What is the purpose of an ARP request?

    <p>To resolve an unknown IPv4 address to a MAC address</p> Signup and view all the answers

    What is the significance of the ARP table in packet transmission?

    <p>It resolves IPv4 addresses to MAC addresses</p> Signup and view all the answers

    What is the purpose of the ARP table?

    <p>To temporarily cache device mappings for the LAN</p> Signup and view all the answers

    How long do ARP table entries typically remain?

    <p>Until an ARP cache timer expires</p> Signup and view all the answers

    What is the command to display the ARP table on a Cisco router?

    <p>show ip arp</p> Signup and view all the answers

    What is a potential issue with ARP broadcasts?

    <p>They can cause excessive network traffic</p> Signup and view all the answers

    What is ARP spoofing?

    <p>A technique used by a threat actor to reply to an ARP request</p> Signup and view all the answers

    What is the purpose of an ARP request?

    <p>To request the MAC address of a device</p> Signup and view all the answers

    How can ARP table entries be removed?

    <p>When the ARP cache timer expires or manually by the administrator</p> Signup and view all the answers

    What is the command to display the ARP table on a Windows 10 PC?

    <p>arp -a</p> Signup and view all the answers

    What is the purpose of dynamic ARP inspection (DAI) in enterprise-level switches?

    <p>To protect against ARP attacks</p> Signup and view all the answers

    What protocol is used to match IPv6 addresses to MAC addresses?

    <p>IPv6 Neighbor Discovery (ND) protocol</p> Signup and view all the answers

    What type of messages are used for device-to-device messaging for address resolution in IPv6?

    <p>Neighbor Solicitation and Neighbor Advertisement messages</p> Signup and view all the answers

    What is the purpose of ICMPv6 Redirect messages?

    <p>For better next-hop selection</p> Signup and view all the answers

    What is the purpose of ICMPv6 Router Solicitation messages?

    <p>To discover routers</p> Signup and view all the answers

    What is the purpose of ICMPv6 Neighbor Advertisement messages?

    <p>To respond to neighbor solicitation messages</p> Signup and view all the answers

    What is the purpose of IPv6 Neighbor Discovery protocol?

    <p>To match IPv6 addresses to MAC addresses</p> Signup and view all the answers

    What is the consequence of adding a wrong MAC address to the ARP table?

    <p>Packets are sent to the threat actor</p> Signup and view all the answers

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