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 (C)</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 (C)</p> Signup and view all the answers

How are device destination IPv4 addresses typically resolved?

<p>Either known or resolved by device name (C)</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 (B)</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 (A)</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 (C)</p> Signup and view all the answers

What happens when a router receives an Ethernet frame?

<p>It de-encapsulates the Layer 2 information (A)</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 (A)</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 (B)</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 (B)</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 (C)</p> Signup and view all the answers

What determines the next hop device in a router?

<p>The destination IPv4 address (D)</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 (D)</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 (B)</p> Signup and view all the answers

What is the ARP table also known as?

<p>ARP cache (D)</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 (B)</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 (D)</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 (C)</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 (B)</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 (A)</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 (B)</p> Signup and view all the answers

What is the purpose of the ARP table?

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

How long do ARP table entries typically remain?

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

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

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

What is a potential issue with ARP broadcasts?

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

What is the purpose of an ARP request?

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

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

<p>arp -a (B)</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 (D)</p> Signup and view all the answers

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

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

What is the purpose of ICMPv6 Redirect messages?

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

What is the purpose of ICMPv6 Router Solicitation messages?

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

What is the purpose of ICMPv6 Neighbor Advertisement messages?

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

What is the purpose of IPv6 Neighbor Discovery protocol?

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

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