Podcast
Questions and Answers
What is the primary function of the Address Resolution Protocol (ARP)?
What is the primary function of the Address Resolution Protocol (ARP)?
What does Neighbor Discovery (ND) use to resolve MAC addresses associated with IPv6 addresses?
What does Neighbor Discovery (ND) use to resolve MAC addresses associated with IPv6 addresses?
If an IP address is not found in the ARP table, what action does a device perform?
If an IP address is not found in the ARP table, what action does a device perform?
Which of the following is a benefit of using ARP in a network?
Which of the following is a benefit of using ARP in a network?
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In what scenario can ARP entries become invalid?
In what scenario can ARP entries become invalid?
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What vulnerabilities are associated with ARP?
What vulnerabilities are associated with ARP?
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Which protocol is primarily used for address resolution in IPv6 networks?
Which protocol is primarily used for address resolution in IPv6 networks?
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What happens when a device receives an ARP request?
What happens when a device receives an ARP request?
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What communication method does ND use to send Neighbor Solicitation messages?
What communication method does ND use to send Neighbor Solicitation messages?
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What is the purpose of Router Solicitation and Advertisement messages in Neighbor Discovery?
What is the purpose of Router Solicitation and Advertisement messages in Neighbor Discovery?
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Study Notes
Address Resolution Protocol (ARP) and Neighbor Discovery
- ARP and Neighbor Discovery enable communication on a network by translating logical addresses (IP addresses) to physical addresses (MAC addresses)
- MAC addresses are used for communication between devices on the same Ethernet network.
- IP addresses are used for communication between devices on different networks.
- ARP is used by IPv4 to associate IP addresses with MAC addresses.
- ICMPv6 is used by IPv6 to associate IP addresses with MAC addresses.
- ARP maintains a table (ARP table) that maps IP addresses to MAC addresses.
- If a device needs to send a packet to a device on the same network, it will search its ARP table for the destination IP address to find the corresponding MAC address.
- If the destination IP address is not found in the ARP table, the device sends an ARP request to broadcast on the network, asking for the MAC address associated with the IP address.
- The device with the destination IP address responds with an ARP reply, which includes its MAC address.
- The ARP table entries are not permanent and are removed after a specified period of time. They can also be manually removed by an administrator.
- ARP vulnerabilities include broadcast storms, which can lead to network congestion, and ARP spoofing, where an attacker sends fake ARP replies to redirect traffic and perform an ARP poisoning attack.
- Neighbor Discovery (ND) is used by IPv6.
- ND uses ICMPv6 Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages for address resolution.
- ND also uses ICMPv6 Router Solicitation (RS) and Router Advertisement (RA) messages for router discovery.
- ND uses ICMPv6 Redirect messages for better next-hop route selection.
- To resolve the MAC address for a known IPv6 address, IPv6 devices use ND's NS messages, which are sent using specific Ethernet and IPv6 multicast addresses.
- The device with the destination IPv6 address replies with an NA message, providing its MAC address.
- This information is then used to update the ND cache.
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Description
This quiz covers the essentials of Address Resolution Protocol (ARP) and Neighbor Discovery mechanisms. You'll learn how these protocols facilitate the translation of IP addresses to MAC addresses, ensuring effective communication within and between networks. Test your knowledge on ARP's functionality and its role in Ethernet and IPv6 networks.
