IPv4 and IPv6 Address Resolution Quiz
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Questions and Answers

What command can be used on a Cisco router to display the ARP table?

  • display arp table
  • view ip arp entries
  • show arp cache
  • show ip arp (correct)

Which command in Windows displays ARP information?

  • arp -a (correct)
  • netstat -arp
  • show arp
  • ipconfig /arp

What can excessive ARP broadcasts cause in a network?

  • Decreased network congestion
  • Improved network performance
  • Network congestion (correct)
  • Increased bandwidth usage

Which of the following is a potential vulnerability related to ARP?

<p>ARP poisoning attacks (B)</p> Signup and view all the answers

What is typically a method to mitigate ARP attacks in enterprise-level switches?

<p>Using port security features (D)</p> Signup and view all the answers

What is ARP spoofing primarily used for by threat actors?

<p>Gaining unauthorized access to the network (C)</p> Signup and view all the answers

Which devices are capable of sending and processing ARP requests?

<p>All devices on the local network (D)</p> Signup and view all the answers

How can ARP entries be removed from the cache?

<p>After a specified period of time (B)</p> Signup and view all the answers

What is the main purpose of the Address Resolution Protocol (ARP) in IPv4?

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

Which of the following correctly describes the roles of MAC and IP addresses?

<p>MAC addresses operate at layer two, while IP addresses operate at layer three (C)</p> Signup and view all the answers

In IPv6, what is the role of ICMPv6?

<p>To associate IPv6 addresses with MAC addresses (A)</p> Signup and view all the answers

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

<p>The destination MAC address will be that of the destination device (A)</p> Signup and view all the answers

What type of address do MAC addresses represent?

<p>Layer two physical address (D)</p> Signup and view all the answers

Which statement is true regarding communication across multiple networks?

<p>IP addresses are essential for identifying remote devices (A)</p> Signup and view all the answers

When the destination IP address points to a remote network, which MAC address is used?

<p>The MAC address of the router or default gateway (B)</p> Signup and view all the answers

What is the significance of understanding the difference between MAC and IP addresses?

<p>It helps in troubleshooting and network design (B)</p> Signup and view all the answers

What is the primary function of ICMPv6 neighbor advertisement messages in relation to IP addresses?

<p>To connect an IP address to a MAC address (B)</p> Signup and view all the answers

How does a device determine the MAC address of a local device when the destination IP is known in IPv4?

<p>By utilizing the ARP protocol (C)</p> Signup and view all the answers

What does the ARP cache timer do in relation to the ARP table?

<p>Removes unused entries after a set period (B)</p> Signup and view all the answers

What differentiates the destination MAC address when the destination IP is on a remote network?

<p>It will be the MAC address of the default gateway (D)</p> Signup and view all the answers

Which of the following best describes how IPv6 differs from IPv4 with regard to address resolution?

<p>IPv6 does not utilize ARP for address resolution. (C)</p> Signup and view all the answers

What is the role of Ethernet MAC addresses in data transmission?

<p>To facilitate data delivery between network cards (B)</p> Signup and view all the answers

What is the main function of the ARP protocol in IPv4 networks?

<p>To resolve IPv4 addresses to their corresponding MAC addresses (B)</p> Signup and view all the answers

Which aspect of IPv4 does NOT apply to IPv6 in terms of neighbor discovery?

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

What is the primary function of an ARP table in relation to IPv4 addresses?

<p>To maintain a mapping of IPv4 addresses to MAC addresses (B)</p> Signup and view all the answers

When will a device search for the IP address of the default gateway in its ARP table?

<p>When the destination IPv4 address is on a different network (A)</p> Signup and view all the answers

What does the device utilize to determine the destination MAC address using an IPv4 address?

<p>Address Resolution Protocol (ARP) (A)</p> Signup and view all the answers

Which process in IPv6 replaces the function of ARP used in IPv4?

<p>ICMPv6 (D)</p> Signup and view all the answers

What happens if a device can't find the destination IPv4 address in its ARP table?

<p>The device will consult the default gateway's ARP entry (A)</p> Signup and view all the answers

What does 'mapping' in the context of ARP imply?

<p>Associating IPv4 addresses with specific MAC addresses (A)</p> Signup and view all the answers

Which of the following correctly describes the ARP table structure?

<p>It includes both IPv4 addresses and their corresponding MAC addresses (A)</p> Signup and view all the answers

In what scenario would a device consult its ARP table for an IPv4 address?

<p>When it requires the MAC address for local network communication (C)</p> Signup and view all the answers

What is the purpose of sending an ARP request if no entry is found in the ARP table?

<p>To update the association of IP and MAC addresses (B)</p> Signup and view all the answers

How does an ARP request relate to the ARP table?

<p>It updates the ARP table with IP and MAC address association (A)</p> Signup and view all the answers

What happens to entries in the ARP table over time?

<p>They are removed when the cache timer expires (C)</p> Signup and view all the answers

What is the primary function of ICMP v6 neighbor solicitation messages?

<p>To resolve MAC addresses of known IPv6 addresses (B)</p> Signup and view all the answers

What does the ARP table cache timer do?

<p>Clears unused entries after a specified period (B)</p> Signup and view all the answers

Which messages are used for router discovery in IPv6 Neighbor Discovery?

<p>Router advertisement messages (A), Router solicitation messages (D)</p> Signup and view all the answers

Which factor differentiates the ARP table cache timer between devices?

<p>The operating system on which the device runs (D)</p> Signup and view all the answers

What type of addresses are used in ICMP v6 neighbor solicitation messages?

<p>Multicast addresses (D)</p> Signup and view all the answers

Where can students find a video that explains ARP requests in more detail?

<p>On Cisco NetAcad website or YouTube channel (C)</p> Signup and view all the answers

In what scenario would an IPv6 device use a neighbor advertisement message?

<p>To acknowledge the receipt of a neighbor solicitation message (B)</p> Signup and view all the answers

What should students do if they don’t have access to Cisco NetAcad?

<p>Watch the links provided for video copies (C)</p> Signup and view all the answers

What does the neighbor discovery protocol not provide?

<p>Data encryption (D)</p> Signup and view all the answers

Which of the following statements about the ARP operation is correct?

<p>It updates IP-MAC associations via replies (C)</p> Signup and view all the answers

Which of the following best describes the relationship between NS and NA messages?

<p>NS messages are sent to request MAC addresses, while NA messages are sent in response with the MAC address. (C)</p> Signup and view all the answers

What role does ICMP v6 play in IPv6 Neighbor Discovery?

<p>It facilitates address resolution and router communication. (D)</p> Signup and view all the answers

How does an IPv6 device respond to a neighbor solicitation request?

<p>By sending back its MAC address via a neighbor advertisement (B)</p> Signup and view all the answers

Flashcards

MAC Address

The unique physical address assigned to a network interface card (NIC). Used for communication between devices on the same Ethernet network.

IP Address

The logical address used to identify devices on a network. Can be used for communication across multiple networks.

ARP (Address Resolution Protocol)

A protocol used by IPv4 to associate an IP address with a MAC address on a device. This helps devices on the same network find each other.

Neighbor Discovery (ND)

A protocol used by IPv6 to associate an IPv6 address with a MAC address on a device. Similar to ARP, but for IPv6.

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Default Gateway

A device that acts as a gateway between a local network and other networks. It forwards packets to other networks based on their destination IP addresses.

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Address Resolution

The process of translating between IP addresses and MAC addresses. It is used to determine the MAC address of a device based on its known IP address.

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Remote Network

Used to send packets to a remote network. The destination MAC address is the MAC address of the default gateway.

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Local Network

The address of a device on a local network. The destination MAC address is the MAC address of the destination device.

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ARP Table

A table maintained by ARP that maps IPv4 addresses to their corresponding MAC addresses.

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ARP Resolution

The process of resolving an IPv4 address to a MAC address.

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ARP and Default Gateway

The default gateway's IPv4 address is used when the destination device is on a different network.

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ARP and Destination Address

A network device will search its ARP table for the MAC address associated with the destination IPv4 address.

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MAC Address Association in IPv6

IPv6 uses ICMPv6 to associate MAC addresses with network interface cards.

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ARP and Same Network

The destination network is the same as the source network.

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ARP and Different Network

The destination network is different from the source network.

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ARP Request

A process where a device sends out a broadcast message to discover the MAC address of a device with a specific IP address.

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ARP Reply

A response to an ARP request, containing the MAC address of the device with the requested IP address.

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ARP Spoofing

An attack where a malicious actor sends fake ARP replies to trick devices into thinking they are a legitimate device with a specific IP address.

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ARP Broadcast Vulnerability

A security vulnerability that exploits ARP's broadcast nature, potentially leading to network congestion as devices send and receive unnecessary broadcasts.

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ARP Mitigation Techniques

A technique used by enterprise-level switches to prevent ARP attacks by verifying ARP replies and blocking suspicious requests.

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Neighbor Discovery

The process of finding the MAC address of a device in a network using the IPv6 protocol.

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Neighbor Discovery Cache

A table that stores the mapping of IPv6 addresses to MAC addresses in an IPv6 network.

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Address Resolution Protocol (ARP)

A protocol used to map IPv4 addresses to MAC addresses, allowing devices on the same network to communicate.

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ARP Cache Timer

A timer that removes entries from the ARP cache that have not been used for a specific period of time.

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IPv6 and ARP

IPv6 does not use ARP to resolve addresses because it has a different mechanism called Neighbor Discovery.

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ARP Operation

The process of automatically updating the ARP table with the latest information about devices on the network.

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Removing Entries from the ARP Table

The process of removing entries from the ARP table to ensure that outdated information is not used.

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Updating the ARP Table

The process of updating the ARP table when a device's MAC address changes.

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ARP Role in Network Communications

A mechanism that allows devices on a network to communicate with each other. It allows devices to send and receive data using their IP addresses, even if their MAC addresses are not known.

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IPv6 Neighbor Discovery Protocol

The IPv6 Neighbor Discovery protocol provides services including address resolution, router discovery, and redirection.

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ICMPv6 Neighbor Solicitation (NS)

A special type of ICMPv6 message used to request the MAC address of a device with a known IPv6 address.

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ICMPv6 Neighbor Advertisement (NA)

An ICMPv6 message sent in response to a Neighbor Solicitation, containing the MAC address of the device with the requested IPv6 address.

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Router Discovery

A method used by IPv6 devices to discover and communicate with routers on the network.

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Redirection

A process used by IPv6 devices to redirect traffic to a different router based on specific conditions, such as network congestion.

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ICMPv6 Router Advertisement (RA)

A type of ICMPv6 message used by routers to announce their presence and capabilities to other network devices.

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ICMPv6 Router Solicitation (RS)

A type of ICMPv6 message used by devices to find routers and learn about their capabilities.

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Study Notes

IPv4 and IPv6 Address Resolution

  • Address Resolution Protocol (ARP) maps IPv4 addresses to Media Access Control (MAC) addresses
  • Neighbor Discovery Protocol (NDP) maps IPv6 addresses to MAC addresses
  • Layer 2 (MAC) addresses used for communication between network interface cards (NICs) on the same local area network (LAN)
  • Layer 3 (IP) addresses used for communication across different networks
  • If destination IP is on the same network, the destination MAC address is the destination device's MAC address
  • If destination IP is on a remote network, the destination MAC address is the default gateway's MAC address

ARP Operation

  • Device searches its ARP table for the destination IPv4 address
  • If found, the corresponding MAC address is used as the destination MAC address
  • If not found, the device sends an ARP request
  • The request, used to update ARP table, allows devices to associate IP addresses with device MAC addresses
  • ARP request received by destination device
  • Device responds with its MAC address in an ARP reply

IPv6 Neighbor Discovery

  • Used for address resolution in IPv6 networks
  • Uses ICMPv6 messages (neighbor solicitation and neighbor advertisement) for address resolution
  • Devices in IPv6 networks use NDP to discover MAC addresses associated with known IPv6 addresses
  • Neighbor Solicitation is used to resolve IPv6 addresses to a MAC address, while also discovering available routers on a network
  • Neighbor Advertisement is used to provide the ICMPv6 reply to the Neighbor Solicitation
  • Device receives the neighbor advertisement message and updates its table with the corresponding MAC Address

ARP Table Management

  • Entries in the ARP table are not permanent and are removed after a specific or random time period
  • Cisco devices use a timer to remove entries from the ARP table
  • Administrators can manually remove entries from the ARP table

Using Show Commands

  • Use show ip arp command on Cisco devices to display the ARP table
  • Use arp -a command on Windows devices to display the ARP table

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Related Documents

Module 9 - Cisco Networking Lecture Transcript PDF

Description

Test your knowledge on Address Resolution Protocol (ARP) and Neighbor Discovery Protocol (NDP) used for mapping IP addresses to MAC addresses. This quiz includes key concepts related to layer 2 and layer 3 addressing within LANs and across different networks. Challenge yourself to understand how devices locate MAC addresses for both local and remote communications!

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