Address Resolution

The primary purpose of address resolution is to map:

Domain names to IP addresses

IP addresses to physical (MAC) addresses

URLs to web server locations

Port numbers to applications

Which protocol is typically used for address resolution in Ethernet networks?

DNS (Domain Name System)

DHCP (Dynamic Host Configuration Protocol)

ARP (Address Resolution Protocol)

HTTP (Hypertext Transfer Protocol)

What type of address is a MAC address?

Logical address

Public IP address

Private IP address

Hardware address

In address resolution, a device broadcasts a message containing its:

Domain name

IP address

Username and password

Default gateway address

What happens after a device receives an ARP request with its matching IP address?

It ignores the request.

It forwards the request to another device.

It sends a denial message back to the sender.

It sends its MAC address back to the sender in an ARP reply.

What is the main advantage of using ARP caches on devices?

To encrypt communication between devices

To improve address resolution performance by storing recently used mappings.

To increase the available network bandwidth

To provide additional security for the network

What is the difference between static ARP entries and dynamic ARP entries?

Static entries are automatically learned, while dynamic entries require manual configuration.

Static entries are less secure than dynamic entries.

Dynamic entries only work with IPv4 addresses.

Static entries have a shorter lifespan compared to dynamic entries.

What potential security concern exists with ARP spoofing attacks?

They can slow down network performance.

They can be used to intercept network traffic.

They can corrupt data packets during transmission.

They can only be used on wireless networks.

What is a common mitigation strategy against ARP spoofing attacks?

Disabling ARP on all devices on the network

Using static ARP entries for all trusted devices

Increasing the size of ARP caches on devices

Disabling unused network ports on switches

What is the role of Proxy ARP in address resolution?

It allows devices on different subnets to communicate directly.

It translates domain names to IP addresses for web browsing.

It enables a single device to respond to ARP requests on behalf of multiple devices.

It simplifies the process of assigning IP addresses to devices.

What is the primary difference between Gratuitous ARP (GARP) and standard ARP requests?

GARP requests are used to learn the MAC address of a default gateway, while standard ARP is for other devices.

GARP announces a device's presence on the network without requesting a specific MAC address.

GARP uses a different message format compared to standard ARP.

GARP requires manual configuration, while standard ARP is automatic.

How can network switches improve the efficiency of address resolution compared to hubs?

Switches learn and maintain MAC address tables for connected devices, reducing broadcast traffic.

Switches operate at a lower layer of the OSI model, making address resolution faster.

Switches provide higher bandwidth, allowing for faster ARP message transmission.

Switches can translate IP addresses to MAC addresses directly.

What is the role of Reverse Address Resolution Protocol (RARP) in address resolution?

RARP is used to map IP addresses to physical (MAC) addresses, similar to ARP.

RARP is primarily used for dynamic IP address assignment in conjunction with DHCP.

RARP is a more secure alternative to ARP for address resolution.

RARP is not commonly used in modern network implementations.

What are the limitations of using ARP caches for address resolution?

ARP caches are static and require manual configuration.

ARP caches can become outdated if devices change their IP addresses or MAC addresses.

ARP caches are only effective on local area networks (LANs).

ARP caches consume significant processing power on devices.

What is the purpose of using VLAN ARP in switched networks?

VLAN ARP allows devices in different VLANs to communicate directly without a router.

VLAN ARP simplifies the process of managing ARP caches on multiple switches.

VLAN ARP provides an additional layer of security for address resolution within a VLAN.

VLAN ARP is used to reduce the overall network traffic generated by ARP requests.

How can IPv6 address resolution differ from IPv4 address resolution using ARP?

IPv6 uses a different protocol entirely for address resolution.

IPv6 addresses are longer than IPv4 addresses, making ARP messages larger.

IPv6 relies solely on static ARP entries for address resolution.

IPv6 address resolution is not necessary due to the inherent hierarchy of IPv6 addresses.

What is the function of Neighbor Discovery Protocol (NDP) in IPv6 address resolution?

NDP translates domain names to IPv6 addresses.

NDP performs similar functions to ARP for mapping IPv6 addresses to MAC addresses.

NDP simplifies the process of assigning IPv6 addresses to devices.

NDP is used to manage dynamic routing protocols in IPv6 networks.

How can static ARP entries be used for troubleshooting network connectivity issues?

Static ARP entries can be used to bypass faulty network devices.

Analyzing static ARP entries can reveal outdated or incorrect MAC address mappings.

Static ARP entries can be used to increase the size of the ARP cache on a device.

Static ARP entries offer no benefits for troubleshooting network connectivity.

What security considerations should be taken into account when implementing static ARP entries?

Static ARP entries should be configured for all devices on the network.

Using static ARP entries can introduce vulnerabilities if entries are not managed properly.

Static ARP entries automatically expire after a set period, ensuring security.

Static ARP entries are inherently more secure than dynamic ARP entries.

What are some advanced techniques used to improve the security of address resolution protocols?

Implementing stronger encryption algorithms for ARP messages.

Utilizing Secure ARP (S-ARP) for authenticated address resolution.

Increasing the size of ARP caches to store more mappings.

Disabling ARP entirely and relying on manual configuration.

Address Resolution

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