40 Questions
What protocol is used by IPv6 to associate an IPv6 address with a MAC address?
ICMPv6
What is the purpose of ARP in an IPv4 network?
To map IPv4 addresses to MAC addresses
What type of address is contained in the Destination MAC address field of an Ethernet Layer 2 frame?
Ethernet MAC address
What is the address of the default gateway in an Ethernet Layer 2 frame?
MAC address of the router
What is required to send a packet to another host on the same local IPv4 network?
Both the IPv4 address and the MAC address of the destination device
How are device destination IPv4 addresses typically resolved?
Either known or resolved by device name
What is the primary function of ARP in an IPv4 network?
To resolve IPv4 addresses to MAC addresses
What is the purpose of the Source MAC address field in an Ethernet Layer 2 frame?
To specify the source device
What is the primary function of the MAC address in an Ethernet LAN?
For NIC to NIC communications on the same Ethernet network
What happens when a router receives an Ethernet frame?
It de-encapsulates the Layer 2 information
What is the purpose of ARP in IPv4?
To associate the IPv4 address with the MAC address of a device
What is the role of the default gateway in a remote network?
It is the router interface on a remote network
What happens when the destination IP address is on the same network?
The destination MAC address is that of the destination device
What is the function of Layer 3 addresses in an Ethernet LAN?
Used to send packets from the source device to the destination device
What determines the next hop device in a router?
The destination IPv4 address
How do routers forward IPv4 packets?
By determining the next hop device using the destination IPv4 address
What is the primary function of ARP in resolving IPv4 addresses to MAC addresses?
To map IPv4 addresses to MAC addresses for packet transmission
What is the ARP table also known as?
ARP cache
What happens when a device searches its ARP table and finds a matching IPv4 address?
The device uses the corresponding MAC address as the destination MAC address
What is the purpose of the ARP table in a device's memory?
To map IPv4 addresses to MAC addresses
What happens when a device does not find a matching IPv4 address in its ARP table?
The device sends an ARP request
What is the relationship between an IPv4 address and a MAC address in an ARP table entry?
A one-to-one relationship
What is the purpose of an ARP request?
To resolve an unknown IPv4 address to a MAC address
What is the significance of the ARP table in packet transmission?
It resolves IPv4 addresses to MAC addresses
What is the purpose of the ARP table?
To temporarily cache device mappings for the LAN
How long do ARP table entries typically remain?
Until an ARP cache timer expires
What is the command to display the ARP table on a Cisco router?
show ip arp
What is a potential issue with ARP broadcasts?
They can cause excessive network traffic
What is ARP spoofing?
A technique used by a threat actor to reply to an ARP request
What is the purpose of an ARP request?
To request the MAC address of a device
How can ARP table entries be removed?
When the ARP cache timer expires or manually by the administrator
What is the command to display the ARP table on a Windows 10 PC?
arp -a
What is the purpose of dynamic ARP inspection (DAI) in enterprise-level switches?
To protect against ARP attacks
What protocol is used to match IPv6 addresses to MAC addresses?
IPv6 Neighbor Discovery (ND) protocol
What type of messages are used for device-to-device messaging for address resolution in IPv6?
Neighbor Solicitation and Neighbor Advertisement messages
What is the purpose of ICMPv6 Redirect messages?
For better next-hop selection
What is the purpose of ICMPv6 Router Solicitation messages?
To discover routers
What is the purpose of ICMPv6 Neighbor Advertisement messages?
To respond to neighbor solicitation messages
What is the purpose of IPv6 Neighbor Discovery protocol?
To match IPv6 addresses to MAC addresses
What is the consequence of adding a wrong MAC address to the ARP table?
Packets are sent to the threat actor
Learn about Layer 2 and Layer 3 addresses, MAC and IP addresses, and how they are used for communication on the same Ethernet network. Understand the role of MAC and IP addresses in NIC to NIC communication and packet delivery.
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