40 Questions
What is the primary function of the Layer 3 logical address?
Sending packets from the source device to the destination device
What is the role of routers in delivering packets to a remote network?
De-encapsulate the Layer 2 information and encapsulate the IPv4 packet in a new data link frame
What is the protocol used to associate the IPv4 address of a device with the MAC address of the device NIC?
ARP
When a destination IP address is on the same network, what is the destination MAC address?
The MAC address of the destination device
What happens when a device searches the ARP table and cannot find the destination IPv4 address?
The device sends an ARP request
What is the purpose of the ARP table?
To convert IPv4 addresses to MAC addresses
What is the primary function of the Layer 2 physical address?
Delivering frames from one NIC to another NIC on the same network
What is the role of the default gateway in delivering packets to a remote network?
Determining the best path for forwarding the IPv4 packet
When is an ARP request sent?
When there is no ARP table entry
What happens when the device locates the IPv4 address in the ARP table?
The device uses the corresponding MAC address as the destination MAC address
What happens when a router receives the Ethernet frame?
It de-encapsulates the Layer 2 information and determines the next hop device
What is the term used to describe the relationship between an IPv4 address and a MAC address?
map
How are the IP addresses of the IP packets in a data flow associated with the MAC addresses on each link along the path to the destination?
Using the ARP protocol
What is the primary function of ICMPv6 in an IPv6 network?
To associate the IPv6 address of a device with the MAC address of the device NIC
What type of address is used to identify the destination device on another network?
Default gateway address
What is stored temporarily in RAM?
The ARP table or ARP cache
When does a device search the ARP table for the IPv4 address of the default gateway?
When the packet's destination IPv4 address is on a different network
What is the source of the MAC address in an Ethernet Layer 2 frame?
Ethernet NIC on the source host
What is the purpose of ARP in an IPv4 network?
To determine the destination MAC address of a local device
What is an ARP table composed of?
Entries that map IPv4 addresses to MAC addresses
What type of address is used to identify a device on the same local network segment?
MAC address
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
What is the function of the destination MAC address in an Ethernet Layer 2 frame?
To identify the destination device on the same local network segment
What is the relationship between ARP and ICMPv6?
ARP is used for IPv4 networks, while ICMPv6 is used for IPv6 networks
What is the primary purpose of an ARP table?
To temporarily cache the mapping for the devices on the LAN
What is the primary function of the ARP reply in a network?
To match IPv4 addresses to MAC addresses
What is the purpose of the ICMPv6 Neighbor Solicitation message?
To resolve IPv6 addresses to MAC addresses
What is the effect of ARP cache timer expiration?
ARP table entries are removed
What is the main function of the IPv6 Neighbor Discovery protocol?
To match IPv6 addresses to MAC addresses
What is the purpose of the show ip arp command on a Cisco router?
To display the ARP table on the router
What is the purpose of the ICMPv6 Redirect message?
To redirect packets to a better next-hop
What is the purpose of the arp –a command on a Windows 10 PC?
To display the ARP table on the PC
What is the main difference between IPv4 and IPv6 in terms of address resolution?
IPv4 uses ARP, while IPv6 uses ND
What is the consequence of excessive ARP broadcasts?
Some reduction in performance
What is the purpose of the Router Solicitation message?
To facilitate router discovery
What is the purpose of ARP spoofing?
To reply to an ARP request with a fake MAC address
What is the purpose of the Neighbor Advertisement message?
To advertise the device's MAC address
What is the effect of ARP poisoning?
The device's ARP table is updated with the fake MAC address
What is the primary purpose of the dynamic ARP inspection (DAI) technique?
To inspect and protect against ARP attacks
What is the significance of the ARP cache timer duration?
It determines the duration of ARP table entries
Understand the role of MAC and IP addresses in communication on an Ethernet LAN. Learn how Layer 2 and Layer 3 addresses are used to send packets between devices on the same network.
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