A technician knows the MAC address of a device and is attempting to find the device's IP address. Which of the following should the technician look at to find the IP address? (Choose two.)
GPT says the technician can look at the following options to find the IP address of a device when the MAC address is known:
A. ARP table: The ARP (Address Resolution Protocol) table maps MAC addresses to IP addresses on a local network segment. If the device has communicated on the network recently, its MAC address and corresponding IP address should be in the ARP table of a device in the same local network segment.
B. DHCP leases: The DHCP (Dynamic Host Configuration Protocol) server assigns IP addresses to devices on the network. If the device obtained its IP address through DHCP, the DHCP server's lease information will associate the MAC address with the assigned IP address. This is useful for devices that use dynamic IP assignment.
A. ARP Table (Address Resolution Protocol): The ARP table maps IP addresses to MAC addresses within a local network segment. When a device wants to communicate with another device on the same network, it uses ARP to resolve the IP address to the corresponding MAC address. The technician can look at the ARP table to find the IP address associated with the known MAC address.
B. DHCP Leases (Dynamic Host Configuration Protocol): DHCP is used to automatically assign IP addresses to devices on a network. DHCP servers maintain a list of leased IP addresses and the corresponding MAC addresses of devices. By checking the DHCP leases, the technician can determine the IP address that was assigned to the device with the known MAC address.
The other options are not directly related to mapping MAC addresses to IP addresses:
ARP table is not the answer because Address Resolution Protocol (ARP) is the method for finding a host's Link Layer (MAC) address when only its IP address is known. The ARP table is used to maintain a correlation between each MAC address and its corresponding IP address. The ARP table can be manually entered by the user.
Incorrect. The ARP table lists IP addresses and their associated MAC addresses because it is the table that the device uses for Layer 2 communication (Layer 2 communication requires MAC addresses). Thus, the answer is ARP table and DHCP leases.
To view DHCP leases in Windows, you can use the following command in the Command Prompt:
python
Copy code
ipconfig /all
This will display the DHCP lease information for all network adapters on the system. Look for the "DHCP Lease Obtained" and "DHCP Server" entries under each adapter.
To view the ARP table in Windows, you can use the following command in the Command Prompt:
css
Copy code
arp -a
This will display the current ARP entries for the system, including the mapping of IP addresses to their corresponding MAC addresses.
MAC Address Table: This table is used in switches to associate MAC addresses with the corresponding switch ports. It helps with forwarding Ethernet frames within a local network but doesn't provide IP addresses.
F. STP Topology (Spanning Tree Protocol): STP is a protocol used to prevent loops in Ethernet networks. It's not used to map MAC addresses to IP addresses.
MAC address tables associate destination MAC addresses with the switch interfaces that they are connected to. Remember that a switch is a layer 2 device, which has nothing to do with routing (IP addresses).
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