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Question 277 - N10-008 discussion

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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? (Select TWO).

A.
ARP table
Answers
A.
ARP table
B.
DHCP leases
Answers
B.
DHCP leases
C.
IP route table
Answers
C.
IP route table
D.
DNS cache
Answers
D.
DNS cache
E.
MAC address table
Answers
E.
MAC address table
F.
STP topology
Answers
F.
STP topology
Suggested answer: A, B

Explanation:

A MAC address is a unique identifier assigned to a network interface card (NIC) that allows it tocommunicate on a physical network layer, such as Ethernet1.An IP address is a logical identifierassigned to a device that allows it to communicate on a network layer, such as IP2.A technician can use different methods to find the IP address of a device if they know its MACaddress. Two of the most common methods are looking at the ARP table and the DHCP leases.The ARP table is a data structure that stores the mappings between IP addresses and MACaddresses on a device.ARP stands for Address Resolution Protocol, which is a network protocolthat enables devices to discover the MAC address of another device based on its IP address3.The ARP table is populated by sending ARP requests and receiving ARP replies, or byusing static ARP entries that are manually configured4.A technician can look at the ARP table of their own device or a nearby device, such as a routeror a switch, to find the IP address of a device with a known MAC address. For example, on aWindows device, the technician can use the commandarp -ato display the ARP table, and lookfor the entry that matches the MAC address. On a Cisco device, the technician can use thecommandshow ip arpto display the ARP table, and look for the entry that matches the MACaddress.The DHCP leases are the records of the IP addresses that are assigned by a DHCP server toDHCP clients. DHCP stands for Dynamic Host Configuration Protocol, which is a networkprotocol that enables devices to obtain IP addresses and other network configurationparameters automatically from a DHCP server. The DHCP leases contain information such as theIP address, the MAC address, the lease duration, and the expiration time of each DHCP client.A technician can look at the DHCP leases of the DHCP server that serves the network segmentwhere the device with the known MAC address is connected. For example, on a Windows DHCPserver, the technician can use the DHCP console to view the DHCP leases, and look for the entrythat matches the MAC address. On a Cisco DHCP server, the technician can use thecommandshow ip dhcp bindingto view the DHCP leases, and look for the entry that matches theMAC address.The other options are incorrect for the following reasons:C . IP route table is a data structure that stores the routes to different network destinations ona device. It does not store the MAC addresses of the devices on the network.D . DNS cache is a data structure that stores the mappings between domain names and IPaddresses on a device. DNS stands for Domain Name System, which is a network service thattranslates human-readable domain names into IP addresses. It does not store the MACaddresses of the devices on the network.E . MAC address table is a data structure that stores the mappings between MAC addresses andswitch ports on a switch. It does not store the IP addresses of the devices on the network.F . STP topology is a network design that uses the Spanning Tree Protocol (STP) to prevent loopsand create a loop-free logical topology on a switched network. It does not store the IPaddresses or the MAC addresses of the devices on the network.Reference:1: MAC address - Wikipedia2: IP address - Wikipedia

asked 02/10/2024
Joice Lira
30 questions
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