Table of Contents [hide]
- 1 What happens when a device does not know the MAC address of an IP its trying to communication with?
- 2 What happens to a MAC address and to an IP address of a device when that device is moved from one network to another network?
- 3 How devices get their MAC address?
- 4 What role does a router play on a network?
- 5 Can two devices have the same MAC address?
- 6 How does IP address differ from MAC address?
- 7 How to get the MAC address of the attached device?
- 8 How does the switch learn the MAC address of a server?
What happens when a device does not know the MAC address of an IP its trying to communication with?
If the IP address you are trying to talk to is listed in the table, the router immediately forwards your traffic to the destination. If your router doesn’t know the MAC address, it asks all the devices on the network. That’s called a broadcast ARP message.
What would router do if it did not have the MAC address of the destination host in its ARP table?
What happens when a network device does not find a MAC address that matches the IP address in its ARP table? A host will compare a destination IP address to it’s own IP address and mask and will only send an ARP request if there is a match and the destination IP is on the same segment.
What happens to a MAC address and to an IP address of a device when that device is moved from one network to another network?
Internet routers move the packets from the source network to the destination network and then to the LAN on which the destination device is connected. That local network translates the IP address to a MAC address, adds the MAC address to the data stream and sends the data to the right device.
Why do we need a MAC address when we have IP address?
So again, IP Addresses are logical and routeable addresses. And that’s why computers have both MAC Addresses and IP Addresses. MAC Addresses handle the physical connection from computer to computer while IP Addresses handle the logical routeable connection from both computer to computer AND network to network.
How devices get their MAC address?
A MAC address is given to a network adapter when it is manufactured. It is hardwired or hard-coded onto your computer’s network interface card (NIC) and is unique to it. Something called the ARP (Address Resolution Protocol) translates an IP address into a MAC address.
What happens if the local network devices do not have local ARP cache?
What would happen if the local network devices do not have local ARP cache? The broadcast will increase dramatically depending on the size of the network. Broadcasts leads to network degradation. Also, every network device will have to process more broadcast messages and that takes up CPU process.
What role does a router play on a network?
A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet.
Can a device change its MAC address?
The MAC address that is hard-coded on a network interface controller (NIC) cannot be changed. However, many drivers allow the MAC address to be changed. The process of masking a MAC address is known as MAC spoofing.
Can two devices have the same MAC address?
Originally Answered: Can 2 devices have the same MAC address? Yes, it can and does happen. For example, often virtual machines are created with partially random MAC addresses, and sometimes two virtual machines on different hosts will end up with the same MAC address.
How a new device on a network gets its IP address?
Your IP address is assigned to your device by your ISP. Your internet activity goes through the ISP, and they route it back to you, using your IP address. Since they are giving you access to the internet, it is their role to assign an IP address to your device.
How does IP address differ from MAC address?
The main difference between MAC and IP address is that MAC Address is used to ensure the physical address of the computer. It uniquely identifies the devices on a network. While IP addresses are used to uniquely identifies the connection of the network with that device takes part in a network.
How to find MAC address from IP address?
If you want find IP from MAC do this. $ arp -n | grep -w -i ‘YOUR-MAC’ | awk ‘ {print $1}’. Note you must replace YOUR-MAC, with your mac address, keep single quotes. Now, if you want find MAC Address from some IP Try this: $ arp -n | grep -w -i ‘YOUR-IP’ | awk ‘ {print $3}’. Enjoy!
How to get the MAC address of the attached device?
To learn a MAC address on the port the attached device has to speak and to be understood by the switch port. Another possible situation is given by wake on lan the connected device is powered but it does not show activity so no MAC is learned on the port. 05-24-2012 07:59 PM 05-24-2012 07:59 PM
Why doesn’t my Switch port have a MAC address on it?
L2 information for the port looks like fine. To learn a MAC address on the port the attached device has to speak and to be understood by the switch port. Another possible situation is given by wake on lan the connected device is powered but it does not show activity so no MAC is learned on the port.
How does the switch learn the MAC address of a server?
02-17-2009 08:16 AM 02-17-2009 08:16 AM the switch is learning the MAC address from frames received on the port. And there is 5 minutes age timer. So if your server was not sending any frame within last 5 minutes, you will not see any MAC address on the port.