MAC 란 무엇입니까?

What is MAC?

MAC, or Media Access Control, is a unique identifier assigned to network interface controllers (NICs) for use as a network address in communications within a network segment. Essentially, it's a way for devices on a network to identify each other and communicate.

How does MAC work?

When data is sent over a network, it's broken up into packets that are transmitted individually. Each packet contains both the sender's and receiver's MAC addresses so that they can be properly directed. When the packet reaches its destination, the receiving device checks the destination MAC address to determine if it was intended for it.

What's the difference between MAC and IP addresses?

While both MAC and IP addresses are used for communication on a network, they serve different purposes. A MAC address is assigned by the manufacturer of a NIC and identifies the hardware itself, while an IP address is assigned by software and identifies where data should be sent.

Can I change my device's MAC address?

Yes, it is possible to change your device's MAC address using software or hardware tools. However, this can sometimes cause issues with connectivity or security protocols on certain networks.

Why would I want to change my MAC address?

There are several reasons why someone might want to change their device's MAC address. One common reason is for privacy concerns - by changing your MAC address, you can make it more difficult for websites or other entities to track your online activity.

What happens if two devices have the same MAC address?

If two devices on the same network have the same MAC address (known as a "collision"), it can cause communication errors or even bring down the entire network segment.

How does ARP relate to MAC addresses?

ARP (Address Resolution Protocol) is used by devices on a network to map IP addresses to corresponding MAC addresses so that data can be properly transmitted between them.

Can I block certain MAC addresses from accessing my network?

Yes, many routers allow you to set up access control lists (ACLs) that specify which devices are allowed or denied access based on their respective MAC addresses.

Are there any security risks associated with using MAC filtering on my network?

While filtering based on known-good or known-bad devices can help secure a wireless LAN deployment from intruders looking for open networks and/or rogue access points; however malicious attackers may spoof their own media access control (MAC) address in order to get past these filters thereby gaining unauthorized access.

What happens if someone else knows my device's MAC address?

Knowing someone else's device's Media Access Control (MAC) Address alone doesn't necessarily pose an immediate threat. However, combining knowledge of one’s Media Access Control (MAC) Address with other information such as location data could potentially reveal sensitive information about individuals such as their daily routines etc. could be used maliciously.

Can two devices have the same MAC address?

No, every NIC is assigned a unique MAC address by the manufacturer. While it's technically possible for two devices to have the same MAC address due to an error in manufacturing, this is extremely rare.

What's the difference between a unicast and multicast MAC address?

A unicast MAC address is used to send data to a specific device on the network, while a multicast MAC address is used to send data to multiple devices at once.

How does MAC filtering improve network security?

By setting up access control lists (ACLs) based on known-good or known-bad devices' respective Media Access Control (MAC) Addresses can help secure wireless LAN deployments from intruders looking for open networks and/or rogue access points thus preventing unauthorized access.

Can someone use my device's MAC address to hack into my computer?

No, simply knowing someone else's device's Media Access Control (MAC) Address alone doesn't give them any special access or privileges on your computer or network.

Can I tell what type of device has a particular MAC address?

In most cases, no - while certain ranges of Media Access Control (MAC) Addresses may be reserved for specific types of devices (e.g., routers), there's no foolproof way to determine what type of device has a given Media Access Control (MAC) Address without additional information.

How do I find my device's MAC address?

The process for finding your device's Media Access Control (MAC) Address varies depending on the operating system and hardware in question - but generally speaking, you can find it in your device settings or by using command prompt utilities such as ipconfig /all (Windows) or ifconfig (Linux).

Can I spoof my own device's MAC address?

Yes, it is possible to spoof your own Media Access Control (MAC) Address using software tools or commands within an operating system. However, doing so can sometimes cause issues with connectivity or security protocols on certain networks.

What happens if a packet is sent with an incorrect destination MAC address?

If a packet is sent with an incorrect destination Media Access Control (MAC) Address that doesn't match any devices on the network segment, it will typically be discarded by all devices except for those running in promiscuous mode which captures all traffic including traffic that was not intended for them thereby raising security concerns.

What are some common uses of Media Access Control (MAC) addresses outside of networking?

Media Access Control (MAC) Addresses are also used in other contexts such as identifying Bluetooth-enabled devices in close proximity, providing unique identifiers for video game controllers, and even tracking stolen mobile phones through their registered IMEI numbers which include their unique media access control addresses.

Can I use MAC addresses to track someone's location?

While it's technically possible to use Media Access Control (MAC) Addresses in conjunction with other data sources (such as GPS or Wi-Fi signal strength) to estimate someone's location, this is generally not reliable enough for precise tracking purposes.

How do Virtual LANs (VLANs) relate to MAC addresses?

VLANs are a way of logically separating different parts of a network into distinct subnetworks - and one way this is accomplished is by assigning each VLAN its own range of Media Access Control (MAC) Addresses.

Can I change my device's MAC address permanently?

Yes, it is possible to permanently change your device's Media Access Control (MAC) Address using hardware modifications such as flashing your NIC with custom firmware; however, this can sometimes void warranties or cause other issues with your device.