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Difference between IP Address and MAC Address
Both MAC Address and IP Address are used to identify a computer on a network or on the Internet. MAC address is provided by the NIC Card's manufacturer and gives the physical address of a computer. IP address is provided by the Internet Service Provider and is called the logical address of a computer connected on a network.
Understanding the distinction between these two addressing schemes is crucial for network administration and troubleshooting.
What is an IP Address?
An IP (Internet Protocol) Address is a unique numerical identifier assigned to every device connected to a network that uses the TCP/IP communication protocols. It serves as the logical address for routing data across networks.
When network devices connect to a network, the Dynamic Host Configuration Protocol (DHCP) server typically allocates IP addresses from a pool of available addresses. While DHCP provides dynamic addresses, many devices use static IP addresses that are permanently assigned to a single entity.
Types of IP Addressing
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Classful IP addressing − A legacy technique that separates IP address pools into five categories: A, B, C, D, and E.
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Classless IP addressing − A modern approach where prefixes can be any length, providing more flexible address allocation.
IP addresses are represented as 32-bit values in IPv4 format using dotted decimal notation. For example, 192.168.1.100 is a valid IP address.
What is a MAC Address?
A MAC (Media Access Control) Address is a unique hardware identifier assigned to network interface cards (NICs). It serves as the physical address of a network device and operates at the Data Link Layer of the OSI model.
MAC addresses are also known as physical addresses, hardware addresses, or burned-in addresses. Unlike IP addresses, MAC addresses are permanent and cannot be changed as they are embedded in the network hardware by the manufacturer.
A MAC address is a 48-bit (6-byte) hexadecimal address, typically displayed as six pairs of hexadecimal digits separated by colons. For example, 50:7B:9D:56:69:21 represents a valid MAC address. The first three bytes identify the manufacturer, while the last three bytes provide a unique identifier for that specific device.
Difference between IP Address and MAC Address
| Aspect | MAC Address | IP Address |
|---|---|---|
| Definition | Physical hardware address that uniquely identifies a network interface | Logical address used to identify devices on a network or internet |
| Size | 48-bit (6 bytes) hexadecimal address | 32-bit (IPv4) or 128-bit (IPv6) address |
| Scope | Local network segment only | Global routing across multiple networks |
| Provider | Network Interface Card manufacturer | Internet Service Provider or network administrator |
| Changeability | Permanent, burned into hardware | Can be changed dynamically or statically assigned |
| Address Resolution | Found using ARP (Address Resolution Protocol) | Found using RARP (Reverse Address Resolution Protocol) |
How They Work Together
IP and MAC addresses work in tandem during network communication. When data travels across networks, routers use IP addresses for routing decisions. However, for the final delivery within a local network segment, the Address Resolution Protocol (ARP) maps IP addresses to MAC addresses, enabling direct hardware-to-hardware communication.
Conclusion
MAC addresses provide permanent physical identification for network hardware, while IP addresses serve as changeable logical identifiers for network routing. Both addressing schemes are essential for modern network communication, working together to ensure data reaches its intended destination across complex network infrastructures.
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