CCNA1 6 Addressing the Network - IPv4(2)

CCNA1 第六章

Given IPv4 addressing information and design criteria, calculate the appropriate addressing components.

Use common testing utilities to verify and test network

connectivity and operational status of the IP protocol stack on a host.

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6.1 IPv4 Addresses

6.1.1 The Anatomy of an IPv4 Address

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Each device on a network must be uniquely defined. At the Network layer, the packets of the communication need to be identified with the source and destination addresses of the two end systems. With IPv4, this means that each packet has a 32-bit source address and a 32-bit destination address in the Layer 3 header.

These addresses are used in the data network as binary patterns. Inside the devices, digital logic is applied for their interpretation. For us in the human network, a string of 32 bits is difficult to interpret and even more difficult to remember. Therefore, we represent IPv4 addresses using dotted decimal format.

Dotted Decimal

Binary patterns representing IPv4 addresses are expressed as dotted decimals by separating each byte of the binary pattern, called an octet, with a dot. It is called an octet because each decimal number represents one byte or 8 bits.

For example, the address:

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