CCNA1 6 Addressing the Network - IPv4(21)

CCNA1 第六章

223.255.255.255 that could be used for IPv4 hosts. However, within this range are many addresses that are already reserved for special purposes. Although we have previously covered some of these addresses, the major reserved addresses are discussed in the next section. Display Media Text Transcript | Display Visual Media

6.2.5 Public and Private Addresses

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Although most IPv4 host addresses are public addresses designated for use in networks that are accessible on the Internet, there are blocks of addresses that are used in networks that require limited or no Internet access. These addresses are called private addresses.

Private Addresses

The private address blocks are:

10.0.0.0 to 10.255.255.255 (10.0.0.0 /8)

172.16.0.0 to 172.31.255.255 (172.16.0.0 /12)

192.168.0.0 to 192.168.255.255 (192.168.0.0 /16)

Private space address blocks, as shown in the figure, are set aside for use in private networks. The use of these addresses need not be unique among outside networks. Hosts that do not require access to the Internet at large may make unrestricted use of private addresses. However, the internal networks still must design network address schemes to ensure that the hosts in the private networks use IP addresses that are unique within their networking environment.

Many hosts in different networks may use the same private space addresses. Packets using these addresses as the source or destination should not

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