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Chapter 4: ipv4 and ipv6 Addressing


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Chapter 4: IPv4 and IPv6 Addressing


1. How many bits make up IPv4 and IPv6 addresses?

The IPv4 address is made up of 32 bits (4 bytes). The IPv6 address is 128 bits (16 bytes).

2. What special address formats make up the IPv4 network itself and directed broadcast (all hosts on the subnet) addresses?

The network itself in IPv4 is indicated by a non-zero network address and an all-zero host address portion (for example, 192.168.64.0/18). The directed broadcast address for a subnet is indicated by a non-zero network address and an all-1s host address portion (for example, 192.168.127.255/18 is the directed broadcast for 192.168.64.0/18 – the third and fourth bytes of 01000000 00000000 become 01111111 11111111). See Table 4-1.

3. How many hosts can be configured with an IPv4 network mask of 255.255.255.240?

You can configure 14 hosts with a network mask of 255.255.255.240. See Table 4-5.

4. What are the differences in format and use between IPv6 link-local and private ULA-local addresses?

The IPv6 link-local addresses used on this network are in the form FE80::/10 (11111110 10). All IPv6 private ULA addresses are in the form FC00::/7.



5. How many “double colons” (“::”) can appear in an IPv6 address?

To avoid confusion, the double colons can only appear once in an IPv6 address.


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