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Extra info for 640-801 Cisco CCNA Cisco Certified Network Associate (Version 90.0)
25-2 gives us 30. 240 will give us 14 host addresses. However, we must still subtract two addresses (the network address and the broadcast address) to determine the maximum number of hosts the subnet will support. However, we must still subtract two addresses (the network address and the broadcast address) to determine the maximum number of hosts the subnet will support. 192 will give us 62 host addresses. However, we must still subtract two addresses (the network address and the broadcast address) to determine the maximum number of hosts the subnet will support.
We must remember to always subtract 2 (one for the network, and one for the broadcast) so the result is 254, not 256. No possible network mask would give us this exact number of subnets or hosts. This would be true if this were a class C network, not a class B. QUESTION NO: 28 How many usable IP addresses can you get from a conventional Class C address? Using the 2n-2 formula, we can calculate that Class C addresses can support a maximum of 254 (28-2) hosts. We must subtract 2 for the network and broadcast addresses to calculate the number of usable addresses in any subnet.
1/20, what is the maximum number of hosts allowed on this subnet? Each subnet must support at least 24 hosts. Which network mask should you use? This matches with requirement. What should you tell him? 224 subnet mask? com - 55 - next network 0 0 1 1 0 0 0 0 (which equals 48) Range of host values are: RANGE 0 0 1 0 0 0 0 1 TO RANGE 0 0 1 0 1 1 1 0 network is 32 the next network is 32 + 16 = 48 the range is 32 + 1 to 48 - 2. this results in a range 33 to 46. These choices are both network addresses.
640-801 Cisco CCNA Cisco Certified Network Associate (Version 90.0)