640-801 Cisco CCNA Cisco Certified Network Associate

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Extra resources for 640-801 Cisco CCNA Cisco Certified Network Associate (Version 90.0)

Sample text

Which subnet mask is the most efficient? 252 subnet mask is often used for these types of links, as no IP addresses are wasted.  Which of the masks below would you use? 252 is a /30, so answer B is correct.  It is not possible to use a /38 mask, unless of course IPv6 is being used.  These masks will provide for a larger number of host addresses, and since only 2 IP addresses are needed for a point to point link, these extra addresses are wasted. F: No available host addresses with a /32 mask QUESTION NO: 38 How would you express the binary number: 10101010 in its decimal and hexadecimal forms?

Class A addresses start with 0, as they are addresses that are less than 128.  They are currently reserved for experimental use.  Which of one of the subnet masks below is capable of providing one useful subnet for each of the above departments (support, financial, sales & development) while still allowing enough usable host addresses to meet the needs of each department?  This also leaves us with 5 bits for hosts, which gives us 30 hosts.  Only 1 bit is required to give us 128 but 1 bit gives us 0 subnets.

32/27 network. 192/27 network. 240 Which of the following addresses can be allocated to hosts on the resulting subnet?  How many usable networks and host addresses can be obtained from this?  Since this is a class C network, this subnet can have only 1 network and 254 usable hosts. QUESTION NO: 24 Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?  If these 9 bits are used for the hosts in a class B network, then the remaining 7 bits are used for the number of networks.

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