74.9.34 TO 74.9.63.74.9.34 TO 74.9.63.

204. - MCSE EXAM 70 293 PLANNING AND MAINTAINING A WINDOWS SERVER 2003 NETWORK INFRASTRUCTURE PHẦN 3 PPSX 204. - MCSE EXAM 70 293 PLANNING AND MAINTAINING A WINDOWS SERVER 2003 NETWORK INFRASTRUCTURE PHẦN 3 PPSX 204. - MCSE EXAM 70 293 PLANNING AND MAINTAINING A WINDOWS SERVER 2003 NETWORK INFRASTRUCTURE PHẦN 3 PPSX
MCSE EXAM 70 293 PLANNING AND MAINTAINING A WINDOWS SERVER 2003 NETWORK INFRASTRUCTURE PHẦN 3 PPSX
204.74.9.34 to 204.74.9.63.

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IPIf you want to use the first and last networks in this scenario, you must useClassless Inter-Domain Routing (CIDR) notation and use routing services that sup-port CIDR. In traditional subnetting, the first network ID is all zeros, so it is “thisnetwork,” and the last network ID is all ones, which signifies the broadcast for thatnetwork.

Classless Inter-Domain Routing (CIDR)

You should see now that there are limits to the size of the network you can implementusing classful IP address assignment. It has become necessary to provide more options tocreate larger segments to reduce the size of routing tables and overcome the depleted publicIP address pool.The solution is known as Classless Inter-Domain Routing (CIDR). CIDRuses a binary format to provide the definition of network addresses.Use the matrix in Table 3.10 to quickly identify routing and subnet information basedon your requirements for the number of hosts and networks.The column of binary masksshould help you calculate the networks for each subnet, and the table shows how theclassful addressing scheme relates to the CIDR notation.

Table 3.10

Quick Matrix for Determining Routing and Subnet InformationRequired Hosts per Networks CIDR Binary Mask Subnet (2

n

–2) Subnet Mask256 Class B /8 11111111.00000000.00000000.00000000 16,777,212 255.0.0.0128 Class B /9 11111111.10000000.00000000.00000000 8,388,606 255.128.0.064 Class B /10 11111111.11000000.00000000.00000000 4,194,302 255.192.0.032 Class B /11 11111111.11100000.00000000.00000000 2,097,150 255.224.0.016 Class B /12 11111111.11110000.00000000.00000000 1,048,574 255.240.0.08 Class B /13 11111111.11111000.00000000.00000000 524,286 255.248.0.04 Class B /14 11111111.11111100.00000000.00000000 262,142 255.252.0.02 Class B /15 11111111.11111110.00000000.00000000 131,070 255.254.0.01 Class B /16 11111111.11111111.00000000.00000000 65,534 255.255.0.0256 Class C /16 11111111.11111111.00000000.00000000 65,534 255.255.0.0128 Class C /17 11111111.11111111.10000000.00000000 32,766 255.255.128.0

Continued

64 Class C /18 11111111.11111111.11000000.00000000 16,382 255.255.192.032 Class C /19 11111111.11111111.11100000.00000000 8190 255.255.224.016 Class C /20 11111111.11111111.11110000.00000000 4094 255.255.240.08 Class C /21 11111111.11111111.11111000.00000000 2046 255.255.248.04 Class C /22 11111111.11111111.11111100.00000000 1022 255.255.252.02 Class C /23 11111111.11111111.11111110.00000000 510 255.255.254.01 Class C /24 11111111.11111111.11111111.00000000 254 255.255.255.0