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cisco press ccna portable command guide 2nd edition 640 802 phần 2

mà không có sự cho phép bằng văn bản của nhà xuất bản, ngoại trừ sự bao gồm các trích đoạn ngắn gọn xem xét lại. Được in tại Hoa Kỳ của Mỹ Thư viện In ấn đầu tiên năm 2007 tháng bảy của Quốc hội mục-trong-Xuất bản dữ liệu | Binary ANDing 13 Step 2 Perform the AND operation to each pair of bits 1 bit from the address ANDed to the corresponding bit in the subnet mask. Refer to the truth table for the possible outcomes 192.168.100.115 11000000.10101000.01100100.01110011 255.255.255.240 11111111.11111111.11111111.11110000 ANDed result 11000000.10101000.01100100.01110000 Step 3 Convert the answer back into decimal 11000000.10101000.01100100.01110000 192.168.100.112 The IP address 192.168.100.115 belongs to the 192.168.100.112 network when a mask of 255.255.255.240 is used. Question 2 What is the network number of the IP address 192.168.100.115 if it has a subnet mask of 255.255.255.192 Notice that the IP address is the same as in Question 1 but the subnet mask is different. What answer do you think you will get The same one Let s find out Answer Step 1 Convert both the IP address and the subnet mask to binary 192.168.100.115 11000000.10101000.01100100.01110011 255.255.255.192 11111111.11111111.11111111.11000000 Step 2 Perform the AND operation to each pair of bits 1 bit from the address ANDed to the corresponding bit in the subnet mask. Refer to the truth table for the possible outcomes 192.168.100.115 11000000.10101000.01100100.01110011 255.255.255.192 11111111.11111111.11111111.11000000 ANDed result 11000000.10101000.01100100.01000000 Step 3 Convert the answer back into decimal 11000000.10101000.01100100.01110000 192.168.100.64 The IP address 192.168.100.115 belongs to the 192.168.100.64 network when a mask of 255.255.255.192 is used. 14 Binary ANDing So Why AND Good question. The best answer is to save you time when working with IP addressing and subnetting. If you are given an IP address and its subnet you can quickly find out what subnetwork the address belongs to. From here you can determine what other addresses belong to the same subnet. Remember that if two addresses are in the same network or subnetwork they are considered to be local to each other and can therefore communicate .