Nó là tương đối đơn giản để tạo ra loại hình này; Hình cho thấy bốn dây được sử dụng trong một cáp Ethernet này có thể xem xét một nhiều rủi ro ít, tôi biết, nhưng tôi hứa nó thực sự không phải là khó! Nó giúp ghi nhớ rằng bạn nên luôn luôn xem một đầu ra chạy | 170 Chapter 3 Implement an IP addressing scheme and IP Services FIGURE Solution to VLSM design example 30 Once you figured out the block size needed for each LAN this was actually a pretty simple question all you need to do is look for the right clues and of course know your block sizes. Summarization Summarization also called route aggregation allows routing protocols to advertise many networks as one address. The purpose of this is to reduce the size of routing tables on routers to save memory which also shortens the amount of time it takes for IP to parse the routing table and find the path to a remote network. Figure shows how a summary address would be used in an internetwork. FIGURE Summary address used in an internetwork 8 16 16 16. 16 Summarization is actually somewhat simple because all you really need to have down are the block sizes that we just used in learning subnetting and VLSM design. For example if you wanted to summarize the following networks into one network advertisement you just have to find the block size first then you can easily find your answer through network What s the block size There are exactly 16 Class C networks so this neatly fits into a block size of 16. Okay now that you know the block size you can find the network address and mask used to summarize these networks into one advertisement. The network address used to advertise the summary address is always the first network address in the block in this example . To figure out a summary mask in this same example what mask is used to get a block size of 16 Yes 240 is correct. This 240 would be placed in the third octet the octet where we are summarizing. So the mask would be . Describe the technological requirements for running IPv6 in conjunction with IPv4 171 Here s another example Networks through This is not as clean as the .
