![]() Wooohooo! Bring on more of these!ĭid you have an even easier way to arrive at the answer? Let us know in the comments. ![]() The broadcast address for this subnet is one less than the next subnet of 144, so that is 143. Step 5: We can see that this host lives on the 192.168.1.128 subnet. Lesson 4 introduces the ideas and processes related to finding facts about a subnet namely, the subnet ID, the subnet broadcast address, and the range of addresses usable as host addresses. ![]() This tells me that the subnets increment on 16:ġ92.168.1.16.32.48.64.80.96.112.128.144 This lesson defines and identifies the core concepts of what an IP subnet is and what it means to subnet a network. Step 4: I go four bits deep (from left to right) in the Power of Two chart. Step 3: How many bits of subnetting are used in the fourth octet here? My Power of Two chart tells me. You also need to memorize these, and again, many students like to list these on scratch paper as well. The default subnet mask for the Class C space is 255.255.255.0. I memorized these number ranges some students like to list those on the scratch paper as well. Step 2: 192 in the first octet tells me I have a Class C address. Step 1: Since the is the first subnetting question I have encountered in my exam, I am going to use this as my opportunity to build my Powers of Two reference chart on my scratch paper.Ģ^7=128 | 2^6=64 | 2^5=32 | 2^4=16 | 2^3=8 | 2^2-=4 | 2 ^1=2 | 2^0=1 Question 1: What is the last usable address in the subnet of a host with the address 192.168.1.134 and the subnet mask of 255.255.255.240? It is an opportunity to solve questions quickly and be 100% convinced that your response is "spot on". Subnetting a subnet, or using VLSM, was designed to avoid wasting addresses. You will find that once you "turn the corner" on subnetting, you will pray for many of these questions in the exam. Cisco Confidential Chapter 9: Summary In this chapter, you learned that: Subnetting is the process of segmenting a network, by dividing it into multiple smaller network spaces. Well, with all that out of the way - let's have some fun. It is a common issue for Cisco candidates to move directly to subnetting shortcuts for the exams without fully understanding exactly how subnetting functions.įor this series of posts, we will use simulated exam questions from ICND1 and ICND2. WARNING: You must master subnetting using our course or some other trusted materials before you start using these shortcut approaches. The ability to do this is often the difference between a passing score and a failed attempt. Randy wanted some guidance on how to solve the subnetting questions in ICND1 and ICND2 very quickly. Thanks to Randy of our CCNA program for this suggestion.
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