![]() ![]() I also understand this sub is for people looking to get certified, but I think it does everyone a disfavor to push methods that will make them less likely to be able to troubleshoot real world issues, as that devalues the certification. Why, because I had a better understanding of how everything worked together and had a good fundamental understanding of how routing and IP addressing works. ![]() It can make network and routing troubleshooting a lot easier if you fully understand how everything is related, but, yes, it is harder to learn than tricks to pass the test.Īlmost 20 years ago I figured out a routing problem at a Fortune 100 company as a Level 1 tech that had been through all levels of support multiple times and none of the certified people managed to actually recognize the problem (bad mask on a static route, they kept on changing where the route pointed too) that I did, as a Level 1 tech. My concern is not as much in passing the tests, rather, I would rather have students learn how and why the subnet masks are the way they are and learn about how to find the network boundaries. I was very familiar with binary well before I got into networking, and with my math background subnetting was not hard for me. You're given a class B network address with a mask of /25 (255.255.255.12, you have to work out how many subnets available. The network and broadcast addresses are indicated by either all 1s or all 0s in the host. For the larger numbers I just remember that 2 8 is 256 and work from there. All hosts need a network address and a broadcast address. My BS was in Electrical Engineering, and if I took everything as an undergrad, I would have had a BS in math too. Every time you multiply by 2 you double the previous number, divide by two you have half the previous number. If you have the subnet mask in dotted-decimal notation, it is even easier for /24 and more significant. For example, in a /24 subnet, the number of hosts is calculated below. All opinions stated are those of the poster only, and do not reflect the opinion of Cisco Systems Inc., or its affiliates. The formula for calculating some hosts is mentioned below: 232-networkbit - 2. NOTE: The "Reddit Cisco Ring", its associates, subreddits, and creator "mechman991" are not endorsed, sponsored, or officially associated with Cisco Systems Inc.
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