ccna salary 2020

ccna salary 2020.Certification Objective 6.046.4 Determining the Type of IP AddressFor the CCNA exam, you will probably not encounter questions similar to those presented in the previous section, but you must know how to calculate how many host addresses a subnet has, how many subnets can be created using a specific subnet mask, and determine whether a given IP address is a network address, a host address, or a directed broadcast address. The previous section described how to plan IP addressing, and this section describes how to use some tools to answer these questions, specifically to determine the type of a given address, that is, whether it is a network address, a host address, or a directed broadcast address.As stated in the previous section, each subnet contains three types of addresses: network addresses, directed broadcast addresses, and host addresses. The technique for determining the type of IP address was described in step 4 of the previous section. You need to determine how much the network numbers of adjacent subnets differ. In the exam, you may be given an IP address and a subnet mask; you need to determine the number of network bits based on the dotted decimal subnet mask (for example, in the previous example, the network bits for subnet mask 255.255.255.240 are 28), and subtract this number from 32 (in the previous example, the subtraction results in 4, because the first 28 bits are the network portion and the last 4 bits are the host portion).As mentioned earlier, each subnet contains the same number of addresses. Simply calculate the host bit curtain of 2 to get how many addresses each subnet contains, and thus how much the network numbers of neighboring subnets differ. In the previous example, 24 = 16, which means that each subnet has a total of 16 addresses, including network addresses, host addresses, and directed broadcast addresses. With this information, it is easy to determine the type of address.As you will see, determining the type of address is not difficult, but it does take practice. The next few subsections describe six steps to help determine the type of address.6.4.1 The 6-Step Method for Determining the Type of an IP AddressGiven an address and a subnet mask, you can use the following 6 steps to determine whether the address is a network address, a host address, or a directed broadcast address.1. You need to know the IP address and subnet mask (this is easy)2. Find the relevant byte based on the subnet mask. The relevant byte is the byte where the boundary between the network part and the host part is located, and the possible values of this byte are as follows: 0, 128, 192, 224, 240, 248, 252 and 254. The possible values do not include 255, because if it is 255 (all 8 bits are 1), it means that the byte belongs to the network part. A byte contains the host part only if at least one bit is 0.