ccna 200-301 network simulator tools for working

ccna 200-301 network simulator tools for working.Chapter 2 Network Interconnection and Reference Models "* 02computers are on the same subnet, and the amount of broadcasts is enormous. By segregating the 60,000+ computers into different subnets through a Layer 3 switch or router, most of the traffic will be restricted to the local subnet, and only that traffic that is marked to be sent to other networks will pass through the network layer of the router or Layer 3 switch. VLANs on routers and Layer 3 switches create broadcast domains. the more broadcast domains that are created. the smaller their broadcast domains will be and the lower the amount of extraneous traffic will be on each network segment.. Simplifying Management . It is much easier to determine and isolate failures that occur on a network in a smaller set of interconnected networks than in a huge network.. Increase network security. Imagine applying for a Class C address 193.1.1.0/24, multiple departments within the company share this Class C address and are in the same broadcast domain as each other. By using hacking tools, it is easy to intercept the communication between other users, which is a great security risk and not easy to implement access control. By dividing the subnet, let the router interconnect different subnets, and configure ACLCAccessControlList on the router to restrict the access between different networks to improve the security of the network.2. How to create a subnet& Example 1: If a unit applies for a Class C network address 199.1.1.0/24, there are 5 departments in the unit, and each department will only have a maximum of 28 computers. To enhance security, a router is used to restrict access between departments to a limited number of computers. What is the appropriate subnet mask to set? What is the range of IP addresses used by each department?Analyze the characteristics of a Class C address, 24 bits for the network and 8 bits for the host, because the network bits are provided by the IP address allocator and are fixed, and the only bits that can be adjusted within the unit are the host bits. If one of the 8-bit host bits is borrowed to extend the network bits, it can only be divided into 2] = 2 subnets (some older systems do not support all "0" and all "1" subnets, i.e., subnet bits are all "0 " and all "1" network numbers. In this case, none of the subnets will be available if the bits are borrowed 1, but newer systems basically do not have this limitation. u Router(config)#ip subnet-zero command can be used in global configuration mode on Cisco routers to make the router support all "0" and all "1 " subnets, and use the uRouter(config)#no ip subnet-zero command to have the router not support all "0" and all "1" subnets. In the CCNA exam, the default is no support for all-"0" and all-"1" subnets without specifically stating whether they are supported, and candidates should pay special attention regarding this point), which does not meet the needs of 5 sectors; borrowing 2 bits allows division into 22 -The network bit has 24 bits, and the network bit has 24 bits. The number of hosts in each subnet is 25.2=30, which is greater than the maximum number of hosts in each department of 28; by borrowing 4 bits, although the number of subnets is satisfied, only 4 bits of hosts are left, and each subnet can only have at most 2 seven 2=14 available IP addresses, and also remove the one occupied by the gateway. The maximum number of computers per subnet is 13, which is less than the maximum of 28 computers per department. Therefore, there is only one correct division method for this example, which is to borrow 3 bits from the host bits as subnet bits, so the network bits become 24+3=27 bits, which is 255.255.255.224 in decimal.In this example, by borrowing 3 bits from the host bits of a Class C address, the network is divided into 8 subnets as follows.101110