vlsm subnetting

, therefore, in a class environment, the subnet mask must be consistent! This reminds me of the novel "monkey claw" and the movie "Pet cemetery" (also known as "knocking at night") based on Stephen King's novel ). You want to get some compensation for the loss, but your price is more! Why is it so complicated? In the age of class IP, "IP" implies a lot of hidden information, and the information is highly independent! You can get a lot of things from the class... This is not God's way. 1. 2. clas

Summary: Class A, B, C is actually the concept of address block, the so-called application of a class C address, refers to the application of a Class C address block. C class Address block of specific IP address of this class C address block, of course, also belong to Class C address classes. A subnet mask is a subnet, such as a number of 200多万个 address blocks that divide the entire IP address into Class A, class B, and C. Identifies each subnet block. The subnet masks are divided into standard

There are class addressing and no-class addressingSubnets and can be turned into subnet masks (VLSM)Sub-grid: If the Class B is divided into Class C, Class A is divided into Class B, the address of the class addressing is mesh into a subnet where all masks are consistent. The address space is the same size.Variable eldest son netmask: The size of the divided address space is inconsistent, and a network number can have a different mask.

172.16.20.223 5, respectively. valid host range: the host address of the first subnet is 172.16.0.33 to 172.16.0.62; the last one is 172.16.0000193 to 172.16.0000222 Variable Length subnet masks (vlsm)Three main network addresses We know that different types of networks vary greatly from LAN to Wan and must be treated differently. Therefore, according to the network size, the network address is divided into three main types: Class A: 0 1 2 3 8 16 24

, the network number is not many. Previously learned IP address can provide Class A network 126, Class B network about 1600, C class network about 2 million, so with the rapid development of the Internet, access to the Internet more and more sites, resulting in fewer IP address resources, In order to make better use of the existing IP address resources and reduce waste, the IP address can be further divided into smaller networks, that is, sub-network division. In order to create subnets, the hos

Theoretical learningproblem 1 : How does the switch work? By learning the computer MAC address of each interface, it realizes the data communication of each computer, and the routing table of the router is similar, the switch is realized by the Mac-port mapping table.problem 2 : Two layer switch, three layer switch, router difference? Two-layer switch: For switching, LAN, WAN switching onlyLayer Three switch: Also known as the routing switch, with the dual functions of routing and switching, onl

is standardized in RFC1058 in 1988. In version 2 described in RFC1388, support for VLSM (VariableLengthSubnetMasks) is added, but it does not make up for the major defects of the Protocol. For example, in a network with multiple paths to the same destination, it takes a lot of time for RIP to determine a selectable path. In a network without multiple paths, the RIP Protocol has been widely used. The RIP Protocol is listed as the distance vector proto

We will summarize some of the features of the RIP routing protocol. We hope to help you consolidate your basic knowledge in this area. The RIP routing protocol is a dynamic routing protocol. So I don't know if you have clearly defined his concepts and features. RIP (RIP) is the first open standard used by router manufacturers. It is the most extensive routing protocol and can be obtained on all IP routing platforms. When RIP is used, a Cisco router can be connected to a router of another manuf

reversal · Bellman-Ford Algorithm · R12002 supports VLSM and automatic summarization. Internal Gateway Routing Protocol/Enhanced Internal Gateway Routing Protocol IGRP/VPN) The internal gateway routing protocol is a Cisco proprietary protocol developed in the middle of 1980s. It helps overcome the defects of routing selection information protocols such as a single measurement standard for computing hops. The Internal Gateway Routing Protocol has stab

Comparison of ospf, Ospf, and rip: Comparison of ospf and rip: Limitations of RIP arising from the use of large networks: 15 hop restrictions of RIP, A route with more than 15 hops is considered inaccessible to RIP and cannot support a variable long Subnet Mask (VLSM), resulting in inefficient IP Address Allocation and periodic broadcast of the entire route table, applications on low-speed links and wide area networks will cause major problems. The co

The RIP routing protocol is a dynamic routing protocol. So I don't know if you have clearly defined his concepts and features. To let more friends tell us the difference between the RIP and other routing protocols, let's review some of the features of the RIP routing protocol. RIP (RIP) is the first open standard used by router manufacturers. It is the most extensive routing protocol and can be obtained on all IP routing platforms. When RIP is used, a Cisco router can be connected to a router

measure of the update packet being accepted or the timer expires. (The time that the failed route exists in the router)4. Route Refresh Timer: Sets the time interval (240s) that routes become invalid routes and removed from the routing table· Configuration of RIP routes:Show IP Protocol View GatewayClear IP route * clearly routing table• Modify RIP version 2:Router (config) #router ripRouter (config-router) #version 2Router (config-router) #no auto-summaryR1:Router RIPNetwork 192.168.3.3 150R2:

" operation with the IP address. For traditional IP address classifications, the subnet mask for Class A addresses is the subnet mask for the 255.0.0.0;b class address is the subnet mask for the 255.255.0.0;c class address is 255.255.255.0. For example, if you want to divide a class B network 166.111.0.0 into multiple Class C subnets, just set its subnet mask to 255.255.255.0, so that 166.111.1.1 and 166.111.2.1 belong to different networks. As such, the method of dividing a network into multipl

[Translation] IP subnet division Original article title: IP subnetting made easy Address: http://articles.techrepublic.com.com/5100-10878_11-6089187.html IP network engineers need to have a solid understanding of how IP subnet division works. however, this topic is often ignored by instructors and the students are very confused and nervous about it. george ou developed a simple, graphical method to explain IP subnet division in a simple and easy-to-u

The following is from the author of the "network administrator must read-Super network Management Experience" (2nd edition) The first thing to understand here is what it means to make a molecular network, which is one of the things that many readers don't understand. As we all know, the use of subnetting subnet in the subnet division not only can not increase the new available IP address, but also loss of a part of the IP address. To illustrate this

), latency (Delay), Reliability (reliability), load (load), etc. but its disadvantage is that it does not support VLSM and discontinuous subnets. IGRP configuration: Router (config) #router igrp 100 (100 is an autonomous system number) Router (config-router) #network Network-number Router (config-router) #exit Attention: 1 The valid range of the number is 1-65535, the number is used to determine a set of regions with the same number of routers a

0 , a long line of digits, and a bit representing the network portion of the front-to-back continuous 1 . The default subnet mask, not all networks require subnets:The default subnet mask for class A IP addresses is 255.0.0.0;The class B IP address is 255.255.0.0;the class C is 255.255.255.0. The subnet mask uses the same addressing format as the IP address, the portion of the subnet mask of 1 corresponds to the network (and subnet) portion, and the subnet mask of 0 corresponds to the host por

must be started to block the port that generated the loop. The router's routing protocol does not have this problem, there can be multiple paths between routers to balance the load, improve reliability.2. Load concentration: There can only be one path between switches, so that information is concentrated on one communication link and cannot be dynamically allocated to balance the load. While the router routing protocol algorithm can avoid this, the OSPF routing protocol algorithm can not only p

algorithm must be started to block the port that generated the loop. The router's routing protocol does not have this problem, there can be multiple paths between routers to balance the load, improve reliability.2. Load concentration: There can only be one path between switches, so that information is concentrated on one communication link and cannot be dynamically allocated to balance the load. While the router routing protocol algorithm can avoid this, the OSPF routing protocol algorithm can

I. OSI seven-layer modelSecond, the TCP/IP modelThree-time handshake principleThird, the default port for common servicesIv. IP Address, subnetting basicsCommunication principle: The interaction of general data is generated in the application layer (TCP/IP model), the application layer can be seen as a porter, the different layers of the protocol defines the work of different porters, until finally, the transfer of data to another host application.I.