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TCP/IP Learning Note (iii)--IP,ARP,RARP

Wlan0;172.28.185.136172.28.185.136...Of course, there is not necessarily a connection, the other side does not necessarily open telnet, but can still trigger ARP request, Tcpdump returned as follows:Listening on Wlan0, Link-type EN10MB (Ethernet), capture size262144bytes the: One:37.230876 9C:4E: $: C6:e8: the(Oui Unknown) > Broadcast, EtherType ARP (0x0806), length the: Request Who-has172.28.185.136Tell172.28.185.203, length - the: One:37.278147Ac -:3D:B2:C0:B4 (Oui Unknown) >9C:4E: $: C6:e8:

Computer networks--Network layer

mask, so that it is convenient to obtain the IP address of the network address, and do not need to find the routing table. A subnet mask is an important property of a network or a subnet. In each item of the router's routing table, in addition to giving the destination network address, you must also give the subnet mask for the network. If a router is connected to two subnets, two IP addresses and subnet masks are given 、、。 Forwarding by using subnet time group

The difference between switching and routing

can be multiple paths between routers to balance the load, improve reliability.3, subnetting: The switch can only recognize the MAC address. The MAC address is a physical address and has a flat address structure, so you can't divide subnets by MAC addresses. While the router recognizes the IP address, the IP address is assigned by the network administrator, is the logical address and the IP address has a hierarchy, is divided into network number and

Computer networks: Network layer

divide its physical network into several subnets. Dividing subnets is purely a matter within a unit, and it still manifests itself as a network2. The method of subnetting is to borrow several bits from the host number of the network as the subnet number, of course, the host number corresponding to reduce the same number of digits, the IP address becomes: IP address::={3. Any IP datagram sent from another network to a host in this unit is still locate

Xiaoge teaches you fast subnet partitioning

172.16.127.255 and 172.16.191.255, respectively.5. Valid host range is: the host address of the first subnet is 172.16.64.1 to 172.16.127.254; the second one is 172.16.128.1 to 172.16.191.254.Class B Address Example 3: Network address: 172.16.0.0; Subnet mask 255.255.255.224 (/27)1. Subnet Number = 2 of 11 -2=2046 (because the class B address default mask is 255.255.0.0, so the network bit is 8+3=11)2. Number of hosts = 2 of 5 square -2=303. Valid subnets?: Block size=256-224=32; So the first s

"Computer network Fifth edition" Reading note four: Network layer

diagram of the whole network Can update the database faster, the update process converges quickly In order for OSPF to be used in a large-scale network, it divides an autonomous system into multiple regions, so that the range of exchange-state information using the flooding method is limited to every region, reducing the amount of traffic on the network OSPF is sent directly with an IP datagram without UDP OSPF can calculate different routes for different types of business L

"The three anniversary of 51CTO College" My harvest at the Academy

.... are learning ...There is also a Han Ligang teacher's course is also very good, learning the IP address subnetting Ultimate Explanation V2 Video Course after the conversion of the value of a more profound understanding ...650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M02/82/39/wKioL1dOsA_iQdWhAADb6OrZNRk495.jpg-wh_500x0-wm_3 -wmp_4-s_1174112190.jpg "title=" IP address. jpg "alt=" wkiol1dosa_iqdwhaadb6orznrk495.jpg-wh_50 "/>The 2 standard

It's not IPV6 for a man to live his life as a IPV4 (iii)

, and hosts within the private network cannot communicate directly with the public network. But through the network address translation, they can do the latter.And then what. Then represents the IPV4 of the past, just like the simple occupation of operations, will soon be forgotten. Just a matter of time, so in the IPv4 world, we are 32-bit, this 32 is like the song fat that can't Meet the girl, do not like to say that they are fat skinny. Even if the affectionate singing Buddha in a line, or ca

Simple understanding of computer communication

local LAN, not used in the public network.subnets and masks:Traditional IP Address allocation method, the waste of IP address is very serious. In order to make full use of the existing IP address, the concept of mask and subnet (subnet) is proposed.The mask is a 32-bit number corresponding to the IP address, some of which are 1, and some 0. In principle these 1 and 0 can be arbitrarily combined, but generally in the design mask, the network number and subnet number of the bit value is 1, the ho

Free to learn desktop engineer, System engineer, system operation engineer

Technology and application OSI and TCP/IP model, subnetting, VLAN, VTP, STP, ACL, OSPF and other network technologies 240 World top 500 Enterprise Desktop Engineer Course Enterprise Common computer hardware and software failure, Enterprise Client security, Outlook mail client, Lotus notes mail client, print scanning machine enterprise application, projector enterprise application, service desk, event management, problem

Introduction to subnets and subnet masks

"192.12.0.0/19"2, 10000001.00001010. 00100000.00000000/19 "192.12.32.0/19"3, 10000001.00001010. 01000000.00000000/19 "192.12.64.0/19"4, 10000001.00001010. 01100000.00000000/19 "192.12.96.0/19"5, 10000001.00001010. 00000.00000000/19 "192.12.128.0/19"6, 10000001.00001010. 10100000.00000000/19 "192.12.160.0/19"7, 10000001.00001010. 00000.00000000/19 "192.12.192..0/19"8, 10000001.00001010. 11100000.00000000/19 "192.12.224.0/19"Select 7 from each department and assign one. The number of hosts availa

How do I handle a PHP page that turns English pages into French?

about how PHP pages turn English pages into French Title. I was trying to press a button. Convert all pages in a website from original English to French. I'd like to ask if this is possible. How can I change a single page from English to French? Seek the Great God. ------Solution-------------------- Customize multiple languages, such as en_lang.php,fr_lang.php, to write all variables in 2 different cases in the language pack. Determine which file to invoke by session. ------Solution---------

The Essential Skills to becoming a Master Hacker

2 Networking SkillsYou need to understand the basics of networking, such as the following. Dhcp Nat Subnetting IPv4 IPv6 Public v Private IP Dns Routers and switches VLANs OSI model MAC addressing Arp As we are often exploiting these technologies, the better you understand how to they work, the more successful you'll be. Note that I do not write the guides below, but they is very informative an

Analysis of broadcasting

, irrelevant. Their concept of the network, the network number is not the same as the theoretical books, we talked for a long time before we found two people, not a thing to say. Such as:After introducing subnetting conceptsnetwork Block =(network number >,subnet number >,host number >) (1)After the introduction of the subnet mask concept Network block = ( network number >, host number >) (2) Although the subnet number of the formula (1

Summary of IP addresses and subnet masks

guarantee the uniqueness of the host address, but brings two burdens: first, huge network address management overhead; second, the gateway path is expanding rapidly. The second is particularly prominent. The expansion of the path finding table not only reduces the efficiency of the gateway path finding (or even overflows the path finding table, resulting in a path finding fault ), more importantly, it will increase the overhead for refreshing internal and external paths, thus increasing the net

About the problem of the subnet mask appearing odd in the subnet partition

An odd number of subnet masks appear on subnetting

How to divide a subnet mask

172.16.127.255 and 172.16.191.255 respectively.5. The effective host range is: the host address of the first subnet is 172.16.64.1 to 172.16.127.254; the second is 172.16.128.1 to 172.16.191.254 Class B Address Example 3: Network address: 172.16.0.0; Subnet mask 255.255.255.224 (/27)1. Subnet = 2 of 11 -2=2046 (because the class B address default mask is 255.255.0.0, so the network bit is 8+3=11)2. Number of hosts = 2 of the 5 square -2=303. Effective subnet?: Block size=256-224=32; So the fir

Network IP partitioning method for over 250 computers

Now many units and companies set up their own local area network, the general LAN only allow 0----255 IP address, how the local area network more than 255 computers, then IP address how to divide it? Network IP Address "main" divided into three categories of ABC, the following is the scope of coverage below the method, I hope to help you !: Class A: 0.0.0.0-127.255.255.255, whose subnet mask is 255.0.0.0 (another way to annotate by subnet mask is/8, which is to convert the subnet mask to binary

More than 255 computers in the intranet IP planning detailed

The network IP address "main" is divided into three categories of ABC, the following is the scope of coverage: Class A: 0.0.0.0-127.255.255.255, whose subnet mask is 255.0.0.0 (another way to annotate by subnet mask is/8, which is to convert the subnet mask to binary, from left to 8 1) Class B: 128.0.0.0-191.255.255.255, whose subnet mask is 255.255.0.0 (another way to annotate by subnet mask is/16, which is to convert the subnet mask to binary, from left to 16 1) Class C: 192.0.0.0-223.255.2

CISCO PT Simulation Experiment (14) router configuration for OSPF dynamic routing

a database with the whole network link state, then adopt The SPF algorithm, which is the root of itself, calculates the shortest path to other networks and eventually forms the whole network by information. Has the following characteristics: Adopt the design of layered routing, can divide the region, support large-scale Internet environment; Allow multi-developer device integration (open standards); Support for variable-length masks (VLSM

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