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"TCP/IP Detailed Volume 1: Protocol" 12th chapter broadcast and multicast---reading notes1. IntroductionBroadcast and multicast are used only for UDP, and they are important for applications that need to transmit messages to multiple recipients simultaneously.Sometimes, a host sends frames to all other hosts on the web, which is the broadcast.Multicast (multicast) is between unicast and broadcast: frames ar
Conflict domains and broadcast domains of network interconnection devices (1) A conflict domain refers to the minimum range of conflicts. When a computer and a computer are connected through a device, a channel is established. If this channel allows only one data packet to pass in an instant, if there are two or more data packets that want to pass through the packet here, there will be a conflict. The size of the conflict domain can be used to measur
circulation. For example, IPsec AH authentication is required for group circulation between host A and host B. 4. Three types of operations are supported. Send messages to the kernel and open key management socket. You can request keys from the key management daemon. You can read data from the key management socket and request a key management daemon to install a SA for a New TCP session protected by the policy. Send a dump message. 5. Create a static Association The security parameter i
Network interconnection devices can divide networks into different conflicting and broadcast domains. However, different network interconnection devices may work at different layers of the OSI model. Therefore, the effect of dividing conflicting domains and broadcast domains is also different. For example, a repeater works on the physical layer, a bridge and a switch work on the data link layer, a router wo
In Enterprise Networks, broadcast data packets are a double-edged sword. On the one hand, it is a data packet necessary for normal network connection. For example, in the automatic IP address acquisition scheme, broadcast data packets must be used to find available DHCP servers. On the other hand, it is easy to be used by viruses or hackers, for example, network congestion caused by DOS attacks. Therefore,
The first two posts simply tidy up the ordinary broadcast, in fact, there is an orderly broadcast, orderly broadcast in the development is also more than the minimum, you can set priority for the broadcast receiver to control the order of acceptance, but can interrupt broadcast
Specific steps:1. Initialize the broadcast receiver Broadcastreceiver, and the received broadcast will be recalled in the OnReceive method of the class.2, registered broadcast registerreceiver(broadcastreceiver,intentfilter);3, send broadcast sendbroadcast (Intent);This demo is to verify that the activity that has been
Normal broadcastCreate a broadcast receiverClass broadcast extends BroadcastReceiver {@ OverridePublic void onReceive (Context context, Intent intent ){Log. I ("Ma", "broadcast ");}}Create a broadcast transmitterIntent intent = new Intent ();Intent. setAction ("com. xiazdong ");SendBroadca
Subnet Mask and IP address calculation network address and broadcast address conversion IP Address: 202.112.14.20.Subnet Mask: Too Many Subnet MaskWhat is the network address and broadcast address of this host?Solution:Step 1: Determine the network bit and host bit.First, convert the IP address (202.112.14.20.) to binary,That is: 11001010.0112.16.20171110.10001001Then, the subnet mask (subnet mask)
Original address: http://blog.csdn.net/liuhe688/article/details/6955668/ Broadcastreceiver is the "broadcast receiver" meaning, as the name suggests, it is used to receive from the system and applications in the broadcast. In the Android system, broadcast in all aspects, for example, when the system is completed after a broad
From theory to practice (8): event broadcast Three message exchange modes in WCF are discussed in the previous section: one-way, request/reply, and duplex. The first two items are relatively simple, and there is no need to talk about them. duplex is relatively complicated. The preceding section only implements simple callback. in actual application, there are many points worth noting, in this article, we will talk about the specific application of du
1. Introduction to unicast, multicast, and broadcast 1. 1. Unicast (unicast) Unicast means data transmission to a specific host. For example, an IP packet is sent to a host. At this time, the data link layer is given in the Data header is very specific destination address, for Ethernet, is the nic mac address (not FF-FF-FF-FF-FF-FF such address ). The current host with the routing function should be able to distribute unicast data in a targeted manner
BroadcastThat is, messages are sent to multiple computers in the subnet at the same time, and all computers in the subnet can receive messages sent from the sender. Each broadcast message contains a special IP address. There are two types of broadcast message addresses: local broadcast and global broadcast. When a
Unicast, broadcast, and Multicast I. Introduction 1. Three IP addresses are available: unicast address, broadcast address, and multicast address. 2. broadcast and multicast are only applied to UDP. TCP is a connection-oriented protocol that means two processes (determined by the port number) run on two hosts (determined by the IP address) there is a connection b
1. Introduction to unicast, multicast, and broadcast 1. 1. Unicast (unicast) Unicast means data transmission to a specific host. For example, an IP packet is sent to a host. At this time, the data link layer is given in the Data header is very specific destination address, for Ethernet, is the nic mac address (not FF-FF-FF-FF-FF-FF such address ). The current host with the routing function should be able to distribute unicast data in a targeted manner
in LAN technology, the two words of conflict and broadcast domain have a great impact on network performance, let's take a look at how these two words affect network performance. 1. The conflict zone of LAN technologyif you want to drive off the freeway, but every time you try, there is a car blocking your way. If forced out, collisions occur, similar to what happens on an Ethernet network using a carrier-listening multi-access (CSMA/CD) protocol with
The system takes advantage of Weibo for the forum, and adds broadcast, follow, @ friends, and comment reflux functions. The broadcast and follow functions allow users to share information and interact with their friends. users can publish broadcasts and @ friends on the broadcast channel. At the same time, with the Weibo review function, Weibo became the second b
PrefaceThis document is simply a logical algorithm, and how to compute network bits, host bits, and broadcast addresses in the case of known IP addresses and subnet masks. All steps are far from the most primitive binary way, the direct hit principle, please read carefully.1. Logic algorithmLogic and operations and logic or operations are used when computing network bits, host addresses, broadcast addresses
One of the four componentsBroadcast recipient BroadcasetreceviceThe mechanism of information transfer in Android:Broadcast: One-way, massTo create a feature:1. Declare an inheritance broadcasetrecevice2. Declare in the manifest filePackage name. Class Name650) this.width=650; "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/ Images/localimage.png ") no-repeat center;border:1px solid #ddd;" alt= "Spacer.gif"/>To receive a
The system starts to reboot will send the power-on restart broadcast, low power will send low-battery broadcast, broadcast registration has 2 kinds: System description file XML registration and Java code Registration, the former is static registration (global registration) The latter is a dynamic registration (relying on the time of the building, component destru
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