1) layer-2 Exchange Technology
The layer-2 switching technology is relatively mature. The layer-2 switch is a data link layer device that can identify MAC locations in data packets.Address information, which is forwarded based on the MAC address, and the corresponding MAC addresses and ports are recorded in a local loc
Simply put: Layer-1 switchOnly physical layer protocols are supported (one phone-controlled switch can be called ???)L2 SwitchSupports physical layer and data link layer protocols, such as Ethernet switches.L3 SwitchSupports physical layer, data link layer, and network layer protocols, such as some switches with routing functions. In terms of the ISO/OSI hierarchy, switches can be divided into L2 switches and L3 switches. A layer-
Example:
3026
2012
5012. The value of 2nd bits is 0 ~ 4 indicates that it is a layer-2 switch.
3550. The fifth digit is 5 ~ 9 indicates that it is a layer-3 switch.
LI (LitesoftwareImage) indicates that the device is a weak feature version.
SI (StandardsoftwareImage) indicates that the device is in the standard version and contains basic features.
EI (Enha
the cache entries of the old a address space will affect the translation of the address space of the B process, so when the process switches, the TLB operation is required to clear the effects of the old process. We have one by one discussions below.2, absolutely no problem, but poor performance of the programWhen the system has a process switch, from process A to process B, which causes the address space
Title: Seek 1+2+...+n, the request cannot use multiplication and division method, for, while, if, else, switch, case and so on keyword and conditional judgment statement (A? B:C)
This problem is indeed a bit biased, most people on the internet to give the solution are recursive. public int sum (int n) {if (n==1)
return 1;
Else
Return N+sum (n-1);
Obviously, the condition is used to judge, does not meet the
Lan exchange technology can also be called layer-2 Switch Exchange Technology, the content mainly includes the working principle of Layer 2 switching, network loops, and how to use the Spanning-Tree Protocol to solve Network loops, VLANs, and VTP technologies, this article mainly introduces the working principle of L2 switches and the dangers of network loops. Ot
View C # (2) through IL)
Switch Statement (lower)
Address: http://www.cnblogs.com/AndersLiu/archive/2008/11/06/csharp-via-il-switch-2.html
Original: Anders Liu
Abstract: The switch statement is a common jump statement in C #. Different codes can be executed based on differen
Case four custom switches:
Function Introduction: The function of this case is to create a custom switch, you can decide the background of the switch. When the slide switch, the slider of the switch can follow the finger to move. When the finger is released, the slider slides to the right or to the far left, depending
Mac layer Attack rumor address floodA common two-layer attack or switch attack is a Mac flood, with an intruder using a large number of invalid source MAC addresses, which can cause the switch's cam table to overflow, because the switch cannot find the port corresponding to the destination MAC address in the MAC address table, causing the switch to periodically f
Aten Jinhua vs0201 2 port VGA video switch + audio Function
Vs0201
2 port VGA video switch + audio function 650) This. width = 650; "src =" http://www.aten.com.cn/images/uploadImages/Professional-Audio-Video/Video-Switch/products/VS0201-%E8%A7%86%E9%A2%91%E5%88%87%E6%8D%A2%E
Switch BASIC syntax structure:
switch (expression) {case
value 1: statement;
Case value 2: sentence;
Case Value 3: sentence;
...
Default:
statement;
Working principle: first match with the expression, match the success of the following case with the value of the execution of
Lab objectives:1. Master the configuration of the switch Tag VLAN;2. master the basic configuration methods of layer-3 switches;3. Master how to configure VLAN routing for layer-3 switches;4. layer-3 switches are used to implement VLAN visibility and mutual communication;Technical Principles:A layer-3 Switch has the network layer function. The principle of implem
maximum distance that the button can moveSwitchbtnx =switchbtnmaxslidedistance; }} log.i ("Test", "Action_move ...."); Break; Casemotionevent.action_up://when lifting, determine where the release is, thus determining the state of the switch if(Switchbtnx ) {switchbtnx= 0; } Else if(Switchbtnx >= SWITCHBTNMAXSLIDEDISTANCE/2) {switchbtnx=switchbtnmaxslidedistance; } Break; default:
Android custom control series 2: Custom switch button (1), android Control
This time, we will implement a complete and pure custom control, instead of using the system control like the previous Composite Control. The plan is divided into three parts:Basic Part of the custom control,Processing of touch events of Custom ControlsAndCustom properties of a custom control;
Next we will start writing the first par
Performance Tests on layer-2 and layer-3 vswitches with 24 ports and all-gigabit vswitches have encountered many problems recently. Experts have said that QoS ensures port congestion, high-priority data is processed first. It makes sense to improve the utilization of 24 fully-gigabit switches with insufficient bandwidth.
Three-tier competition
Layer 3 24-port full Gigabit Switch testing includes OmniSwitch
Switch command 2-Huawei20. to configure a switch as a command switch of a cluster, you must first assign an IP address to the management interface and then use the following command:Switch (config) # cluster enable cluster-name21. To delete a VLAN from a relay link, run the following command:Switch (enable) clear trunk
Note: The vlan number of a vswitch starts from VLAN 2 because the vswitch has a default VLAN, namely VLAN 1, which includes all users connected to the vswitch.
The VLAN configuration process is actually very simple. Only two steps are required: 1) name each VLAN group; 2) map the corresponding VLAN to the corresponding switch port.
The specific configuration proc
of using Server Load balancer to improve the scalability, availability, and manageability of Server clusters. This chapter mainly discusses the deployment of Server Load balancer and several solutions for deploying Server Load balancer in the existing network. We will also discuss how to design highly available solutions to implement fault tolerance for different network components throughout the network, including Load balancer.
Before discussing the network structure, we need to understa
server and the client are in the same network segment and are not DHCP relay agents, for Cisco's DHCP In the case of a server, if a request packet with Option82 is received, it is considered a request message from a DHCP relay agent, and the Giaddr field of the message is checked, but because it belongs to the same network segment, the field is 0.0.0.0 DHCP. The server will consider an illegal address, and this message will be discarded, causing the client to obtain no IP address(iv) Cisco DHCP
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