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The principle of layer-3 switching has always been the most difficult for many readers to understand. In daily reader exchanges, we often see readers raise this issue, especially the differences and connections between layer-3 switching and routing principles. In fact, a layer-3 switch is closely related to both layer-2 switching and routing, and relies on layer-3 ARP protocol. The following describes the principle of layer-3 switching. Layer-3 Switching Principle L2 switches generally use the

egress regardless of the port. Dynamic Update of MAC Address Table To know which port is used to transmit frames, A vswitch must first learn the devices on each port. As the switch learns the relationship between the port and the device, it establishes a MAC address table or Content Addressable Storage table (CAM ). CAM is a type of memory that is used to quickly search applications. The switch records the

Disable forwarding of a specific MAC address on a cisco SwitchIt is really annoying to see other illegal DHCP in the LAN. In addition to the dhcp snooping method, you can also directly disable the mac address! The MAC address of machine A is 00-01-02-03-04-05, which is connected to port F0/3 of Switch B, port F0/3 is in VLAN3. Currently, forwarding of A is blocked on port B. You can set the following according to different vswitches: CatOS (v5.5 or above ): set

Method:PrivateCamera Openfrontfacingcameragingerbread () {intCameracount = 0; Camera Cam=NULL; Camera.camerainfo Camerainfo=NewCamera.camerainfo (); Cameracount=Camera.getnumberofcameras (); for(intCamidx = 0; Camidx ) {camera.getcamerainfo (camidx, camerainfo); if(Camerainfo.facing = =Camera.CameraInfo.CAMERA_FACING_FRONT) { Try{Cam=Camera.open (CAMIDX); } Catch(RuntimeException e) {log.e (TAG,

Text/figure Liu Zhisheng's ARP Spoofing Attack and Defense Technology are both mature. previous articles in the magazine also described in more detail, so I will not go into detail here. This article focuses on how to do not use ARP spoofing for sniffing and session hijacking. The actual attack method is MAC spoofing.PrinciplesBefore starting, let's take a look at the forwarding process of the vswitch. When a port of a vswitch receives a data frame, first check that the destination MAC address o

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' comments on manuscripts, and G. Burns P. Shambon and G. The plasmid of the Felsenfeld. This work is supported by the American Heart Association (KK and YF), JDRF (RMA) and JSP (KK) to support the postdoctoral fellowship; NIH training grants HL007208 at the Massachusetts General Hospital (AAW) and HL007101 at the Duke University Medical Center (GFE); from Nhlbi (HL064282 to te,hl054737 to dyrs, and HL081674 to KDP), Nigms (GM075846 to Cam), March co

analysis of effect data after CATIA using LMT Licmanager systemNBSP;NBSP;NBSP;NBSP, catia is English computeraided Abbreviation for Tri-DimensionalInterfaceApplication. is one of the most popular CAD/CAE/CAM integrated software in the world. In the 70 's DassaultAviation became the first user of,catia also emerged. From 1982 to 1988,catia released version 1, 2, 3, and in 1993 released a powerful 4 version, now catia software is divided into V4 versi

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to early active and passive solutions, where space limitations are not introduced.Related concepts The principle is complete, and talk about some concepts related to autofocus.Focus SpeedHere are a few things that affect the focus speed:1. Focus mode and specific execution method2. Sensitivity (sensor)3. Motor (Actuator)4. Lens arrangementfocus mode and algorithm , focusing mode selection, will affect the speed of autofocus. In the phase scheme, the sensor value of a single state can be u

USB deviceWhen we mention it, we will think of it as a USB drive or USB data cable.However, the current USB manufacturer has changed the USB design mode and has been converted into some more useful and creative devices. You never thought of a transformer as a USB, and so on, today I will introduce you to someThe creative side of USB devices, some of the best and most creative USB devices, USB power supply, to make full use of its potential, so that you can enjoy your life comfortably. In this ar

widely used 3D model software in the RepRap open source community. FreeCADFreecad is an open source free 3D CAD software from the French Matra Datavision, a functional, parametric modeling tool based on the core of the cad/cam/cae geometry model. FREECAD's direct user objectives are mechanical engineering, product design and, of course, for other users in the engineering industry, such as construction or other special engineering industries. Wings3dW

Device SafetyConfigure the console passwordSwitch (config) #line console 0Switch (config-line) #loginSwitch (config-line) #password CiscoConfigure the Vty line passwordSwitch (config) #line vty 0 4Switch (config-line) #loginSwitch (config-line) #password CiscoConfigure the Enable passwordSwitch (config) #enable password CiscoConfiguring the Secret PasswordSwitch (config) #enable secret CiscoGlobal encryption EnabledSwitch (config) #service password-encryptionPort Security : For two-tier interfac

. Transform. transformpoint can be used to convert coordinate points from a local coordinate system to a world coordinate system, transform. inversetransformpoint can convert coordinate points from the world coordinate system to the local coordinate system; transform. transformdirection and transform. inversetransformdirection converts vectors between the world coordinate system and the local coordinate system. For example, convert the object location to the coordinates in the camera coordinate

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The main cycle (Root: startRendering) of Ogre is similar to this: 1. The Root object calls the frameStarted method in all registered FrameListeners. 2. render a frame of the Root object. 3. The Root object calls the frameEnded method in all registered FrameListeners. Frame Registration Method MRoot-> addFrameListener (mFrameListener ); Each frame has the methods frameStarted and frameEnded. Bool frameStarted (const FrameEvent evt)Bool frameEnded (const FrameEvent evt) The above two methods c

Tsen /")4. Return the statement box of "Mary Tsen". If the author value is Cn = Mary Tsen/ou = authentication/o = Acme.@ Prompt ([OK]; "common name"; @ name ([CN]; author ))5. The returned response @ name ([ou2]; author)6. Return "US \ Acme \ R D \ Development \ documentation \ Authentication.@ Name ([tokeyword]; author)7. Return the external receiver address "streitfeld, Sara (Miami)" @ Name ([LP]; user_name)8. Back to external pickup address "streitfeld, Sara (Miami)" "streitfeld, Sara (Miam

Background: 1. The relationship between the IP address and the MAC address in the ARP table of the layer-3 device. 2. the forwarding bridge table of the L2 device stores the correspondence between MAC and forwarding ports. 3. CDP (Cisco Discovery Protocol) is the link layer protocol for discovering adjacent devices between Cisco devices. 4. The forwarding table in the layer-2 module of a layer-3 switch is implemented in a cam table, such as sh