layer 2 network switch

The framework layer and native layer implement network control (iptable mode) and nativeiptable In recent work, you need to develop a function-network control, which is actually used by the root Android machine. It should be known that an application is prohibited from connecting to a mobile

This article is a stage record. If there is an error, please point it out to Tom... (14 bytes) Ethernet header = (6 bytes) Destination MAC address + (6 bytes) source MAC address + (two bytes) Frame Type value, Frame Type value: for example, IPv4 is 0x0800 and ARP is 0x0806. After the link layer (NIC-driven macb_rx_frame () receives an Ethernet frame, the interface function netif_receive_skb () (netif_rx actually calls netif_receive_skb) to the

automatically update the VLAN configuration information between them in the future, and the network administrator does not need to perform the same configuration operation again. To enable the GVRP function of a switch port, you must enable the global GVRP function of the switch where the switch port is located, you

Tags: VLAN, firewall, access interface isolationI. Network isolation1. physical isolation. Building two completely independent networks is also the safest way for the most local tyrants.2. layer-2 isolation. Use VLAN isolation and use different VLANs or pvlan.3. layer-3 isol

of enterprises. The reliability of metropolitan area Network router is embodied in the following two aspects, one is the reliability of the equipment layer, the other is the reliability of the network layer. The network reliability is an important content of the reliabili

[Problem description] Print the binary tree created in [binary tree 1] layer by layer, that is, the first line prints the 0th layer root node, and the second line prints the first layer ...... And so on. [Example] A binary tree is as follows: The output is as follows: [Code] The beauty of programming introduc

of enterprises. The reliability of metropolitan area Network router is embodied in the following two aspects, one is the reliability of the equipment layer, the other is the reliability of the network layer. The network reliability is an important content of the reliabili

802.3 frames and then transmits them to a wireless switch through a dedicated tunnel. From the perspective of the wired network, the wireless switch + lightweight AP is more like an enhanced AP that extends many external antennas. The advantages of a wireless switch are as follows: Advantages of wireless

language involved is JS (jqery), Java, HTML. Java-specific servlets interact with JSP (HTML), List-to-json in Java, jquery manipulation DOM elements, Ajax technology, Highcharts, Java multithreading, Java timed Tasks, and JS timed refreshes. Feeling, their basic knowledge is really not solid, reading + practice, leak check.(5) The most risky part of the project should be done first. Just put this sentence on the heart, this time really realized. Previously did not touch the Java multithreaded p

violation protectSwitchport port-security mac-address AAAA.BBBB.CCCCTest connectivity again650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/79/84/wKiom1aTZKvSWuVWAAAfdSm1WZU460.png "title=" m4.png "alt=" Wkiom1atzkvswuvwaaafdsm1wzu460.png "/>650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M02/79/84/wKiom1aTZMqxOHaiAABEZSKIQJM171.png "title=" m5.png "alt=" Wkiom1atzmqxohaiaabezskiqjm171.png "/> You can also set the maximum number of MAC addresses the port can learn and set stick

: No Related devices: hubs (i.e., the often-said hub) Layer 2nd or Data link layer Name: Data Link Layer Function: Make the machine in the LAN connect with each other Auxiliary action: Detect transmission errors Related devices: Switches (that is, often called switch)

Idea: Configure The VTP host and client, enable IP routing, and divide VLAN -----> define IP addresses for each VLAN port, and enable trunk ------> enable DHCP on The vtp server, and define IP-pool, set different CIDR blocks to VLAN interface IP addresses as gateways ------> Add ports to corresponding VLANs -------> set management IP addresses and passwords of vswitches 650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M02/4C/42/wKiom1Q6Ms_AiVU2AAH5SP-f5do600.jpg "Title =" Capture

To enable my first friend who came into contact with LINQ to discuss it together, I provided a step-by-step approach and started with the most basic operations. I will not talk much about the advantages of the three-tier architecture. When we get started, we will start our work directly. Step by step 1. Open vs2008, create a new site, and directly copy the provided northwind database to app_data. Right-click the root directory, add new item, select "LINQ to SQL classes", select "C #", and renam

very high. The layer-3 switches provide both the routing function and the network speed of layer-2 switches. Layer-2 switching is based on MAC addressing, while layer-3 switches are co

Three-tier switch set PPPOE dial-up configuration PPPoE: 1. physical Interface: Enable PPPoE Association logic interface without IP address-if) # no ip add-if) # pppoe en-if) # pppoe-client dial-pool-number dialing pool number 2. logical interface: Create www.2cto.com-if) # int dialer No.-if) # ip add negotiated3. bind to PPP:-if) # encapusation ppp4. associate physical interface:-if) # dialer pool dialing

IPV4 Address:We know that at the network layer (the Internet layer of TCP/IP architecture), one of the most important protocols is IP protocol, is now in the IPV4 and IPv6 transition period, but at present, IPV4 is still mainstream, so the main Ipv4.Basic IP Address format:The format of the internal IP address of the computer is represented by a 32-bit binary num

and ipconfig. They do not need to learn new things at all. Everything is accelerated by hardware ." There is no big difference between a Linux server and a switch running Cumulus Linux-the main difference is the number of ports on each device. A Linux server may only have 2 ~ Four layer-2 and

this series of tutorials is mainly about TCP/IP protocol. For programmers, mastering the 4-tier protocol stack is sufficient. They include: link layer, network layer, Transport layer, application layer.1, Link layer:

modern communication network mostly adopts optical fiber technology, the main bottleneck of the current data network is node router. Now the third layer of exchange, routing exchange or other related nouns are the embodiment of this idea. Although the third exchange was originally designed for the local area network,

switch, so it is called "Out-of-band management" Out of band ). 498) this. style. width = 498; "border = 0> In this mode, the switch provides a menu-driven console interface or command line interface. You can use the "Tab" key or the arrow key to move the menu and sub-menu, press the Enter key to execute the corresponding command, or use a dedicated switch to ma