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sub-layers: the MAC (Media Access Control) layer and the LLC (Logical Link Control) layer. The common L2 standard for LAN and man is IEEE 802 protocol. In the wide area network, HDLC (High-Level Data Link Control, advanced Link Control), PPP (Point-to-Point Protocol, Point-to-Point Protocol), and Frame Relay (Frame Relay) and other protocols are widely used. Routing is a layer-3 concept. The network layer is the most important in the Internet, and it

hundreds of customers understand and use the software. In addition, the QPM Team works closely with the Microsoft team to support product development and testing. Quantumpm is a company that provides products and services for projects, system customization services, portfolio management, and other products and services. It aims to help its customers obtain solutions that exist in the real world. Quantumpm provides management consulting, technical consulting, training and hosting services, earni

One day, he argued with a salesman of inspur. He said that ADSL + vrouters share the Internet and I think shared Internet can be used without a vro, I have not seen what the vro looks like), because I have entered the ADSL configuration interface. I tried it myself when I was free. Good luck. The ADSL modem at hand is ql1880, with built-in routing and pppoe protocols. Its IP address is 192.168.1.1, And the Logon account and password are both root. Disconnect the telephone line, log on to the A

Firefox plug-in for saving web pages as images: Pearl Crescent page saver basic 2.5 PageSaver allows you to convert webpages into images, including Flash files on webpages. The webpage can be saved as PNG or JPEG as required. By using pageSaver: You can convert the whole webpage or the part you see on the screen to an image. To facilitate webpage capturing, the plug-in provides a large number of settings options, including the default file name, file suffix name, and imageQuality (for example,

address class A, B, and C. The network address is used for routing, while the host address is used to find a separate host in the network or subnet. An IP address makes it possible to transmit data from the source address to the destination address through a route. 2. MAC addresses are not necessarily familiar with MAC addresses because they are not directly in contact with them. In the OSI (Open System Interconnection) layer-7 network protocol (physical layer, data link layer, network layer, t

startup. (J2EE load separation CloudScape SQL Server ). One of the very good features is that JBOSS can be "hot" deployed. The "hot" deployment means that the BEAN deployment simply copies the JAR file of the BEAN to the deployment path. If the BEAN has been loaded, uninstall JBOSS and LOAD a new BEAN version. If you need more JBOSS features, you can view the JBOSS Forum website. If yes, you can pay for JBossGroup LLC. This chapter step by step hel

-> pkt_type */else if (1/* dev-> flags IFF_PROMISC */) {if (unlikely (compare_ether_addr_64bits (eth-> h_dest, dev-> dev_addr) skb-> pkt_type = PACKET_OTHERHOST ;} /* Marvell switch chip dsa header */if (netdev_uses_dsa_tags (dev) return htons (ETH_P_DSA); if (netdev_uses_trailer_tags (dev) return htons (ETH_P_TRAILER ); /* the Ethernet header returns */if (ntohs (eth-> h_proto)> = 1536) return eth-> h_proto;/* the following processes non-Ethernet packets, do not discuss */rawp = skb-> data; if

The Unified Communication solution is a solution that many enterprises are considering to implement. So what are the current unified communication solutions on the market? What should enterprises pay attention to when selecting? In fact, like most shopping experiences, it is very important for us to examine multiple parties. We should not only look at the price and functional appearances, but also understand the background of the manufacturers. Smart users and smart choices Just as I know a comm

Start of work: After all the lines are connected, set IP Address: 192.168.1.XX = 2-8) and mask: 255.255.255.0 on the PC. Gateway: After Entering 192.168.1.1, do not forget to click "add". Otherwise, no gateway is entered)After confirming, the system prompts you to restart, enter the system again, open the browser, and enter in the address bar:Http: // 192.168.1.1 and press ENTERIn this case, the SmartAX MT800A setting screen is displayed. Since it is not difficult to operate in the future, I wil

Author: linyin (linyin.8800.org) is from Linyinblog. Implementation environment: # uname-aOpenBSDlinyin.8800.org4.3GENERIC.MP #0i386 #/usr/local/sbin/openvpn -- versionOpenVPN2.0.9i386-unknown-openbsd4 author: linyin (linyin.8800.org) Source:Linyin blog. Implementation environment: # Uname- OpenBSD linyin.8800.org 4.3 GENERIC. MP #0 i386 #/Usr/local/sbin/openvpn -- version OpenVPN 2.0.9 i386-unknown-openbsd4.3 [SSL] [LZO] built on Nov 11 2008 Developed by James Yonan Copyright (C) 2002-2005 O

Summary of php string usage. For more information about php strings, see. 1. Evaluate the length, the most basic $ Text = "sunny day "; $ Count = strlen ($ text); // $ count = 9 2 string truncationNumber of characters before truncation $ Article = "breaking news: In ultimate irony, man bites dog."; $ summary = substr_replace ($ article, "...", 40 ); 3 count words $ Article = "breaking news: In ultimate irony, man bites dog."; $ wordCount = str_word_count ($ article ); // $ WordCount = 8

The Relationship Between WiMax and WiFi is not in the same category. WiFi is a standard IEEE802.11x-related interoperability organization of the wireless LAN, wiMax is a standard IEEE 802.16x-related interoperability organization for wireless MAN. The two are applicable to different application types. Compared with WiFi, WiMax has better physical layer and MAC layer technologies, higher speed, better QoS, and competition. Wi-Fi is mainly used in the wireless LAN field, while WiMax is mainly use

Last weekend, Intel and micron, a joint venture Flash Manufacturing Company, IM Flash Technologies and LLC (IMFT), announced that they had begun the trial of 25 bn Flash memory chips. In addition to the paper announcement, they actually invited a number of media to visit IMFT's 25nm craft Fab in Lehi, Utah. IMFT factory at the foot of snow mountains In the factory structure, the most critical dust-free room for semiconductor products is located

, the ADSL interface on the separator is connected to the built-in ADSL Modem card, while the Phone interface is connected to the telephone line; 3. After the ADSL card is installed, turn on the computer power to start the system. After Entering the Windows interface, the system can automatically detect the newly installed unknown device, click "Next" as prompted to search for the latest ADSL card driver. After copying the relevant driver, the system will automatically detect the ADSL card; 4. W

, which is the gateway and Mask of the LAN. set the DHCP service to "System Allocated (automatically assigned by the System )". in addition, "User Mode" must be set to "Multi User". Otherwise, broadband sharing will fail. after setting, click "Submit" to Submit data. Click "WAN" on the left of the window to enter the "WAN Configuration" Setting dialog box. this is the most critical step in the entire operation. here, we need to change the PPP transmission mode "ENCAPSULATION" to "PPPoE

254 that is not used by other computers). The subnet mask is 255.255.255.0. Open the browser on your computer and enter "http: // 192.168.1.1 "the username and password are admin. Go to quick configuration and set relevant information. Users of Taizhou Telecom note that VPI is set to 8, VCI is set to 81, and other settings can be used by default. In the last step, click "application" instead of "application". Instead, right-click to view page properties and obtain the URL of the page. This URL

Take a look at vendor/yiisoft/yii2/base/arrayabletrait today.PHP/** * @linkhttp://www.yiiframework.com/* @copyright Copyright (c) Yii software LLC * @licensehttp://www.yiiframework.com/license/ */namespaceYii\Base; use yii;use yii\helpers\arrayhelper;use yii\web\link;use yii\web\linkable; //traits is a code reuse mechanism that is prepared for PHP-like single-inheritance languages. //trait to reduce the limitations of single-inheritance languages, dev

transparency of data transmission. ④ multiple Internet protocols: supports multiple Internet protocols (IP,IPX) Composition① a method that encapsulates an IP datagram to a serial link. ② Link Control Protocol Lcp.③ Network Control protocol. Data link layer using broadcast channel Lan In order to better adapt the data link layer to a variety of LAN standards, split it into two parts:① Logical Link Control

Now let us uncover the mysterious veil of YII2 's most basic class object.php class (he is the ancestor of all classes)!Directory location is base/object.phpPHP/** * @linkhttp://www.yiiframework.com/* @copyright Copyright (c) Yii software LLC * @licensehttp://www.yiiframework.com/license/ */namespaceYii\Base; use Yii;/** * Object is the base class that implements the *property* feature. * Object is a basic class that implements the function of propert

data. Typical protocol representatives: RPC, SQL, NFS, NetBIOS, SCP, ASP, SSH, Winsock, BSD sockets presentation Layer (Presentation) : Transforms the upper data or information to ensure that one host application layer information can be understood by another host's application. The data transformation of the presentation layer includes data encryption, compression, format conversion, and so on. Typical protocol representatives: TIFF, GIF, JPEG, PICT, ASCII, EBCDIC, encryption, MPEG, MIDI, HT