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Take the Cisco 2950 vswitch as an example. log on to the vswitch and enter the management password to enter the configuration mode. Then, run the following command: Switch # config Terminal # Enter the Configuration Mode Switch (config) # interface fastethernet 0/1 # Enter the specific port configuration mode Switch (config-If) # switchport port-secruity # Configure port security mode Switch (config-If) switchport port-security Mac-address

Simply put: The IP address is the service provider to you, the MAC address is the physical address of your network card.First, IP addressFor IP addresses, I believe everyone is familiar with the 32-bit address assigned to the host using the TCP/IP protocol. The IP address is composed of 4 88-bit groups separated by dots, such as 192.168.0.1 is an IP address, which is called dotted decimal format. The IP address consists of the network address and the

MAC address is in the media access layer to use the address, popular point is the physical address of the network card, now the MAC address is generally used 6-byte 48bit (in the early and 2-byte 16bit of the MAC address). As for MAC address, because we do not contact with it directly, so we are not necessarily very f

Simply put, the IP address is provided by the service provider, and the MAC address is the physical address of your Nic. I. I believe everyone is familiar with the IP address, that is, the 32-bit address assigned to the host using the TCP/IP protocol. An IP address consists of four octal groups separated by dots. For example, 192.168.0.1 is an IP address, which is written in dotted decimal format. An IP address consists of a network address and a host

MAC Address Overview Mac (media access control), or MAC address, hardware address, used to define the location of the network device. In the OSI model, the third layer of the network layer is responsible for the IP address, and the second layer of the data link layer is responsible for the Mac site. Therefore, a host

Come from:http://blog.csdn.net/lonelyroamer/article/details/7630594 I. Overview The MAC algorithm combines the advantages of the MD5 and Sha algorithms and joins the key support, which is a more secure message digest algorithm. MAC (Message authentication code, messaging authentication Code algorithm) is a hash function algorithm with key, which is compatible with the characteristics of MD and SHA algorith

1MAC OS 91 Common desktop operating systemsAfter several beta versions, Apple finally officially announced OS X 10.10 Yosemite os. Apple says the 11th edition of OS X is the biggest change in visual performance since its inception in 2001. So, is that really the case? Let's take a look at the history of OS X systems.Apple Mac OS x System 13-Year vision change historyEarlier versions of OS X were coded for large cats inside Apple computers, such as the

now a lot of friends with Apple Mac computer, according to many netizens questioned that Mac computer running is also more and more slow, with the old XP era of computers, time has become more and more cards. The truth is the same, from the computer's usual use of methods and maintenance skills, are nothing more than software and hardware these two pieces. The following tutorial home will introduce the more

Tags: source IP source mac destination IP destination macSource IP Source Mac destination IP destination mac, changes throughout the network.Local network:The 1.vlan+mac is addressed in a way that does not cross the gateway. The source IP source mac and destination IP

The Ethernet MAC address uniquely identifies each Ethernet device in the world. This article describes how to obtain the MAC address and how to change the MAC address. Obtain the MAC address In the command input window of the switch, enter "show mac-address-table" to obtain

An Ethernet NIC consists of two layers of the OSI (open-party system interconnection) model. Physical Layer and data link layer. The physical layer defines the electrical and optical signals, line statuses, clock baselines, data encoding, and circuits required for data transmission and receiving, and provides standard interfaces to data link layer devices. The data link layer provides addressing mechanisms, data frame construction, data error check, transfer control, and standard data interfaces

To make the frames sent by a network adapter receive and process the frames correctly, IEEE stipulates that each network adapter has a unique ethernet address-MAC address (which is called MAC address by IEEE ). Because the addressing details are defined by MAC protocols such as 802.3 ). The MAC address has 48 bits (6 b

I. IP Address I believe everyone is familiar with the IP address, that is, the 32-bit address assigned to the host using the TCP/IP protocol. An IP address consists of four octal groups separated by dots. For example, 192.168.0.1 is an IP address, which is written in dotted decimal format. An IP address consists of a network address and a host address. The number of BITs assigned to these two parts varies with the address class A, B, and C. The network address is used for routing, while the

the Mac.The second phase of the testing process can use the iOS device target platform and requires a test iOS device connected to your Mac. The top half of this tutorial describes the steps you need to take to run an iOS application on your Mac's iOS simulator. The lower half of this tutorial describes the additional steps you need to take to run an iOS application on iOS device. Mac req

NET-Port Literacy II: A simple analysis of the principle of Mac and PHY composition 1. General The following figure is a schematic diagram of the network port. The network port is composed of CPU, Mac and PHY. The DMA controller is usually part of the CPU and is placed here in order to indicate that the DMA controller may be involved in the network port data transfer. For the above three parts, and not ne

　IP/MAC Binding RequirementsThe MAC address and IP address binding, can prevent IP address spoofing network attack, IP spoofing attack attempts to use a trusted computer's IP address from different computers to connect and through the firewall, IP address can be easily changed, but the MAC address is in the factory production is added to the Ethernet card, it is

Resolution of IP addresses and MAC addresses I. I believe everyone is familiar with the IP addresses, that is, the 32-bit address assigned to the host using the TCP/IP protocol. An IP address consists of four octal groups separated by dots. For example, 192.168.0.1 is an IP address, which is written in dotted decimal format. An IP address consists of A network address and A host address. The number of BITs assigned to these two parts varies with the a

Please input the Mac:00: 1A: A9: AA: BB: CCNew MAC for decrease is: 00: 1A: A9: AA: BB: CBNew MAC for increase is: 00: 1A: A9: AA: BB: CD # Define bool int# Define false 0# Define true 1# Include # Include Bool macdecrease (char * Mac) // decrease Mac by one{Int num = 16

Wireless MAC address filtering is an efficient method to prevent wireless network access. However, when multiple routers are connected to the network, you need to set filtering rules on multiple routers, the setting methods vary slightly in different networking modes. This article describes how to set up wireless MAC address filtering for WDS bridging and wired LAN cascade networking.Note:The router managem

One-click setting script for network IP address/MAC address/network proxy... It is always in use, but not exclusive. Share it... @ Echo offRem #----------------------------------Rem # interface IP configurationRem #----------------------------------Echo ####################################### ###################Echo ####################################### ###################Echo ######Echo ### IP fast confion (c) Copyright do2jiang. CSU. 2008.9 ###Ec