Saturday, January 22, 2011

Weak current College】 【switch based terminology】.

<br> <br> <br> 1. switch <br> <br> Switch is used to implement the switched network devices in the OSI model of ISO, it is located on the second floor - data link layer device that can perform actions .on frame, is an intelligent device. <br> <br> 2.IEEE802.3 Ethernet standard <br> <br> 3.IEEE802.3u fast Ethernet standard <br> <br> 4.IEEE802.3ab Gigabit Ethernet (unshielded .twisted pair) standard <br> <br> 5.IEEE802.3z Gigabit Ethernet (optical fiber, copper) standard <br> <br> 6.IEEE802.3x flow control standards <br> <br> 7.IEEE802.1X port .-based access control standard <br> <br> 8.IEEE802.1qVLAN standard <br> <br> Traffic priority control standard 9.IEEE802.1p <br> <br> 10.IEEE802.1d spanning tree Protocol <br> < .br> 11. data link layer <br> <br> Located in the ISO / OSI reference model, the second layer is responsible for the lines between the nodes through detection, flow control and resend, and a series of tools for error-free .transmission of a frame as a unit of data, from its previous layer (network layer) looks like a link with no errors. <br> <br> 12. full-, half-duplex <br> <br> In a network, .full-duplex refers to receive and send two mutually independent channel, at the same time, do not disturb each other. And half duplex is to receive and send sharing a channel, you can only send at a time, or can only receive, so .half duplex can be in conflict. The switch is a full-duplex device and the hub is a half-duplex device. <br> <br> 13.MAC address <br> <br> MAC address is in the media access layer using .address, popular point that is the network adapter (local area network node) physical address. In network underlying physical transmission process, through physical address to identify the host (LAN node), it generally is globally unique. Now the MAC address is generally takes .6-byte 48 bits. <br> <br> 14.IP address <br> <br> IP address is to each connection to host on the Internet is assigned a 32bit address. Through the IP address can access to each host. < .br> <br> 15. Adaptive / autonegotiation (Auto-Negotiation) <br> <br> Auto-Negotiation standard makes a switch in the following order adaptation work rate and working mode: 100M full-duplex, half-duplex 100M, full .10M, 10M half-duplex. <br> <br> 16. full-duplex flow control <br> <br> Follow IEEE802.3x standard, network congestion, the network device to use pre interpretations of Pause frames to perform flow control. .<br> <br> 17. the half-duplex flow control (back pressure skills Backpressure) <br> <br> Based on standard, when the processor IEEE802.3x found buffers will fill up, to issue a false origin station conflict signals .to delay a random time, and then continue to send. To mitigate and eliminate congestion. <br> <br> 18. wire-speed <br> <br> Switch forwards the data of the theoretical maximum. <br> 19. broadcast .storm control <br> <br> Network broadcast frames (as is forwarded) add and drastically affect normal network traffic for anomalies, broadcast storm takes quite objective of network bandwidth, causing the entire network does not work properly. Broadcast storm control allows ports appear .on the network broadcast storm perform filtering. Open broadcast storm control, when the port received broadcast frame count to predetermined threshold values, the port will automatically drop the broadcast frames received. When this feature is not enabled or broadcast frames is not cumulative to the threshold ., the broadcast will be normal broadcast to other ports of the switch. <br> 20.TRUNK (port aggregation) <br> <br> Is usually used to add more ports together to form a high-bandwidth data transmission channel. Switch put .together all of the ports as a single logical port. <br> <br> 21.VLAN (VirtualLocalAreaNetwork, virtual local area network) <br> <br> Is a group consisting of terminal station, broadcast domains are on the same VLAN hosts .(switch port) to communicate with each other, it is not necessary to consider specific wiring structure can establish logical groups. Flexible configuration, add the security of the system. <br> <br> 22.PortVLAN <br> <br> Port .-based VLAN, is on the same VLAN port to communicate with each other. <br> <br> 23.TagVLAN <br> <br> Used based on IEEE802.1Q VID to divide different VLANs. <br> <br> 24 .. VID (VLANID) <br> <br> VLAN identifier that is used to represent a TagVLAN. <br> <br> 25.MTUVLAN <br> <br> In the switch VLAN configuration, each user of the port and taken uplink .ports into a single VLAN. <br> <br> 26.MAC address aging time <br> <br> Switch the ports with auto-learning addresses function, through the port to send and receive frames of the source (the source MAC address ., switch port number) will be stored in the address table. Aging effect switch time is a learning processParameters. From an address record to start the timing after the address table, if the port within the ageing time is not received source address as the MAC .address of the frame, so these addresses from a dynamic forwarding address table (from the source MAC address, destination MAC addresses and their corresponding to the switch port number) to be deleted. Static MAC address table is not affected by the aging time. address .<br> <br> 27. static address table <br> <br> Static MAC address differences and General dynamic by learning the MAC address. Static address once joined, the address for removal will remain in effect, is not subject to maximum time .-limit of aging. Static address table records the port of static addresses. Static address table in a MAC address corresponding to a port, if configured, all data sent to this address will only be forwarded to that port. Has also become a MAC address .binding. <br> <br> 28.SNMP <br> <br> Basic Network Management Protocol (SNMP, shorthand for SimpleNetworkManagementProtocol) is the OSI 7-layer (layer) protocol for remote monitoring and configuration of network devices. SNMP enables network .management workstation can read and modify gateways, routers, switches and other network equipment configuration values. <br> <br> 29.IGMP (InternetGroupManagementProtocol) <br> <br> Through the use of switches, IP multicast router, support IGMP host to .manage multicast communication. A group of hosts, routers (or switch) and belong to the same multicast group members Exchange multicast streams. And in this group all the devices use the same multicast group address. IGMPSnooping skills, such as the use for video on .demand, a substantial increase in the network application rate. In the network, when used for a variety of multimedia IP multicast communication is executed, you can switch to each port to configure IGMP to reduce unnecessary bandwidth usage. <br> <br> 30 ..IEEE802.1D/STP <br> <br> IEEE802.1D spanning tree Protocol (SpanningTreeProtocol) detected network on loop, the loop automatically disconnect the connection. When you switch between multiple connections, and will only start the most important one, and .the other connections are blocked, the connection becomes an alternate connection. When the primary connection there is doubt, the spanning tree Protocol will automatically use the alternate connection to take over the work of the master connection, no need to any human intervention. <br .> 31.IEEE802.1X authentication protocol <br> <br> Port-based access control protocol (PortBaseNetworkAccessControlProtocol). The protocol architecture is divided into three parts: the client, authentication system, the authentication server. Our management-type switch built- .in 802.1x certification system and the RADIUS client that provides users with advanced billing options. <br>.

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