Explain the operation of a VLAN switch. Assume that it conforms to IEEE 802.1Q and include reference to how MA
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A Vlan is a virtual LAN where the switch can be programed to assign ports and/or ranges of IP's to be a part of a specific subgroup of users. This is done to divide communications (imagine that HR on 1st floor does not need to have communications/resources shared with the web developers on the 4th floor). Basically here some good info at Wikipedia...http://en.wikipedia.org/wiki/Virtual_LAN\n\nHope this helps.
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You plug in all the cables and turn it on.\n\nSeriously, if you're asking how to configure it, go buy Cisco support. You'll be glad you did, especially when it needs to be changed at 2am and someone is screaming at you.\n\nThese kinds of boxes are incredibly flexible network devices and they can have all kinds of software, hardware and features installed. They tend to go in above average complexity network situations.
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routers breakup broadcast domains, switches breakup collision domains.\n\nsay you have two networks joined by one router netA & netB. All devices in NetA are in the same broadcast domain, all devices in NetB are in their own broadcast domain. \n\nDirectly connected to each port on the router is a switch. Any devices connected to a specified switchport are in their own collision domain.\n\nfrom http://certcities.com/forums/forum_...p?tid=1441&pn=1\nA broadcast domain is simply an area in which broadcasts can be sent. \n\nfrom http://www.webopedia.com/TERM/C/collision_domain.html\nA group of Ethernet or Fast Ethernet devices in a CSMA/CD LAN that are connected by repeaters and compete for access on the network. Only one device in the collision domain may transmit at any one time, and the other devices in the domain listen to the network in order to avoid data collisions. \nA collision domain is sometimes referred to as an Ethernet segment.
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Yes it is possible to setup vlans on that switch.
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In the telephone network, the pair of wires that connects your phone directly to the nearest box(switch) is called the Local-loop (coz' it's a dedicated pair of wires local to your phone). It's also called the Last-mile. \n\nWhen a telephone operator swtiches to WLL, it essentially means that he repalced your box(switch, and end-point your and many of your neighbours telephone wires) with a Wireless switch. So now your phone would communicate with the switch not using a wire but through air. Rest of the network (beyond the box) is the same.\n\nThis essentially means that you can roam about with your WLL phone within the aerial range of that switch(which now becomes an antenna).\n\nOn the contrary, when, in a Mobile network, you move out of the range of your present antenna, another antenna picks you up. This the reason why WLL is also called a Limited Mobility Mobile system.
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Usually that means that there is something up with the cable modem.\n\nThe first thing is to make sure you cycle the power on the modem every time you switch (between being connected directly to the router, computer 1 or 2). Every time the MAC address changes (for example if you change it from Cable Modem to Router TO Cable Modem to Computer 1) then you need to cycle the power. If you are just unplugging devices behind the router this usually isn't necessary.\n\nNow, any time you reboot the modem wait a minute and reboot the router.\n\nOtherwise, check the lights:\nPower: Should be steady. Blinking usually indicates a hardware failure or that standby is on.\nSend and/or Recieve Light(s): Should be blinking rapidly when plugged in to a device. Slowly or solidly can indicate a problem with your network cable or modem.\nCable: Should be solid. Blinking slowly or off indicates a problem with your cable connection (usually physically) or modem.\nPC/Activity: Should be blinking fast or solid. Blinking slowly or off indicates a problem with the modem, the cable between the two or the device plugged in.\nStandby (if applicable): Should be off. On or blinking indicates that it is in standby mode. Some modems remember this even when power is cycled.\n\nIf all the lights blink in sequence, stay on or stay off the modem is usually shot.\n\nHope this helps!\n\nEDIT: From the manual:\n\n"Light -Turns Off During Startup- If Turns Off During Normal Operation If\nReceive- The receive channel cannot be acquired - The receive channel is lost\nSend - The send channel cannot be acquired - The send channel is lost\nOnline - IP registration is unsuccessful  - The IP registration is lost\nPower - The cable modem is not properly plugged into\nthe power outlet\n -The cable modem is unplugged or is in standby\nmode. Press the Standby button"\n\nAlso:\n"f the solutions listed here do not solve your problem, contact your cable service provider. Before calling your service provider, try one of:\n• Unplugging and plugging in the cable modem power cord to restart the cable modem\n• Pressing the reset button on the rear panel\nRestarting or resetting the cable modem may take 5 to 30 minutes. Your service provider may ask for the status of the front-panel lights as\ndescribed in “Front-Panel Lights and Error Conditions” on page 44.\n\nProblem Possible Solutions\nGreen POWER light is off - Check that the power cord is properly plugged into the electrical outlet and the cable modem.\nCheck that the electrical outlet is working.\n-If the Standby light is on, the Internet connection is off. Press the Standby button to reconnect to the Internet."
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You use a console connection to configure  a network equipment.
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It's tough to explain without your router model.  Basically, you sign on to your router through your internet browser, go to the wireless settings section, enable WPA encryption, enter a password, save, and then reconnect to the router by entering the password on your computer.\n\nThe best thing to do is to go to the website of the manufacturer of your router and see if they have a good walkthrough.\n\nThis is the only site I found that would make any sense at all to a beginner:\nhttp://www.pcworld.com/printable/article/id,115066/printable.html
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I assume you don't actually want a technical explanation of how they actually work, right (I couldn't tell you if you did, I'm afraid) But what I can tell you is:\n\n1) A switch is a device that sits at the middle of a small network of computers, it allows any one computer attached to the switch to commnicate with any other\n\n2) A hub is like a switch, only cheaper and worse (in a hub only two computers can be communicating at any given time, whereas in a switch many compuetrs can talk simultaneously)\n\n3) A router is a switch that has extra hardware in it that allows it to be connected directly to the internet as a Gateway, so any computer connected to it can access the internet.\n\nIf you have a switch, then you need to get one computer to be the gateway, it connects to the internet, and the other computer connects to it via teh switch. Essentially one of the computers is acting like a router. If you have Windows this is a fairly simple thing to set up, you don't even need extra software. (Send me a mail via my profile if you want detailed info, since I really don't want to go thorugh step by step instructions when for all I know you're using Linux or something)\n\nIf you have a router, it's much easier. Make sure the router can connect to the internet connection type you've got (i.e. You may need a different type of router for an ADSL connection than for a Cable connection), then you connect both computers to the router, connect the router to the internet, and that's pretty much it, apart form actually configuring the router...
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If you're getting the question when you're configuring the router, it is asking you to make up a WEP.\n\nIf you're getting the question when trying to connect a wireless computer to the router, then you have to log on to the router from a hardwired connection, go into the configuration, and look to see what the WEP is.
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same as you do in simple LAN environment but make sure that both nodes are connected to the ports that are defined in vlan.
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This is true.  MAC Addressing is at Layer 2, and MAC addresses control how one packet gets to the next piece of hardware, the next hop.\n\nFor instance, when a router receives a packet, it determines the next hop based on it's IP lookup table for the destination IP.  It then writes the MAC address of the next hop into the packet's destination address, puts it's own MAC address in the packet's source address, and then submits the whole new packet out on the correct interface.\n\nOf course this implies Ethernet type network is used from source to destination, when many different network types could have been used on the way.
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A bridge basically connects two (and only two) networks.\nhttp://www.erg.abdn.ac.uk/users/gorry/course/images/bridge-1.gif\n\nA switch can connect two or more networks.  Unlike a hub which broadcasts a packet to all attached networks, a switch filters traffic to the appropriate destination.\nhttp://www.erg.abdn.ac.uk/users/gorry/course/images/switch-uni.gif\n\nThey both operate at the data link layer, working through MAC addresses to determine whether or not to forward traffic.  They should not be confused with routers which are network layer devices, forwarding packets using the IP protocol.
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router - this is often a bundle of services for building a local area network.  It will contain a gateway or bridge to an internet service provider, and contain a switch for internet sharing.  It will also contain a DHCP server, which assigns IP addresses to devices on the LAN/\n\nswitch - an Ethernet switch works like a hub, but automatically configures that port for the IP parameters that is needed by that port.   So if you are using a cross-over cable to connect to a computer, the switch will automatically cross-back, so it works.  This is the NO BRAINER HUB.\n\nhub - a network hub connects various devices to a network.  But it is a dumb device, so it is up to the user to plug in the proper patch cable or cross-over cable.\n\ngateway - in general, a gateway is a device that connects a local area network to a wide area network or internet service.\n\nbridge - this is a general term to describe the connection of multiple devices and protocols to direct network communication.\n\nAs you can see, a router does it ALL.  I recommend that you use a high speed switch if you want to expand the number of ports that your router provides.  \n\nOH RATZ....  I started fooling around with this stuff at a whopping 5MHz back in 1983 for the stock exchanges.  I rewrote some TCP/IP protocol stuff before most geeks ever heard of it.   It was all Digital Equipment and Intel that were banging heads in those days. \n\nGood luck and Happy Computing!
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Very briefly, antena, radio, router, power supply, processor, firmware/software.  A little more detailed... The antenna receives and transmits RF energy.  The power supply typically converts your 120VAC and provides the needed DC power levels to the internal components.  The 802.11a/b/g radio itself consists of various sub-components such as mixers, filters, oscillators, detectors and the electronics that connect them all.  The router processor consists of whatever router chipset is in use and implements TCP/IP and Ethernet.  There will also be some on-board flash (for saving image and config) and DRAM.  There will also be firmware/drivers for the 10/100 RJ45 physical interface for example.  There is also other firmware/software that gets loaded such as a management interface so you can configure it.  There may also be an internal POST component for bootup diagnostics.
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check this link: http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_data_sheet09186a0080091b09.html
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Layer one the physical layer\n\n\nHome > Quick Reference  \nThe 7 Layers of the OSI Model\n\nThe OSI, or Open System Interconnection, model defines a networking framework for implementing protocols in seven layers. Control is passed from one layer to the next, starting at the application layer in one station, proceeding to the bottom layer, over the channel to the next station and back up the hierarchy. \nApplication\n(Layer 7) This layer supports application and end-user processes. Communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified. Everything at this layer is application-specific. This layer provides application services for file transfers, e-mail, and other network software services. Telnet and FTP are applications that exist entirely in the application level. Tiered application architectures are part of this layer. \nPresentation\n(Layer 6) This layer provides independence from differences in data representation (e.g., encryption) by translating from application to network format, and vice versa. The presentation layer works to transform data into the form that the application layer can accept. This layer formats and encrypts data to be sent across a network, providing freedom from compatibility problems. It is sometimes called the syntax layer. \nSession\n(Layer 5) This layer establishes, manages and terminates connections between applications. The session layer sets up, coordinates, and terminates conversations, exchanges, and dialogues between the applications at each end. It deals with session and connection coordination. \nTransport\n(Layer 4) This layer provides transparent transfer of data between end systems, or hosts, and is responsible for end-to-end error recovery and flow control. It ensures complete data transfer. \nNetwork\n(Layer 3) This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. Routing and forwarding are functions of this layer, as well as addressing, internetworking, error handling, congestion control and packet sequencing. \nData Link\n(Layer 2) At this layer, data packets are encoded and decoded into bits. It furnishes transmission protocol knowledge and management and handles errors in the physical layer, flow control and frame synchronization. The data link layer is divided into two sublayers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. The MAC sublayer controls how a computer on the network gains access to the data and permission to transmit it. The LLC layer controls frame synchronization, flow control and error checking. \nPhysical\n(Layer 1) This layer conveys the bit stream - electrical impulse, light or radio signal -- through the network at the electrical and mechanical level. It provides the hardware means of sending and receiving data on a carrier, including defining cables, cards and physical aspects. Fast Ethernet, RS232, and ATM are protocols with physical layer components. \n\n\n\n\n\nThis graphic is taken from The Abdus Salam International Centre for Theoretical Physics.