Home Network :: Why Used CSMA / CD In Star Topology Switch
Mar 29, 2011
As we know when multiple PCs share same link"line" they will need multiple access protocol like CSMA/CD to protected from collision,,share link like "bus topology" need multiple access protocol "CSMA/CD" but in star topology"switch not hub" PC0 connect to port0 ,,PC1 connect to port1 PCn connect to portn then every PC connect to separate port ,, and the switch mange the network"by using MAC" then why we need to used CSMA/CD in star topology"switch"???
new to networking, I can not fully understand concepts like VLAN, so I would like to know whether it is possible to have a a few VLANs without a switch but over a bridge (created under linux - connecting a few virtual machines).
My cable modem and router are in a closet. From there, wires run through the house to multiple locations. One of the locations has had a wireless access point (WAP) installed which has worked flawlessly. I want to put another device at that location that doesn't have wireless capability, so I tried to connect a switch. The switch does not connect. When I disconnect the cable from the WAP and plug it into the switch, the light on the switch port that would indicate a connection does not come on. When I then connect the WAP to another port on the switch, the light on its port does come on but it does not see the router. I've tried multiple cables (I even tried a crossover cable) and I've tried a second switch with the same result. When I plug back into the WAP, it works fine again. The switch works fine at other locations in the house.
One more thing - When I bought the house, the wire to this particular location was unterminated. I had never done any wiring before but I decided to try to do this myself. So, I read up on the process and bought the necessary tools. When I stripped the wires, I found that the twisted pairs were not just twisted (as they were in the patch cable I practiced on) but each pair was in a single strand of insulation (I'm not sure exactly how to describe this but there were four strands of plastic, each with two wires packaged inside.) I didn't know how to separate the two wires that were packaged together so I wired the connectors with all four color - color/white pairs next to each other. I know that's not the standard. But from what I read, as long as I wired both ends of the cable the same way, everything should work. And in fact, it did for connecting the WAP.
So I am contemplating the setup for the network in my new home, how to connect 24+ ethernet ports in the house to a single network. I was thinking of getting a nice dual-band wireless router, but those usually only come with 4 or so lan ports. How would I then utilize a large 24- or 48-port switch to connect everything to the router?
I am renovation my own house, and I have started to hard wire for the network/s, but I am also trying to incorporate so much more than any previous “wireless” setup I have had, well I am a bit confused to say the least.I would like to set up a home network and media server system which includes:Internet browsing (multiple rooms and wireless) File sharing, printer sharing, scanner etc Music/Video sharing/streaming, TV etc.I have started wiring (we are renovating) with Cat5e, and have just replaced the old POTS (telephone) wiring with Cat5e and taken the individual telephone wires (including the incoming telephone cable) back to one central connection unit in a network patch panel. This has improved the speed of my DSL download connection speed from 1.2mbs to 6.2mbs. unreal!, so that did get me a bit fired up!I am currently wiring data points (Cat5es from each room) back to the same panel, but to be honest I am not really sure where to go from there! Also, I have wired Sat cables back to this point ready to be connected to sat TV (dish) in case if we get it. This patch panel is in a small passageway that goes through to the garage from the house. It is conveniently located next to the mains board which I have just replaced. My original idea was to put any extra needed equipment in the same location, but looking at it, I think that I may have to think again, for there is little room. I have found a small alcove in the upstairs games room which has a shelf, and which could take any hardware, also it will be dust free (unlike the place leading to the garage). I can run as many cables as needed from this location to the patch panel, but obviously I would like to know how many, as I am not familiar with networking on this scale, my only other experience being wireless setups. For example, would the switch need to be located where the patch panel is, or else can it be on the shelf with the other stuff? (away from the panel), and the existing D-link 4 port router?? is this no longer required?Im presuming i will need an old PC or some sort of media storage device here too... no ideas with this either. Have tried asking three different computer stores, got three different answers...?!
Have I dropped a clanger wiring to the passageway, when infact any server/switch or whatever wont be in the same location?Also, I am planning on getting a MAC book, and would like to use this on the system sometimes (might not be relevant), just thought to mention. And, I was thinking of trying Linux, as I am fed up with all the windows problems. But not sure if that is a good idea either.We have TVs in the (when its finished) media room, also three other areas, which I would like to get connected so that they will be able to get either TV or watch a film from storage wow this is getting complicated and if it matters I do have a PS3, which we only really bought to use as a TV storage system/recorder.
Ex: Actually my problem is, i'm using Dlink 8 port switch, and 40 computers connected indirectly to that switch, few times getting issues like packet drops, internet connecting & disconnecting etc. so i want to know either the switch is capable or not.
I have Zyxel Modem configured in bridged mode with static IP from ISP. I want to connect multiple PCs to modem via switch so that each PC use the same configured Public IP address to use the internet. For this (generally) I would need to configure NAT for that IP. But I want to know that will it work under bridged mode or not?
I have 24 port switch which is already connected to internet through static IP. Now I want to use a router as a wireless device to use internet. How do I connect router to switch?
Currently I have the modem into an apple airport extreme, this provides WiFi to the whole house + has a NAS drive connected to it...I have two x box's on the top floor of the house... One is currently wired to one of the airport extremes LAN ports...Now what I am trying to achieve - the second xbox is an old one so needs to be plugged in by cable too... (and I don't want two cables through the house). I have an old Netgear wpn824v2 router. Now so far I plugged the ethernet cable from airport x into one of the lan ports on the Netgear...Then both xboxs are wired into the netgear... The netgear has basically nothing setup on it - no security etc... ip address is on the same network as DHCP router.Netgear has upnp and dhcp disabled...Now stand alone one xbox at a time, the connection is actually faster than I have ever achieved, the full 50mb - but if i wire up my laptop to the netgear and use the internet at the same time the xbox lags like hell, so obviously not tried both xboxs together yet as it will just cause lag!
*modem* ----- wired to --------- -----airport extreme(provides WiFi to house)* ----- Wired to -- -----*NAS drive* --- AND--- -----*top floor to the second router - Netgear* ---wired to --- ----*2 Xbox's
looking to pick a good managed gigabit switch for my central media server implementation.I will have probably 10-12 tvs connected to this along with other things like ip pbx extensions, music streamers, ip cameras etc.Now I can imagine about 2-3 tvs simultaneously streaming HD quality movies. In that case, I am assuming I will need a minimum 150-200mbps throughput switch. Is my assumption wrong?I have been looking at some switches which seem nice and relatively inexpensive but the throughput is much lower than that.If I wouldnt need that kind of throughput then can you explain me how do I come up with my max limit.I initially thought that since its going to be a gigabit switch it would be able to handle that kind of traffic through all its port at once, but I guess thats not a correct assumption. Throughput is what reall dictates simultaneous maximum? Am I correct?
I began having a problem with streaming 1080p content from my media server to a router, wired to a switch that serves a few devices in my home theater (including a HTPC, my Boxee Box). Every 15 seconds movies have to buffer. After a while, I narrowed it down to the switch, since wiring the Boxee Box straight to the router caused the movies to run perfectly.Logically, I thought the switch was the problem, since I really made no changes on my network/DD-WRTRouter other than running a Minecraft server (which shutting that down made no difference in network performance). I ordered a brand new gigabit switch, same problem. Pinging the BoxeeBox returns 0 packet loss whether it's connected to the switch or router, but movies still play perfectly fine when directly connected to the router. Different cables didn't work.
I thought maybe the other devices on that switch were causing some sort of conflict.changed the BoxeeBox's static IP just in-case, unplugged every other device from the switch so that only the BoxeeBox and Router were connected to the switch. It worked fine! Yay! Tried a different cable, still worked fine. Great, I thought, so the problem was never my switch... plugged the old switch back in, then the problem returned. Ugh. Changed back to my new switch (each time power cycling all of the network devices) and the problem persisted, even with the SAME EXACT setup I just had a few minutes previously that worked fine. Tearing my hair out at this point.Since that moment I still haven't been able to reproduce a perfect stream unless the BoxeeBox is directly connected to the router. This doesn't make ANY sense as I had this setup running perfectly fine since November 2010. I am COMPLETELY out of ideas other than running multiple ethernet wires to that drop or running all the other devices on wireless.
Have a home network: 2 desktops & 2 printers wired to router (linksys e4200) Want to add nettalk for VOIP telephone service. All ports on the router are taken. What to do?
on my home network I currently only run an Airlink101 AR675W router. We have a couple issues with this. The router for one is in my basement and there are points in my house that have low signal strength, especially upstairs in the far corners of the home. Second is I am currently running my home PC as a media center but it is set-up wirlessly so streaming is clunky and jittery. Also on this network is 3 X-box's wired, a PS3 running wirless, 2 PC's wired in, 2 wirless laptops and the afore mentioned wirless PC. A lot of weight for the network. What I want to do is move the router upstairs, hardwire it into my wireless PC (the one doing the streaming) and connect a second router (an identical make and model I am buying this weekend) downstairs which will be basically used as an "expansion" of the wirless and a switch for the hardwired devices downstairs. would this be better than simply moving the wirless router upstairs (hardwiring my PC) and putting a 5 or 8 port switch in downstairs for the X-box's and 2 wired PC's there?
1. Green Packet DX-230 WiMAX modem with router 2. D-Link DIR-615 ver G2 (from my ISP) 3. D-Link 8 port desktop switch
I previously used the DIR-615 with my high speed broadband connection. However I had to move to a new house and here I can only get WiMAX. I want to...Place the WiMAX modem upstairs to serve as modem and wireless access point Have the DIR-615 function as the main router and firewall (downstairs) Use the switch to connect all the rooms in my house FYI my WiMAX modem has no connection configurations. I just plug it in and it'll connect automatically to the WiMAX signal. It has 2 LAN ports but no WAN port. From my understanding of networking, I have to turn off DHCP on my WiMAX modem, put it in the same IP range as my DIR-615 (192.168.0.100-199), and disable UPNP and NATPMP. After this I'm stuck.How do I tell my DIR-615 to use the WiMAX modem as it's WAN connection?Should I reserve an IP for the modem in my DIR-615?
Our desktop is connected to a cable modem and I always connected wireless with my laptop. When I changed my linksys wireless adapter I tried to get on the internet and it would not connect to the linksys router, so I then do not know exactly what I did,but the result was that i finally had a connection. That was a month ago and I finally looked at the network mapping after I noticed the desktop was on a lan network and the cable connection was flagged. Apparently, I created something called a switch with the router and now I have a whole new network in my name that has the cable connection.
I plan on starting a high speed LAN for my Gaming LAN party's. We send 100's of GB of data over our LAN networking when we do this, so i need a good switch that can handle the stress of the massive data transfers. It needs to be a gigabit switch and at least 8 RJ45 ports.or is there a different one i should get all together? i cant spend a butt load. url...
i create a network topology ( i attached picture) and i don't know what exactly IP addresses should be assigned to routers and switches + there should be five VLAN's created and just one vlan (vlan 2) must see others vlans (for management purposes) and others vlans should not see each other. So i need that: 1) What IP addresses should be on routers and switches 2) How to create a 5 vlans, that they should not see each other, but one should see all, for example where i have to put "tagged" ports where "untagged" or "not member" ports etc.
i create a network topology ( i attached picture) and i don't know what exactly IP addresses should be assigned to routers and switches + there should be five VLAN's created and just one vlan (vlan 2) must see others vlans (for management purposes) and others vlans should not see each other. So i need that: 1) What IP addresses should be on routers and switches 2) How to create a 5 vlans, that they should not see each other, but one should see all, for example where i have to put "tagged" ports where "untagged" or "not member" ports etc.
how can i connect two offices in the same town.these two offices are separated by two kilometres.each office has ten rooms.how can i provide a secure intranet between the two offices ,what media can be used and hardware to provide a secure intranet via the two offices.
What a yellow star on top of my wifi signal bars mean. It says i have excellent signal but when i put security key in to connect it tells me it cant. My other pcs connect and run with no problems.
After some time LMS stops to refresh network topology (not changing colors for devices which lost/found). However, if I restart topology services devices are refreshed.
Checked the processes. Everything is fine but there is a process named "1018". But I did not found any job with this number.
I need to connect 4-6 laptops in a mesh network topology. What equipment do I need (switches, hubs cable etc..) and how should I create the connection?
We currently support a third party VOIP software. Recently we have had issues with our T38 faxing to our SIP Trunk provider because our FW (sonicwall) doesn't support Nating the connection address within the SDP packet of the T.38 reinvite. This has caused us to look at alternate solutions. I have been in discussion with CISCO sales engineers and can't get a straight answer on which one of their products support this(RFC 3362, T.38 protocol used by our VOIP server)We were looking at replacing our sonicwall with an ASA but it seems it doesn't support RFC 3362 either . However, the sales engineer thinks that their regular routers will. So If I purchase a cisco router, i.e 8xx or 2621XM the question is where do I put it in my current topograpy. Currently we our at a Datacenter and our drop into our cabinet comes right into the Sonicwall and we have all NAT handled there, routing to different LAN ports on the Sonicwall. On LAN side all we have are standard switches supporting all of our Servers.
If I buy a Cisco router to handle my NAT issue for faxing.Do I put it on the WAN or LAN side of my FW?Do I setup the router to handle all of my NATing or just the NATing of my VOIP server that is having issues with the T.38? Would I need a Sonicwall FW if I purchased a CISCO 891?
I have a problem where clients cannot roam between Cisco 1231g-e-k9 and recently installed cisco 1242g-e-k9 access points.. On looking at the CDP option on the 1231 and 1242 access points they are all aware of each other. However if I use the Network View option I see a different picture. All the 1231 access points can see each other but not see the 1242's. Network View on the1242 shows all the 1231's but none of the 1242's. The 1231 are running ver. 12.3(8)JEB and the 1242's are running ver. 12.4(21a)JA1.
I am a beginner, and my customer complaining about the internet connection performance which is very slow, the network description is given below:
Description: The building has four floors and each floor has one mount rack which contains one 26 port switch + 16 port switch. and each floor has 32 pc as well. - 4, Cisco SR2024 un managed switches. - 4, Cisco SR2016 un managed switches. - 1, Cisco access point for internet connection. - 1, Active directory server. - 1, Mail Server. - Internet ADSL connection, 1 MB speed.
This is the current topology.
*Note:The links and cable type "100BASE-TX under Cat 5" among all switches. *Note:Whenever I connect to the main router "Access point" the internet becomes very fast.
When the 4500-E series switch boots and if you issue a 'show run' there's several Star Wars themed references and their revisions. What these actually are and why they are using Star Wars terminology?
Here's the output:
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-ENTSERVICESK9-M), Version 12.2(53)SG2, RELEASE SOFTWARE (fc1) Technical Support: [URL] Copyright (c) 1986-2010 by Cisco Systems, Inc. Compiled Tue 16-Mar-10 04:50 by prod_rel_team Image text-base: 0x10000000, data-base: 0x12794974
1AR1R2-NC1 uptime is 2 years, 2 weeks, 3 days, 15 hours, 44 minutes System returned to ROM by power-on System restarted at 19:29:14 UTC Fri Jun 4 2010 System image file is "bootflash:cat4500e-entservicesk9-mz.122-53.SG2.bin"
I have a Time Warner Cable business class service with no static IP, with a wireless modem which is plugged to a CAT5 distribution panel. On the jacks (2 other rooms on the house) I have a Linksys E3000 and a Linksys Valet router for signal boost and gadgets usage (TV, cameras, etc).The main router (TWC) has it's own external IP which TWC assigns to me and internally distributes via DHCP the range 192.168.0.x. With that said:
- The E3000 has a 192.168.0.6 IP -- this is fixed setup on the TWC router (ubee brand) by MAC address - The Valet has a 192.168.0.7 IP -- this is fixed setup on the TWC router (ubee brand) by MAC address - The main router has the 192.168.0.1 as the gateway and web-interface
Whenever I connect something to the E3000, it is distributing the 192.168.1.x range and the valet 192.168.2.x range.That works perfectly for my home based business until I decided to use more stuff on the network such as a IP printer, IP cameras, etc.
- The IP cameras are connected to the E3000 due to signal strength and I have manually assigned them the 192.168.1.15 and 192.168.1.16 IPs and ports 9001 and 9002.
- The printer is connected to the E3000 and I have manually assigned the IP 192.168.1.30.
Issue 1: Port forwarding On the main router (TWC - UBEE) I have tried to setup a port forwarding by informing the Local IP as 192.168.0.6 (E3000 IP), Internal Port 0, Public Interface IP (0.0.0.0), Ext Start Port 9001, Ext End Port 9001, Protocol - Both, Enabled Yes. On the E3000 I did the same config (screen shot attached e3000.png).This is not working properly. I can't get into the camera.
Issue 2: Printer/ The printer is only accessible if I connect to the E3000 (because it is on the 192.168.1.x network)
Issue 3: How to configure all the devices on the same subnet? If I want everyone to be on the 192.168.0.x network, how to configure properly the E3000 and the Valet? I have tried to force them into the same network but it would not work properly. It would not get an IP from the UBEE router (main).
Here's the layout: Cable modem in the basement. Several devices in which I'd prefer a wired connection in the basement. Upstairs on the 1st and 2nd floor of the house are many devices in which wifi is fine or preferred.Here's the problem: As you might guess, wifi is weak upstairs and certainly on the patio and 2nd floor. I have an access point upstairs that I've experimented with but it is flaky.
