a device that bridges network segments, operating at the OSI link layer level.

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45
votes
12answers
4k views

What should I pay attention to when I'm buying a network switch?

Since I'm not a hardware expert, I don't know what features make a network switch a good network switch. What should I pay attention, when I'm comparing the different models from different vendors?
9
votes
3answers
8k views

Server-to-Switch Trunking in Procurve switch, what does this mean?

I am looking to set up switch redundancy in a new datacenter environment. IEEE 802.3ad seems to be the go-to concept on this, at least when paired with a technology that gets around the "single ...
18
votes
6answers
24k views

What are the implications of having two subnets on the same switch?

Can anyone tell me what some of the implications of having two different subnets on the same switch would be if VLANs are not being used?
0
votes
3answers
596 views

What is the difference between a hub and a switch?

I'm sneeking around online store for used stock of hubs, routers and switches for a project I have to build a network infrastructure. So far, I have bought: 1x Cisco 2514 Router; 5x Cisco Serial ...
11
votes
5answers
14k views

The Job and Monitoring Options of RoboCopy

What does the Job Options of RoboCopy do? And what exactly does the /MON and /MOT switches do? How can I use them? I don't understand them, and can't find any examples on how to use them. ...
5
votes
2answers
4k views

How managed switches handle Broadcast Multicast and Unicast?

Under typical scenarios, a network switch needs to handle broadcast, multicast and unicast messages at the same time. I'd like to understand On a typical managed switch (1Gb Ethernet/10Gb Ethernet), ...
3
votes
1answer
66 views

DNS settings on managed switches in LAN

We have a Windows 2008 server that is connected to a managed switch with about 15 Cat5e connections and three fiber branches that go to different parts of campus. At each of these parts there is ...
3
votes
5answers
4k views

Are Arista SFP Transceivers Compatible with Cisco Switches?

Are the Arista SFP transceivers compatible with Cisco switches? For example, if I go to the CDW site they show multiple transceivers that vary in price. How can I know that they will work in the ...
2
votes
1answer
9k views

How compatible are sfp's really?

How compatible are sfp modules between devices. For example, am I likely to be able to plug something like this into a cisco, hp, or other switch with mini gbic ports? ...
0
votes
1answer
237 views

Configuring a RADIUS server for 802.1x over a Cisco Switch

I am trying to set up RADIUS authentication over a Cisco switch and I have gone through every tutorial they have. I am able to get the RADIUS server to authenticate when I access the CLI of the Cisco ...
0
votes
3answers
343 views

Connecting Linux system to switch from 2 interfaces

To get proper redundancy, we've installed 2 switches in our network and connected them to eachother. We now want to hook our servers to both switches. Since all servers have 2 ethernet ports, this ...
65
votes
1answer
9k views

What happens when you plug two sides of a cable to a single networking device?

What is likely to happen when you plug two ends of a network cable to a single switch/router? Will this create problems on the network, or just be ignored?
12
votes
7answers
10k views

How do you keep track of what's connected to your switches?

Currently we manually document the connections to the ports of our switches. Of course, maintenance is a chore, and the documentation is out of date as soon as you save it. Are there any tools for ...
28
votes
14answers
59k views

What is a patch panel?

What is a patch panel? How it is different from (layer 2) switch? EDIT: I think my primary question (and confusion) is this: Why don't network connections go straight to the switch? Don't we still ...
12
votes
3answers
10k views

What's the difference between a switch, a router, and a modem?

What's the difference between a switch, a router, and a modem?
94
votes
9answers
7k views

Can you mount a network switch upside down?

We just took delivery of a new Avaya 2500 48-port switch, that has 24 PoE ports. The problem is that all the PoE ports are on the left-hand size of the switch, and our PoE device cables can only reach ...
22
votes
8answers
26k views

Does using a single cable to connect two switches create a bottleneck?

I realise this may be a stupid question for some, but it's something I've always wondered about. Let's say we have two gigabit switches and all of the devices on the network are also gigabit. If 10 ...
41
votes
6answers
31k views

What is the difference between a managed and unmanaged switch?

I've seen some documentation discussing the use of an unmanaged switch. What is the difference in functionality/performance/etc. between an unmanaged and managed switch?
7
votes
3answers
7k views

Recommended switch for an iSCSI implementation [closed]

We want to implement an iSCSI SAN and all of our testing has shown that we can implement this quite cheaply (Starwind target, refurbished HP Storage array). What concerns me is the throughput/latency ...
16
votes
3answers
2k views

How does network sniffing software work over a switch?

We have several of standard non-managed 3com switches in a network. I thought switches were supposed to only send packages between peers of a connection. However it appears network sniffing software ...
4
votes
5answers
1k views

Decent 1gb switch (16-24 port) for rack

For a rack containing a smaller nubmer of servers (5 at the moment, going to stay in this area), I am looking to replace the currently aging 100Mbit switch with a 1Gb switch. This is for the backend ...
12
votes
5answers
2k views

Small Business Network Switches/General network configuration

We just had one of our many 5-port network switches die on us and it took over a day to figure out what was causing our network problems. So now I have $200 to "fix" our network. Our goal is a ...
7
votes
5answers
9k views

What is the disadvantage to cascading multiple switches?

I have to wire a new office for ethernet and the contractors want to charge atrocious amounts for each line running to each room in the office. It will be much cheaper for me to run a single line to ...
10
votes
4answers
3k views

Is a Network Switch IP-Aware?

I have some very trivial basic questions about networking, but I find varying information on that, so I just wanted to settle this. As far as I understand a Network Switch handles traffic ...
7
votes
1answer
691 views

Are network switch data transfer speed limits per port or per device?

Sorry in advance for the newbie question! When network switches report speeds of say 100 Mbit or 1 Gbit, are they referring to the maximum speed per Ethernet port or is this the physical limit of the ...
4
votes
5answers
8k views

Does a single LACP channel over multiple switches increase redundancy?

I am curious for opinions, findings, or evidence that having multiple interfaces bonded using LACP to ports in multiple switches can increase redundancy. Previously bonded interfaces have always been ...
3
votes
4answers
7k views

Link bonding across multiple switches?

I've read up a little bit on bonding nics with ifenslave; what I'm having trouble understanding is whether there is special configuration needed in order to split the bonds across two switches. For ...
3
votes
3answers
795 views

How many switches? [closed]

im designing a network for a small business. There are three departments in the business retail sales - 80 employees, sale support - 10 employees, accounts - 15 employees. I've decided to use star ...
2
votes
3answers
1k views

Is it possible to capture packets of a Router?

I am facing an issue that some packets sent out to internet from inside network were missing. The pattern we are using is like: Client A ←→ Switch A ← Router A:NAT ← .. Network .. → Router ...
2
votes
3answers
433 views

Ethernet: network topology

Consider a standard GigE network switch. In order to do the switching, presumably it needs to maintain a map of MAC addresses of all things that exist on the network to its (switch's) port numbers. ...
1
vote
4answers
2k views

new Catalyst 2950 switch, no console or telnet CLI access

I am connecting a brand-new Catalyst 2950 switch to my LAN. It is on with green lights, and frames successfully go in and out the ports. The switch is on the same LAN has my host PC, and pings are ...
1
vote
2answers
3k views

What is the command to enable 3rd party SFP+ transceivers on Arista switch?

Does anyone know the command that enables the usage of 3rd party SFP+ on an Arista 7148S switch?
1
vote
2answers
3k views

Best practice to trunk two GB switches?

I already read some similar questions but I still have no clue on how to do it the right way. I have a D-Link DGS-1248T 48 port GB-switch with 4 mini GBIC ports and I want to connect it to another ...
9
votes
2answers
4k views

Is my Cisco switch port bad?

I've been chasing a packet-loss and network stability issue for a handful of end-users on an internal network for the past few days... These issues surfaced last week, however the location was struck ...
8
votes
2answers
505 views

Connecting two devices over 10Base-T Ethernet without a Switch

I am trying to connect two devices one of which is only capable of 10Mbps and does not support auto-negotiation. (The other is a black box, I am unsure how to tell whether it supports ...
6
votes
1answer
530 views

2 ethernet connections between two Switches

I'm setting up servers at our new office and I brought a spare managed switch with 2 Gig ports to run all of our phones(VOIP) and workstations. Now for the servers I've got a separate gigabit ...
4
votes
1answer
259 views

Can I have a class A and class B on same switch?

Is it possible to have both a class A and a class B network on the same switch?
2
votes
1answer
447 views

Managed switch port-based DHCP allocation - general case?

I saw a strange comment bagging IT departments (i.e. sysadmins) on Slashdot the other day: half the time they cant even do a simple thing like provide a jack with a set IP address for us Reading ...
2
votes
3answers
657 views

Switch eliminated collisions. But what about

Sorry for asking pretty simple question. But I don't understand that there are no collision problem with switch... When 3 PC connected with hub, 2 PC trying to connect to other 1 at the same time ...
2
votes
2answers
9k views

How to connect multiple switches together?

I have 4 "NETGEAR ProSafe GS724T Gigabit Smart Switch" that will need connecting to each other. I am not sure of the best way to go about this. Normally, I would just daisy chain them or hook all ...
2
votes
4answers
117 views

routing tables — dell powerswitch 2724

I was hoping to know if there is a way to direct all traffic to a specific url, to the server it corresponds to on our local network with out having to go out into the internet. It would be way more ...
2
votes
2answers
468 views

Extending a subnet

We currently have a private IP subnet using the 192.168.1.0/24 range. We are running out of IP addresses and would like to extend this subnet, to something like 192.168.0.0/21. Is it possible to do ...
2
votes
2answers
6k views

Is using the /3GB statup switch in Windows 2008 x64 only running Sql Server 2008 x64, a good thing?

there's plenty of articles that explain the use of the /3GB startup switch. The general explanation is .. Regardless of the amount of physical memory in your system, Windows uses a virtual ...
1
vote
1answer
964 views

Junos: find out each interface's ip

Sorry if my explanation is confusing. I need to get all the ip addresses of a Juniper Switch and Router (different models). On Cisco IOS I can get that with show ip interface brief | exclude ...
1
vote
1answer
133 views

What router to choose between a 3620 and a 3640 to work with 3500 series switches?

This question is issued from the following: Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? Following the inner requirements, I have searched for a more recent ...
1
vote
1answer
1k views

How to set Mac server to use different Gateway for internet bound traffic

Here is a network diagram of what we have so far: We have recently added a second internet connection that gives better outbound speed for use of offsite backup for our fileserver (Mac Server). I ...
1
vote
2answers
2k views

Failover between 2 catalyst 2960s

We have two catalyst 2960s and four linux servers that we would like to connect to both switches (each server having one link to each switch.) Ideally, we are looking for seamless failover in case a ...
1
vote
2answers
306 views

Should the 3Com NJ225 switch implement the spanning tree protocol?

We recently purchased some 3Com IntelliJack NJ225 switches: The specification states that they support IEEE 802.1D, and a mandatory part of this standard is support for the rapid spanning tree ...
0
votes
1answer
161 views

More than 8 classes in a policy-map - Cisco 3560

It appears I am limited to 8 classes per policy-map. Here is the error message when using the Cisco Network Assistant: The policy "policy-name" contains more than 8 policers, which means it ...
0
votes
1answer
652 views

Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch?

I'm looking forward to build my own network infrastructure, and for that, I have bought a Cisco 2514 router and two Catalyst 3500 series Cisco switches. I have been advised, after the purchase, that ...