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Questions tagged [switch]

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

Switches (in the context of this site) are devices with multiple network ports, which allow interaction between all devices connected to these ports.

Basic switches operate at the data link layer level (in TCP/IP networks) and forward packets based on the link layer address in the packet headers. They are different to hubs in the way that hubs generally broadcast incoming packets to all other ports, whereas switches keep tables of link layer addresses they have seen at specific ports and only forward packets to the relevant ports. Basic switches are also known as layer 2 devices.

Higher grade switches can include functionality at higher layers of the OSI stack. This can range from IGMP snooping (for multicast support) and VLANs through to NAT, VPN, firewalls or even application layer functionality (web caching or proxying). Such switches are known as multilayer devices.

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Ethernet cable only works A to B, not reversed. Why?

A custom ethernet cable with both connectors wired as T568B only works when connecting A to B, but not reversed, i.e. when switching ends and connecting B to A. A is a Mac, B is a 1Gb TP-Link unmanaged switch. Tried with different Macs and switches.…
elmimmo
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Whether the Speed Auto can have a network speed reach to the switchport top?

My Juniper EX4300 Switch ge-0/0/42 switchport configuration is bellow: admin@1409A# run show interfaces ge-0/0/42 Physical interface: ge-0/0/42, Enabled, Physical link is Up Interface…
three-blocks
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How LAN Switch differentiate a PC/router/anotherSwitch when all its port are the same?

I've been using switch of ages but have no idea how it can recognize which of its port connected to the internet source. I used to think it recognizes the first cable connected to it as the router, but then how can the switch still work after an…
Nhu Thai Sanh Nguyen
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couldn't communicate with windows server 2016 from outside the network, but inside everything is ok

I have some virtual machines on the esxi, such as windows server 2016 and one windows 7 ultimate. On the windows server, I have one active directory and it runs dhcp on it so it has a static ip address which I set. windows 7 ultimate gets its ip…
AMIR HOSSEIN SOROURI
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Hardware Choice: Firewall or Switch Layer 3?

Our network separated into two networks, one behind vintage Cisco Pix 6xx firewall and other one based on Win2008 native firewall?? mainly for media (images/videos). Pix has a limitation of 100Mbit while applications and databases never exceed…
eugeneK
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ZyXEL switch management port configuration

I'm a total newbie in configuring a network switch and I would like to know how can I configure the management port of a ZyXEL switch. I have a ZyXEL XGS3700-24 model and I set an IP address like 192.168.3.X where the web interface answer and I can…
cloud81
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Setting up a Home (LAN) Network

I am trying to setup a basic home network to connect 5 computers. I do not need any internet connection. Ofcourse IP addresses should be either automatically assigned or i should assign them statically. Will buying a 5-port switch and using cat5…
Jasper
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configuring cisco switch sg-300 20 can't change vlan name

I have this very strange issue. Not a biggy because I can do it using the GUI but it still drive me nuts. Just out of curiosity whether anyone has been through this and know the answer to it. It's actually very simple. What I'm trying to do is…
Le Dude
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Why is there flooding on L2 but not on L3?

Why is it, that on L2 (when there is no MAC Table entry for a new packet) there is MAC Flooding. But at the same time on L3 there is an ARP request (when there is no entry in the ARP table for a new packet) and no flooding?
Jimmy88
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Netgear GS724T - all lights are always on

I have a Netgear GS724T "Smart" switch. When I power it on, all the lights come on. I have tried a factory reset, but this has not changed the behaviour of the switch. Has this switch failed, or is this a config issue I can resolve?
dave
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Is HP-2920-24g switch compatible with CHEF setup?

I am using HP 2920-24G switch. In that,I am trying to build the setup for CHEF Client. But it shows error while bootstrapping. Is that HP switch supports CHEF or not?
user237413
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ethernet switch makes network down

I have a D-Link 8-port Ethernet switch which was perfectly working. Since 2 days ago it makes the entire network down. The problem is when I disconnect the cables it runs again and after I connect "the last cable" it goes down again. No matter which…
M Ramezani
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Network Switch Terminology (MAC address table)

When a switch has the ability to learn what MAC addresses each of its ports serves, then uses that to determine which port to send ethernet packets out, what is that feature called? Also, does every switch with that feature also support ethernet…
Jason C
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can power on ethernet for one poe swtich to another layer 2/3 switch?

My question is 1. can we use 1 poe switch as power supply for another layer 2/3 switch? 2. If question 1's answer is yes then What should be maximum distance between those? As per my reading in various websites, distance not more than…
Mandar Khire
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Why do collision may occur if there is duplex mismatch?

In a question on Serverfault It is mentioned that "it is possible for a single host connected to one port to experience collisions if there's a duplex mismatch between the host NIC and the switch port to which it is connected". Is it right. If it's…
Lakmal Vithanage
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