Questions tagged [ethernet]
For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
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How to enable ip address for all ports in the Cisco IOS Web Browser
Good afternoon, how do i enable the ip address in webui for the cisco switch you can see the picture below ipv4 is unassigned, everything looks good with me.
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If the reported conection speed is 1 Gbps, can the actual transfer speed be lower, or is it guaranteed? [closed]
I've just finished pulling Ethernet cables in one tough track in house, and got "barely 1 Gbit/s". What I mean is that, with a mix of Cat. 5e and Cat. 6 cables (the Cat. 5e was done by an ...
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How can I connect 1000BASE-SX (multi-mode fiber) to 100BASE-TX/10BASE-T (copper)?
How can I connect an optical 1000BASE-SX SFP optical transceiver to a microcontroller (MCU) with 100/10BASE-T? When using a media converter like DP83869 both sides of the link must be configured to ...
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What is an Ethernet Network Switch Port
I am trying to understand what an Ethernet Switch internally considers a single port.
My current understanding is that when a seller advertises an Ethernet Network Switch, like the one below, has five ...
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How do we discover hosts on another subnet without knowing their IP or MAC address
If I have a client who wishes to send a UDP packet to another client, how would I scan for his IP address if Client 2 is located in another subnet?
If I'm trying to discover clients on my own subnet I ...
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Why is a PoE circuit limited to 328 feet?
I'm trying to learn about PoE and a friend told me the 100 meter limitation on a PoE circuit is because of the DC voltage drop on the power channel, not the data. I had understood the opposite, that ...
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Ethernet Basics - Switch Fabric, Managed Ethernet Switch & Virtual PHY terminology
I'm a new member to this community.
I've just started to learn and practice on working with LAN Ethernet PHYs, Switches and other ICs related to Ethernet.
However, I've a few questions where I couldn'...
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What is this coupler for?
Someone asked me if they could split an Ethernet connection with this device. Obviously, it won't work. As far as I know, since Ethernet 10/100 uses dedicated transmit/receive pairs, it shouldn't work ...
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Ethernet: How does receiver know end of frame? [duplicate]
I need to implement an 'ethernet-wannabe protocol' with a sender and a receiver.(only layers 1,2).
Assuming a sender\receiver model for an Ethernet frame with varying payload length.
As for the sender-...
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Which access methods and topologies are used for 10/40/100 Giga Ethernet?
So I'm learning about different Ethernet types and it's stated that the Standard Ethernet operates at Bus/Star and uses CSMA/CD as an access method. The same is stated for Fast Ethernet and Giga ...
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Switch with 100Mbit and 1Gbit ports - using its full capacity
There are switches with mixed-speed ports, usually 24x100Mbit + 2xGbit, looking something like this: .
How are these different-speed switches internally connected? The point is, can you use multiple ...
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MAC address table and frame forwarding on Layer 2 switches - question about when two computers are connected via hub to same switch port
My apologies if this is not the right forum to ask this, but I am a newbie when it comes to networking. I am currently going through the CISCO Networking Essentials course, and one of the Activities ...
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What is the difference between PTP 1588 and 802.1 AS?
What are the use cases where one is preferred over other ?
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Can I use ethernet for point to point communication utilizing broadcast?
Hypothetically if I wanted to make a custom point to point protocol that uses Ethernet, can I use Ethernet in such a way where the two devices communicate with each other by broadcasting their ...
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How does a computer determine that an Ethernet frame contains an IP packet? [duplicate]
So far as I can tell, there is no "Next Protocol" ID at the Ethernet / data link layer.
Nor do IP packets seem to contain any magic numbers for identification purposes.
Does the OS bind each ...
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Why would a 285ft Ethernet single segment work at 100Mbit, but not at 1000Mbit
I am trying to install a 1000Mbit segment that is about 285ft long. It works perfectly fine at 100Mbits, but it won't do 1000Mbit. The testing devices (2 computers, 1 switch) have 1000Mbit ports. All ...
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Router could get packet of size more than 1500 bytes?
Suppose transport layer get the segment 4000 bytes from application layer at sender site. But we know maximum MTU in layer2(Ethernet) is 1500 bytes.
My question is so fragmentation is happening at ...
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Is there an equivalent of the Cisco/ Cisco esque command "ip helper-address a.b.c.d" on Mellanox switches?
Apologies for my newbie question. I have recently had a Mellanox switch added to the mix. I was using an "IP helper-address" to forward DHCP requests in different VLANs to my DHCP server(s) ...
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Physical interface on Cisco Router not forwarding to BDI interface
I think I've outlined the basic interface setup accurately in the diagram.
What I'm trying to do is to run a server on my laptop connected to R2 that is IP'd in the same net as an out of band network (...
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EtherType multiplexing used by LLC layer
What's the type of multiplexing used by Ethernet (LLC layer)?
It says in Wikipedia "The LLC sublayer provides multiplexing mechanisms that make it possible for several network protocols (e.g. IP, ...
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LLC layer: what's the multiplexing principle? [duplicate]
I wonder what is concretly the multiplexing principle done by the LLC layer.
Can you please explain the principle with practicle example ?
Many thanks for your help
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Ethernet compatibility
I am improving my knowledge about the Ethernet protocol. During my study, I noticed that they are multiple versions of the protocol. Example: 2.5GBASE-T and 5GBASE-T and 100BASE-TX.
I wonder depending ...
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Why collision domain occurs in hubs but not switches [duplicate]
if anyone knows the actual point and in depth answer to my question please help. the links in the comments didn't helped at all
Most of the websites which i saw are just vaguely saying that collision ...
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Size of an ethernet frame carrying an arp request using ip (no options) & ethernet?
OKay so I found that this frame has size 72 bytes with no explanation and I can't seem to be able to figure out why .
Ethernet payload will be : ip header + arp packet
Arp packet with ip & ethrnet ...
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ARP Header's Mac Address set to 0 when broadcasting [duplicate]
I'm learning about Ethernet frames and networks and Wireshark has been very useful.
I have a doubt regarding broadcasting and ARP request, since we don't know the Target MAC address, in the ARP's ...
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Pins #6 and #8 of my CAT6 ethernet cable are broken. Should I replace the entire cable or is it usable?
I wired up a ~40m long CAT6 cable following T568B pinout.
According to my tester, pins #6 and #8 are not functional.
I have re-wired both ends several times to make sure it's not my poor crimping; ...
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What are the possible bottlenecks in this design?
I am currently finding myself in a position where I need to design a local network for parallel processing of large amounts of data from multiple sources. Unfortunately I lack the experience to ...
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Noise Immunity - 1000BASE-T vs 100BASE-TX
Comparing 1000BASE-T and 100BASE-TX, given the same cabling and distance, in an environment with substantial electronic noise, theoretically, which of the two will be more resistant to noise?
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How can I use two WiFi routers with one cable to the ISP router?
Let me explain...
There is the fiber optic ISP router on the first floor, connected to it via LAN cable is a switch, connected to the switch via LAN cable is a WiFi router on the 7th.
I want to add ...
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Does MAC replace CSMA/CD in Ethernet?
We now that in old days Ethernet use CSMA/CD for collision domain. However, with the advent of Switches now MAC addresses are used to identify the source and destination machine. But still when I read ...
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How Ethernet protocol is related to Ethernet types such 10BASE5?
I know that Ethernet is a Data Link Layer protocol which specifies how the communication takes place b/w nodes in LAN defined by standard IEEE 802.3. I came across a book in which there were different ...
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Gateway with multiple VLAN IPs on one NIC [closed]
I would like to separate several hosts from the local network and put them behind a firewall. I would like to use VLANs to "physically" separate them instead of using just different subnets. ...
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Creating a distributed ethernet using a single mode fiber ring
Can I create a distributed ethernet using just 1 x core of a single mode fiber ring ?
This is an existing installation, I can't change the following constants:
I have approx 100 locations (nodes) in ...
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Can a radio share a MAC address with the ethernet interface of an access point?
I have a situation where I have found the BSSID to have a MAC address congruent to the MAC address of the ethernet interface.
Is this possible?
Does this happen with all access points?
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Robust Ethernet connection next to high power machines
We are creating a robot for facade treatment (cleaning, painting, drilling). I have few beginner level questions.
An industrial robot with it's controller and our computer is placed at the top of a ...
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Carrier Ethernet - Implementation detail at the UNI needed
Metro Ethernet Forum (MEF) standard number 4 identifies two items of equipment - the UNI-C and UNI-N (UNI Client and UNI Network respectively) - on either side of the UNI. In so far as general terms ...
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Why does an Ethernet cable have four pairs?
I'm curious about why 10Base-T and then 100Base-T Ethernet networks used cables which had four pairs if they only needed two? Were there some cables that only had two pairs?
If we wanted to increase ...
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If one of hub is damaged,will it cause others hub damage too?why can't i enable the rapid dual homing
There is a multi-ring topology, combined with 8 Hubs and 2 switches, i want to ask two questions
1. If H3 is damaged,but the fiber is still ok, will H2 damage too in the future? i have thinking to ...
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Is there a network cable tester device that tests the cables with realistic frequency instead of on/off leds?
I am not looking for a specific product recommendation. I am looking for a category of cable tester devices, so I can do a targeted search.
I have an rj45 cable tester that tests the ethernet cables ...
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Terminology: Disentangling the word 'Ethernet'
I’m trying to disentangle the common usage of the word “Ethernet”
I believe when people say 'Ethernet' they refers to 2 thing simultaneously:
a Protocol
a Transmission Line
That is when someone says:...
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Is there a ping equivalent on layer 2?
You can use ping to measure RTT between you and an IP host and thereby confirm connectivity. Is there an equivalent that can be used on L2/Ethernet with MAC addresses?
i.e. l2ping AA:BB:CC:DD:EE:FF
(I ...
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According to appropriate standards, which Ethernet cable jacket colours should I use? [closed]
We have the following connections.
User desks to patch panel to non-PoE switch
CCTV to patch panel to PoE switch
WiFi access point to Patch panel to PoE switch
Floodlight to Patch panel to PoE switch
...
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Does creating frames done by device drivers?
If I got it right, TCP and IP packets are created normally by software running in the
kernel. So when I as a user open up a socket of type TCP/IP and send a message, the kernel takes care of all those ...
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What is preamble in ethernet frame and why is it used? [duplicate]
I've searched all over the internet and every say that it synchronize the receiver clocks. What does that mean?
Also I've seen another definition that preamble gives NIC time to realize a frame is ...
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Are ethernet connections trackable? [closed]
If I plug into the wall, is it track-able which room the ethernet connection is coming from? If possible, how?
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CSMA/CD: minimum frame size for Fast Ethernet and Gigabit Ethernet
In csma/cd the minimum frame size that should be transmitted in twice the propagation time for the standard Ethernet cable (10 base 2 or 10 base 5) . But how to maintain the same frame size for the ...
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Problems with cat 6 cable
Our company have all the networking with cat 5 cables. My problem is: one of our employees bought a cat 6 cable but we don't have any rj 45 for this cable, we only have for the cat 5. I tried so many ...
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Lan and baseband channel
We know the baseband line at one time send or receive data(half duplex). If more than one host send data at same time may occur collision. In bus topology see the same thing. Inspite this in home, ...
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How do i prevent dataloss, when installing an ethernet cable fairly close to an electric cable? [duplicate]
I want to install an ethernet cable and an electric cable (230V) right next to each other (same cable tube, currently 20mm in diameter, length up to 100m (i think its under 75m but i didn't measure ...
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What type of network cable is this and will CAT6 provide me any benefit over this?
I have a router configured as access point and connecting to the host router with four wire twisted pair cable which looks like below:
I have some doubts regarding this:
What type/sub type of this ...
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