Questions tagged [ethernet]

For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.

Filter by
Sorted by
Tagged with
0 votes
0 answers
13 views

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.
user avatar
0 votes
0 answers
15 views

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 ...
user avatar
  • 101
1 vote
2 answers
368 views

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 ...
user avatar
  • 19
0 votes
1 answer
36 views

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 ...
user avatar
  • 103
1 vote
3 answers
97 views

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 ...
user avatar
  • 11
2 votes
2 answers
54 views

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 ...
user avatar
0 votes
1 answer
20 views

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'...
user avatar
  • 105
0 votes
1 answer
41 views

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 ...
user avatar
  • 101
2 votes
1 answer
56 views

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-...
user avatar
0 votes
2 answers
58 views

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 ...
user avatar
0 votes
1 answer
32 views

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 ...
user avatar
1 vote
1 answer
325 views

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 ...
user avatar
  • 115
0 votes
2 answers
34 views

What is the difference between PTP 1588 and 802.1 AS?

What are the use cases where one is preferred over other ?
user avatar
0 votes
0 answers
32 views

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 ...
user avatar
1 vote
1 answer
37 views

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 ...
user avatar
  • 113
0 votes
1 answer
53 views

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 ...
user avatar
1 vote
1 answer
66 views

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 ...
user avatar
3 votes
1 answer
141 views

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) ...
user avatar
0 votes
0 answers
40 views

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 (...
user avatar
0 votes
1 answer
118 views

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, ...
user avatar
  • 7
0 votes
0 answers
19 views

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
user avatar
  • 7
0 votes
2 answers
60 views

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 ...
user avatar
  • 7
0 votes
0 answers
27 views

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 ...
user avatar
  • 101
0 votes
1 answer
148 views

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 ...
user avatar
0 votes
0 answers
8 views

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 ...
user avatar
0 votes
2 answers
57 views

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; ...
user avatar
  • 101
0 votes
1 answer
68 views

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 ...
user avatar
4 votes
1 answer
325 views

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?
user avatar
  • 143
1 vote
1 answer
54 views

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 ...
user avatar
  • 11
-1 votes
2 answers
62 views

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 ...
user avatar
2 votes
1 answer
53 views

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 ...
user avatar
0 votes
1 answer
34 views

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. ...
user avatar
0 votes
1 answer
55 views

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 ...
user avatar
  • 101
4 votes
1 answer
477 views

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?
user avatar
0 votes
2 answers
52 views

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 ...
user avatar
2 votes
1 answer
55 views

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 ...
user avatar
17 votes
3 answers
4k views

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 ...
user avatar
1 vote
1 answer
71 views

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 ...
user avatar
0 votes
1 answer
97 views

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 ...
user avatar
  • 103
2 votes
3 answers
96 views

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:...
user avatar
1 vote
3 answers
380 views

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 ...
user avatar
  • 113
1 vote
1 answer
164 views

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 ...
user avatar
0 votes
1 answer
27 views

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 ...
user avatar
  • 137
0 votes
0 answers
20 views

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 ...
user avatar
  • 97
0 votes
2 answers
70 views

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?
user avatar
0 votes
2 answers
224 views

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 ...
user avatar
0 votes
1 answer
56 views

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 ...
user avatar
0 votes
1 answer
77 views

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, ...
user avatar
0 votes
1 answer
36 views

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 ...
user avatar
0 votes
2 answers
108 views

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 ...
user avatar
  • 441

1
2 3 4 5
17