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Questions tagged [speed]

For questions about network speed. Like bandwidth this tag is suitable when your question is about network congestion, speed, throughput and of course low bandwidth/speed problems.

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why the DOWNLOAD speed is 124 mbps, but the upload only 19.83 mbps? [on hold]

I have a server in Los Angeles, when I use speedtest for testing the network speed. you see the DOWNLOAD is 124.07 Mbps, the UPLOAD is 19.83 Mbps. so, I have two questions: 1. the DOWNLOAD is Server ...
2
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2answers
551 views

Transferring data speed of Fast Ethernet

I am wondering that between 2 hosts in LAN, when i send one file which weights 1Mb versus 1 file weights 0.3Mb from the first host to the second host using TCP/IP protocol, would the latter come first?...
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2answers
96 views

Confused about the results from the cable tester

A little bit of backstory, just in case you want some context. In the last couple of weeks the network at least internally has slowed down. As far as I can tell the only things that have changed has ...
2
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1answer
123 views

What is max speed of WiFi Direct (P2P)?

I'm looking for information on what kind of speeds theoretically can devices connected through WiFI Direct achieve, assuming all devices support WiFi ac?
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2answers
52 views

Data Transmission Rate Video Stream

Given a web-server with an sd-card (storing 720p (7.2 Mbit/s) videos and 800 Mbit/s read-speed) and a wireless interface with 1200 Mbit/s transmission speed. I have to know how many clients can ...
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1answer
45 views

What does the speed of Network Switch actually mean?

Network switches usually come in speeds of 10/100/1000 Mbps, and that's all fine and dandy, then I got thinking.. Suppose I have an 8 port 1000 Mbps switch, each port connected to a client. If a ...
4
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1answer
328 views

Will the data transfer with the destination on the same LAN network be routed through the internet when the WAN IP is used?

I'm planning to set up a Nextcloud locally. I will be using my own domain with a DNS record to connect to my WAN IP and port forward the needed ports to the local machine running Nextcloud. Now of ...
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1answer
457 views

How ISP limits subscriber speed on GPON/FTTH (GPON Architecture technical question) [closed]

What I mean with my question is: every ISP gives each client a X speed, like 100 Mbps, 400 Mbps, etc. In DOCSIS technology, they can set the speed limit on the ISP Router, so I have no doubts how they ...
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2answers
37 views

Network switch simultaneous client-to-client speeds?

If I have a 24-port gigabit switch with no uplink, and the odd-numbered downlink clients are transferring data to the even-numbered downlink clients, will I theoretically have (12 x 1 gigabit) ...
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2answers
41 views

Which component(s) defines the link/connection speed in a network switch?

Suppose that a network switch is a xGbit switch. Which component(s) defines this speed? Is it the switch core? Is it possible to decrease the speed to < xGbits? Perhaps by using an adapter? ...
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1answer
78 views

Cisco 892 Low WAN Speeds [closed]

I'm getting really not-gigabit-close speeds on my Cisco 892 Router. LAN speeds are fine (750-800Mbps) but WAN speeds are awful. I have a PPPoE connection, and when doing a speedtest I get an average-...
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0answers
496 views

Nokia/Alcatel Lucent SAR-8 7705 port utilization

Typically I use the following command to show port utilization percentage: monitor port 1/1/8 rate interval 5 As an example, this would result in the following output every few seconds: ============...
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2answers
3k views

Cisco Router (ISR4221) Throughput - Why so slow?

I'm looking for a new router for a new branch of hour company. I got experience with cisco L2 & L3 Switches but not that much with Routers. I was looking at the ISR4000 series, specifically the ...
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2answers
204 views

Different line attenuation figures for broadband upload and download [closed]

I would be interested to know why the line attenuation figures differ so much for upstream and downstream communication when the same copper/fibre cable is being used for the link to my house? PS ...
2
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1answer
275 views

How does router do traffic control?

I googled a lot about this question, but I didn't find anything useful. If, let's say, the router just drop the packets when the transfer rate exceed the limitation, then there should be TCP ...
4
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2answers
60 views

Better throughput with 100 Mb NIC setting

Ran across something very odd today. Just had a symmetrical 100 Mb circuit installed at a site I’m contracting at. When the NIC is set for auto negotiate for duplex and speed, we only get ~96 Mb down ...
1
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1answer
291 views

Fibre vs Copper short Distance

I am thinking of running Fibre optic from one room to a Nearby ONT/Router, I currently have about 15-20 meters of Cat 6, With a Gigabit UFB internet plan. With a short distance of around 20 meters ...
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1answer
60 views

Can I tie together two cellular connections for more reliable upload speeds?

I don't know that much about network engineering (hence why I'm here) so please bear with me, or point me to somewhere else where I can get help. I want to be able to broadcast a high quality video ...
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2answers
111 views

What does ISP's Internet speed actually mean

Sorry if it's irrelevant for this forum, but I couldn't find any good answers online. I know that "Internet speed" isn't a stable thing, and the rate of getting a something online, for example ...
5
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3answers
164 views

The recommended settings for giga ethernet connected to Ethernet port

What is the recommended duplex and speed configuration for giga ethernet port connected to legacy ethernet (10 mbps) port and there is no available duplex command available on the ethernet side? If ...
1
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1answer
5k views

iperf: send specific volume?

I wanted to test some different test cases. I wanted to transmit 1MB, 10MB, 100MB, ..., 1GB, ... and measure bandwith with iperf. In the manual stands that I can use a combination of -l and -n ...
5
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2answers
944 views

Speed benefits when switching from 1Gb copper LAN to Fiber Optic

We are trying calculate how will the network performance improve when we switch from 1Gb copper LAN to Fiber Optic. We have 5-20 people simultaneously working on a Server via the 1Gb LAN. There are ...
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2answers
2k views

Store-and-forward packet switching delays

My question arose as i was reading Computer Networking a Top Down Approach . The author said the following regarding packet switching: L = length of packet(bits) R = transmission rate(bits/sec) "...
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1answer
19 views

gigabit ethernet adapter [closed]

I'm having a Toshiba laptop and I'm trying to connect it to gig interface on Cisco 1941 router. my Ethernet adapter on my laptop currently is Realtek FE adapter, I tried to upgrade it realtek GBE ...
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3answers
2k views

Calculate max transfer speed in LAN network

We have a LAN network between consumers and producers servers. Producers' output path has been mounted in consumers. There is a 10 Gig switch between producers and consumers and the link between each ...
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1answer
103 views

What binary prefix, JEDEC or IEC, is used for calculating networking gear speed

What is the common practice of calculating a speed of an ethernet enabled device, and which standard (IEC or JEDEC) is used? I'm developing and testing a product that is interconnected via ethernet. ...
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1answer
2k views

What are the capacity and speed of a cable?

In my work, I come across with a cable with TB/s capacity and speed in GB/s. I did some search and found and article from Cisco trying to explain the two terminologies in terms of a water tap. The ...
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1answer
37 views

International download speed problems [closed]

I have 2 servers in Singapore and Canada. Both pass local speed tests of ~100mbit/sec, but when transferring files between them, speeds can be as low as 20kb/sec. The Singapore server can still ...
2
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3answers
780 views

The Speed of Hubs and Shared Collision Domains

I am watching a video course from Brocade. The instructor says that "all devices on a single collision domain must operate with the same speed parameters -- for example, 100 megabits; full duplex. ...
4
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2answers
501 views

Can I increase throughput and decrease network latency by installing multiple NICs?

Is it possible to use multiple NICs and increase throughput and/or decrease network latency? If so, what would be the scaling limit? Thanks,
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1answer
266 views

Limit bandwidth of a particular application [closed]

How to limit the connection (upload and download) speed of a particular application (e.g., a particular exe file) in accessing the internet? Apparently, it is easy to allow or block completely using ...
1
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1answer
216 views

Is bandwidth a sum of network speed each computer in sub network?

I'm not good at English But I really confused about this. I used the word computer but it can be mobiles or any of devices which can have networking. Let just the Internet bandwidth is 100Mbps, ...
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2answers
495 views

Root path cost?

A little confused here. Im trying to determine the root port for SWITCH B. SWITCH C here is the ROOT SWITCH. I understand that to determine the root port you need to find the lowest cost path to the ...
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3answers
436 views

Does the direction of a throughput bottleneck matter?

If a network has a throughput bottleneck, does it matter whether the slow link comes before or after? For example: c wants to send something to h. the bottleneck is on h's side. What throughput ...
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2answers
87 views

Ethernet adapter 100 to 10

We have device that works with 10 Mb. Some of the customers have 100 Mb, so our device causes problems. To change our device to support 100 Mb is going to take time and cost a lot, so is there any ...
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2answers
215 views

Cisco 2900 Default Fast Ethernet Port Speed

What is the default speed of a Fast Ethernet Interface of Cisco 2900 Switch that was just reset to default settings using write erase? I'm asking because my Wireshark capture of ARP packets gives a ...
2
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1answer
26 views

What is the N½ value of a network?

In the context of HPC interconnect networks (Infiniband, OmniPath, ...), I've come across the notion of the N½ value of the network, which is supposedly some performance number. What is this number? ...
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2answers
108 views

Combining Two Networks With Hardware [closed]

My office has two internet connections and two routers and two networks. One network is used for the Internet connect and has great speeds. The second network runs our IP phones and is a backup ...
11
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2answers
3k views

How can a processor handle 10 Gigabit per second or more data rate?

I do not know if it is the right place to ask. It may be a very silly question. I assume that some processor has to process data frames for switching/routing. Modern processors have speed of few GHz. ...
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2answers
2k views

Switch Buffer Sizing

What is the relationship between a switches buffer size and the effect it has on latency? I am aware of the bufferbloat issue and understand that buffers that are too large in networks of slower BW (i....
0
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1answer
159 views

What would be faster between a consumer 1gbps symmetrical Internet connection and a 1gbps data center link to the Internet? [closed]

Say I've got: a home server with a consumer fiber optic Internet connection via FTTH nearing 1gbps downstream/upstream a dedicated server with the exact same hardware specifications in a data center ...
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2answers
74 views

How to leverage a gigabit switch on a network without gigabit devices?

If I have ten servers, each with 100BASE-TX ethernet network cards, and I place a 1000BASE-T network switch between them, all servers are communicating as fast as they can, will the switch be handling ...
3
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1answer
87 views

Faster to slower port speed

I have a network switch that supports up to and including 1000 Mbps. If I have a Client A with 100 Mbps and Client B with 1000 Mbps connection, will: the connection between Aand B be limited to 100 ...
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1answer
186 views

How much influence does multicast and IPv6 have on latency?

I am looking for a fast and a diverse library for my game engine network. I have searched for a while, and I decided to use a simple one because of being fast to understand. I saw there are better ...
2
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1answer
151 views

Estimating latency via distance and betweenness

I want to compute the relationship between delay (latency) with distance and betweenness. More specifically, if I know (let's assume) that the distance and betweenness values for two different ...
5
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2answers
11k views

Switch Fabric Capacity vs Forwarding Rate

What is the difference between Switch Fabric Capacity and Forwarding Rate of a switch? Also, what other types of speed or bandwidth are there for switching?
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1answer
69 views

How to assure where the problem is occurring? [closed]

I actually posted this question yesterday. I'm here to ask you guys again after testing. ↓↓↓First of all, please see my question↓↓↓ My customers told me that the access speed is really slow markedly!...
5
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1answer
117 views

[L4, F/W]How can I deal with SPEED?

I have a problem about Speed when accessing web servers.. [Circumstances] Everything is OK, every packet flows well. However, now I have focused on the speed... That is, connection is ok [Issues] ...
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1answer
333 views

Li-Fi, hardware and software limits

Yesterday, I saw some new articles about Li-Fi. With speeds up to 1 Gb/s it seems like a very renovating technology. Can current hardware and/or software can actually handle this kind of speed? How ...
2
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3answers
3k views

Does Internet speed over cable depend on distance?

Perhaps the question I want to ask is not directly related to discussion subjects over here, but I couldn't find better place to ask. I wanna know how does internet connection speed depend on ...