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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12
votes
7answers
3k views

Accurate strategy for measuring point-to-point link performance?

I have a requirement to provide an accurate means to demonstrate line performance over a flat layer2 1Gb point-to-point Ethernet circuit, approx 100 miles apart that seemingly goes through a number of ...
12
votes
5answers
2k views

Do faster segments of a network mean faster flow rate or lower latency?

This is another one of those hypothetical questions. I've been trying to figure out whether or not having a faster 'segment' of a network in between host A and host B will translate into a faster flow ...
11
votes
2answers
4k 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. ...
10
votes
2answers
594 views

Ultra-Fast Querying Using UDP Packets

I am implementing a system where one device on a network queries at a very high frequency (hundreds or thousands of queries per second) through sending a small UDP packet with 8 or so bytes of data. ...
8
votes
1answer
2k views

Internet Cable Has Been cut in two and taped back together

Let me explain, we have a two analogue lines (something like 16 pair each, the standard cable that's put into buildings) that come into our building but they pass through the building next door. ...
6
votes
2answers
4k 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....
5
votes
2answers
2k 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 ...
5
votes
2answers
5k 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 ...
5
votes
2answers
17k 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?
4
votes
3answers
221 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 ...
4
votes
3answers
13k views

how to make udp reliable

In a job interview i had faced a question that In my company we always use udp because it is very much fast. and we have reliability also. can u answer how? without adding so much overhead to the udp ...
4
votes
2answers
62 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 ...
4
votes
1answer
343 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 ...
4
votes
1answer
82 views

Internet speed across access points

Hi I work for a small plant nursery that is split into two parts by a street. The main side of the nursery has the majority of the green houses. There is a main switch in the office and from there we ...
4
votes
1answer
129 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] ...
3
votes
1answer
16k 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 ...
3
votes
2answers
939 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,
3
votes
2answers
173 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 ...
3
votes
1answer
176 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. ...
3
votes
3answers
5k 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 ...
3
votes
2answers
772 views

Does both switch and router have to be gigabit for higher speeds?

If you have a gigabit switch connected to non-gigabit router, will the internal network transfer rates be gigabit when the devices are connected to the switch, or will the router also have to have a ...
3
votes
0answers
100 views

How many people share 1 Mbps of an ISP backbone? [closed]

We all know that all consumer based internet connections are shared and that ISPs protect themselves with "best effort" contracts, also we know that a client's 50 Mbps (for example) connection speed ...
2
votes
2answers
363 views

Is the Slow-Start algorithm responsible for ISP speed throttling?

I've been looking up how ISPs manage to cap a user's network speed given the theoretical limit of the infrastructure is usually much higher than the speed ISP's sell. I've stumbled across the TCP slow-...
2
votes
2answers
361 views

Static speed and duplex/no-negotiate causing input error

I noticed gradually increasing input errors for a FastEthernet interface which is connected to an end-user Windows PC. The default setting for all interfaces is no-negotiate. The Foundry switch will ...
2
votes
2answers
206 views

Relationship between full duplex and speed

Full-duplex data transmission means that data can be transmitted in both directions on a signal carrier at the same time. but my question is if we have an interface with 100Mb speed and full-duplex ...
2
votes
2answers
1k views

Fiber to copper conversion, what are the odds?

My ISP says they bring optical fiber to their junction box outside and they bring the copper cable inside from the junction box. And they're promising a symmetrical bandwidth with a speed upto 50MBps. ...
2
votes
1answer
4k views

Full-Duplex and Speed negotiation

I have a server where speed and duplex are set to auto. The NIC supports 1000mb/s, and is connected to my Cisco switch. When I check on port I see that the speed is set to 100Mb/s and Full Duplex. ...
2
votes
1answer
3k views

Find negotiated speed on Cisco router

I am a bit lost. I'm trying to find the physical interface speed that is negotiated on a Gigabit interface on a Cisco 2900 and 3900 series ISR G2. On a switch, I am used to giving sh interfaces ...
2
votes
2answers
569 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?...
2
votes
3answers
1k 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. ...
2
votes
1answer
628 views

Speed of capture packets in monitor mode

I have one doubt about the speed of packets capture in monitor mode. If i have a 300mbps usb wifi adapter in monitor mode, what is the max speed of packet capture? The 300mbps of my adapter is ...
2
votes
2answers
875 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 ...
2
votes
3answers
88 views

impacts of Fiber on a LAN with external copper connection

Would there be any noticeable difference (or any) if one was to use fiber cables for their LAN even if there was a standard copper connection coming into the network?
2
votes
1answer
81 views

Actual Network speed for multi port adaptor

I get confused with speed of adaptors having multiple ports. E.g. chelsio T-520CR is 10Gbits dual port adaptor. Does this means both ports have 10Gbits speed i.e. effective 20Gbits or total speed ...
2
votes
1answer
421 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 ...
2
votes
1answer
3k 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 ...
2
votes
1answer
735 views

Quantify actual vs theoretical network throughput

I'm wondering whether there exists a standard which network throughput could be judged upon. For example: a 100 Mbit/s link has an actual throughput of 80 Mbit/s that given point in time and with ...
2
votes
1answer
123 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 ...
2
votes
1answer
2k views

how to check the speed between 2 switch hub

I have 2 gigabit switch hub both have Green(for 1000 mbps) and Orange(for 100 mbps) indicator lights at each port. the distance between two gigabit switch hub is 100 meters. I use CAT5E outdoor cable. ...
2
votes
1answer
491 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?
2
votes
1answer
41 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? ...
2
votes
1answer
167 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 ...
1
vote
1answer
436 views

Will cutting a 50m CAT6 cable in half achieve a gigabit connection?

I have a new CAT6 cable that's 50 metres long and only performs at 100 megabit. I've tested it in a variety of gigabit ports and it never allows a gigabit connection. Is it the length that's the ...
1
vote
3answers
71 views

How does a NIC know how much data to send?

For example, how does a servers NIC know that the client side is running a fibre optic connection and so it can send more packets down the bandwidth? Like, I'm confused as to how more data comes ...
1
vote
2answers
52 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? ...
1
vote
1answer
502 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 ...
1
vote
3answers
575 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 ...
1
vote
3answers
197 views

How do cable internet providers limit user bandwith?

How cable internet providers limit their bandwith? Are they using SFTP service? If yes, how does all that work?
1
vote
2answers
1k views

What does “rate 10000 cir 0” mean on an alcatel device?

What does "rate 10000 cir 0" mean on an alcatel device? I thought cir ment "committed information rate" but why would it be set on 0 in this example? What does the "rate 10000" stand for?
1
vote
2answers
2k 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 ...