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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2
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2answers
886 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
580 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
91 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
249 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
42 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
177 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
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. ...
6
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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....
0
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1answer
191 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
81 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 ...
2
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1answer
124 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 ...
1
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1answer
228 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
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 ...
5
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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?
1
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1answer
73 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!...
4
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1answer
130 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] ...
1
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1answer
357 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 ...
3
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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 ...
0
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2answers
453 views

Testing local network speed

We've inherited an existing network that is a mixture of a cat5e, cat6, with switches and rj45 couplers that tie everything together. Is there a way to test a local network speed from one side of ...
3
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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 ...
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2answers
96 views

Building an IDS (Special considerations for speed) [closed]

Background I plan to build a Network Intrusion Detection System, (using a dual-homed desktop pc running Debian and Snort) that will sit between my ISP's router (home LAN) and an additional router (...
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2answers
78 views

Wifi speed 30 fold higher then actual speed coming in from ISP?

My ISP (Internet Service Provider) tells me that my Down speed is 10 Mbps (Megabits per second) and Up speed 1 Mbps. But when I'm searching for a wifi router, the average speed is 300 - 400 Mbps... Do ...
0
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3answers
176 views

If I double ISP speed will it double Wi-Fi speed?

I have a connection of 500Mbps. I clock speeds of 460-480Mbps when plugged in (Ethernet, Cat5e). But when I’m on Wi-Fi (even positioned above the router, 5GHz dual-channel 802.11ac) I clock speeds of ...
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3answers
200 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?
2
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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
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2answers
367 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
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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. ...
4
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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 ...
3
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2answers
775 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 ...
0
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1answer
927 views

What is the maximum data transfer rate on WLAN for data sharing

I had designed an application which will allow me to send and receieve large files on wireless LANs. I am curious to know of the maximum speed that WLAN allows me for transfer.Currently I am using a ...
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2answers
3k views

Can I somehow increase the latency / response time of a server for testing?

I am looking to make some speed performance tests. Normally our server responds within ~25 ms or so, but, I would somehow like to make it answer with delay. So basicly I would like to make some ...
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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?
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1answer
444 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 ...
0
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1answer
2k views

Wireless Adapter Speed effect on Internet Speed

Networking is definitely not my strong point and I have a tendency to waffle on so forgive me. What I am trying to establish is what effect the host and router wireless adapter have on your internet ...
8
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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. ...
2
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1answer
633 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
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1answer
737 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
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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. ...
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3answers
8k views

speed/duplex mismatch between 1000Mb and 100Mb full duplex

need your thoughts on this, i have a switch that runs on 1000mb Full duplex and a firewall with 100Mb Full duplex, is there a possibility traffic wont pass through?
2
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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 ...
10
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2answers
596 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. ...
12
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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 ...
12
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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 ...

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