Questions tagged [bandwidth]
For questions about bandwidth where bandwidth is the amount of data that can be carried from one point to another in a given time period (usually a second). This tag is suitable when your question is about network congestion, speed, throughput and of course low bandwidth problems.
205
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How can I view the bandwidth usage of a specific interface over a period of time on Fortinet without using a FortiAnalyzer instance?
My company utilizes a Fortinet firewall, but we currently do not have a FortiAnalyzer. We are seeking to obtain statistics on the usage of an internet interface's bandwidth, specifically over a 24-...
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59
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Can propagation speed be measured in bits per second?
In networking, propagation speed is usually measured in meters per second. If we knew how many bits fit in a meter we could multiply these values and end up with a measurement in bits per second. Does ...
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2
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4
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149
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Why non-blocking switch needed?
I know that a non-blocking switch is a switch that can manage the sum of the maximum theoretical speeds of all its ports.
However, as the term suggests, "theoretical" maximum speed is just a ...
- 29
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15
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What is the practical use of bandwidth-delay product? [duplicate]
It's given that the bandwidth-delay product defines the number of bits that can fill the link; while the sender can send (1+(2 * Propagation Time / Transmission Time)) units before getting ...
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1
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57
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Why does the data rate change not instantaneously?
I think this is a simple question, but I could not find a clear explanation for this. When I download a file from a browser, torrent, download a game on steam, or just transfer files from disk to disk,...
- 103
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0
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90
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Limit switch interface symmetric bandwidth on a Cisco SG300 switch
I got the job to limit the speed on a cisco 1GBit interface so that the link will have 100MBit symmetric and a burst limit of 1GBit. Its the internet uplink for a customer vlan. I am a bit confused ...
- 79
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1
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79
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When using multicast, all users have same bandwidth?
I'm reading https://ieeexplore.ieee.org/abstract/document/9370130 and in this paper, achievable rate for the uplink transmission from user n to the UAV is
w_n is the bandwidth allocated to user n(...
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2
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283
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Determine network traffic on a switch port in bit/s from Wireshark
I am trying to understand how much data is flowing through a specific port on a Cisco (Stratix) switch. I have set up Port Mirroring so that I can capture the traffic on the target port via Wireshark. ...
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1
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98
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Can total throughput (read throughput + write throughput) exceed the bandwidth of a network?
I was looking at the counters on a machine in production and found that the read throughput was 3.5 GBps and the write throughput was 4.5 GBps ( the counter measures the read bytes and write bytes per ...
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1
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919
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Why would I need fq_codel? [closed]
I've been studying TC for a while.
I came across this answer containing a script.
In it we set the egress limit as:
# setup bandwidth limiting:
tc qdisc add dev "$DEV" root handle 1: tbf ...
- 103
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1
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120
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What is the maximum data throughput of mobile data on the 800MHz range? [closed]
When it comes to auctioning spectrum licenses, I see that spectrums 10MHz wide seem to fetch higher prices (i.e. in South Africa at least - https://www.biznews.com/sa-investing/2020/12/24/telkom-sues-...
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2
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908
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Why are there 11 channels in WiFi communication instead of 3?
I'm a little confused about subdividing the WiFi radio band into 11 channels in the USA, 14 in Japan, and 13 in Europe, and to then use just 3 of them because of the overlapping problem. Why didn't ...
- 63
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0
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29
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LTE NR split throughput among different bands and carrier
Using a mobile device I can measure the throughput in download and upload while connected to an LTE and/or NR mobile cell.
If I know the details of the cells to which the device is connected and so I ...
- 101
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2
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122
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Bandwidth guarantees in packet switching networks
Are there any mechanisms/techniques to implement bandwidth guarantees in packet switching networks?
Thank you!
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2
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1k
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If TCP packets are pre acknowledged, what happens if packets are dropped?
On a VSat link with 800ms RTT latency and 10mbps bandwidth, that means 1MB bandwidth-delay product (data in flight).
According to this useful (but closed) Q/A, packets are injected on both sides of ...
- 873
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2
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1k
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What's the difference between Channel Capacity and Bandwidth?
The definitions of Channel Capacity and Bandwidth I read are exactly the same, so what's the difference between them/their exact definitions?
The Nyquist formula is C = 2 * B * log2 M, so they can't ...
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24
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T_Latency = T_Propagation + T_Transmit + T_Queue? [duplicate]
I am currently learning about the so-called 'physical layer' of a computer network. The following claim is made:
The latency of a message is the total time for the whole message to arrive:
T_Latency =...
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12
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Is there any way to send different data packets together over wireline/wireless link? [duplicate]
I would like to know if there is a technology that allow to send many packets (of different data) together and at the same time over communication link (whether in wireline or wireless networks) of ...
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1
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1
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1k
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Rate vs Capacity vs Throughput vs Bandwidth
I've already referred to this question & all the answers to this question: Bandwidth vs Throughput vs Data(bit) rate
I'm still confused about all the terms especially due to the last paragraph ...
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2
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56
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Can a fast internet connection compensate for a slow server?
If the sever is bottlenecking at 100kB/s with a bandwidth of A, would it bottleneck at any higher speed with a bandwidth of 2A? In another words, can a fast internet connection compensate for a slow ...
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2
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768
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Bandwidth, Latency, Download speed and Upload speed
In the midst of trying to diagnose a slow vpn issue, I'm getting a bit confused by the various metrics being mentioned by the many different techs I've been speaking with.
From what I understand, ...
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2
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95
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what happend when inbound traffics over the limit of bandwidth? [closed]
Sorry for my English.
Let's say there is a chat server in AWS and it has bandwidth limit like 5Gbps. Someday, massive user comes and it spikes a lot of traffic in a second and finally it overs 5Gbps ...
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1
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88
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Why are download and upload bandwidths different? [closed]
If I take any internet connection speed test (e.g. https://www.speedtest.net/) at home then a report is provided which shows different download and upload speeds. Why is this? How is downstream and ...
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1
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29
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Virtual Circuits in a narrow band network
I know that in a broadband network a virtual circuit is established like in an X.25, frame relay and ATM. Is there a virtual circuit established in narrow band network and if yes then how is it ...
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1
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2
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82
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Reconciling multiple definitions of Bandwidth
I am confused about the meaning of the term 'Bandwidth' in a wireless transmission environment. The two most common definitions I could find are:
difference between the upper and lower frequencies in ...
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2
votes
4
answers
431
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why we make each burst of data 2 times the product of bandwidth and delay?
Below is from my textbook:
if we need to send data in bursts and wait for the acknowledgment of each burst before sending the next one. To use the maximum capability of the link, we need to make the ...
- 261
2
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3
answers
977
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How do you calculate required uplink on a Switch? [duplicate]
Lets just say i have an access switch with 8 1G port downlink, and all downlink ports are connected to the users. I want to connect said switch to an aggregation switch.
How do I determine the ...
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1
answer
1k
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TCP Bandwidth and delay guarantees
I was wondering if TCP can provide bandwidth and delay guarantees? Or does it have to implemented on the application layer?
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2
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515
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How could the line rate of T1 be 1.544 Mbps?
T1 signal is the output of a 24-to-1 digital multiplexer whose inputs are 64 kbps each (plus one framing bit).
But a multiplexer is simply an electronic device that selects between several inputs and ...
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34
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What would the bandwidth be while transferring from a machine with a 2.5 Gbps NIC to a machine with a 10 Gbps NIC?
I have two machines connected via a managed network switch capable of supporting 10 Gbps bandwidth.
What would the bandwidth be if I transfer data from machine 1 with a 2.5 Gbps network card to ...
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2
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1
answer
2k
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Worst-case efficiency of PPP escaping mechanism
Will transferring over PPP data stream containing only reserved bytes 0x7E, 0xFF, 0x03 reduce bandwidth by 50% because of escaping?
Then it seems to be very stupid if not say moronic. Such poor ...
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1
answer
95
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Link utilization
I have a topology below (two switches S1 and S2), each interface has two metrics (ifinutilization and ifoututilization).
%ifinutilization = ( (ifinoctets * 8) * 100 ) / ifspeed
%ifoututilization =...
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2
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6k
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Tx and Rx network metrics
Rx means Receive, and Tx means Transmit. I need to know how can i calculate link utilization (Bandwidth utilization) from these metrics ?, do i need to average them or getting maximum ?
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118
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Monitor individual device traffic on Cisco RV042
I am able to monitor Total Traffic consumption on the Cisco RV042 router using SNMP and PRTG.
I want to be able to monitor traffic used by each device on my net
9
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1
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683
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What does bandwidth (digital) really mean?
Recently I came across a new kind of NIC capable of 400Gbps (It kind of blew my mind).
Does it mean it's electric circuitry is capable of serializing/deserializing (SERDES) 400G bits per second of ...
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Streaming Online Video from Home: Bandwidth and Provider Restrictions? [closed]
This is merely meant as a thought experiment, because I reckon it's generally a bad idea with regards to scalability, security, etc., BUT:
Imagine a person wanted to start streaming videos from his ...
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1
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206
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What is the wireless bottleneck speed in my simple network map?
My simple Network topology:
Im trying to figure out what the maximum speed is in mbps on the blue and red links.
The exact specs of the wireless networks are these:
IEEE 802.11b/g/n, 2.4GHz
Dual ...
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1
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4
answers
520
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does fiber optic transmit data as fast as light?
I dont know where to ask this question. So i think its best suited for networking community.
As fiber optic transmit data using light. So we are getting/sending data at the speed of light ??
I did ...
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1
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159
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Bandwidth limit between CPE and Provider Equipment
I have 4 different WAN links for redundancy one of them is 15mbps MPLS and the other ones are 30mbps Internet , 50 mbps Internet and 10 mbps MPLS , the way that it is set up is that we have load ...
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0
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why we need to make the size of our burst 2 times the product of bandwidth and delay? [duplicate]
A textbook which says:
The bandwidth-delay product defines the number of bits that can fill the link. This measurement is important if we need to send data in bursts and wait for the acknowledgment ...
- 261
5
votes
1
answer
315
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Getting lot of unwanted broadcasts on my network
I am pretty new in Networking (noob), while I was monitoring my network using Wireshark, and I found that there is a lot of broadcasts happening all over the network, broadcast on Local network ...
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1
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1
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85
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How to score links in a network represented as graph?
I am working on an academic research about networks. I have proposed my model a a graph that nodes are users with commodity hardware connected to each other via internet as graph links. I know this is ...
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2
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How to measure max bandwidth with Wireshark?
I'm trying to measure the max bandwidth usage of my LAN with Wireshark. I´ve done several packet captures but I don't know how to obtain the max bandwidth usage.
Any Idea?
Thank you in advance
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2
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2k
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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. ...
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2
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582
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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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2
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1
answer
287
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RSVP bandwidth value configuration in Juniper MX
Can someone please explain is it a good practice to change RSVP bandwidth value of an interface?
We have two bundle links between R1 and R2 namely ae13 and ae22 . Both R1 and R2 are Juniper MX ...
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1
answer
961
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Bandwidth limit Cisco 3400 ME problem
I want to limit bandwidth (speed) of interface of Cisco 3400 ME switch.
I did these:
policy-map parent
class class-default
shape average 64000
And in gi0/2 interface I apply it: service-policy ...
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1
vote
1
answer
359
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Bandwidth & shape average combined
Here is a class-map that our provider has configured :
class ce_ef_output
police 2600000
class ce_af1_output
police 5360000
class class-default
bandwidth 592
class class-default
shape ...
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4
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3k
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Can throughput exceed the bandwidth of a network
I took an introductory course to networking this semester and I was wondering:
looking at things at the layer 4 level using TCP can the throughput on the network exceed its bandwidth? According to the ...
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1
answer
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Can I limit bandwidth for certain IP address, subnet or VLAN on Cisco 881?
I have a router with several workstations running on the switched ports. I need to limit their WAN bandwidth. I tried to use rate-limit on Vlan1, but it looks like it had no effect. What is the ...
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