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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.

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Why is the bandwidth of the pre-established reserved link divided on multiple new connections?

I am reading Kurose Computer Networking book 8e, on page number 57, under 1.3.2 Circuit Switching Because it link has 4 circuits, for each link used by the end-to-end connection, the connection gets ...
tbhaxor's user avatar
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1 answer
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iperf3: why do client and server agree on data amount equal but differ on bandwidth?

I want to test a device for its throughput. Therefore, I am using iperf3. After sending data for 10 seconds, my server reports receiving the same amount of data but at a lower speed than the client. ...
Jakob's user avatar
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2 answers
64 views

Different speed between daisy chained switches

What happens with the network link between the PC and Server if the architecture is as follow: If the Client request UDP-traffic and the Server response will be 1Gbps UDP traffic. Would this result ...
Aard's user avatar
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1 vote
1 answer
148 views

Iperf testing- Slow transfer speeds [closed]

I'm doing Iperf testing at my company's branch office circuit and I'm getting results that are causing me concern. I'm testing from a laptop through an access switch>distro switch> Fortigate> ...
Network Engineer Sussman's user avatar
1 vote
1 answer
372 views

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-...
Asma B's user avatar
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1 answer
71 views

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 ...
Nick's user avatar
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2 votes
4 answers
547 views

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 ...
KSMoon's user avatar
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0 answers
16 views

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 ...
SUNITA GUPTA's user avatar
0 votes
1 answer
66 views

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,...
RoyalGoose's user avatar
0 votes
0 answers
114 views

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 ...
MBrain's user avatar
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1 answer
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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(...
new_be's user avatar
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2 answers
403 views

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. ...
Greg Smith's user avatar
0 votes
1 answer
130 views

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 ...
Volatile_volvo's user avatar
0 votes
1 answer
1k views

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 ...
gai-jin's user avatar
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0 votes
1 answer
169 views

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-...
Zach Smith's user avatar
5 votes
2 answers
935 views

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 ...
zazar's user avatar
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0 answers
31 views

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 ...
Oxy's user avatar
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2 answers
136 views

Bandwidth guarantees in packet switching networks

Are there any mechanisms/techniques to implement bandwidth guarantees in packet switching networks? Thank you!
Starfish's user avatar
8 votes
2 answers
1k views

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 ...
Kind Contributor's user avatar
0 votes
2 answers
2k views

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 ...
Ariel's user avatar
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0 answers
25 views

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 =...
The Pointer's user avatar
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0 answers
13 views

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 ...
Lee's user avatar
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1 vote
1 answer
2k views

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 ...
schegu's user avatar
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2 answers
58 views

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 ...
Tripasect's user avatar
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1 vote
2 answers
900 views

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, ...
Silfheed's user avatar
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0 votes
2 answers
109 views

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 ...
the1900's user avatar
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0 votes
1 answer
94 views

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 ...
BaldockJa's user avatar
0 votes
1 answer
30 views

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 ...
Muhammad Ahmad's user avatar
1 vote
2 answers
102 views

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 ...
genesis's user avatar
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2 votes
4 answers
505 views

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 ...
secondimage's user avatar
2 votes
3 answers
1k views

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 ...
Pokekman's user avatar
1 vote
1 answer
1k views

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?
HotWheels's user avatar
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0 votes
3 answers
659 views

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 ...
Noob_Guy's user avatar
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-1 votes
1 answer
34 views

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 ...
gerald1887's user avatar
2 votes
1 answer
2k views

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 ...
Mikhail Karakulov's user avatar
1 vote
1 answer
108 views

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 =...
guidev's user avatar
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2 votes
2 answers
7k views

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 ?
guidev's user avatar
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0 votes
1 answer
122 views

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
Deep Shah's user avatar
9 votes
1 answer
691 views

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 ...
manish ma's user avatar
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1 vote
1 answer
29 views

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 ...
Fedor Alexander Steeman's user avatar
0 votes
1 answer
215 views

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 ...
Casper's user avatar
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2 votes
4 answers
1k views

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 ...
HungryFodder's user avatar
0 votes
1 answer
187 views

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 ...
Kejimire's user avatar
1 vote
0 answers
55 views

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 ...
secondimage's user avatar
5 votes
1 answer
470 views

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 ...
Shx's user avatar
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1 vote
1 answer
94 views

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 ...
Ali Majed HA's user avatar
1 vote
2 answers
8k views

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
ArtFe's user avatar
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2 votes
2 answers
3k 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. ...
iamgr007's user avatar
  • 123
2 votes
2 answers
582 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?...
KenNG's user avatar
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2 votes
1 answer
353 views

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 ...
Nabeel's user avatar
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