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.
198
questions
0
votes
1answer
47 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 ...
0
votes
1answer
26 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-...
0
votes
0answers
17 views
Why is bandwith-delay product the maximum in-flight datas in TCP? [duplicate]
I have often read, for example https://en.wikipedia.org/wiki/Bandwidth-delay_product that:
The result, an amount of data measured in bits (or bytes), is
equivalent to the maximum amount of data on ...
5
votes
2answers
863 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 ...
0
votes
0answers
7 views
Why is capacity less than bandwidth [duplicate]
I want to know in detail what is the meaning of capacity of a channel ? In simple but technical terms.
Also, For example if the bandwidth of the channel is 100 mbps then why the data rate is less, ...
0
votes
0answers
14 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 ...
0
votes
2answers
58 views
Bandwidth guarantees in packet switching networks
Are there any mechanisms/techniques to implement bandwidth guarantees in packet switching networks?
Thank you!
8
votes
2answers
987 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 ...
0
votes
2answers
133 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 ...
1
vote
0answers
22 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 =...
0
votes
0answers
10 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 ...
0
votes
1answer
478 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 ...
0
votes
2answers
47 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 ...
1
vote
2answers
215 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, ...
1
vote
0answers
24 views
What are the good hardware, software and equipment's suggestions to set up a wireless infrastructure? [closed]
I am working on providing wireless infrastructure suggestions to a client like what software, hardware and equipment will be required to a client in order for them to set up the wireless ...
0
votes
2answers
36 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 ...
0
votes
1answer
48 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 ...
0
votes
1answer
28 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 ...
1
vote
2answers
58 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 ...
1
vote
4answers
188 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 ...
2
votes
3answers
463 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 ...
1
vote
1answer
483 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?
0
votes
2answers
170 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 ...
-1
votes
1answer
32 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 ...
2
votes
1answer
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 ...
1
vote
1answer
69 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 =...
1
vote
2answers
2k 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 ?
0
votes
1answer
81 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
9
votes
1answer
648 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 ...
1
vote
1answer
27 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 ...
1
vote
4answers
185 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 ...
0
votes
1answer
70 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 ...
1
vote
0answers
45 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 ...
5
votes
1answer
184 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 ...
1
vote
1answer
61 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 ...
1
vote
2answers
4k 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
2
votes
2answers
2k 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
2answers
570 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
1answer
179 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 ...
6
votes
1answer
776 views
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 ...
1
vote
1answer
181 views
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 ...
7
votes
4answers
2k views
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 ...
3
votes
1answer
1k views
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 ...
2
votes
1answer
606 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?
0
votes
1answer
84 views
Estimating bandwidth requirements and productivity gain from traffic data
My small office has a 30Mbit/s internet connection, on which two or three people work. We could get twice the bandwidth at a substantial cost.
I imagine a bandwidth upgrade would slightly improve ...
3
votes
2answers
415 views
Spine and Leaf architecture with LACP
In a spine and leaf architecture with Link Aggregation between spine and leaves (active-active) like this:
Do we have the same active-atcive link aggregation between the leaf and the server?
Is the ...
3
votes
4answers
821 views
What is the difference between Ethernet types, considering bandwidth?
Different types of Ethernet (standard Ethernet, Fast Ethernet, Gigabit Ethernet) have different speed of data transfer (10 Mbit, 100 Mbit, 1 Gbit). Why is that?
On the physical layer, the speed of ...
2
votes
1answer
632 views
QOS police vs bandwidth - is this configuration wrong?
I understand bandwidth in QOS is use to guarantee a minimum bandwidth
I understand police in QOS is to set a limit to the maximum bandwidth.
class test_out
police **1608000** 50000 100000 conform-...
1
vote
2answers
142 views
Can large ISPs really offer 1Gb "dedicated" service to every home and business?
Hopefully this is on topic for this site.
While researching synchronous carrier service, so called EDIA or Ethernet Dedicated Internet Access, to a rural location in New Hampshire, USA, I came across ...
1
vote
3answers
122 views
Do throughput rates include corrupt packets? Is throughput = packet loss + good packets or is throughput = good packets?
Normally network devices/software show some kind of current throughput. For example my home router shows the throughput for each connected device in its web interface. Or every web browser when ...
