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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1answer
133 views

Is Cisco SG300-10PP & QoS appropriate to share bandwidth?

We're going to let some empty space in our office building soon. The potential client needs an internet connection for their systems (including VoIP).For ourselves we have a resilient ethernet setup, ...
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2answers
163 views

What are the implications of 'saturating' a broadband connection?

We recently switched from a business-class cable connection (100/20) to a symmetrical (100/100) fiber one. This serves a front office, a media department, and several client computers on any given day....
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1answer
211 views

Throttle traffic over a link?

I work for a global company in the client support department. Another department manages the network. My team is frequently asked to throttle client traffic from our on-premises Apple software update ...
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2answers
5k views

Limit bandwidth in cisco router with policy-map doesn't work

I have a problem with my scenario in limiting bandwidth of ubuntu PC in GNS3 with class-map and policy-map. this is my topology in GNS3: The R1 is a cisco 3725 router with c3725-adventerprisek9-mz....
3
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2answers
545 views

Switch bandwidth management

How is bandwidth managed in an unmanaged network switch? Suppose that port 1 is connected to a a very busy server. If suddenly machines connected to ports 2, 3 and 4 decide to send a massive amount ...
3
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2answers
472 views

Network latency and network bandwidth correlation

Today I was pinging random websites, and I decided to ping a website, from which I was downloading at the speed of 2mb/s, and the ping(latency) was 10 ms. My question is, if the answer from the ...
3
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4answers
448 views

How the Internet speed on PCs can be almost 100Mbps although the bandwidth of WAN is 155Mbps?

I thought a bandwidth is a number represent maximum amount of traffic. But it seems not. Let me show the Network map in my company. In this image. WAN has a 155Mbps bandwidth and there are a lot of ...
3
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2answers
1k views

If I UDP multicast to 10 listeners in a multicast group, will my upload bandwidth usage increase by 10 fold?

My internet has an upload limit of 1 Mb/s. If I am in a UDP multicast group with 10 people and I send something to the group at a rate of .1 Mb/s, will my upload rate be 0.1 Mb/s or 1.0 Mb/s? Assume ...
2
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1answer
1k 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 ...
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3answers
2k views

Why is 10Gb SFP+ port showing 4.3Gbps Speed?

I have been trying to diagnoise this problem for a while (slow 10Gb connection). I thought it might be firmware or settings related(MTU). How ever while looking through some SNMP stuff I discovered ...
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2answers
739 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. ...
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3answers
425 views

How can 1000BaseT transmit on Rx & receive on Tx pins?

How can 1000-BaseT (Gigabit ethernet twisted copper pairs) technology transmit over the Rx pins & receive over the Tx pins? It's baseband technology (hence the name), right? Discrete digital ...
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1answer
13k 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 ...
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3answers
4k views

Why can insufficient bandwidth reduce latency?

In this article, it is stated that latency does not affect bandwidth, but insufficient bandwidth can reduce latency. Can someone explain me the latter part of the statement? How would insufficient ...
2
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2answers
109 views

full utilization of bandwidth and its physical significance

I was reading the following extract: A LFN is a network that offers a high bandwidth but also a very high delay. An example could be a satellite connection. These connections offer a high ...
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2answers
566 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?...
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2answers
3k views

How does throttling of network traffic work (to limit bandwidth by ISP e.g.)?

I have tried to find the answer on how network throttling works e.g. by ISP when they limit your access to say 100 Mbps. As far as I know TCP/IP itself does not have any mechanisms for that, so it is ...
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2answers
5k views

What's the difference among bandwidth, ping, ping rate and latency?

All these terms are quite related but I couldn't understand when to use which. I often hear that some networks have low bandwidth and high ping rate for online gaming. I thought they might be ...
2
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1answer
19k views

How to know the interface utilization on a Cisco switch?

I would like to confirm. Is the above below information in bold sufficient to know the utilization of my interface in percentage? Switch#sho int fa0/8 FastEthernet0/8 is up, line protocol is up (...
2
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1answer
725 views

can average througput be greater than bandwidth?

Is it possible for the throughput to be greater than the bandwidth of the cable ?Is it normal to have an average throughput of 10.401 Mbits/s on a cable of 10Mbits/s ?
2
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1answer
3k views

How exactly does “bandwidth” in the Cisco IOS affect network performance?

While troubleshooting a problem that a client reported I came across the IOS interface setting bandwidth. For whatever reason their interface was set to bandwidth 20. I understand that it doesn't ...
2
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1answer
526 views

Where Does TCP overhead factor in when it comes to Wifi speeds?

Is it taken into account by the standards before they give the theoretical maximums per stream, per generation? How could the loss in bandwidth due to TCP overhead be calculated?
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1answer
5k views

QoS bandwith calculation

Please explain: I have two routers with QoS on them.. Both WAN-facing interfaces have a bandwidth command with the same value (100000) but the priority queue (also the other reservations) calculates ...
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3answers
115 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 ...
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2answers
227 views

Finding the available capacity on switch interface in bytes or bits

Below is the output from my "show interface " command PE1.18:01:44#sh interfaces Ethernet 3 Ethernet3 is up, line protocol is up (connected) Hardware is Ethernet, address is 001c.7374.3d95 ...
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1answer
482 views

Do physical wire properties impact the choice between T568A & T568B?

Trying figure out the key differences between T568A and T568B wiring, if any exist. I found claims in a thread that T568A has advantages over T568B due to the fact that each twisted-pair in a cat5/...
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1answer
124 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 ...
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1answer
1k views

How to check the Juniper Switch's port bandwidth?

I use the CoS method limited the EX3300's switch port bandwidth to 200m. But I have a question, how to check whether it works? Is there the Juniper Switch EX3300's switch port have a bandwidth ...
2
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1answer
394 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
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1answer
6k views

Iperf results on UDP Bandwidth

I am currently testing iperf with a view to automating some testing servers for our company. To do this I am using an iperf server in the cloud which is well connected and is only 5 hops away from ...
2
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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 ...
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1answer
84 views

Does link aggregation uses the full bandwidth?

If I setup a 2x 1Gig ports with link aggregation, will I get 2Gigs bandwidth or less? how less? thank you
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1answer
3k views

Time Division Multiplexing and Transmission Rate

According to my textbook, with TDM, each circuit gets all of the bandwidth periodically during brief intervals of time (that is, during slots). If we have a circuit switched network where each link ...
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1answer
2k views

Significance of Bisection Bandwidth, Full Bisection Bandwidth, Subscription and their differences

I am confused by the terms Bisection Bandwidth, Full Bisection Bandwidth, and (Over/Under)-subscription. How do they all relate to one another in Data centres and in the general sense? I believe ...
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1answer
4k views

Understanding bisection bandwidth

I have trouble understanding the concept of bisection bandwidth in high performance computing clusters. Wikipedia article on bisection bandwidth, and online materials say that bisection bandwidth is ...
2
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1answer
258 views

Understanding the effect of transmission rate change in network

Suppose there are 4 switches connected using a normal ethernet cables of speed 100mbps as follows: (S1)---100mbps---->(S2)----100mbps--->(S3)----100mbps--->(S4) Now suppose the link between ...
2
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1answer
2k views

How to Block Torrents Using NBAR

I have a Cisco 1900 Series router running and I have issued whereby clients running torrents take all the bandwidth for their own use while business users suffer the damage. I tried setting up nbar ...
2
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3answers
2k views

Is the bandwidth of cable constrained by its length?

If a certain cable has a bandwidth of 10 mbps, that means in can contain 10 megabytes of data inside it at any given second. However, does this assume some standard length? The analogy I've been ...
2
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1answer
543 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-...
2
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1answer
145 views

Definition of bandwidth capacity for an internet connection

First, I want to test the data rate of a fibre-optic internet connection, but I understand that results are affected by the circumstances of the test, like number of hops between the CPE and the other ...
2
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2answers
247 views

Multi Chassis Ether Channel Best Practice

in our topology we have our Data Server(Multi Virtual Servers) and Backup Server exist in two different buildings and the current connection between them as below: Connection explanation: *1st ...
2
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3answers
727 views

Max bandwidth of wireless access point with gigabit backhaul

I'm looking at setting up a network with full WiFi coverage. Right now I'm still comparing access points to mesh. I see the options for AC access points offer wireless bandwidth in excess of 1Gbps. ...
2
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1answer
3k views

How to calculate propagation speed?

Two routers are connected via ethernet, to find the propagation delay between them, we calculate Distance/Propagation_Speed. How do I find the propagation speed between the two routers?
2
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2answers
566 views

Is there an upper or lower bound of bandwidth given a particular RSS value?

When my computer is in the same place, the RSS (received signal strength) value it receives from my router tends to stay constant at around -60dBM. However, my bandwidth tends to fluctuate a lot over ...
2
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1answer
870 views

Bandwidth Speeds

I have a Cisco Catalyst 6500 with the 720 Supe card. I would like to get the upload and download utilization of a specific port. I would like it from SNMP, I have looked for the correct MIB but no ...
2
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1answer
372 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
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1answer
37 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
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1answer
240 views

Rate limit based on VLAN

My ISP company has some PoPs in remote areas, as shown in diagram. It is currently, it's getting all prefixes from Local IX and getting only a default route from the upstream Internet provider. ...
2
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1answer
444 views

QoS in a small network

I have a small engineering network with a Linux router, LAN nodes on the one side of the router, and a WAN link attached to the router. The WAN link is a 16mbit/s wireless channel, while the LAN nodes ...
2
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1answer
3k views

Limit Internal LAN Traffic and Internet Traffic - Managed Switch?

I have a small business network (192.168.10.x/24) with a pfSense firewall (about 20 hosts: mix of Windows, Macs and Linux machines and printers...). The ISP modem from the WWW connects to the firewall ...