For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
-2
votes
0answers
39 views
Is torrent file downloaded using Tor browser is tracable? [closed]
i have the LAN wired network on which torrent sites are blocked (for some reasons). If i downloads a torrent file using Tor browser, will i be traceable ?
-1
votes
0answers
31 views
Tenda N3 Router problem [closed]
The problem started 3 days ago ,when i connect internet via Ethernet cable it works at the usual speed 2.1 Mbps but when i connect it via WiFi it works very slow i have tried upgrading the ...
-1
votes
1answer
46 views
Data Link Messaging Protocol
I have a home network consisting of two PCs running on Windows 7 connected to an Ethernet switch. Is there a way to exchange messages between both PC's referring only to the respective MAC addresses? ...
5
votes
2answers
50 views
802.3x ethernet flow-control on user ports?
What is the best practice for putting 802.3x flowcontrol on a userport and does this inhibit performance if the application/system isn't designed for it?
Eg)
interface gig0/1
flowcontrol receive ...
3
votes
1answer
49 views
What functionality does 802.3bd-2011 actually add to 802.3 Ethernet?
Looking for various documents and the IEEE standards, I can see that 802.3bd-2011 adds a MAC control frame for priority-based flow control. How does priority-based flow control differ from IEEE ...
12
votes
3answers
424 views
What happens when 2 computers transmits at the same time to a 3rd one in a full duplex switch?
Consider the following scenario:
I have 2 PC's (PC1 and PC2) that wants to transmit at the same time to PC3 in a full duplex ethernet switch. Let's consider that all ports are in the same VLAN, so ...
10
votes
4answers
149 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 ...
1
vote
2answers
64 views
Regarding Home Network and Structured Network Panel [closed]
I have a question that maybe pretty simple for those who are little more adept at this. Recently, I've been wanting to get the Ethernet ports around my house (which was built last year) live. I have a ...
13
votes
4answers
227 views
Jumbo Ethernet Frame Deployment
What are some general guidelines for the successful deployment of jumbo frames in a routed environment?
1
vote
1answer
70 views
UDP Message Length Field and Pseudo Header
I'm learning some tcp/ip basics, and am having trouble understanding the Message Length field in UDP. In my book, it says that the Message Length represents the UDP header and data in octets, and ...
6
votes
6answers
164 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 ...
5
votes
2answers
93 views
Difference between LLDP and LLDP-MED
What is the difference between LLDP and LLDP-MED? Is LLDP-MED an add-on to LLDP or something completely different?
4
votes
1answer
84 views
Long Reach Ethernet
In our corporate headquarters we are looking at replacing a 20+ year old phone system and making the switch to VoIP. This is a high rise where we have some limits around options for cabling. ...
-3
votes
3answers
103 views
Problem with Etrade Pro application [closed]
I have this weird problem in office. My boss is using Etrade Pro software for trading online. During office hours (when there is around 20~25 persons connected on the network) the program does not ...
5
votes
3answers
106 views
Monitoring best practice for thresholding errors on an interface?
When monitoring interface errors, what percentage of traffic should you set your 'critical' threshold to according to best practices and does it depend on the interface type (T1, Ethernet etc)? It ...
0
votes
1answer
44 views
Finding the problem spot - Cable Modem vs Cable point itself [closed]
I have new cable modem and moved to a new location. I have Cable point, which attaches itself to the cable modem. Every now and then I realize that my cable modem's either upstream or downstream ...
3
votes
4answers
110 views
How do the different types of materials used in Ethernet cables affect reliability?
There are many metals used in different types of network cables, such as aluminum and copper. Some are expensive and some are cheap. What scenarios constitute the use of these types of different wire ...
8
votes
2answers
118 views
MAC address recycling?
Something I've always wondered about is MAC address exhaustion. Do hardware vendors keep track of MAC address allocation to their platforms, and then subsequently "reclaim" MAC addresses when a ...
7
votes
4answers
185 views
speed/duplex mismatch
How do mismatches occur; what is the impact of a mismatch on network connectivity; is resolution of mismatches really worth the effort; what are some ways to detect mismatches on a large scale?
8
votes
7answers
722 views
Introductory level explanation of VLANs
What's the basic use case(s) for VLANs?
What are the basic design principles?
I'm looking for something like a two paragraph executive summary style answer so I can determine if I need to learn ...
4
votes
2answers
141 views
Why does 1000BASE-T need Auto-MDIX?
A 100BASE-TX PC interface sends out its frames on pins 1,2 and receives frames on pins 3,6. If we connect this PC's NIC with that of another PC we cannot use a straightout cable, because the frames ...
11
votes
3answers
478 views
Are there any reasons to not use BFD?
In looking to implement Bidirectional Forwarding Detection (BFD) it seems to be very flexible in terms of timer tuning, light weight regarding any overhead and it's flexibility in terms of overall ...
4
votes
4answers
151 views
Are multiple links with different VLANs between two switches possible?
I'm not considering Etherchannel or LACP.
Given 2 Ethernet switches A and B, where both switches have port 0 configured as a tagged trunk for VLAN 100 and 101 and port 1 configured as a tagged trunk ...
21
votes
14answers
3k views
How to diagnose a bridging(ethernet) loop?
Given that spanning tree has failed, or you don't have any spanning tree - and get an ethernet loop, what's the best way to diagnose where the problem is ?
Which switch, which cable and so on.
16
votes
2answers
184 views
How to emulate ethernet frame loss for testing purposes?
Maybe I am missing something rather basic, but I don't know so I figured I would ask.
In terms of testing how sensitive various TDMoE are to BER and packet delay I am looking into how to simulate ...
6
votes
2answers
53 views
TDMoE and QoS considerations
As mentioned in the previous question I am looking at sending voice communications over a Metro Ethernet connection shared also by data connections. In addition to the previous question I have this ...
5
votes
1answer
51 views
How sensitive is TDMoE to BER?
We are currently looking at connecting two Asterisk servers across a Metro Ethernet. This leads to a couple of questions I haven't been able to find answers to elsewhere.
The first involves bit ...
7
votes
3answers
186 views
How is the STP root bridge and path to the root bridge determined?
How does STP/RSTP determine which bridge is the root bridge, and how are paths to the root bridge selected ?
