All Questions
86
questions
3
votes
3
answers
996
views
Switch vs Router
Hey I'm kinda new to networking. Forgive the basic nature of the doubt.
Switches, when they receive frames to an unknown destination, broadcast the frame to find the correct destination. Meanwhile ...
- 323
2
votes
2
answers
159
views
Cisco 3570x stack behaviour
Could you please advise on following:
We have two Cisco 3570x switches in a stack (switches have no Stack Power).
What will be the behavior if:
Master switch will be powered off. Will Slave reboot ...
- 163
2
votes
2
answers
2k
views
How can we identify layer two device in a network or what are those device effects on a frame
This is sample of a traceroute to google.com:
TraceRoute from Network-Tools.com to 216.58.194.46 [google.com]
Hop (ms) (ms) (ms) IP Address Host name
1 0 0 0 ...
- 311
5
votes
2
answers
7k
views
How does a layer-2 switch work with UDP?
If UDP and/or TCP send packets via IP to an Internet Protocol Address, how can a layer-2 switch forward these?
Is this possible or do you need a layer-3 switch?
- 634
2
votes
1
answer
310
views
How can fat tree ensure bandwidth?
I'm reading about fat tree and data center topologies, but I have doubts.
To lower cost, "normal" tree is used sharing bandwidth to many hosts. 1:1 is not common, so we see something between 2.5:1 ...
- 177
4
votes
2
answers
3k
views
Is there a way to detect how many switches are between a host and the router?
As switches don't decrease the IP TTL header field, I can't detect how many steps are between a host and the router by using tracert. Are there any ways to detect the number of switches between a host ...
- 249
3
votes
3
answers
12k
views
Native VLAN on a router subinterface (RoAS)
I am aware of all the background information to native VLANs, just to repeat here that they are used for 'control traffic', that is CDP / VTP / PAgP / DTP.
On a router, sub-interfaces can be defined ...
- 43
1
vote
4
answers
4k
views
Accessing devices on different subnets using a switch
I have two devices which come up with default IP addresses:
Device 1 - 192.168.168.168 mask 255.255.255.0
Device 2 - 192.168.1.254 mask 255.255.255.0
I can commonly deduce that both the devices ...
- 123
1
vote
1
answer
4k
views
VLAN Tags and QoS
I have a bunch of phones that are tagged as VLANID 20 with priority 7. I have the router setup with VLAN Tagging as well to mark VLANID 20.
My question in terms of switches. Do the switches need to ...
- 1,015
7
votes
2
answers
54k
views
Enabling flow control on my ethernet NIC
When running "ethtool eth0",
I get a line in the output that states -> Supported pause frame use: No
Does this mean my Ethernet card does not support flow control at all?
I try to enable the flow ...
- 634
2
votes
2
answers
2k
views
Flow Control vs. Storm Control
I am very new to network engineering, I have read through the netgear user manual and find nothing about Global Flow Control (IEEE 802.3x) Mode. Is it different than the storm controls that I have the ...
- 634
5
votes
5
answers
560
views
What blocks a computer from another network in the same switch from answering an ARP request?
Let's suppose I have 3 computers A, B and C connected to the same switch with only the native VLAN active. A and B belong to the same network, let's say that their IP addresses are 192.168.1.1/24 for ...
- 65
1
vote
1
answer
337
views
DTP mode desirable and on
the on mode still negotiable (send/receive DTP) until i set it no negotiate so what is the Difference between on and Desirable.
please give an example :))
- 41
2
votes
1
answer
3k
views
Configuring RSTP and LACP. Unplugging a LACP port causes a topology change and pauses all switch traffic
I am having trouble with configuring LACP and RSTP on a (TPLINK TL-SG3424) switch. If I reboot the VM Server or unplug one of the LACP ports it causes a RSTP topology change that pauses packet ...
- 141
4
votes
2
answers
119
views
Chained wireless links, low network bandwidth
I have a simple L2 network consisting of two chained wireless PtP links.
[LOC A] -------> [LOC B] -------> [LOC C]
.4ms .7ms
Here is a list of the PtP bandwidths:
A -> ...
- 265