All Questions
13 questions
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Enhancing 802.11ac MU-MIMO Efficiency: Simultaneous STA-AP and AP-STA Transmission Impact on Goodput Prediction
In 802.11ac' MU-MIMO two things (it's a XOR) can happen since wireless is half duplex: 1)at the same time more STAs transmit to AP 2)at the same time AP transmits to more STAs. Is this true? If so, if ...
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2
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2
answers
58
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Does Internet access using computers, PCs always require the support of a MAC protocol?
In my opinion, if the link is point-to-point then MAC protocol should not be required. But I am still confused because the question contains 'Internet access'.
0
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2
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155
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Where is priority for a particular frame set?
The Medium Access Control sublayer appends 3 bits for the priority of the frame. The possible choices for the priority are
Traffic Type
Priority
Background
0 (lowest)
Best effort
1 (default)
...
- 31
1
vote
1
answer
536
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How FDB (Filtering Database) is filled out
I would like to understand what is used as a VLAN column in the FDB. For ACCESS port it is PVID if frame untagged or frame VID if frame is tagged, for TRUNK it is allowed VLANs?
We can represent the ...
- 141
1
vote
1
answer
234
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Is TCP aware of MAC adress
lets say I would like to make connection between client and server on port 80. Is 3 way handshake aware of server MAC address? I mean: client send SYN data packet to specific IP:port and MAC. In ...
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1
answer
112
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Is there any fixed version of CSMA/CA?
I was trying to understand exact algorithm for Carrier Sense Multiple Access / Collision Avoidance mechanism from Forouzan's book. The book gives very detail explanation of topics. However explanation ...
- 199
0
votes
1
answer
42
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Broadcast Timer [duplicate]
This question is regarding in the process of L2 MAC Address learning.
As we know, if a sender sends a packet to some receiver host which switch doesn't know, it will broadcast for learning.
Assume an ...
user60007
1
vote
2
answers
1k
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BGP with x2 sessions and x2 L3 VLANs - Please Explain
I am learning about Cisco BGP networking now and came across an interesting situation. In my examples, there was one which suggested that two VLANs were configured on Layer 3 in order to run two BGP ...
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7
votes
2
answers
4k
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Why is RTS/CTS optional for IEEE 802.11?
In wikipedia it is stated:
Request to Send (RTS) frame: The RTS and CTS frames provide an optional collision reduction scheme for access points with hidden stations. A station sends a RTS frame as ...
- 211
0
votes
1
answer
348
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How might I test layer2 latency over ethernet without a target IP address? [closed]
Is there a way, via standard ethernet layer2 protocols, to test latency to a device without using it's IP address?
Background:
I have a fibre "box" provided by my ISP physically connected to my ...
- 103
2
votes
1
answer
78
views
How often does it happen that at the Layer 2 (MAC) an error goes undetected?
I know there are certain error detecting and correcting codes added at the Layer 2. However is it still possible to have errors go undetected eve with the addition of these codes?
What type of ...
- 1,551
1
vote
1
answer
201
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In the MAC acronym what do the words Media, Access and Control refer to independently?
I am not a native English speaker and I know what MAC addresses are and how are they used in networks.
However what I do not understand is where this words came from independently.
What does Media ...
- 1,551
2
votes
1
answer
55
views
Exact trunk operations over an incoming tagged frame
Consider the following example:
H1 --- S1 --- S2 --- S3 --- H2
Hx are hosts, Sx are switches.
Both hosts are connected with access port on VLAN 20 to the corresponding switches, while all the other ...
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