Question of the moment:
Roguetadhg
Member Posts: 2,489 ■■■■■■■■□□
in CCNA & CCENT
There's two hosts (Windows 7 and Ubuntu) connected to Switch 1. Windows 7 is connected to Port 1; Ubuntu, Port 3. Windows wants to send a packet to Ubuntu...
MAC Addresses:
W7 = 00:00:00:00:00:01
Linux = 00:00:00:00:00:02
The switch was turned off while you connected the machines to the ports. What does the Switch do with the windows packet that wants to goto the Ubuntu machine?
MAC Addresses:
W7 = 00:00:00:00:00:01
Linux = 00:00:00:00:00:02
The switch was turned off while you connected the machines to the ports. What does the Switch do with the windows packet that wants to goto the Ubuntu machine?
In order to succeed, your desire for success should be greater than your fear of failure.
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Comments
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DANMOH009
Member Posts: 241
The W7 machine will look up its CAM/MAC table, this is likely going to be empty, then it will broadcast out all ports. Im not sure if im missing something, is it a trick question? -
atorven
Member Posts: 319
Seeing as the switch was just turned on, and it hasn't learnt the MAC address of the Ubuntu machine so it will flood that packet out on all ports which are in the same VLAN as the Windows machine.
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Kragster
Member Posts: 44 ■■□□□□□□□□
If you want the full detail of what happens, I think this is correct ....
1) Switch checks mac lookup table against source mac (00:00:00:00:00:01)
2) If not there adds entry for Port 1 = 00:00:00:00:00:01
3) Checks destination address against table
4) If not there will flood packet to all ports except the source port
In this case if only port 1 and 3 are connected, it will only send the packet out port 3. If ports 1-9 are connected it would send to 2-9.
The switch will not update the address table for port 3 (Linux 00:00:00:00:00:02) until it receives a packet FROM that port -
WiseWun
Member Posts: 285
Kragster and the others got it right, the switch will flood on all ports except the source port where the frame was originated."If you’re not prepared to be wrong, you’ll never come up with anything original.” - Ken Robinson
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Zartanasaurus
Member Posts: 2,008 ■■■■■■■■■□
atorven has the most correct answer IMO.
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MickQ
Member Posts: 628 ■■■■□□□□□□
I concur with Zartan.
Kragster has the details down, but it's missing the VLAN. An easy one to forget, but Cisco exams mightn't be so forgiving
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Roguetadhg
Member Posts: 2,489 ■■■■■■■■□□
Great! Well, the most important thing about this question was to make people think, even the lurkers
Gotta throw in a random question or two. Just to keep things interesting.
Rep to those that had the gall to respond to the question. Keep it trucking!
Edit: I can't give you more reputation, MickQ. You're just too darn awesome.In order to succeed, your desire for success should be greater than your fear of failure.
TE Threads: How to study for the CCENT/CCNA, Introduction to Cisco Exams
