Linked Questions

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MAC address table [duplicate]

I believe this is a very simple question for you, but a interesting one for me, so I hope I don't mind you with my first question here, noob question. We have two switches. SW1 and SW2. First of all:...
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2answers
90 views

Why does a switch with an incomplete mac address table - sends a broadcast when it receives a frame with an unknown mac address? [duplicate]

Wont it make more sense in term of less congestion to send a multicast to just those interfaces that are not currently in its mac table?
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1answer
77 views

How does router know MAC addresses of computers that are connected to a separate switch? [duplicate]

i am a newbie but i need to understand this ARP thing. In my company we have a router that has 3 switches connected to it. On the switches there are more than 100 hosts. I know that switch learns and ...
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1answer
173 views

How does a switch know out of which port to send a frame? [duplicate]

When a ping passes a switch, how does the switch know which port to send it to?
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0answers
21 views

How are switch tables updated in a multi-switch network? [duplicate]

I have a network structure like the below: Switch A - Switch D / \ Switch B Switch C / | \ / | \ \ 1 2 3 4 5 6 7 Where 1..7 are hosts. If 1 were to send a ...
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0answers
18 views

How do switches learn the neighbour MAC address? [duplicate]

According to the CCNA Official Guide a switch learns the new MAC address by checking the source MAC address of a new frame. Here is the quote: Switches build the address table by listening to ...
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0answers
17 views

Since packets holds next hop MAC address, how does a switch knows to which port to send a packet to a destination? [duplicate]

Lets say a switch has 4 ports : P1, P2, P3, P4 Host A is connected to P1 Host B is connected to P4 If Host A wants to send a packet to Host B, the packet will have as destination address the MAC ...
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3answers
23k views

How does a switch know where to route packet, when there is another switch in front of the destination?

I am just wondering how a switch does know how to route packets to destinations "hidden" behind another switch. In my understanding a switch has a table that maps each of its hardware ports to exactly ...
1
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1answer
4k views

What happens with MAC table in switch when I disconnect some device?

I have found some information about switch MAC table here: How does a switch learn a switch table? . There is explained how switch learns MAC addresses but what happens when I manipulate cables? What ...
1
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2answers
2k views

Does a network switch broadcast local IP Addresses?

Please consider the following scenario The router (Linksys E2000) has an INTERNET port where the main network is plugged in. The router has some ETHERNET/OUT ports where a switch, laptop or PC can ...
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1answer
48 views

Network flooding without ff-ff-ff-ff-ff-ff (layer 2 broadcast) MAC address in destination? [closed]

It appears that a switch is sending the same traffic to all ports in a VLAN: In a Wireshark capture on host 192.168.0.10 with MAC aaaa.aaaa.aaaa I see packets with MAC destination bbbb.bbbb.bbbb and ...
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1answer
36 views

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 ...