Cisco CCNA Packet Tracer Ultimate labs: Exam Quiz Questions: Answers Part 1: ARP

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Can you answer the questions?

What are broadcast and collision domains. Can you prove the answers?

A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment or it can be bridged to other LAN segments.

In terms of current popular technologies, any computer connected to the same Ethernet repeater or switch is a member of the same broadcast domain. Further, any computer connected to the same set of inter-connected switches/repeaters is a member of the same broadcast domain. Routers and other higher-layer devices form boundaries between broadcast domains.

This is as compared to a collision domain, which would be all nodes on the same set of inter-connected repeaters, divided by switches and learning bridges. Collision domains are generally smaller than, and contained within, broadcast domains.

While some layer two network devices are able to divide the collision domains, broadcast domains are only divided by layer 3 network devices such as routers or layer 3 switches. Separating VLANs divides broadcast domains as well.

Translation:

Okay so let’s see if we can practically answer these questions. To do that, I’m going to use simulation mode in packet tracer and I’m going to change the filters to only show up an ICMP messages. I don’t want to see all the other traffic types in the network.

So let’s see what happens when PC 1 pings PC4. PC 1 has an IP address of 10.1.1.1 PC 4 has an IP address of 10.1.1.4 So we are going to send ICMP traffic. In other words ping traffic from PC 1 to PC 4 and then we’re going to observe what happens.

Now in this example, I’ll only send 2 packets, in other words two pings. Notice what happens in the network. There’s ICMP traffic but there is also an ARP frame that’s generated. PC 1 needs to learn the MAC address of PC 4. So it sends out an ARP which is a broadcast requesting the target MAC address of PC 4.

So in answer to our first question: What type of packet is sent initially? The answer is a ARP packet which is a broadcast packet.
We’ve proven that, by running simulation mode in packet tracer. Now this is a broadcast and in this network, the devices are connected to a hub. So the traffic should be flooded to all devi ... https://www.youtube.com/watch?v=roeFWYWP674