Exam N10-007 topic 1 question 55 discussion

The switch has 12 collisions domains. The hub is connected to the switch, thus its single collision domain is the same as one of these. The two ports router has two collision domains, but one port is connected to the switch, thus is already counted: The correct answer is C

As I can see the Router has 2 collision domains and the switch has 12, that is 14 all together, the hub by itself has 1 but it is on the same collision domain as the switch port that it is connected to. Therefore the answere is 14.

Every piece of hardware on a network has a unique MAC address. This is embedded in the hardware when the product is made in the factory, and the user cannot change it. On a computer, the MAC address is a unique code built into a NIC. <--- googled Question: Does a Hub have its own Mac Address as a network device? If so, perhaps we can find the answer to this question easily...if you add a device ie A switch adds a router to its domain, then you also add the router to, that has 1 collision of itself that's 13...add the Hub to and you can reach 14 since the 'Hub' to some is seen as a 1 collision domain. I stand to be corrected...Hope i helped in some way! OK

Every piece of hardware on a network has a unique MAC address. This is embedded in the hardware when the product is made in the factory, and the user cannot change it. On a computer, the MAC address is a unique code built into a NIC. <--- googled Question: Does a Hub have its own Mac Address as a network device? If so, perhaps we can find the answer to this question easily...if you add a device ie A switch adds a router to its domain, then you also add the router to, that has 1 collision of itself that's 13...add the Hub to and you can reach 14 since the 'Hub' to some is seen as a 1 collision domain. I stand to be corrected...

Every piece of hardware on a network has a unique MAC address. This is embedded in the hardware when the product is made in the factory, and the user cannot change it. On a computer, the MAC address is a unique code built into a NIC. <--- googled Question: Does a Hub have its own Mac Address as a network device? If so, perhaps we can find the answer to this question easily...

Think of a collision domain as a "shared ethernet segment", where only one conversation can occur on a segment at a time. There are 12 unique segments on a 12 port switch. an isolated hub would count as 1 segment because all ports share the segment with each other, BUT the hub becomes a Member of one of the switch's segments when it connects to the switch, so it Doesn't Count as another one. The same goes for the connection to the router. One port is sharing an ethernet with the switch. But the Router has TWO ports, so the second port is on it's own segment (with the ISP presumably). therefore, the total number is 13. It's also fairly well defined in the official CompTIA study guide chapters 3 and 4.

14? No way! The answer is 13!

2 for router 12 for switch and 1 hub equals 13. The answer is C for 13.

Answer should be C. 13. (12 ports with 2 of these being the same link as the hub and one of the router, +1 on the other router port = 13)

It is 13

Its 100% 13. 2 from the router. 12 from the switch -1 for the link between them. Don't count the hub since it doesn't create collision domains.

the fact that they even tell you how many ports are on the router is a major throw off...

instead of me saying port-hub i kept on saying pornhub loool

I stand corrected. didnt count the other port on the router. 13. OBJ-1.3: Based on the description provided, there are 9 collision domains. Each port on the router is a collision domain (2), each port on the switch is a collision domain (8), and all of the ports on the hub make up a single collision domain (1). But, since one of the ports on the router is connected to one of the switch ports, they are in the same collision domain (-1). Similarly, the hub and the switch share a common collision domain connected over the switch port (-1). This gives us 9 collision domains total: the 8 ports on the switch and the 1 port on the route that is used by the cable modem.

The port that connects the hub to the switch is counted as one. do not double count this. The hub is only 1 collision domain no matter how many ports it contains. 1 port is connected from the switch to the hub. this is only 1 collision, not 2. 1 ports on the router connected to 1 port on a 12 port switch(negating 1 collison) one port from the switch is connected to the hub(sharing a collision) as well. 12 collisions is the answer. when one collision is connected to the other, it is counted as 1. so the collision from router to switch. and switch to hub get subtracted and you are left with 12.

Can someone explain this one? I saw what Jay said, but wouldn't that add to 15? Thanks

D is correct, remember that regardless of how many ports a hub has, they are all in one collision domain. However, each port on a switch or router is in a separate collision domain.