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Consider that $15$ machines need to be connected in a LAN using $8$-port Ethernet switches. Assume that these switches do not have any separate uplink ports. The minimum number of switches needed is ______
asked in Computer Networks by Veteran (395k points)
edited by | 2k views

6 Answers

+4 votes
15/7=2. ...

SO, ANS 3
answered by Junior (525 points)
+1
is this question for 1 mark or 2 marks?
+3 votes
3 is the answer i think
answered by Active (1.2k points)
0
Yeah, I also wrote 3 :0
0
how much marks for this question?
0
Can you explain how?
+3 votes

.................. . 

Ans = 3

answered by Loyal (9.4k points)
0

@Tuhin Dutta

Plz tell me

what this line means

switches do not have any separate uplink ports

why 1 port interconnected? 

0
It means the links are duplex.
0
If ports are not interconnected how can all machines be connected?
Each and every node is connected to a machine and one single node is for connection to neighbor switch so that all machines are connected.
0
but in our home no switch is interconnected

right?

Ethernet itself can give connection to the machine

isnot it?
0

Yes but here there are 15 machines. Let's give you an example - We have 3 labs Network lab, OS lab, and Programming lab. Each having 5 machines. Now we have to interconnect all of them. here comes the need for a switch. 

FYR please refer below

book Forouzan,  chp Introduction, sub-topic Network Types.

0
yes, I opened forouzan, but didnot find the line

"that switch need to be interconnected itself."

Sorry.

Can u plz mention the line of that book, where u find one extra switch need to interconnect other switches?
+1

There's no such line but for interconnection, we need to connect the switches either by a router or directly using one of their port. Refer below images which are taken from Forouzan,5th edition.

 

The above two images hopefully will clear your doubt.

0
connection with circuit switching

right?
0
Yes correct!
+2 votes
Out of 8 ports 1 port dedicated to the switch itself .hence 7 available ports for the clients.there are 15 clients s no of switches =3
answered by Junior (745 points)
+1 vote
There are 15 devices. And there are 8 ports in 1 Ethernet switch. So it's obvious that one switch is not sufficient. So one more switch is required. So in 1st switch only 7 ports are connected to 7 devices and 8th one is used for connecting to another switch. Now come to second switch. Only 7 ports are left as 1st port is used for connecting to 1st switch. Those 7 ports can be connected to 7 devices. But there are total 15 devices and so 1 would be left. So we need another switch. So now, in second switch we connect 6 devices to 6 ports and last port to third switch. And in the last switch 1st port is connected to 2nd switch and two ports to two left devices.So we require 3 switches in total.
answered by (301 points)
0 votes
3 are required
answered by (11 points)
Answer:

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