Quick Question from the Book

1. You have 10 users plugged into a hub running 10Mbps half duplex. There is a server connected
to the switch running 10Mbps half duplex as well. How much bandwidth does each
host have to the server?
A. 100kbps
B. 1Mbps
C. 2Mbps
D. 10Mbps

I could swear it was B, but it's not.

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Comments

datchcha

gabrielbtoledo wrote:

1. You have 10 users plugged into a hub running 10Mbps half duplex. There is a server connected
to the switch running 10Mbps half duplex as well. How much bandwidth does each
host have to the server?
A. 100kbps
B. 1Mbps
C. 2Mbps
D. 10Mbps

I could swear it was B, but it's not.

I think it would be D. But will need someone's back up on this answer.

Becuase half duplex is 1-way at a time. Source 1 transmitte, as soon as source 1 is finished transmitting, source 2 will transmitte, and as soon as source 2 is done, sournce 1 will transmitte again.

If it was full-duplex, bandwitdh would still be the same, just bidirectional communication can take place. Transmitte and receive can take place at the same time.

Again, i will need someone's backup on this answer...i could be wrong...

njcowboy

I believe it is 10mb

However, with half duplex, it is shared access CSMA/CD . Since only one person can successfully transmit at one time, it is still 10 mb

If it was full duplex, the throughput would be 20mb with multiple collision domains.

Netstudent

that is a misprint or a poorly worded question. The questoin should have said switch and not hub. a switch is a switch and a hub is a hub, you can't use the same term in the same sentence and say they both behave the same.

networker050184

njcowby is correct I it is 10mbs since only one transmits at a time, but if you know how CSMA/CD works, there will still be collisions, the devices will just be able to recover from them.

gabrielbtoledo

I thought the hub would share the bandwidth among the hosts, therefore 1Mbps for each host.
The answer I got it is D.

njcowboy

gabrielbtoledo wrote:

I thought the hub would share the bandwidth among the hosts, therefore 1Mbps for each host.
The answer I got it is D.

It shares the TIME to use the hub.

One at a time or collisions occur.

The question is worded kind of tricky, but the way I read it, the server is plugged into a switch and and the workstations into the HUB

either way, you still get 10 mbs at half duplex.

tech-airman

gabrielbtoledo wrote:

1. You have 10 users plugged into a hub running 10Mbps half duplex. There is a server connected
to the switch running 10Mbps half duplex as well. How much bandwidth does each
host have to the server?
A. 100kbps
B. 1Mbps
C. 2Mbps
D. 10Mbps

I could swear it was B, but it's not.

gabrielbtoledo,

Which book is this question from?

gabrielbtoledo

Sybex book.

markzab

Well if you want to get REALLY technical none of the answers are 100% correct because they say that on 10mbps half-duplex you're probably only really running at 3-4mbps due to the lines. But obviously they wouldn't have that as an answer along with 10mbps unless they really wanted to mess with you...

Oh wait, it's Cisco.

lex0429

i remember seeing that question in the Sybex book..

the correct answer is 10 Mbps.. When they say "switch" they are talking about the same hub that all the hosts are plugged into.

with a hub you have 1 collision domain and only 1 host can transmit at a time. No matter if you have 2 hosts or 10 only 1 is transmitting at a time so its using all the bandwidth

Rearden

In my version of the sybex book, the wording seems to have changed: "You have 10 hosts plus a server connected to a switch. Each device is running 10Mbps half-duplex. What is the bandwidth available for each device when it communicates to the server?"

The correct answer is 10Mbps

gabrielbtoledo

Hmmm different version maybe?