Answer / shahin

CSMA/CD (Carrier Sense Multiple Access/Collision
Detection)is media-access mechanism is what keeps networks
running.

If two or more computers transmit data at the same time, we
get data collision. And thus, no data is sent or received.

We have CSMA/CD for both preventing and controlling collisions.

Suppose 4 system connected as on bus topology or connected
on a Hub.

As we know, in Hub one collision domain & one broadcast
domain. More simply, Hub port just copied data wat it
received & paste it on the rest of the port apart from dat
port from where hub received this data.

So how its detects collision...

Before sending any data, Ethernet NIC first test the voltage
of the line. If its normal, i mean voltage level on line its
start sending data. (Specific voltage level value i didn't
remember).

If two NIC test this voltage level at the same time & they
found its normal for start sending data. When they send
data, data will collide somewhere in the line. Hence data
lose occur & delay in communication.

When NIC detects collision, they wait for random period of
time. (Time i didn't remember). After certain time period
they test the line again & if they found normal. they will
start sending data.

Note: CSMA/CD is not used on Full Duplex Ethernet networks.


3rd Question:

As far my knowledge, there is no such specific command for
this. But we can make any full duplex line in to half duplex
also.

Router(config)#interface fastethernet 0/0
Router(config-if)#duplex ?
auto Enable AUTO duplex configuration
full Force full duplex operation
half Force half-duplex operation



Buddy, i can say this much about it. Hope it may help u
little bit..!!!

Thankx for nice question.

What is difference between fast ethernet and ethernet port?

13 Answers   Bank of Baroda, Bank Of India,

---

What is the second best path name of eigrp?

0 Answers  

---

Bridges work at what layer of the OSI model? A.) Data Link B.) Network C.) Physical D.) Application

12 Answers   KVS, PGT,

---

any body can send me CCNA voice simulator practice exam software.

1 Answers  

---

You want to clear the outputs on your serial interface showing errors on the interface. Which command do you type?

1 Answers  

---

Fried i am jitendera here.i donot know this is ccna question or not but i need some help friend i am in love and i donot know how to propose.this is my felling that she also like me but she want that i have to prosed first i am little bit shy boy how cam i propose without risk please answer this question befor any another person propose her please please please

1 Answers  

---

hi friends i have some problem regarding technical round ahr round plz tell me what should the right answer technical questions 1 what is brouter 2 what is the menaing of 10 base2, 10 base 5 and 10baset 3 what is diffrence between bit rate and baud rate. and this question was tooooooooooo much difficult to me that hr said to me that rank me after the taking the all short of interview

5 Answers  

---

Given the following descriptions of layers of the OSI model 1) This layer segments and reassembles data into a data stream 2) This layer manages device addressing tracks the location of devices on the network and determines the best way to move data 3) This layer provides the physical transmission of the data and handles error notification network topology and flow control. Choose the statement that lists the layers in the order described above A. physical data link network B. physical session data link C. data link network transport D. data link transport network E. transport network data link F. transport data link network

2 Answers  

---

What is BGP attribute & How many types of attributes are used by BGP???

5 Answers   Hathway, HCL, Infinite Computer Solutions,

---

10.1.1.0 n/w advertised as /16 from EIGRP & /24 from OSPF which will come in routing table & why

6 Answers   IBM,

---

What is the working of router?

0 Answers  

---

The Internet Protocol (IP) occurs at what layer of the seven layer model? A.) Physical B.) Presentation C.) Network D.) Datalink E.) Session F.) Transport

2 Answers  

---