LAN NETWORK interview questions (part-2)
More Knowledge is NOT good for health. However, it is given here. You take it or leave it !
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1. What is the voltage levels used in 10BaseT?
In case of 10Base T, +2.5V and -2.5V
In case of 100Base T, three voltage levels are used: +1V, 0v, -1V
1000BaseT uses, five voltage levels, all the four pairs are used, CAT5E cable is used.
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2. What is AUTO-MDI-X?
MDI-X is cross over cable. When you are connecting a switch to another switch, you need cross over cable. if the port is having auto mdi-x facility, then you can use straight cable. The port itself will sense and change over to cross over mode. Normally, if the ports are having this facilty, then it will marked as 1x,2x,3x,etc instead of 1,2,3,etc.
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3. What modulation technique is used in case of 1000BaseT?
PAM
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4. What is the maximum length of cat5 cable between pc and switch?
100 meters.
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5. For wiring RJ45 which standard should be used.T568A or T568B?
You can use either of them for straight cable.
For crossover cable, it is better to use T568A for one end and T568B for the other end.
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6. In the ethernet port of my computer, which pins are trans and which pins are receive?
pin 1,2 is trans. pin 3,6 is receive.
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7. The hub uses star topology or bus topology?
Eventhough, the physical connection looks like star topology, it is logically bus topology.But From exam point of view, always write STAR TOPOLOGY.
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