Question { Bank Of America, 23179 }

What are class A, B,C,...

Answer

IP Address is classified into 5 classes
class A Ranges from 1 to 126
Class B Ranges from 128 to 191
class C Ranges from 192 to 223
Class D Ranges from 224 to 239
Class E Ranges from 240 to 254

Class A,B and C are all for normal users like us.
Class D is for multicasting
Class E is for military and Research.

Question { HCL, 10395 }

What is data link layer in the OSI reference model
responsible for?

Answer

Datalink layer is further divided into two sub layers

1. M.A.C.(Media Access Control)
2. L.L.C.(Logical Link Layer)

Here the packets are converted into frames because to
assign meaning to bit and bytes

Main Responsibilities are
1. Framing
2. Physical Adderessing.
3. Flow Control and
4. Access Control

Question { 20761 }

Describe what a VPN is and how it works?

Answer

VPN means Virtual Private Network
Take and example : Our one office is in USA and one in India
We have Hardware VPN over there and installed software VPN
over here in India and implemented the policy file over
here by this way we can connect to US office PC through VPN

Question { Elgi Equipments, 15374 }

What are the important topologies for networks?

Answer

There are five topologies for networks
1. Ring Topology
2. Star Topology.
3. Bus Topology.
4. Mess Topology.
5. Hybrid Topology.

Question { cDot, 18875 }

What is the subnet for a class C network ?

Answer

Subnet of class C Network is 255.255.255.0