21- What is OSI?
Open System Interconnection. t was first name of 7 Layer
22- What is the default size of Frame ?
23- Which layer are called upper layer?
a ) Application Layer – 7
b) Presentation Layer – 6
c ) Session Layer – 5
24- How many reserve ports ?
0 – 1023
25- Which decision called socket base?
IP plus port (IP on layer 3 and port on Layer 4 – In Encapsulation, socket base decision on Network Layer -Layer 3)
26- How many types of Data?
Voice, video, text
27 What is segmentation and fragmentation?
To divide data in pieces is called segmentation and divide segmentation in pieces called Fragmentation.
28- Which layer called error detection layer ?
Data link layer
29- What is FCS?
Frame Check Sequence –
CRC (Cyclic Redundancy Check) algorithm runs in switch that called FCS (Frame Check Sequence)
30- What is Encapsulation and De-encapsulation?
To send data called encapsulation and receive data called De-encapsulation.