Osi Model And Encapsulation

Question 1

What is layer 1

Answer 1

Physical layer.
Cabling, signaling, connectors.
Anything wrong in this layer you need to fix cables, punch downs, run loopback tests

Question 2

What is layer 2

Answer 2

Data link layer.
MAC addresses, and switching

Question 3

What is layer 3

Answer 3

Network layer.
Routing, IP addresses, fragment frames

Question 4

What is layer 4

Answer 4

Transport layer.
Post office layer, parcels/letters.
TCP(transmission control protocol),
UDP(user data gram protocol)

Question 5

What is layer 5

Answer 5

Session layer.
Communication between devices, stop/start/restart, half duplex and full duplex, control protocols and tunneling protocols

Question 6

What is layer 6

Answer 6

Presentation layer.
Character encoding, application encryption, often combines with layer 7

Question 7

What is layer 7

Answer 7

Application layer.
The layer we see - http, pop3

Question 8

Fragments are always in multiples of..

Answer 8

8

Question 9

Ethernet operates on a … of data

Answer 9

Frame

Question 10

IP operates on a .. of data

Answer 10

Packet

Question 11

What is the PDU at the physical layer

Answer 11

Bits

Question 12

What is the PDU at the data link layer

Answer 12

Frames

Question 13

What is the PDU at the network layer

Answer 13

Packets

Question 14

What is the PDU at the transport layer

Answer 14

Segments

Question 15

What is the PDU at the session layer

Answer 15

Data

Question 16

What is the PDU at the presentation layer

Answer 16

Data

Question 17

What is the PDU at the application layer

Answer 17

Data