1.1 OSI Model

Question 1

Layer 1 called

Answer 1

(Physical)

Question 2

Layer 2 called

Answer 2

(Data link) “Switching layer.”

Question 3

Layer 3 called

Answer 3

(Network) “routing layer.”

Question 4

Layer 4 called

Answer 4

(Transport) “post office layer.”

Question 5

Layer 5 called

Answer 5

(Session)

Question 6

Layer 6 called

Answer 6

(Presentation)

Question 7

Layer 7 called

Answer 7

(Application)

Question 8

Layer 1(Physical) do

Answer 8

signaling, cables, connectors

Question 9

Layer 2(Data link) do

Answer 9

foundation of communication. Data Link Control (DLC) protocols. MAC address

Question 10

Layer 3(Network) do

Answer 10

IP addresses. Fragments frames to traverse different networks.

Question 11

Layer 4(Transport) do

Answer 11

how data is being delivered or from where it’s being delivered. Use TCP & UDP.

Question 12

Layer 5(Session) do

Answer 12

start, stop, restart communication between devices. Uses control & tunneling protocols. VPN can be used

Question 13

Layer 6(Presentation) do

Answer 13

character encoding, app encryption(SSL/TLS) combined with layer 7(Application).

Question 14

Layer 7(Application) do

Answer 14

layer we can see. HTTPS, FTP, DNS, POP3.

Question 15

Layer 1 devices

Answer 15

hubs, repeaters, modem(layer 1 & 2), Media converter

Question 16

Layer 2 devices

Answer 16

switch, access point, bridge, network interface card(NIC), modem(layer 1 & 2), Load Balancer(layer 2 & 3), firewall(Layer 2/3)

Question 17

Layer 3 devices

Answer 17

routing capable switch, router, Load Balancer(layer 2 & 3), firewall(Layer 2/3)

Question 18

Ethernet(Layer 2) header encapsulation or decapsulation

Answer 18

IP header, TCP/UDP header & Data Payload.

Question 19

Ethernet(Layer 2) header contains

Answer 19

Mac Address info

Question 20

Internet Protocol (IP) (Layer 3)header encapsulation or decapsulation

Answer 20

TCP/UDP header & Data Payload.

Question 21

Internet Protocol (IP) (Layer 3)header contains

Answer 21

IP addresses info

Question 22

TCP/ UDP (Layer 4) headers encapsulation or decapsulation

Answer 22

Data Payload.

Question 23

TCP/ UDP (Layer 4) headers contains

Answer 23

TCP/UDP & port info

Question 24

TCP flags

Answer 24

tells a device what to do with each header in the OSI Model

Question 25

SYN flag

Answer 25

Synchronize sequence numbers

Question 26

PSH flag

Answer 26

Push the data to app without buffering

Question 27

RST flag

Answer 27

Reset connection

Question 28

FIN flag

Answer 28

Last packet from sender

Question 29

Payload encapsulation or decapsulation

Answer 29

contains layer 5-7. App data that is needed

Question 30

Maximum transmission unit (MTU)

Answer 30

set amount of data allowed through a network without fragmenting.