OSI layer Functions

Question 1

layer 7

Answer 1

Application layer protocols
________________________________
HTTP, HTTPS, FTP, SMTP, IMAP
_________________________________
(these are application protocols;
Email,
Website page retrieval,
File transfer)
DATA: data 5 to 7

Question 2

Layer 6

Answer 2

Presentation layer does -
Encryption
Decryption
& Formatting
DATA: data 5 to 7

Question 3

Layer 5

Answer 3

Session layer-
Session Establishment,
Maintenance,
& Teardown
DATA: data 5 to 7
inititive to manage application interaction?…

Question 4

Layer 4

Answer 4

Transport Layer -
End-to-End communication
TCP & UDP
(Port Addresses)
DATA: (Segments)

Question 5

Layer 3

Answer 5

Network Layer-
Routes data packets between different IP networks.
(IP, ARP,ICMP),
(IP Addressing),
DATA: (Packets)
DEVICES:
- Router (IP to IP)
- Firewall(L3 & L4)

Question 6

Layer 2

Answer 6

Data Link Layer-
physical Addressing
device to device communication.
Ethernet,
PROTOCOLS: PPTP( VPN; works on frames data)
(MAC Addresses),
DATA: (Frames)
DEVICES:
- SWITCH(connected devices together)
- WAP(wireless to wired)
- Wireless range extender
- bridges

Question 7

Layer 1

Answer 7

Physical Layer-
Transmission of signals
DATA (raw bits) over physical medium
DEVICES:
-modem
-network cabling
-hub( bc its stupid)