OSI & TCP/IP Model

Question 1

OSI Application Layer

Answer 1

Layer 7 - The layer we see

HTTP, FTP, SMTP
Google Mail, Twitter, Facebook

(Data)

Question 2

OSI Presentation Layer

Answer 2

Layer 6 - Encoding and encryption

SSL, TLS
ASCII, JPEG, GIF

(Data)

Question 3

OSI Session Layer

Answer 3

Layer 5 - Communication between devices

Control protocols
Tunneling protocols
Session setup/termination
Data Transfer

(Data)

Question 4

OSI Transport Layer

Answer 4

Layer 4 - The “post office” layer

TCP/UDP

(Segment)

Question 5

OSI Network Layer

Answer 5

Layer 3 - The routing layer

IP address, router, packet

(Packets)

Question 6

OSI Data Link Layer

Answer 6

Layer 2 - The switching layer

Frame, MAC address, EUI-48, EUI-64, Switch
Two Sub Layers:
(1) LLC - communicates w/ layer 3
(2) MAC - physical addressing

(Frames)

Question 7

OSI Physical Layer

Answer 7

Layer 1 - Signaling, Cabling, Connectors

Cable, NIC, Hub
Transmitters, repeaters
CSU/DSU

(Bits)

Question 8

TCP/IP Application Layer

Answer 8

OSI = Application, Presentation, Session

FTP, BOOTP, TFTP, DNS, HTTP(S), TLS/SSL, VoIP, SSH, POP3, IMAP4, NTP, Telnet, SMTP, SNMP

Question 9

TCP/IP Transport Layer

Answer 9

OSI = Transport

TCP/UDP

Question 10

TCP/IP Internet Layer

Answer 10

OSI = Network

IPv4, IPv6, ICMP, IGMP

Question 11

TCP/IP Link Layer

Answer 11

ARP