Messer - OSI Model

Question 1

What does OSI model stand for?

Answer 1

Open Systems Interconnection Reference Model

Question 2

OSI model layers:

Answer 2

7) application, 6) presentation, 5) session, 4) transport, 3) network, 2) data link, 1) physical

Question 3

physical layer of osi model

Answer 3

signaling, cabling, connectors, the “physical” part of data transfer

Question 4

data link layer of osi model

Answer 4

basic network “language”. Often called MAC address layer. the “switching” layer (as switches operate on this layer)

Question 5

network layer of osi model

Answer 5

the “routing” layer. layer where routers are. Layer involves IPs. can fragment on this layer to traverse different networks

Question 6

transport layer of osi model

Answer 6

the “post office” layer. gets info from one network to another. tcp and udp on this layer.

Question 7

session layer of osi model

Answer 7

communication management between devices (start, stop, restart). control protocols and tunneling protocols

Question 8

presentation layer of osi model

Answer 8

character encoding. application encryption and decryption. often combined with application layer

Question 9

application layer of osi model

Answer 9

the layer we see. http, ftp, dns, pop3, etc.

Question 10

osi physical layer examples

Answer 10

cables, fiber, and the signal itself

Question 11

osi data link layer examples

Answer 11

frame, mac address, extended unique identifier (EUI-48, EUI-64), switch

Question 12

osi network layer examples

Answer 12

ip address, router, packet

Question 13

osi transport layer examples

Answer 13

tcp segment, udp datagram

Question 14

osi session layer examples

Answer 14

control protocols, tunneling protocols

Question 15

osi presentation layer examples

Answer 15

application encryption (ssl/tls)

Question 16

osi application layer examples

Answer 16

everything you see

Question 17

popular application that captures network data for review

Answer 17

Wireshark