OSI Model

Question 1

Layer 7

Answer 1

Application layer - consists of end user protocols e.g SMTP, FTP and HTTP

Question 2

Layer 6

Answer 2

Presentation layer - apply encryption and translate the data between devices and operating systems. Includes data compression and mapped drives

Protocols include: SSL, SSH, IMAP

Question 3

Layer 5

Answer 3

Session layer - that controls the dialogue between the computers. Connections include:
Simplex
Half duplex
Full duplex

Question 4

Layer 4

Answer 4

Transport layer - tries to ensure an error free transmission of message through layers 3 and 1

Protocols include: UDP, TCP

Question 5

Layer 3

Answer 5

Network layer - this is the layer dedicated to routing information.

Devices include: routers and managed switches

Protocols include: IPv4/6, RIP, OSPF, IPX, ARP, ICMP

VLAN is also layer 3 technology

Question 6

Layer 2

Answer 6

Data link layer - establishes, maintains and deciphers how transfer is accomplished over the physical layer.

The data layer breaks down packets/ reassembles them upon transport/reviving

Mac addresses, switches and the PPP protocol (point to point) are at this layer

Question 7

Layer 1

Answer 7

Physical layer - this handles cables, patch panels and network topologies