OSI Model

Question 1

Layer 1

Answer 1

Physical,
Cables, copper, fiber ones and zeros , bits
Physical (PHY) layer transmission media types
*Cabled
*Wireless
*PHY layer features
*Physical topology and segments
*Physical interface and transmission of signals
*Modulation and encoding
*Devices working at layer 1
*Transceiver, repeater, hub, media converter, modem

Question 2

Layer 2

Answer 2

Data Link
Frames
switches
anything 802.xx
Frame Relay
Mac address
Exchange PDUs as frames using hardware addresses within local segment
*Logical versus physical topology
*Intermediate systems versus end systems
*Devices working at layer 2
*Network interface card (NIC), bridge, switch, wireless access point (AP)

Question 3

Layer 3

Answer 3

Network
Routers, packets IP address
MPLS
Network of networks or internetwork
*Forward datagrams/packets via routers using logical network addresses
*Can contain multiple segments using different physical layer specifications and layer 2 protocols
*Devices working at layer 3
*Router, basic firewall

Question 4

Layer 4

Answer 4

Transport: TCP/IP segments
User Datagram Protocol (UDP) and of the Internet Protocol (IP).Identify application data using port numbers
*Load balancer, advanced firewall, intrusion detection system (IDS)

Question 5

Layer 5

Answer 5

Session
Establish rules for exchange of messages and sequencing (dialog control)

The session layer provides the mechanism for opening, closing and managing a session between end-user
full duplex or half-duplex

Question 6

Layer 6

Answer 6

Presentation
serves as the data translator for the network.[2][3][4] It is sometimes called the syntax layer.[5]

ASCII-coded file

Data conversion[3]
Character code translation[3]
Compression[3]
Encryption and Decryption[3]
Serialization

Question 7

Layer 7

Answer 7

Application is an abstraction layer that specifies the shared communication protocols and interface methods used by hosts in a communications network.