OSI Model

Question 1

How many Layers are in the OSI Model?

Answer 1

7

Question 2

The OSI Model defines what?

Answer 2

Open Systems Interconnection Model

The General Framework, Set of Guidelines, for Network Communication.

How data is handled at several different Layers. (7)

The Framework for TCP/IP Protocols and Hardware used on Networks.

Question 3

Who created the OSI Model?

Answer 3

International Organization for Standardization (ISO)

Question 4

Layer 4?

Answer 4

Transport

Question 5

Layer 2?

Answer 5

Data Link

Question 6

Layer 7?

Answer 6

Application

Question 7

Layer 1?

Answer 7

Physical

Question 8

Layer 3?

Answer 8

Network

Question 9

Layer 5?

Answer 9

Session

Question 10

Layer 6?

Answer 10

Presentation

Question 11

Layer 3 Data Measurement?

Answer 11

NETWORK - Packets

Question 12

Layer 1 Data Measurement?

Answer 12

PHYSICAL - Bits

Question 13

Layer 5 is responsible for what?

Answer 13

SESSION -

Establishing, maintaining, and terminating Sessions, which is a lasting connection between two networking devices.

Manages Connections.

Ensures that the data from different applications are kept separate for each application at the Application Layer.

Also tracks the mode of Transmission - Simplex, Half Duplex, or Full Duplex.

Question 14

Layer 7 Protocols?

Answer 14

APPLICATION -

DNS - Dynamic Name System
HTTP - Hypertext Transfer Protocol
FTP - File Transfer Protocol
TFTP - Trivial File Transfer Protocol
DHCP - Dynamic Host Configuration Protocol
LDAP - Lightweight Directory Access Protocol
POP3 - Post Office Protocol v3
SMTP - Simple Mail Transfer Protocol
IMAP - Internet Message Access Protocol
SNMP - Simple Network Management Protocol
SMB - Sever Message Block

Question 15

Layer 2 Measurement of Data?

Answer 15

DATA-LINK - Frames

Question 16

Layer 3 Protocols?

Answer 16

NETWORK -

IP Addressing
IPv4 - Internet Protocol v4
IPv6 - Internet Protocol v6
ARP - Address Resolution Protocol
IGMP - Internet Group Multicast Protocol
ICMP - Internet Control Message Protocol
IPSec - Internet Protocol Security
RIP - Routing Information Protocol
OSPF - Open Shortest Path First

Question 17

Layer 6 File Types and other responsibilities?

Answer 17

PRESENTATION -

MP3
JPG
GIF

Also responsible for Data Compression/Decompression and Data Encryption/Decryption.

Question 18

Layer 4 Data Measurement?

Answer 18

TRANSPORT - Segments

Question 19

Layer 2 Equipment?

Answer 19

DATA-LINK -

Switches
NICs - Network Interface Cards

Question 20

Layer 1 Equipment and Functions?

Answer 20

PHYSICAL -

Repeaters and Hubs

Converts Data Streams into Zeros and Ones (bits) and places them onto physical media in the form of electrical pulses for Copper Cable such as Twisted-Pair or Light Pulses for Fiber Optic Cable.

Physical Specifications of a Network and Physical Media such as Cables/Connectors.

Question 21

Layer 4 Protocols and Responsibilities?

Answer 21

TRANSPORT -

TCP - Transmission Control Protocol
UDP - User Datagram Protocol

Responsible for Transporting Data.
Handles Flow Control, Reliability, and Error Checking.

Question 22

Layer 2 Protocols?

Answer 22

DATA-LINK -

LLC - Logical Link Control
MAC - Media Access Control
PPTP - Point To Point Tunneling Protocol
L2TP - Layer 2 Tunneling Protocol
IEEE 802.5 - Token Ring
ATM - Asynchronous Transfer Mode
Frame Relay

Question 23

Where does a Router fall on the OSI Model and Why?

Answer 23

NETWORK - Layer 3

Responsible for Routing, determining the best route to the Destination using Routing Protocols to build Routing Tables and uses IP as the Routed Protocol.