OSI Model

Question 1

OSI Model: Physical

Answer 1

Governs the layout of cables and devices, such as

repeaters and hubs

Question 2

OSI Model: Data Link

Answer 2

Provides MAC* addresses to uniquely identify network
nodes and a means for data to be sent over the Physical
layer in the form of packets. Bridges and switches are
Layer 2 devices.

Question 3

OSI Model: Network

Answer 3

Handles routing of data across network segments.

Question 4

OSI Model: Transport

Answer 4

Provides for reliable delivery of packets

Question 5

OSI Model: Session

Answer 5

Establishes sessions between network applications.

Question 6

OSI Model: Presentation

Answer 6

Converts data so that systems that use different data

formats can exchange information.

Question 7

OSI Model: Application

Answer 7

Allows applications to request network services.

Question 8

TCP/IP Model:Network layer

Answer 8

The Network layer is where data is addressed, packaged, and routed among
networks.

Question 9

TCP/IP Model: Transport layer

Answer 9

The Transport layer is where sessions are established and data packets are
exchanged between hosts

Question 10

TCP/IP Model: Application layer

Answer 10

The Application layer of the TCP/IP model corresponds to the Session,
Presentation, and Application layers of the OSI reference model.

Question 11

TCP/IP Model: Network Interface layer

Answer 11

It corresponds to the OSI Physical and Data Link layers. You can use many
different TCP/IP protocols at the Network Interface layer, including Ethernet
and token ring for LANs and protocols such as X.25, Frame Relay, and ATM
for wide area networks (WANs).

Question 12

(IP):

Answer 12

Internet Protocol A routable protocol that uses IP addresses to
deliver packets to network devices. IP is an intentionally unreliable protocol,
so it doesn’t guarantee delivery of information.

Question 13

(ARP):

Answer 13

Address Resolution Protocol Resolves IP addresses to hardware
Media Access Control (MAC) addresses, which uniquely identify hardware
devices.

Question 14

(ICMP):

Answer 14

Internet Control Message Protocol Sends and receives diagnostic
messages. ICMP is the basis of the ubiquitous ping command.

Question 15

(IGMP):

Answer 15

Internet Group Management Protocol Used to multicast messages
to multiple IP addresses at once.

Question 16

(TCP):

Answer 16

Transmission Control Protocol Provides reliable connectionoriented
transmission between two hosts. TCP establishes a session
between hosts, and then ensures delivery of packets between the hosts.

Question 17

(UDP):

Answer 17

User Datagram Protocol Provides connectionless, unreliable, oneto‐
one or one‐to‐many delivery.

Question 18

(HTTP):

Answer 18

HyperText Transfer Protocol (HTTP): The core protocol of the World
Wide Web.

Question 19

(FTP):

Answer 19

File Transfer Protocol (FTP): A protocol that enables a client to send and
receive complete files from a server.

Question 20

Telnet:

Answer 20

The protocol that lets you connect to another computer on the
Internet in a terminal emulation mode.

Question 21

(SMTP):

Answer 21

Simple Mail Transfer Protocol (SMTP): One of several key protocols that
are used to provide email services.

Question 22

(DNS):

Answer 22

Domain Name System (DNS): The protocol that allows you to refer to
other host computers by using names rather than numbers.