Domain 4 thor

Question 1

What is Simplex?

Answer 1

Simplex is one-way communication

Question 2

What is Half-Duplex?

Answer 2

Half-Duplex communication sends or receives at one time only.
the communication is either A to B or B to A. it is NOT bidirectional communication.

(think of a walkie talkie, when the button is pressed you are sending and are unable to receive and vice versa)

Question 3

What is Full-Duplex?

Answer 3

Full-Duplex communication sends and receives simultaneously.

Question 4

What is Baseband?

Answer 4

Baseband networks have one channel and can only send one signal at a time

Question 5

What is Broadband?

Answer 5

Broadband networks have multiple channels and can send and receive multiple signals at a time.

Question 5

Define what the internet is.

Answer 5

the internet is a global collection of peered WAN networks, it is really a patchwork of ISPs

Question 6

What is Circuit Switching

Answer 6

Circuit switching is a type of network configuration in which a physical path is obtained and dedicated to a single connection between two endpoints

it is expensive but is always available but today it is less commonly used

Question 6

Define what an Extranet is

Answer 6

an extranet is a connection between private intranets

Question 6

Define what an Intranet is

Answer 6

An intranet is an organisations privately owned network

Question 7

What is Packet Switching

Answer 7

a mode of data transmission in which a message is broken into a number of parts which are sent independently, over whatever route is optimum for each packet, and reassembled at the destination.

it is cheap but there is no capacity guarantee. today it is widely used (how routers send information)

because of how packet switching works, QoS (Quality of Service) gives specific traffic priority over other traffic. example: live video call is prioritised over downloading data

Question 8

What is UDP

Answer 8

a communications protocol primarily used to establish low-latency and loss-tolerating

UDP is connectionless

Question 9

What is TCP

Answer 9

Transmission Control Protocol (TCP) is a transport protocol that is used on top of IP to ensure reliable transmission of packets.

TCP is a connection-based protocol

Question 10

What is a PAN

Answer 10

PAN is Personal Area Network. Its is a computer network used for communication among computers and other IT devices close to one person.

Question 11

What is LAN

Answer 11

Lan is Local Area Network. its a network that connects computers and devices in a limited geographical area.

every device on that network is called a node.

Question 12

What is a MAN

Answer 12

a MAN is a Metropolitan Area Network. it is a large computer network that usually covers a city or large campus.

Question 13

in the OSI model what is layer 7?

Answer 13

Application Layer

Question 14

in the OSI model what is layer 6?

Answer 14

Presentation Layer

Question 15

in the OSI model what is layer 5?

Answer 15

Session Layer

Question 16

in the OSI model what is layer 4?

Answer 16

Transport Layer

Question 17

in the OSI model what is layer 3?

Answer 17

Network Layer

Question 18

in the OSI model what is layer 2?

Answer 18

Data Link Layer

Question 19

in the OSI model what is layer 1?

Answer 19

Physical Layer

Question 20

What is the OSI model? (definition)

Question 21

in the Protocol Data Units (PDU) model, what are the layers?

Answer 21

Bits, Frames< Packets, Segments, Data

Question 22

in the TCP/IP model, what are the layers?

Answer 22

Application Layer, Transport Layer, Internetwork Layer, Link and Physical Layer