LECTURE 1 TERMS

Question 1

Define a node

Answer 1

A node is any device on a computer network, i.e., Laptop, Phone, SmartWatch

Question 2

Define a Ad-hoc Network

Answer 2

A connection between 2 devices only.

Ex Bluetooth connection between a phone & EarPods, or phone & laptop (hotspot)

Question 3

What does LAN stand for and what does it mean?

Answer 3

(Local Area Network)

a network of small number within a limited distance, e.g., within a building or office.

Question 4

What does WAN stand for and what does it mean?

Answer 4

(Wide Area Network)

Interconnected LANs that cut across multiple locations / buildings.

They provide access to other networks over a wide geographical area and are typically owned and managed by a telecommunications service provider.

Question 5

What does MAN stand for and what does it mean?

Answer 5

(Metropolitan Area Network)

Uses WAN to interconnect LANs across a wide geographical areas, such as a city.

Question 6

Define Internet

Answer 6

worldwide public internetwork

Question 7

Define intranet

Answer 7

intranet is similar to internet but are for privately owned network, e.g., a network of a company with offices across the globe.

Question 8

Define server:

Answer 8

A dedicated high-end node that host resources or provides services to other nodes (clients).

E.g., a mail, database, or file/storage server.

• Usually runs server OS such as Windows Server, Unix, Linux etc.
• Usually tuned for high performance and fault tolerance.

Question 9

Define a client

Answer 9

A computing node which requests services or resources from a server.

Usually run desktop OS such as Windows 10/11, MAC OS X, as well as end-user applications such as browsers, word processors etc.

Question 10

Peer-to-peer

Answer 10

A node can act as both server and client

• Any node can share resource with any other node.

• Each node is its own administrator, hence can grant others unlimited or restricted access to
files/resources.

• Difficult to manage multiple credentials

Question 11

Define a publisher

Answer 11

Publisher: Nodes that send / publish messages to topics

Question 12

Define subscribers:

Answer 12

Subscribers: nodes that receive messages posted on topics.

Question 13

Topics:

Answer 13

Topics: “interest groups” / categories

Question 14

Broker:

Answer 14

Broker: serves as intermediary between both publishers and
subscribers.

Question 15

Publish-Subscribe (Pub/Sub) model consists of the four:

Answer 15

publisher, subscriber, topics, broker

Question 16

What are the two types of network addressing

Answer 16

physical and local