The Internet

Question 1

What is packet switching?

Answer 1

Breaking down data into smaller packets and sending them across different routes and then reassembling them at the end of their destination

Question 2

What is the primary purpose of the internet?

Answer 2

To provide a global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide.

Question 3

True or False: An extranet is a private network that allows controlled access to external users.

Answer 3

True

Question 4

Fill in the blank: The internet is often referred to as a ____ network.

Answer 4

public

Question 5

Which of the following is a key difference between the internet and an extranet? A) Accessibility B) Security C) Both A and B

Answer 5

C) Both A and B

Question 6

What type of users typically access an extranet?

Answer 6

External partners, vendors, or customers who require controlled access to certain resources.

Question 7

what does URL mean/do?

Answer 7

Uniform resource locator, indicates the location of a resource (e.g. a website) and the protocol used to access it

Question 8

what is the difference between POP3 and IMAP?

Answer 8

POP3 is only accessible on one device and downloads the email whereas IMAP can access emails on multiple devices.

Question 9

what is the purpose of a DNS (domain name server)?

Answer 9

translates human-readable domain names (like www.example.com) into numerical IP addresses (such as 192.0.2.1) that computers use to locate each other on the internet

Question 10

why might a DNS not be needed?

Answer 10

the IP may be stored locally if it is accessed many times

Question 11

what is port 80 used for?

Answer 11

accessing websites (HTTP)

Question 12

what is port 443 used for

Answer 12

accessing secure websites (HTTPS)

Question 13

what is port 25 used for?

Answer 13

sending emails (SMTP)

Question 14

what is an API?

Answer 14

An API (Application Programming Interface) is a set of rules and protocols that allows different software applications to communicate with each other. for example an app using google maps or PayPal.

Question 15

what are the stages of packet switching?

Answer 15

1.messages split into packets
2.each packet is given a destination which is added to each packet
3.each packet is dispatched to the internet through a router
4.packets are sent independently
5.packets are given a sequence number
6.packets bounce between routers to get to destination
7.packets are reassembled at destination

Other: packets are sent across different routes and if a packet is lost at the destination it is resent