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A-Level Computer Science > Protocols > Flashcards

Protocols Flashcards

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1
Q

What are some protocols?

A

TCP/IP (Transmission control protocol / internet protocol)
FTP (File transfer protocol)
HTTP (Hypertext transfer protocol)

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2
Q

What does TCP do?

A

The set of rules that govern the transmission of packets of data over the internet.

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3
Q

What does HTTP do?

A

The set of rules governing the way web content is transmitted and formatted.

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4
Q

What does FTP do?

A

The set of rules governing the transfer of files on the internet.

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5
Q

What does POP3 do?

A

Is a mail protocol used to retrieve emails.

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6
Q

What does IMAP do?

A

Protocol for accessing/retrieving emails.

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7
Q

What does SMTP do?

A

A protocol for the sending of emails over the internet.

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8
Q

What does SSH do?

A

Secure Shell is a protocol for communications and the sharing of data between computers.

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9
Q

What does DNS do?

A

A protocol for translating domain names into their corresponding IP addresses.

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10
Q

Describe the process by which DNS works.

A

A domain name is entered to web browser and sent to the DNS server.
The DNS matches the domain to its corresponding IP address.
It sends the IP address back to the web browser.

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11
Q

What port number is FTP?

A

21

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12
Q

What port number is SSH?

A

22

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13
Q

What port number is Telnet?

A

23

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14
Q

What port number is SMTP?

A

25

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15
Q

What port number is DNS?

A

53

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16
Q

What port number is HTTP?

A

80

17
Q

What port number is POP3?

A

110

18
Q

What port number is IMAP?

A

143

19
Q

What does DHCP stand for (protocols)?

A

Dynamic Host Configuration Protocol

20
Q

What is the purpose of DHCP?

A

To automate the configuration of hosts connecting to a network.

21
Q

Why is DHCP used?

A

Reduces need for expert knowledge of configuring hosts.
Reduces human error (e.g duplicating IP addresses, incorrect subnet mask).

22
Q

Describe how DHCP works?

A

Host sends a request for configuration.
DHCP server offers configuration.
Host accepts offer of configuration from DHCP server.
DHCP server confirms allocation of configuration to host.

A-Level Computer Science (17 decks)

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