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Computer Science > Network Topologies, Protocols & Layers > Flashcards

Network Topologies, Protocols & Layers Flashcards

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1
Q

What are the Methods of Connection?

A

Wired and wireless

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2
Q

What are the Characteristics of Wired Connections?

A
  • Faster
  • Can Send Large Quantities of data
  • Secure
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3
Q

What are the Characteristics of Wireless Connections?

A
  • Not as Secure

- Used by Portable Devices

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4
Q

What is WI-FI?

A

Uses wireless frequencies 2.4GHz or 5GHz wavebands to send data through separate channels

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5
Q

What is Bluetooth?

A

Short range wireless connection

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6
Q

What is Standards?

A

Allows hardware & software to interact across different manufacturers

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7
Q

What are Protocols?

A

The rules for transferring data.

Every device has a MAC address so that is can be identified on a network

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8
Q

What are IP addresses?

A

Used when sending data between networks.

It’s a unique strong set of characters that identifies each device when sending data over the internet using IP

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9
Q

What is TCP/IP?

A

Used to send data between networks in packets

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10
Q

What is Transmission Control Protocol (TCP)?

A

Splits the data into packets and re-assembles. Checks data is sent correctly

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11
Q

What is Internet Protocol (IP)?

A

Does the packet switching

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12
Q

What does HTTP stand for?

A

Hyper Text Transfer Protocol

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13
Q

What is HTTP (Hyper Text Transfer Protocol) used for?

A

For accessing websites

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14
Q

What is HTTPS? (Hyper Text Transfer Protocol Secure)

A

The secure version of HTTP

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15
Q

What is File Transfer Protocol (FTP)?

A

Moves files between devices

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16
Q

What is Post Office Protocol (POP3)?

A

Retrieves emails from server. Once you download the email, the server copy is deleted

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17
Q

What is Internet Message Access Protocol (IMAP)?

A

Retrieves email from server. Email is kept on server, you see copy

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18
Q

What is Simple Mail Transfer Protocol (SMTP)?

A

Sends emails

19
Q

What does TCP stand for?

A

Transmission Control Protocol

20
Q

What does IP stand for?

A

Internet Protocol

21
Q

What does FTP stand for?

A

File Transfer Protocol

22
Q

What does POP3 stand for?

A

Post Office Protocol

23
Q

What does IMAP stand for?

A

Internet Message Access Protocol

24
Q

What does SMTP stand for?

A

Simple Mail Transfer Protocol

25
Q

What does HTTPS stand for?

A

Hyper Text Transfer Protocol Secure

26
Q

What is Packet Switching?

A
  • Data split into packets and numbered in order
  • Each packet sent the fastest route across internet by routers, means packets can take different routes and arrive out of order
  • Packet numbers are used to put them in order
  • If packets are missing, a timeout message is sent
  • Once all have arrived, a receipt confirmation is sent to device that send them
27
Q

What does DNS stand for?

A

Domain Name Server

28
Q

What does a Domain Name Server (DNS) do?

A

Stores the IP address and URL of the website, matches the URL and IP address and sends back to your computer the IP address which then sends a request to web server for that file.

29
Q

What is Hosting?

A

Computer that stores a particular resource

30
Q

What is the Cloud?

A

Storage of programs and data on a server anywhere in the world, allows access from anywhere

31
Q

What is a Webserver?

A

Stores Webpages / HTML Pages

32
Q

What is a Client?

A

Requests data from a server

33
Q

What is Encryption?

A

Data is scrambled so that it cannot be understood if intercepted
It can only be decrypted with a key
Secures data as it is transferred across the network

34
Q

What are Network Protocols Divided into?

A

Layers, so that protocols with similar functions are grouped together

35
Q

What is Layer 1 called?

A

Data Link

36
Q

What is Layer 2 called?

A

Network

37
Q

What is Layer 3 called?

A

Transport

38
Q

What is Layer 4 called?

A

Application

39
Q

What happens in Layer 1: Data Link?

A
  • Sending Data over a Physical Network

- Ethernet

40
Q

What happens in Layer 2: Network?

A
  • Direct Data Packets Between Networks

- IP

41
Q

What happens in Layer 3: Transport?

A
  • Control the Flow of Data

- TPC

42
Q

What happens in Layer 4: Application?

A
  • Turn Data into Applications or Websites

- HTTP, FTP, SMTP

43
Q

What are the Pros of Cloud Storage?

A
  • Accessibly: Can be accessed from anywhere with an internet connection
  • Cost Savings: Little or no cost for a small organisation
  • Disaster Recovery: Emergency backup
  • Scalability: Only pay for storage you need
  • Storage Immortality: Opportunity to bypass risk of purchasing hardware that will soon be obsolete
44
Q

What are the Cons of Cloud Storage?

A
  • Security and Privacy in the Cloud: Concerns with value and important data being stored remotely
  • Bandwidth Limitations: bandwidth allowance
  • Vulnerability to Attacks: external hack attacks
  • Data Management: hassle, as cloud storage systems have their structures
  • Lifetime Costs: Price cost over the years might increase and tend to add up

Computer Science (5 decks)

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