DNS, Switching, HW

DNS, Switching, Topologies

Revision!

DNS

• Domain Name Service

• Translates web addresses into IP Addresses

Multiple Choice

What does DNS stand for?

• Direct Naming Service

• Domain Name Situation

• Direct Naming Service

• Domain Name System

Multiple Choice

DNS maps human, readable domain names into actual ___.

• IP addresses.

• domain names.

• servers.

• caches.

Multiple Choice

When searching for a DNS, your computer will automatically check it's memory, which is also called

• cache

• top level domain

• IP address

• root

Multiple Select

Which of these is stored in the header of a packet?

• Senders IP Address

• Recipient IP Address

• Username

• Packet Number

• Time Sent

Cloud Storage

• Stores data/software on a remote server (offsite)

• Dropbox, Amazon Cloud, OneDrive...

• Data is stored on SSDs (most likely)

• Data is backed up automagically

• Data often stored in various locations

Advantages

• Allows access to files from anywhere with an internet connection

• Share data with people in different locations

• Data is backed up automatically (SLA)

• Providers are legally bound to safeguard the data

• Access is on demand (SaS)

Disadvantages

• You are entirely dependant on having an internet connection

• Some users are concerned about security

• Big companies may be targets for hackers

• 
  

• 
  

Multiple Choice

Which of the following are advantages of cloud storage?

• It requires an internet connection, services can be free, can access from any internet connected device.

• Cloud providers control your data, services can be free, can share, edit and save files online.

• Can access with any internet enabled device, can share, edit and save files online, provider handles security.

Multiple Choice

Which of the following best describes cloud storage?

• Cloud storage is free and means you store data online.

• Cloud storage can be free or paid for and means you store data online

• Cloud storage can be free or a paid for service where you copy data to an online account.

Multiple Select

Which of the following statements are true?

• Local Area Networks cover a small geographical area whereas a Wide Area Network covers a large geographical

• Local Area Networks cover a single site such as a school whereas a Wide Area Network can cover several sites

• Local Area Networks are made from a single network whereas a Wide Area Network is made up of several LANs

Multiple Choice

Which of the following HARDWARE does a computer need to connect to a network or other computer devices?

• ethernet card

• NIC card

• IP Address

• WiFi

Multiple Choice

A stand alone computer cannot connect to the Internet or any other computer.

• true

• false

Multiple Choice

 A network is created when one device is connected . 

• True 
• False 

Star Topology

• Has a central switch or hub to direct the packets of data

• Each node has its own cable/link to the switch/hub

• + If one cable fails the rest of the network is fine

• + Consistant performance under heavy load

• - Central point of failure

• Relatively expensive (Cables + switch)

Full Mesh Networks

• Each node is connected to every other node

• Very expensive and complex to set up and maintain

• Needs specialist equipment and staff

• Very stable, difficult to disrupt

• No central point of failure

• 
  

Partial Mesh

• Not all nodes are connected

• still relatively stable, but less expensive

• 
  

• 
  

• 
  

• 
  

• +

Multiple Choice

Which of the following is a disadvantage of a mesh network topology?

• If the central switch or server fails, the whole network is down
• Requires a high performance switch or server in the centre as all traffic passes through it.
• Very expensive due to the amount of cabling required.
• It can handle very high data traffic rates

Multiple Choice

A mesh network is very robust. If one path fails, the rest can still be used - True or False?

• True
• False

Multiple Choice

An advantage of a mesh network topology is that there is no central node to fail - True or False?

• True
• False

Multiple Choice

Which of the following is a disadvantage of a star network topology?

• If the central switch or server fails, the whole network is down
• Requires a high performance switch or server in the centre as all traffic passes through it.
• Extra hardware such as hubs and switches may be needed
• All 3 of them

Multiple Choice

Which of the following is NOT an advantage of a star network topology?

• There is no central node to fail
• Simple to add or remove a node as it has no effect on any other node
• Good security - no workstation can interact with another without going through the server first
• Very few data collisions as each node has its own cable to the server

Multiple Choice

Which of the following is NOT an advantage of a star network topology?

• There is no central node to fail
• Simple to add or remove a node as it has no effect on any other node
• Good security - no workstation can interact with another without going through the server first
• Very few data collisions as each node has its own cable to the server

Multiple Choice

A .........network is a network topology with each node being interconnected.

• Star

• Mesh

Multiple Choice

Which network topology has a central node connected to all other nodes.  The central node might be a hub, switch or server.

• Star
• Mesh

Multiple Choice

Which network topology is this?

• Bus
• Ring
• Mesh
• Star

Multiple Choice

Which network topology is this?

• Star
• Mesh
• Ring
• Bus

Multiple Choice

This is a technical term that describes the layout of connections in a network.

• Network Topology
• Standalone Computer
• Network Node
• Workstation

Wireless Mesh/Partial Mesh

• A more modern version of the topology

• Cheaper - as no need for expensive cables

• The more nodes that are installed, the FASTER the network

• New nodes are automatically incorporated into the network

• Networks 'self-heal' if errors are detecected

•