Computer Networks

How long does an email take to get from the UK to the USA?

• A fraction of a second

• 1 second

• 2 - 3 weeks

• 1 Day

What is latency?

• How late a message is

• The time it takes for a message to transfer

• Being late for a meeting

• The time it takes to be considered late or not on time

When did computers start to communicate with each other?

• 1970s

• 1980s

• 1990s

• 2000

What is the main purpose of networks?

• To send emails to people

• To share data files and hardware resources

• To watch YouTube videos

• Only for recreational purposes

What does LAN stand for?

• Local Architecture Network

• Limited Area Network

• Local Area Network

• Load As Needed

What is a MAC Address

• A number assigned to every machine in one specific network

• The address of every Apple Mac product

• A unique identifier for every machine (Computer)

• Mobil Access Credential

The rate at which a carrier can transmit is known as?

• Carrier Speed

• Bandwidth

• Transmission Data Spread

• Hi-Speed Internet

What is a collision?

• When data goes too fast and bumps into another piece of data

• When two or more computers attempt to send messages at the same time

• When all the computers start sending messages at once

• When poor cable or Wi-Fi causes internet traffic to slow due to poor conditions

Why doesn't waiting a random time solve the problem?

• The machine might forget to try again

• The machines might both wait the same random amount of time

• Another machine might still be transmitting

What is exponential backoff?

• Increasing the waiting time in powers of 2 ( 1, 2, 4, 8, 16) Seconds

• Waiting a really long time to be sure all the other machines have finished

• Trying harder to send the data even when there is other traffic on the network

• Waiting (1, 3, 6, 12, 24) Seconds to retransmit