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WorksheetsComputer Networks
Total questions: 18
Worksheet time: 9mins
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
What is the purpose of a switch?
To reduce the size of the possible collision domain, making the network capable of passing more than one message at a time
To communicate between different parts of a network when they are far apart
To turn the network on and off again when it breaks
To switch between Email, Video & Text data
What are the disadvantages of circuit switching?
It is less secure
It's expensive and inflexible with often times unused capacity
It can only go a limited distance
Only works with telephones
Why do the military own their own communication links
because they don't trust contractors
to ensure they always have connection and it is private
because they have a big budget
to seem important & special
What is the job of a router?
To send packets to their destination directly
To forward messages or packets to the next hop on their way to their destination
To send messages to the nearest other router
What does IP stand for?
Information Packet
Internet Protocol
International Pancake
Include Process
What are the advantages of packet switching as a method of communicating?
There is no danger of a bottleneck slowing down or stopping the whole system
If one packet goes missing the rest will get through and deliver the message
There is always someone monitoring the network
What was ARPANET
The Ancestor of the Modern Internet
The first Gaming only Network
The First Streaming Content Service
The Ancestor of "The Justice League"
What group created this video for YouTube?
Marvel Comics
Crash Course
The USDA
KET
