Question

crash course #28 computer networks

1. ______________ is the time it takes for a message to transfer.
2. computers have been connected to networks from almost the very beginning. true / false
3. when did the first computer - networks start to appear?

a. 1920s/1930s c. 1940s/1950s
b. 1930s/1940s d. 1950s/1960s

1. these relatively small networks of close - by computers are called ____________ networks, or ____________
2. what was themost famous and successful of these early network technologies?
3. every computer made today comes with its own unique mac address. true / false
4. the rate at which a carrier can transmit data is called its ______________.
5. to solve collisions and congestion on the network, a ____________ behavior is used. this allows computers to wait until the network is free before they transmit. computer will increase their wait time if they continue to have trouble. this use of an exponentially growing wait time is called ____________
6. with the modern ethernet troubleshoots and strategies in place, it is now possible to connect hundreds of computers, even an entire university, on a single shared ethernet cable. true or false
7. the internet interconnects a bunch of smaller networks. true / false
8. in ______________messages are passed through several stops to get from point a to b.
9. the number of hops a message takes along its route is called ______________.
10. big transmissions can be chopped up into many small pieces called ______________.
11. chopping up data into smaller pieces and passing them along flexible routes is what the whole internet runs today. true / false
12. the threat of ____________ is why packet switching was developed during the ____________
13. as of 2017, it is estimated that there are almost ______________ computers online.

a. 100 million c. 10 billion
b. 1 billion d. 100 billion

Explanation:

1. Latency is the time for message transfer.
2. Computers have been connected to networks almost from the start, so True.
3. The first computer - networks started to appear in the 1960s/1970s, so B.
4. These relatively small networks of close - by computers are called local area networks (LANs).
5. One of the most famous and successful early network technologies was ARPANET.
6. Every computer made today has a unique MAC address, so True.
7. The rate at which a carrier can transmit data is called its bandwidth.
8. To solve collisions and congestion, a carrier - sense multiple access with collision avoidance (CSMA/CA) behavior is used, and the exponentially growing wait time is called exponential backoff.
9. With modern Ethernet, it is not possible to connect hundreds of computers on a single shared Ethernet cable due to limitations, so False.
10. The Internet interconnects smaller networks, so True.
11. In packet - switching messages are passed through several stops to get from point A to B.
12. The number of hops a message takes along its route is called hop count.
13. Big transmissions can be chopped up into small pieces called packets.
14. Chopping up data into smaller pieces and passing them along flexible routes is how the Internet runs today, so True.
15. The threat of nuclear attack (during the Cold - war) led to the development of packet - switching.
16. As of 2017, it is estimated that there are almost 10 billion computers online, so C.

Answer:

1. Latency
2. True
3. B. 1960s/1970s
4. local area
5. ARPANET
6. True
7. bandwidth
8. carrier - sense multiple access with collision avoidance (CSMA/CA); exponential backoff
9. False
10. True
11. packet - switching
12. hop count
13. packets
14. True
15. nuclear attack
16. C. 10 billion