Computer networks worksheet with answers

What is the name of the data unit at the data link layer?

1. ASegment
2. BPacket
3. CFrame
4. DMessage

What is the broadcast address of the network 192.168.1.0/24?

1. A192.168.1.0
2. B255.255.255.0
3. C192.168.1.1
4. D192.168.1.255

In the client-server model:

1. AEvery computer stores the whole internet
2. BAll devices must be in the same room
3. CServers send requests and clients answer them
4. DClients send requests and a server provides the service

How many usable host addresses does a /24 IPv4 network have?

1. A254
2. B256
3. C255
4. D252

Using even parity, which parity bit is added to the data bits 1011001?

1. A4
2. B2
3. C1
4. D0

Why does Wi-Fi use collision avoidance (CSMA/CA) instead of collision detection?

1. AA wireless station cannot reliably detect collisions while it is transmitting
2. BCollision detection only works on fibre cables, not on shared wireless radio channels
3. CWi-Fi only allows one device per network
4. DRadio signals never collide

Why does TCP choose an unpredictable initial sequence number for each connection?

1. ATo encrypt the payload of each segment
2. BTo avoid confusion with old segments and make spoofed segments harder to inject
3. CTo select the best route to the destination for the segments of that connection
4. DTo compress the data more efficiently

You must divide 192.168.1.0/24 into at least 5 subnets with up to 25 hosts each. Which prefix length fits best?

1. A/25
2. B/26
3. C/28
4. D/27