Computer networks worksheet with answers

What does "latency" mean in networking?

1. AThe delay for data to travel from source to destination
2. BThe error rate of a cable
3. CThe number of devices on a network
4. DThe maximum amount of data per second that a link can carry

What is the main job of a firewall?

1. ATo convert domain names into addresses
2. BTo assign IP addresses to hosts
3. CTo speed up downloads by caching files
4. DTo allow or block traffic according to security rules

In networking, a protocol is:

1. AA program that blocks viruses
2. BA physical cable between two devices
3. CA list of all devices on a network
4. DA set of rules for the format and order of messages

Which medium access method did classic shared (half-duplex) Ethernet use?

1. AToken passing
2. BTDMA
3. CCSMA/CA
4. DCSMA/CD

A router has routes for 10.0.0.0/8 and 10.1.0.0/16. Which route does it use for a packet to 10.1.5.5?

1. ABoth routes, splitting the traffic equally
2. B10.1.0.0/16, because it is the longest matching prefix
3. C10.0.0.0/8, because it was added first
4. D10.0.0.0/8, because it covers more addresses than the /16

How long does it take to put a 1500-byte packet onto a 12 Mbit/s link (transmission delay)?

1. A8 ms
2. B1 ms
3. C12 ms
4. D0.125 ms

Why does IPv6 not need NAT for address shortage?

1. AIts 128-bit address space is large enough to give every device a global address
2. BIPv6 encrypts all addresses
3. CIPv6 does not use addresses
4. DIPv6 only works on local networks, so addresses never need to be shared globally

By Shannon's theorem, what is the capacity of a 1 MHz channel with a signal-to-noise ratio of 255?

1. A2 Mbit/s
2. B1 Mbit/s
3. C8 Mbit/s
4. D255 Mbit/s