Computer networks worksheet with answers

Free printable Computer networks worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

What is throughput?

  1. AThe time a packet takes to cross a link
  2. BThe number of routers on a path
  3. CThe rate at which data is actually delivered successfully
  4. DThe theoretical maximum rate a link can carry under ideal conditions
2.Easy

What does "latency" mean in networking?

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

Which device simply repeats every incoming signal out of all its other ports?

  1. AA hub
  2. BA switch
  3. CA firewall
  4. DA router
4.Medium

NAT (network address translation) is mainly used to:

  1. ALet many devices with private addresses share one public IP address
  2. BTranslate domain names into IP addresses for devices on a local network
  3. CEncrypt traffic between two sites
  4. DIncrease the speed of a network cable
5.Medium

What characterises a distributed denial-of-service (DDoS) attack?

  1. AMany compromised machines flood a target with traffic
  2. BOne attacker guesses a user's password
  3. CAn attacker reads unencrypted Wi-Fi traffic from a nearby car
  4. DA virus deletes files on a single PC
6.Medium

How does a stateful firewall differ from a simple packet filter?

  1. AIt encrypts every packet it forwards
  2. BIt only checks the MAC address of each frame
  3. CIt tracks connections and allows replies that belong to established sessions
  4. DIt blocks all incoming traffic without exceptions, including replies to outgoing requests
7.Hard

An 8-port switch (no VLANs) has one host on each port. How many collision domains and broadcast domains are there?

  1. A8 collision domains, 8 broadcast domains
  2. B1 collision domain, 1 broadcast domain
  3. C1 collision domain, 8 broadcast domains
  4. D8 collision domains, 1 broadcast domain
8.Hard

In a TCP connection, what does the receive window (rwnd) control?

  1. AThe retransmission time-out, calculated from the measured round-trip time of each segment
  2. BHow much unacknowledged data the sender may send, based on the receiver's buffer
  3. CThe size of each IP packet header
  4. DThe number of open ports

Answer key

  1. 1. C · The rate at which data is actually delivered successfully
  2. 2. B · The delay for data to travel from source to destination
  3. 3. A · A hub
  4. 4. A · Let many devices with private addresses share one public IP address
  5. 5. A · Many compromised machines flood a target with traffic
  6. 6. C · It tracks connections and allows replies that belong to established sessions
  7. 7. D · 8 collision domains, 1 broadcast domain
  8. 8. B · How much unacknowledged data the sender may send, based on the receiver's buffer

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