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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Name: ____________________   Date: ____________

1.Easy

How many bits does an IPv4 address have?

  1. A128
  2. B32
  3. C16
  4. D64
2.Easy

Which IPv4 address is the standard loopback address of a host?

  1. A255.255.255.255
  2. B127.0.0.1
  3. C192.168.0.1
  4. D0.0.0.0
3.Easy

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

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

What does ARP do?

  1. AAssigns IP addresses automatically to hosts when they join the local network
  2. BRoutes packets on the internet
  3. CFinds the MAC address that belongs to an IP address on the local network
  4. DResolves domain names
5.Medium

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

  1. ACSMA/CA
  2. BCSMA/CD
  3. CToken passing
  4. DTDMA
6.Medium

How does TLS typically use asymmetric and symmetric cryptography?

  1. AOnly symmetric cryptography is used, with a fixed shared password
  2. BOnly asymmetric cryptography is used throughout
  3. CSymmetric methods agree keys and authenticate; asymmetric ciphers encrypt all the data
  4. DAsymmetric methods agree keys and authenticate; symmetric ciphers encrypt the data
7.Hard

How does a content delivery network (CDN) mainly improve web performance?

  1. AIt removes the need for DNS lookups
  2. BIt increases the bandwidth of the users' own home connections
  3. CIt replaces TCP with a faster transport protocol
  4. DIt serves cached content from servers close to the users
8.Hard

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

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

Answer key

  1. 1. B · 32
  2. 2. B · 127.0.0.1
  3. 3. C · 192.168.1.255
  4. 4. C · Finds the MAC address that belongs to an IP address on the local network
  5. 5. B · CSMA/CD
  6. 6. D · Asymmetric methods agree keys and authenticate; symmetric ciphers encrypt the data
  7. 7. D · It serves cached content from servers close to the users
  8. 8. C · How much unacknowledged data the sender may send, based on the receiver's buffer

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