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

Which protocol is used to send email between mail servers?

  1. AIMAP
  2. BPOP3
  3. CSNMP
  4. DSMTP
2.Easy

Which type of network covers a large geographic area, such as a whole country?

  1. AA local area network (LAN)
  2. BA virtual LAN (VLAN)
  3. CA personal area network (PAN)
  4. DA wide area network (WAN)
3.Easy

Which IEEE standard family defines wired Ethernet?

  1. AIEEE 802.5
  2. BIEEE 802.16
  3. CIEEE 802.3
  4. DIEEE 802.11
4.Medium

Which range of TCP/UDP port numbers is reserved as "well-known" ports?

  1. A0–65535
  2. B1024–49151
  3. C0–1023
  4. D49152–65535
5.Medium

How does TLS typically use asymmetric and symmetric cryptography?

  1. AOnly symmetric cryptography is used, with a fixed shared password
  2. BAsymmetric methods agree keys and authenticate; symmetric ciphers encrypt the data
  3. COnly asymmetric cryptography is used throughout
  4. DSymmetric methods agree keys and authenticate; asymmetric ciphers encrypt all the data
6.Medium

At which OSI layer does a switch normally operate?

  1. APhysical (layer 1)
  2. BNetwork (layer 3)
  3. CData link (layer 2)
  4. DTransport (layer 4)
7.Hard

With sliding-window protocols, how does Go-Back-N differ from Selective Repeat after one frame is lost?

  1. ANeither ever resends lost frames
  2. BGo-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one
  3. CBoth resend the whole window from the start
  4. DGo-Back-N resends only the lost frame; Selective Repeat resends that frame and all later ones
8.Hard

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

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

Answer key

  1. 1. D · SMTP
  2. 2. D · A wide area network (WAN)
  3. 3. C · IEEE 802.3
  4. 4. C · 0–1023
  5. 5. B · Asymmetric methods agree keys and authenticate; symmetric ciphers encrypt the data
  6. 6. C · Data link (layer 2)
  7. 7. B · Go-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one
  8. 8. B · To avoid confusion with old segments and make spoofed segments harder to inject

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