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 device forwards packets between different networks based on IP addresses?

  1. AA switch
  2. BA router
  3. CA repeater
  4. DA hub
2.Easy

Which IEEE standard family defines Wi-Fi wireless LANs?

  1. AIEEE 802.3
  2. BIEEE 802.1Q
  3. CIEEE 802.15
  4. DIEEE 802.11
3.Easy

What is the main job of a firewall?

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

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

  1. A0–65535
  2. B0–1023
  3. C1024–49151
  4. D49152–65535
5.Medium

A browser receives HTTP status code 404. What does it mean?

  1. AThe client must log in first
  2. BThe server had an internal error
  3. CThe requested resource was not found
  4. DThe request succeeded
6.Medium

What is the main difference between the HTTP methods GET and POST?

  1. AGET deletes a resource, POST reads it from the server's database
  2. BGET is encrypted, POST is not
  3. CGET uses UDP, POST uses TCP
  4. DGET retrieves a resource, POST submits data in the request body
7.Hard

Stations A and C both reach access point B but cannot hear each other, so their frames collide at B. How does 802.11 help?

  1. ABy increasing the TTL of the frames
  2. BBy routing A's frames through C
  3. COptional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait
  4. DBy making A and C use collision detection so they stop sending when frames overlap
8.Hard

A TCP connection has a 64 KB window and a 100 ms round-trip time, and no window scaling. What is its approximate maximum throughput?

  1. AAbout 50 Mbit/s
  2. BAbout 5 Mbit/s
  3. CAbout 640 Mbit/s
  4. DAbout 0.5 Mbit/s

Answer key

  1. 1. B · A router
  2. 2. D · IEEE 802.11
  3. 3. A · To allow or block traffic according to security rules
  4. 4. B · 0–1023
  5. 5. C · The requested resource was not found
  6. 6. D · GET retrieves a resource, POST submits data in the request body
  7. 7. C · Optional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait
  8. 8. B · About 5 Mbit/s

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