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

What is the name of the data unit at the data link layer?

  1. ASegment
  2. BPacket
  3. CMessage
  4. DFrame
3.Easy

In the URL https://www.example.com/index.html, which part is the host name?

  1. Ahttps
  2. Bindex.html
  3. Cwww.example.com
  4. Dexample.com/index.html
4.Medium

At which OSI layer does a switch normally operate?

  1. ANetwork (layer 3)
  2. BTransport (layer 4)
  3. CPhysical (layer 1)
  4. DData link (layer 2)
5.Medium

Why is UDP often preferred for live video calls?

  1. AUDP guarantees every packet arrives, so the picture never freezes
  2. BLow delay matters more than retransmitting every lost packet
  3. CUDP is required for all video
  4. DUDP encrypts data automatically
6.Medium

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

  1. ACSMA/CA
  2. BToken passing
  3. CTDMA
  4. DCSMA/CD
7.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 0.5 Mbit/s
  2. BAbout 50 Mbit/s
  3. CAbout 640 Mbit/s
  4. DAbout 5 Mbit/s
8.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 making A and C use collision detection so they stop sending when frames overlap
  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 increasing the TTL of the frames

Answer key

  1. 1. A · The rate at which data is actually delivered successfully
  2. 2. D · Frame
  3. 3. C · www.example.com
  4. 4. D · Data link (layer 2)
  5. 5. B · Low delay matters more than retransmitting every lost packet
  6. 6. D · CSMA/CD
  7. 7. D · About 5 Mbit/s
  8. 8. C · Optional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait

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