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

Which device forwards packets between different networks based on IP addresses?

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

Which application protocol is used to request web pages from a web server?

  1. ASMTP
  2. BSNMP
  3. CARP
  4. DHTTP
3.Easy

What does DNS do?

  1. ARoutes packets between networks
  2. BTranslates domain names into IP addresses
  3. CAssigns IP addresses to devices automatically
  4. DEncrypts web traffic
4.Medium

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

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

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

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

NAT (network address translation) is mainly used to:

  1. AIncrease the speed of a network cable
  2. BTranslate domain names into IP addresses for devices on a local network
  3. CLet many devices with private addresses share one public IP address
  4. DEncrypt traffic between two sites
7.Hard

By Shannon's theorem, what is the capacity of a 1 MHz channel with a signal-to-noise ratio of 255?

  1. A255 Mbit/s
  2. B8 Mbit/s
  3. C2 Mbit/s
  4. D1 Mbit/s
8.Hard

A firewall blocks all ICMP. Small web requests work, but large downloads over some paths hang. What is the likely cause?

  1. ATLS certificates are sent over ICMP
  2. BPath MTU discovery fails because "fragmentation needed" messages are blocked
  3. CDNS needs ICMP to resolve names
  4. DTCP cannot open connections without ICMP

Answer key

  1. 1. C · A router
  2. 2. D · HTTP
  3. 3. B · Translates domain names into IP addresses
  4. 4. A · Many compromised machines flood a target with traffic
  5. 5. A · The requested resource was not found
  6. 6. C · Let many devices with private addresses share one public IP address
  7. 7. B · 8 Mbit/s
  8. 8. B · Path MTU discovery fails because "fragmentation needed" messages are blocked

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