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. ASNMP
  2. BSMTP
  3. CIMAP
  4. DPOP3
2.Easy

Which protocol gives secure, encrypted remote login to another computer?

  1. ASNMP
  2. BSSH
  3. CFTP
  4. DTelnet
3.Easy

Which OSI layer transmits raw bits as electrical, optical or radio signals?

  1. APhysical layer
  2. BNetwork layer
  3. CSession layer
  4. DData link layer
4.Medium

What is a cyclic redundancy check (CRC) used for in Ethernet frames?

  1. AEncrypting the frame
  2. BChoosing the best route
  3. CDetecting transmission errors
  4. DCorrecting every bit error automatically
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 server had an internal error
  4. DThe client must log in first
6.Medium

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

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

A remote-terminal application feels sluggish because small keystroke packets are held back. Which TCP mechanism is often responsible?

  1. AThe three-way handshake
  2. BFast retransmit
  3. CSlow start
  4. DNagle's algorithm
8.Hard

The count-to-infinity problem occurs in which kind of routing protocol, and what helps against it?

  1. AStatic routing; adding default routes
  2. BPath-vector; longer AS paths
  3. CLink-state; flooding link updates
  4. DDistance-vector; split horizon and poison reverse

Answer key

  1. 1. B · SMTP
  2. 2. B · SSH
  3. 3. A · Physical layer
  4. 4. C · Detecting transmission errors
  5. 5. A · The requested resource was not found
  6. 6. D · GET retrieves a resource, POST submits data in the request body
  7. 7. D · Nagle's algorithm
  8. 8. D · Distance-vector; split horizon and poison reverse

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