12.4.7 Check Your Understanding – Symptoms and Causes of Network Problems Answers

1. Which OSI layer are you troubleshooting when the cause of network transmission errors is due to late collisions, short frames, and jabber?

  • Application
  • Data link
  • Network
  • Physical
  • Transport

Explanation: You are troubleshooting the physical layer (i.e., OSI Layer 1) to find the cause of network transmission errors due to late collisions, short frames, and jabber.

2. Which OSI layer are you troubleshooting when investigating a spanning-tree loop?

  • Application
  • Data link
  • Network
  • Physical
  • Transport

Explanation: You are troubleshooting the data link layer (I.e., OSI Layer 2) when troubleshooting a spanning-tree loop problem.

3. Which OSI layer are you troubleshooting when investigating a routing protocol loop?

  • Application
  • Data link
  • Network
  • Physical
  • Transport

Explanation: You are troubleshooting the network layer (i.e., OSI Layer 3) when investigating a routing protocol loop.

4. Which OSI layer are you troubleshooting when investigating an extended ACL related problem?

  • Application
  • Data link
  • Network
  • Physical
  • Transport

Explanation: You are troubleshooting the transport layer (i.e., OSI Layer 4) when investigating an ACL problem.

5. Which OSI layer are you troubleshooting when investigating a DNS related problem?

  • Application
  • Data link
  • Network
  • Physical
  • Transport

Explanation: You are troubleshooting the application layer (i.e., OSI Layer 7) when investigating a DNS problem.

6. Which IOS command can be used to test if other network protocols are working?

  • ping
  • ssh
  • telnet
  • traceroute

Explanation: You can use the Telnet command to test other network protocols.

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