Microsoft Networking Essentials Exam Network Security & Troubleshooting 3

Question 1

What is a MAC address flood attack and what network device is it typically directed against?

Accepted Answer

Fills a switch's CAM table with fake MAC addresses, causing it to broadcast like a hub

Answer

A MAC flood attack overwhelms a switch's CAM (Content Addressable Memory) table with thousands of fake MAC addresses, causing the switch to fail open and broadcast all traffic like a hub.

Question 2

Which command would you use to flush the DNS resolver cache on a Windows computer?

Accepted Answer

ipconfig /flushdns

Answer

The 'ipconfig /flushdns' command clears the DNS resolver cache on Windows, which can resolve issues caused by outdated or incorrect DNS entries.

Question 3

What is the purpose of an IDS (Intrusion Detection System) in network security?

Accepted Answer

Monitors network traffic and alerts administrators to potential security threats

Answer

An IDS monitors network traffic for suspicious activity and known attack signatures, generating alerts for administrators but not automatically blocking traffic (unlike an IPS).

Question 4

A computer receives an IP address starting with 169.254.x.x. What does this indicate?

Accepted Answer

The computer failed to receive an IP address from a DHCP server and self-assigned an APIPA address

Answer

A 169.254.x.x address is an APIPA (Automatic Private IP Addressing) address, which Windows automatically assigns when a DHCP server cannot be reached, indicating a DHCP connectivity problem.

Question 5

Which troubleshooting approach starts from the Physical layer and works up through the OSI model?

Accepted Answer

Bottom-up approach

Answer

The bottom-up troubleshooting approach starts at Layer 1 (Physical) and systematically works up through each OSI layer, checking physical connectivity before moving to higher-layer issues.

Microsoft Networking Essentials Exam Practice Test

Microsoft Networking Essentials Exam Practice Test

Microsoft Networking Essentials Exam Network Security & Troubleshooting 3