ACMT Networking & Connectivity

Question 1

A customer's MacBook cannot connect to Wi-Fi after a logic board replacement. What should the technician check first?

Accepted Answer

Verify the Wi-Fi antenna cables are reconnected to the AirPort card on the logic board

Answer

Reinstall macOS

Answer

Check the router settings

Answer

Reset the customer's Apple ID

Question 2

Which tool in macOS provides detailed diagnostic information about Wi-Fi signal strength, noise, and channel?

Accepted Answer

Wireless Diagnostics (Option + click Wi-Fi menu icon)

Answer

System Settings > Wi-Fi

Answer

Network Utility

Answer

Activity Monitor

Question 3

A Mac is connected via Ethernet but cannot reach the internet. The network shows 'Self-Assigned IP.' What does this indicate?

Accepted Answer

The Mac failed to obtain an IP address from the DHCP server, so it assigned itself a 169.254.x.x address

Answer

The Ethernet cable is too long

Answer

Wi-Fi is interfering with Ethernet

Answer

The Mac's firewall is blocking traffic

Question 4

Which command-line tool in macOS Terminal tests basic network connectivity by sending ICMP echo requests?

Accepted Answer

ping

Answer

traceroute

Answer

netstat

Answer

nslookup

Question 5

A MacBook Pro with Thunderbolt 3 does not recognize a connected Thunderbolt 3 external drive. What should the technician try first?

Accepted Answer

Try a different Thunderbolt 3 cable and a different Thunderbolt port on the Mac

Answer

Replace the logic board

Answer

Reset NVRAM

Answer

Reinstall macOS

Question 6

What is the purpose of the 'Renew DHCP Lease' button in System Settings > Network?

Accepted Answer

It requests a new IP address from the DHCP server, resolving IP conflicts or expired lease issues

Answer

It resets the Wi-Fi password

Answer

It disconnects and reconnects the Wi-Fi

Answer

It flushes the DNS cache