Before upgrading the firmware on several routers, a technician must verify the firmware file received is the same one the vendor provided. Which of the following should the technician use?

A company wants to implement a wireless infrastructure on its campus to meet the needs of its BYOD initiative.
The company has users with legacy devices and wants to accommodate them while delivering speed to other users who have modern systems.
Which of the following standards BEST fits these requirements?

A user in the marketing department reports the email server is down. The user has not received email for more than 24 hours. Which of the following should the network technician do to investigate this issue?

Jeff, a network engineer, is troubleshooting an issue where clients are not receiving IP addresses from a new, properly configured DHCP server on another subnet. Statically addressed clients can get onto the same network with no issues. Which of the following is causing the issue?

Zach, a technician, suspects a duplicate IP address assignment on the network. Which of the following resources can be used to verify this problem?