QoS operates at which of the following OSI model layers? (Select TWO)

Routing prefixes which are assigned in blocks by IANA and distributed by the Regional Internet Registry (RIR) are known as which of the following?

A T1 line has lost connectivity to the ISP. The ISP has instructed the technician to place a loopback on a device connecting the T1 line to their central office.
On which of the following devices will the technician implement the loopback?

Which of the following applies to data as it travels from Layer 1 to Layer 7 of the OSI model?

A company owns four kiosks that are in close proximity within a shopping center. The owner is concerned about someone accessing the internet via the kiosk’s wireless network.
Which of the following should be implemented to provide wireless access only to the employees working at the kiosk?

Users connecting to an SSID appear to be unable to authenticate to the captive portal.
Which of the following is the cause of this issue?

Which of the following should be used to ensure a specific device always receives the same IP address?

Which of the following ports should be allowed to provide access to certain VoIP applications?

An area to which access is controlled by retina scan is protected by which of the following security measure types?

While troubleshooting, a technician notices that some clients using FTP still work and that pings to the local router and servers are working. The technician tries to ping all known nodes on the network and they reply positively, except for one of the servers. The technician notices that ping works only when the host name is used but not when FQDN is used.
Which of the following servers is MOST likely down?