A network engineer performed a migration to a new mail server. The engineer changed the MX record, verified the change was accurate, and confirmed the new mail server was reachable via the IP address in the A record. However, users are not receiving email. Which of the following should the engineer have done to prevent the issue from occurring?

• A.Change the email client configuration to match the MX record.
• B.Reduce the TTL record prior to the MX record change.
• C.Perform a DNS zone transfer prior to the MX record change.
• D.Update the NS record to reflect the IP address change.

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A technician needs to identify a computer on the network that is reportedly downloading unauthorized content. Which of the following should the technician use?

• A.Anomaly alerts
• B.Port mirroring
• C.Performance monitoring
• D.Packet capture

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A network engineer needs to add a boundary network to isolate and separate the internal network from the public-facing internet. Which of the following security defense solutions would best accomplish this task?

• A.Trusted zones
• B.URL filtering
• C.ACLs
• D.Screened subnet

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A junior network technician at a large company needs to create networks from a Class C address with 14 hosts per subnet. Which of the following numbers of host bits is required?

• A.Three
• B.One
• C.Two
• D.Four

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A network administrator is connecting two Layer 2 switches in a network. These switches must transfer data in multiple networks. Which of the following would fulfill this requirement?

• A.Jumbo frames
• B.802.1Q tagging
• C.Native VLAN
• D.Link aggregation

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