ICND1 Infrastructure Services 2

Question 1

Which DHCP message does a client send to request an IP address from a specific DHCP server after receiving multiple offers?

Accepted Answer

DHCPREQUEST

Answer

DHCPREQUEST is broadcast by the client to select one server's offer and inform all other servers their offers were declined.

Question 2

What is the default lease time for DHCP addresses on a Cisco IOS router?

Accepted Answer

1 day

Answer

Cisco IOS DHCP server defaults to a 1-day (86400 seconds) lease time unless configured otherwise.

Question 3

A router needs to forward DHCP broadcasts from clients on one subnet to a DHCP server on another subnet. Which command enables this?

Accepted Answer

ip helper-address

Answer

The 'ip helper-address' command on the client-facing interface forwards DHCP broadcasts as unicast to the specified DHCP server.

Question 4

Which DNS record type maps an IPv4 hostname to an IP address?

Accepted Answer

A

Answer

An 'A' record maps a fully qualified domain name (FQDN) to an IPv4 address.

Question 5

What well-known UDP port does NTP use?

Accepted Answer

123

Answer

NTP operates on UDP port 123 to synchronize time between network devices.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test